Multi-parameter control device and method for reduced indigo dye liquor

Abstract

The invention discloses a multi-parameter control device and method for a reduction-state indigo dye liquor. The device comprises a dye liquor acquisition module, a control module and a control module, wherein the dye liquor acquisition module is used for acquiring a dye liquor sample of the reduction-state indigo dye liquor; the dilution oxidation module is used for converting the reduced indigo blue in the dye liquor sample into the oxidized indigo blue in the dye liquor sample; the titration analysis module is used for automatically judging a titration end point and calculating the concentration of sodium hydrosulfite; automatically judging a titration end point by combining a multi-wavelength spectrophotometry, and calculating the concentration of sodium hydroxide; the optical detection module is integrated with a fixed wavelength light source and an absorbance sensor and is used for detecting the absorbance of the oxidized dye liquor sample and calculating the concentration of indigo through a preset standard curve; the integrated probe module is used for synchronously detecting the pH value, the oxidation-reduction potential and the salt concentration of the dye liquor in real time; and the central control processing module is used for generating a control instruction and controlling the mother liquor added with the reduction-state indigo dye liquor, the sodium hydroxide solution and the sodium hydrosulfite. The method is used for improving the efficiency and the control precision of stability regulation and control of the reduction-state indigo dye liquor.

Description

Technical Field

[0001] This invention relates to the fields of indigo dyeing technology and instrument detection technology, and particularly to a multi-parameter control device and method for reduced indigo dye solution. Background Technology

[0002] This section is intended to provide background or context for the embodiments of the invention described herein. The description herein is not an admission that it is prior art simply because it is included in this section.

[0003] In the field of indigo dyeing, traditional detection methods have significant drawbacks. Existing technologies typically rely on manual operation of multiple single instruments to detect various parameters of the reduced indigo dye liquor. For example, a standard curve is manually created using a spectrophotometer to determine the indigo concentration, the concentration of sodium hydrosulfite is detected by manual titration using the iodometric method, and the concentration of sodium hydroxide is determined by manual acid-base titration. Although pH, ​​redox potential, and salt concentration can be detected by probes, manual intervention is still required. This makes the entire detection process cumbersome, time-consuming, prone to errors, and lacks real-time performance. It cannot meet the automation and intelligentization requirements of dyeing and printing production lines, and it is particularly difficult to achieve one-stop integrated control of multiple parameters, resulting in inaccurate control, low efficiency, and high labor costs. Summary of the Invention

[0004] This invention provides a multi-parameter control device for reduced indigo dye liquor, used to improve the efficiency and control accuracy of stability regulation of reduced indigo dye liquor. The device includes:

[0005] The dye liquor acquisition module is used to automatically acquire dye liquor samples of reduced indigo dye liquor via a sampling pump;

[0006] The dilution oxidation module is connected to the dye liquor collection module and is used to dilute the sample with pure water of a preset oxygen concentration to convert the reduced indigo in the dye liquor sample into the oxidized state.

[0007] The titration analysis module is used to automatically determine the titration endpoint and calculate the sodium hydrosulfite concentration by diluting the sample with pure water containing saturated dissolved oxygen, based on iodometric titration combined with multi-wavelength spectrophotometry; and to automatically determine the titration endpoint and calculate the sodium hydroxide concentration by standardizing the potassium hydrogen phthalate using a combination of phthalotropic titration and multi-wavelength spectrophotometry.

[0008] The optical detection module integrates a fixed wavelength light source and an absorbance sensor to detect the absorbance of the oxidized dye solution sample and calculate the indigo concentration using a preset standard curve.

[0009] An integrated probe module, including a pH probe, an ORP probe, and a conductivity probe, is used to simultaneously and in real-time detect the pH value, redox potential, and salt concentration of the dye solution.

[0010] The central control processing module is used to generate control commands based on the concentration of indigo, sodium hydrosulfite, sodium hydroxide, pH value, redox potential, and salt concentration; and to add the mother liquor of reduced indigo dyeing solution, sodium hydroxide solution, and sodium hydrosulfite based on the control commands.

[0011] This invention also provides a multi-parameter control method for reduced indigo dye liquor, applied to the aforementioned multi-parameter control device for reduced indigo dye liquor, to improve the efficiency and control accuracy of stability regulation of reduced indigo dye liquor. The method includes:

[0012] The dye liquor acquisition module automatically acquires dye liquor samples of reduced indigo dye liquor via a sampling pump;

[0013] The dilution oxidation module dilutes the sample with pure water of a preset oxygen concentration, converting the reduced indigo in the dye sample into the oxidized state.

[0014] The titration analysis module dilutes the sample with pure water containing saturated dissolved oxygen, automatically determines the titration endpoint based on iodometric titration combined with multi-wavelength spectrophotometry, and calculates the sodium hydrosulfite concentration; it also automatically determines the titration endpoint and calculates the sodium hydroxide concentration using potassium hydrogen phthalate standardization combined with multi-wavelength spectrophotometry.

[0015] The optical detection module detects the absorbance of the oxidized dye solution sample and calculates the indigo concentration using a preset standard curve.

[0016] The integrated probe module synchronously and in real time detects the pH value, redox potential, and salt concentration of the dye solution;

[0017] The central control processing module generates control commands based on the concentrations of indigo, sodium hydrosulfite, sodium hydroxide, pH, redox potential, and salt concentration; and adds the mother liquor of reduced indigo dye, sodium hydroxide solution, and sodium hydrosulfite based on the control commands.

[0018] In this embodiment of the invention, a dye liquor acquisition module is used to automatically acquire a sample of reduced indigo dye liquor via a sampling pump; a dilution and oxidation module, connected to the dye liquor acquisition module, is used to dilute the sample with pure water containing a preset oxygen concentration, converting the reduced indigo in the dye liquor sample into an oxidized state; a titration analysis module is used to automatically determine the titration endpoint and calculate the sodium hydrosulfite concentration based on iodometric titration combined with multi-wavelength spectrophotometry after diluting the sample with pure water containing saturated dissolved oxygen; and to automatically determine the titration endpoint and calculate the sodium hydroxide concentration using potassium hydrogen phthalate calibration combined with multi-wavelength spectrophotometry; and to perform light... The detection module integrates a fixed wavelength light source and an absorbance sensor to detect the absorbance of the oxidized dye solution sample and calculate the indigo concentration using a preset standard curve. The integrated probe module includes a pH probe, an ORP probe, and a conductivity probe for simultaneous real-time detection of the pH value, redox potential, and salt concentration of the dye solution. The central control processing module generates control commands based on the indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential, and salt concentration. Based on these control commands, the mother liquor of the reduced indigo dye solution, sodium hydroxide solution, and sodium hydrosulfite are added. In this embodiment of the invention, the dye liquor acquisition module automatically collects dye liquor samples via a sampling pump; the dilution and oxidation module uses pure water with precisely controlled dissolved oxygen to convert reduced indigo into a detectable oxidized state; the optical detection module automatically detects indigo concentration based on a fixed wavelength light source and a preset standard curve, eliminating errors from manually plotted curves; the titration analysis module integrates multi-wavelength photometric endpoint determination technology to automatically identify titration endpoints when determining sodium hydrosulfite concentration by iodometric titration and sodium hydroxide concentration by potassium hydrogen phthalate calibration, avoiding subjective errors from manual titration; the integrated probe module simultaneously acquires three physical parameters: pH value, redox potential, and salt concentration; and the central control processing module integrates six parameters in real time to control the addition of reduced indigo dye liquor, thereby improving the detection efficiency and accuracy of reduced indigo dye liquor, shortening parameter detection time, realizing integrated detection and control of multiple parameters of reduced indigo dye liquor, reducing detection time, lowering detection costs, and improving the efficiency and control accuracy of stability regulation of reduced indigo dye liquor. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0020] Figure 1 This is a schematic diagram of a multi-parameter control device for reduced indigo dye liquor in an embodiment of the present invention;

[0021] Figure 2This is a specific example diagram of a multi-parameter control device for reduced indigo dye liquor in an embodiment of the present invention;

[0022] Figure 3 This is a flowchart illustrating a multi-parameter control method for reduced indigo dye solution according to an embodiment of the present invention.

[0023] Figure 4 This is a specific example diagram of a multi-parameter control method for reduced indigo dye solution in an embodiment of the present invention;

[0024] Figure 5 This is a specific example diagram of a multi-parameter control method for reduced indigo dye solution in an embodiment of the present invention;

[0025] Figure 6 This is a specific example diagram of a multi-parameter control device for reduced indigo dye liquor in an embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0027] In this document, the term "and / or" merely describes a relationship, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0028] In the description of this specification, the terms "comprising," "including," "having," and "containing" are open-ended terms, meaning that they include but are not limited to. The terms "an embodiment," "a specific embodiment," "some embodiments," and "for example," etc., refer to specific features, structures, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. The order of steps involved in the various embodiments is used to illustrate the implementation of this application, and the order of steps is not limited and can be adjusted appropriately as needed.

[0029] The acquisition, storage, use, and processing of data in this application comply with relevant regulations. The information collected in this application is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure, and application of related data all comply with relevant standards, necessary confidentiality measures have been taken, and they do not violate public order and good morals. Corresponding operation interfaces are provided for users to choose to authorize or refuse.

[0030] It should be noted that in the embodiments of this application, certain existing solutions in the industry, such as software, components, and models, may be mentioned. For example, some existing software tools, components, algorithm models, or solutions well-known in other technical fields may be cited. These should be considered exemplary, and their purpose is only to illustrate the feasibility of implementing the technical solution of this application. These mentions should be understood as typical examples, and their core purpose is to illustrate and verify the rationality and feasibility of implementing the technical solution proposed in this application. However, this does not mean that the applicant has already used or necessarily used the solution. Such citations do not imply that the applicant has actually adopted these existing solutions, or that it will necessarily adopt these methods in its technical implementation process in the future. In other words, these mentions are only illustrative in nature, helping to understand the connection and transcendence of the innovation points of this application with the prior art, and do not constitute an endorsement or reliance statement on a specific prior art product.

[0031] Indigo pigments are widely used in the food, pharmaceutical, and dyeing industries. For example, in the dyeing industry, vat indigo is commonly used in the dyeing and production of denim. During indigo dyeing, because indigo is a natural hydrophobic dye, it cannot be directly used to dye yarn and fabric; it needs to be reduced to a vat indigo solution before it can be used for dyeing. The reduction process essentially involves a chemical modification that converts the two carbonyl groups (C=O) in the molecule into hydroxyl groups (C-OH). This reaction needs to be carried out in a strongly alkaline medium (pH>12) using sodium dithionite (Na2S2O4, commonly known as sodium hydrosulfite) as a reducing agent, affecting the conjugated double bond system of the indigo molecule through an electron transfer mechanism. Therefore, during indigo dyeing, it is necessary to strictly control various parameters in the indigo solution, including the concentration of indigo, sodium hydrosulfite, NaOH, pH value, redox potential, and salt concentration.

[0032] Currently, parameter detection in reduced indigo solution and indigo dyeing processes mostly requires manual sampling and testing of individual parameters using separate instruments. For example, indigo concentration detection requires a spectrophotometer, first establishing an indigo absorbance standard curve, then diluting the solution to measure absorbance for each test, and finally substituting the absorbance into the standard curve to determine the indigo concentration. This process is cumbersome and prone to errors. Similarly, the chemical titration method for sodium hydrosulfite concentration is also cumbersome and error-prone, as is the manual acid-base titration method for NaOH concentration. While instruments for pH, redox potential, and salt concentration are relatively advanced and widely available, they still require manual testing, resulting in low automation. In short, current instruments for detecting parameters in reduced indigo solution and indigo dyeing processes are limited in function, all require manual operation, and are cumbersome, error-prone, time-consuming, and labor-intensive, failing to meet the growing demand for automation and intelligentization in the printing and dyeing industry.

[0033] To address the aforementioned problems, this invention provides a multi-parameter control device for reduced indigo dye liquor. This invention not only solves the problem of automatic detection of multiple parameters in reduced indigo solution and during indigo dyeing, but also automatically detects and intelligently integrates six key control factors in the reduced indigo solution (indigo concentration, sodium hydrosulfite concentration, NaOH concentration, pH value, redox potential, and salt concentration). This facilitates the automated control and industrial upgrading of indigo dyeing and printing. Compared to existing single-parameter detection instruments and manual detection methods, it offers a series of advantages, including time and labor savings, high detection accuracy, and compatibility with automated dyeing and printing control systems. This invention provides a multi-parameter control device for reduced indigo dye liquor to improve the efficiency and control accuracy of stability regulation of reduced indigo dye liquor. See [link to relevant documentation]. Figure 1 The device may include:

[0034] The dye liquor acquisition module 101 is used to automatically acquire dye liquor samples of reduced indigo dye liquor through a sampling pump;

[0035] The dilution oxidation module 102 is connected to the dye liquor collection module and is used to dilute the sample with pure water of a preset oxygen concentration to convert the reduced indigo in the dye liquor sample into the oxidized state.

[0036] The titration analysis module 103 is used to automatically determine the titration endpoint and calculate the sodium hydrosulfite concentration by diluting the sample with pure water containing saturated dissolved oxygen and using iodometric titration combined with multi-wavelength spectrophotometry; and to automatically determine the titration endpoint and calculate the sodium hydroxide concentration by using potassium hydrogen phthalate standardization combined with multi-wavelength spectrophotometry.

[0037] The optical detection module 104 integrates a fixed wavelength light source and an absorbance sensor to detect the absorbance of the oxidized dye solution sample and calculate the indigo concentration through a preset standard curve.

[0038] The integrated probe module 105 includes a pH probe, an ORP probe, and a conductivity probe, which are used to simultaneously and in real time detect the pH value, redox potential, and salt concentration of the dye solution.

[0039] The central control processing module 106 is used to generate control commands based on the concentration of indigo, sodium hydrosulfite, sodium hydroxide, pH value, redox potential, and salt concentration; and to add the mother liquor of reduced indigo dyeing solution, sodium hydroxide solution, and sodium hydrosulfite based on the control commands.

[0040] In this embodiment of the invention, a dye liquor acquisition module is used to automatically acquire a sample of reduced indigo dye liquor via a sampling pump; a dilution and oxidation module, connected to the dye liquor acquisition module, is used to dilute the sample with pure water containing a preset oxygen concentration, converting the reduced indigo in the dye liquor sample into an oxidized state; a titration analysis module is used to automatically determine the titration endpoint and calculate the sodium hydrosulfite concentration based on iodometric titration combined with multi-wavelength spectrophotometry after diluting the sample with pure water containing saturated dissolved oxygen; and to automatically determine the titration endpoint and calculate the sodium hydroxide concentration using potassium hydrogen phthalate calibration combined with multi-wavelength spectrophotometry; and to perform light... The detection module integrates a fixed wavelength light source and an absorbance sensor to detect the absorbance of the oxidized dye solution sample and calculate the indigo concentration using a preset standard curve. The integrated probe module includes a pH probe, an ORP probe, and a conductivity probe for simultaneous real-time detection of the pH value, redox potential, and salt concentration of the dye solution. The central control processing module generates control commands based on the indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential, and salt concentration. Based on these control commands, the mother liquor of the reduced indigo dye solution, sodium hydroxide solution, and sodium hydrosulfite are added. In this embodiment of the invention, the dye liquor acquisition module automatically collects dye liquor samples via a sampling pump; the dilution and oxidation module uses pure water with precisely controlled dissolved oxygen to convert reduced indigo into a detectable oxidized state; the titration analysis module integrates multi-wavelength spectrophotometric endpoint determination technology to automatically identify the titration endpoint when determining the concentration of sodium hydrosulfite by iodometric titration and sodium hydroxide by potassium hydrogen phthalate calibration, avoiding subjective errors in manual titration; the optical detection module automatically detects indigo concentration based on a fixed wavelength light source and a preset standard curve, eliminating errors from manually plotted curves; the integrated probe module simultaneously acquires three physical parameters: pH value, redox potential, and salt concentration; and the central control processing module integrates six parameters in real time to control the addition of reduced indigo dye liquor, thereby improving the detection efficiency and accuracy of reduced indigo dye liquor, shortening the parameter detection time, realizing integrated detection and control of multiple parameters of reduced indigo dye liquor, shortening the detection time, reducing the detection cost, and improving the efficiency and control accuracy of stability regulation of reduced indigo dye liquor.

[0041] In practice, the dye liquor acquisition module is used to automatically acquire dye liquor samples of reduced indigo dye liquor through a sampling pump.

[0042] In this embodiment, the dye solution acquisition module is specifically used for:

[0043] The reduced indigo dye solution is pumped into the detection chamber of the detector; the start and stop of the sampling pump are automatically controlled by the central control processing module.

[0044] Dye samples are extracted periodically according to the preset detection cycle, and the extracted dye samples are transported to the dilution and oxidation module through a closed pipeline.

[0045] In the above embodiments, the dye liquor acquisition module extracts reduced indigo dye liquor from the dyeing system and pumps it into the detection chamber of the detector using a sampling pump. The start and stop of this sampling pump is automatically controlled by the central control module according to a pre-set detection cycle, achieving a timed extraction function. The extracted dye liquor sample is directly transported to the dilution and oxidation module for subsequent processing through a closed pipeline system. The entire transport process is completed in a sealed environment, effectively isolating air contact and ensuring that the dye liquor sample maintains its reduced-state stability during transfer, avoiding premature oxidation that could affect detection accuracy.

[0046] In practice, the dilution oxidation module is connected to the dye liquor collection module and is used to dilute the sample with pure water of a preset oxygen concentration to convert the reduced indigo in the dye liquor sample into the oxidized state.

[0047] In this embodiment, the dilution oxidation module is specifically used for:

[0048] The dye solution sample was received and diluted with pure water with a dissolved oxygen concentration of 8 ppm to convert the reduced indigo into the oxidized dye solution.

[0049] The converted dye solution is then transported to the optical detection module for absorbance detection.

[0050] In the above embodiments, the dilution oxidation module is connected to the dye liquor acquisition module for automated processing of dye liquor samples. It uses pure water with a specific oxygen concentration for dilution, completely converting the reduced indigo in the sample into its oxidized form. This module receives the original dye liquor sample from the acquisition module and introduces pure water with a dissolved oxygen concentration precisely set at eight ppm for dilution and mixing, ensuring that the reduced indigo molecules are fully oxidized during the dilution process to form a stable oxidized dye liquor. The converted oxidized dye liquor is then transported to the downstream optical detection module for subsequent absorbance detection and analysis, ensuring the continuity and automation of the detection process. The entire operation is coordinated by a central control system, achieving seamless sample transfer and state transition, effectively supporting accurate measurement of indigo concentration.

[0051] In practical implementation, the titration analysis module is used to dilute the sample with pure water containing saturated dissolved oxygen, automatically determine the titration endpoint based on iodometric titration combined with multi-wavelength spectrophotometry, and calculate the sodium hydrosulfite concentration; and to automatically determine the titration endpoint based on potassium hydrogen phthalate standardization combined with multi-wavelength spectrophotometry and calculate the sodium hydroxide concentration.

[0052] In one embodiment, the titration analysis module is specifically used for:

[0053] The dye sample was diluted with pure water containing saturated dissolved oxygen.

[0054] The diluted sample was chemically reacted with formaldehyde solution, and after being adjusted to neutral with hydrochloric acid, it was automatically titrated with standard iodine solution using starch solution as an indicator.

[0055] The titration endpoint is automatically determined by real-time monitoring of absorbance changes during the titration process using multi-wavelength photometry and selecting the point of abrupt change in absorbance at a characteristic wavelength.

[0056] The concentration of sodium hydrosulfite is automatically calculated based on the volume of standard iodine solution consumed at the endpoint and the dilution factor, combined with the principle of iodometric titration.

[0057] In the above embodiments, the dilution oxidation module is connected to the dye liquor acquisition module for automated processing of dye liquor samples. It uses pure water with a specific oxygen concentration for dilution, completely converting the reduced indigo in the sample into its oxidized form. This module receives the original dye liquor sample from the acquisition module and introduces pure water with a dissolved oxygen concentration precisely set at 8 ppm for dilution and mixing, ensuring that the reduced indigo molecules are fully oxidized during the dilution process to form a stable oxidized dye liquor. The converted oxidized dye liquor is then transported to the downstream optical detection module for subsequent absorbance detection and analysis, ensuring the continuity and automation of the detection process. The entire operation is coordinated by a central control system, achieving seamless sample transfer and state transition, effectively supporting accurate measurement of indigo concentration.

[0058] In one embodiment, the titration analysis module is specifically used for:

[0059] The dye sample was diluted with pure water containing saturated dissolved oxygen, and an automatic titration was performed using standard hydrochloric acid solution with methyl orange solution as an indicator.

[0060] During the titration process, the optical signal changes of the reaction system are monitored in real time using multi-wavelength photometry, and the titration endpoint is determined by selecting absorbance abrupt change points at several characteristic wavelengths.

[0061] The sodium hydroxide concentration is automatically calculated based on the volume of standard hydrochloric acid solution consumed at the titration endpoint and the dilution factor, combined with the principle of potassium hydrogen phthalate standardization.

[0062] In the above embodiments, the titration analysis module is used to automatically detect the concentration of sodium hydrosulfite. First, the dye sample is diluted with pure water containing saturated dissolved oxygen to ensure that the sample remains stable during the dilution process. The diluted sample reacts chemically with formaldehyde solution to form a reaction mixture. Hydrochloric acid is then added to adjust the environment to neutral, and a starch solution is used as an indicator. Standard iodine solution is introduced for automatic titration to achieve the continuity of the chemical reaction.

[0063] This module employs multi-wavelength spectrophotometry to monitor absorbance changes in real time throughout the titration process. By selecting absorbance data at several characteristic wavelengths, it accurately captures abrupt changes during titration and automatically determines the titration endpoint, avoiding errors caused by manual intervention. After determining the endpoint, it automatically calculates the sodium hydrosulfite concentration based on the iodometric principle, taking into account the volume of standard iodine solution consumed at the titration endpoint and the sample dilution factor. The calculation results are summarized and recorded through a central control system, ensuring the accuracy and automation of the detection process. The entire process is integrated into the instrument, supporting real-time monitoring and control of indigo dye parameters.

[0064] During the operation of the titration analysis module, when the titration reaches the chemical endpoint, a significant color change occurs in the indicator (such as starch solution or methyl orange) within the reaction system. This change is captured in real time by the integrated multi-wavelength optical detection module. By monitoring the abrupt change in absorbance at a characteristic wavelength, the optical detection module automatically identifies the precise time point at which the change occurs. Based on this time point, it extrapolates the volume of standard solution (such as iodine solution or hydrochloric acid) consumed during the titration process. Combining this with the preset dilution factor and stoichiometric relationship, it automatically calculates the actual concentration of sodium hydrosulfite or sodium hydroxide.

[0065] This optical determination mechanism effectively avoids the subjective errors of manual endpoint identification, converting color changes into quantifiable light signal data, thereby achieving high-precision, fully automated reagent metering and concentration feedback. The entire process is integrated into a closed-loop pipeline system, supporting real-time monitoring and dynamic control, significantly improving the reliability and efficiency of titration analysis, and providing key data support for multi-parameter closed-loop control of dye solutions.

[0066] In practice, the optical detection module integrates a fixed wavelength light source and an absorbance sensor to detect the absorbance of the oxidized dye sample and calculate the indigo concentration using a preset standard curve.

[0067] In this embodiment, the optical detection module is specifically used for:

[0068] The absorbance of oxidized indigo was obtained by irradiating the oxidized dye solution sample with a fixed wavelength of 665nm and using an absorbance sensor.

[0069] The indigo concentration is calculated by substituting the real-time absorbance value into a standard curve and multiplying it by the dilution factor. The standard curve is based on a pre-configured gradient of indigo solution samples of known concentrations, which detects the absorbance of indigo solution samples of different concentrations to form a linear relationship curve between absorbance and concentration.

[0070] In the above embodiments, the optical detection module integrates a fixed-wavelength light source and an absorbance sensor to automatically detect the absorbance of the oxidized dye solution sample and calculate the indigo concentration using a preset standard curve. This module uses a fixed-wavelength 665 nm light source to irradiate the diluted and oxidized dye solution sample, and the absorbance sensor acquires the absorbance value of the oxidized indigo in real time. The real-time detected absorbance value is substituted into the preset standard curve and calculated in conjunction with the dilution factor to obtain the indigo concentration. The standard curve is established based on a pre-configured gradient of indigo solution samples with known concentrations; by detecting the absorbance of these gradient samples, a linear relationship curve between absorbance and concentration is formed, ensuring the accuracy of the calculation results.

[0071] In practice, an integrated probe module is used, including a pH probe, an ORP probe, and a conductivity probe, to simultaneously and in real-time detect the pH value, redox potential, and salt concentration of the dye solution.

[0072] In this embodiment, the integrated probe module is specifically used for:

[0073] Dye solution parameters are acquired in real time through physical contact measurement; among them, the pH probe is directly immersed in the dye solution to continuously detect the pH value; the ORP probe measures the redox potential in situ; and the conductivity probe determines the salt concentration based on the conductivity characteristics of the solution.

[0074] The probe detection signals obtained by the pH probe, ORP probe, and conductivity probe are transmitted to the central control processing module through shielded cables.

[0075] In the above embodiments, the integrated probe module includes a pH probe, an ORP probe, and a conductivity probe, used for simultaneous real-time detection of the pH value, redox potential, and salt concentration of the dye solution. This module acquires dye solution parameters in real-time through physical contact measurement; the pH probe is directly immersed in the dye solution to continuously detect the pH value; the ORP probe measures the redox potential in situ; and the conductivity probe determines the salt concentration based on the solution's conductivity characteristics. The probe detection signals are automatically transmitted to the central control system of the multi-parameter detector, enabling real-time aggregation and recording of the parameters. This module, integrated into the detection instrument, ensures that pH value, redox potential, and salt concentration data are automatically read and integrated, supporting continuous and automated operation of multi-parameter detection without manual intervention, thereby improving the efficiency and accuracy of dye solution parameter monitoring. The detection process is coordinated by the central control system, achieving synchronous data processing and anomaly alarm functions, contributing to the overall control of the reduced indigo dye solution.

[0076] In specific implementation, the central control processing module is used to generate control commands based on the concentration of indigo, sodium hydrosulfite, sodium hydroxide, pH value, redox potential, and salt concentration; and to add the mother liquor of reduced indigo dyeing solution, sodium hydroxide solution, and sodium hydrosulfite based on the control commands.

[0077] In this embodiment, the central control processing module receives and integrates indigo concentration data from the optical detection module, sodium hydrosulfite and sodium hydroxide concentration data from the titration analysis module, and pH, redox potential, and salt concentration data synchronously detected by the integrated probe module. These parameters are automatically summarized, structured, and stored to form a standardized test report for easy subsequent querying and analysis. The central control processing module continuously compares the indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH, redox potential, and salt concentration data with their respective preset threshold ranges. When any parameter value exceeds the preset threshold, the module automatically generates an alarm message carrying the specific value exceeding the limit for that parameter. This alarm message is output as a control command to the external dyeing and printing control system.

[0078] Based on the generated control commands, the external system triggers a dye liquor parameter adjustment mechanism. This includes adding mother liquor of reduced indigo dye to optimize the indigo concentration, adding sodium hydroxide solution to adjust alkalinity and pH, and adding sodium hydrosulfite to maintain the effective concentration of the reducing agent. This process achieves closed-loop control of dye liquor parameters, ensuring the stability and consistency of the dyeing process and supporting automated operation of the printing and dyeing production line.

[0079] The output control commands from the central control processing module directly serve the real-time monitoring and optimization of dye liquor quality. Through an automated response mechanism, it reduces manual intervention and improves the efficiency and accuracy of dye liquor parameter adjustments. The application of control commands, combined with historical data storage, provides a traceability basis for process improvement, enhancing the level of intelligence in dye liquor management.

[0080] In one embodiment, the central control processing module is further configured to:

[0081] It can receive and process data on indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential and salt concentration in real time;

[0082] The received data is stored in a structured manner to generate a formatted report containing timestamps and detection values.

[0083] In the above embodiments, the central control processing module automatically summarizes and processes six key parameters of the reduced indigo dye solution, including indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential, and salt concentration, and generates a complete test report. This module receives test data in real time from the optical detection module, titration analysis module, and integrated probe module, ensuring that all parameters are collected and processed synchronously. During data processing, the module automatically stores the received data in a structured format, organizing it into a searchable database format for easy subsequent querying and analysis. The stored data automatically generates a formatted report, which includes a timestamp to mark the detection time point and a list of corresponding detection value parameters, achieving systematic data recording and output.

[0084] In this embodiment, the central control processing module specifically receives and processes data on indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential, and salt concentration in real time. It integrates the input signals from each module through a built-in algorithm to ensure data consistency and accuracy. The received data is automatically organized into a structured format and stored in the module's memory to prevent data loss or corruption. Based on the stored data, the module generates a formatted report containing precise timestamps identifying each detection moment and the corresponding detection value information, forming a standardized output document. Simultaneously, the module supports setting parameter anomaly alarm functions; when the detection value exceeds a preset threshold, an alarm is automatically triggered to ensure timely monitoring and adjustment of dye solution parameters. All processing results are presented or exported through the central control system interface, achieving full automation of the detection process.

[0085] In one embodiment, the central control processing module is further configured to:

[0086] Continuously compare the data of indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential and salt concentration with the corresponding preset threshold range;

[0087] For each data value, when the data value exceeds the corresponding preset threshold range, an alarm message is generated that indicates that the data value has exceeded the preset threshold range.

[0088] In the above embodiments, the central control processing module is also used to continuously compare the indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential, and salt concentration data with their respective preset threshold ranges to ensure the real-time performance and accuracy of parameter monitoring. During the comparison process, the module automatically scans each detection value. Once any data value is found to exceed its preset threshold range, an alarm message is immediately generated. This alarm message carries details of the specific data value exceeding the threshold, facilitating operators to quickly identify abnormal parameters and take adjustment measures. The alarm message is presented through the central control system interface or integrated into the detection report, supporting automated alarm reminders, effectively preventing dye liquor quality problems caused by parameter deviations, and enhancing the intelligence level of dye liquor control. The entire process is seamlessly integrated into the multi-parameter detection system, realizing closed-loop management from data acquisition to abnormal response.

[0089] The following three specific embodiments illustrate the specific application of the method of the present invention.

[0090] First specific embodiment:

[0091] This embodiment provides an instrument for automatically detecting six main parameters (indigo concentration, sodium hydrosulfite concentration, NaOH concentration, pH value, redox potential, and salt concentration) in reduced indigo solution.

[0092] The specific details of the technical solution adopted in this embodiment are as follows:

[0093] An automated detection method for six key control parameters (indigo concentration, sodium hydrosulfite concentration, NaOH concentration, pH value, redox potential, and salt concentration) in reduced indigo solution is described. The method uses a fixed wavelength (665nm) light source to detect the absorbance after dilution and oxidation, thus determining the indigo concentration. The sodium hydrosulfite content is then determined by automated iodometric titration. The NaOH concentration is further determined by a combination of potassium hydrogen phthalate (KHP) calibration and photometry. The pH value, redox potential, and salt concentration of the indigo solution are automatically detected using pH, ORP, and conductivity probes, respectively. Finally, the six detected parameters are automatically aggregated into a multi-parameter detection instrument control system, achieving automated multi-parameter detection of reduced indigo solution.

[0094] Compared with traditional indigo solution parameter detection technologies, this embodiment can detect the main monitoring parameters of reduced indigo in one stop, improving the real-time performance and intelligence of the detection. It is beneficial for the control of various parameters of reduced indigo, reduces tedious manual sampling and testing, and saves a lot of testing time and labor costs. It can help upgrade the automation and intelligence of indigo dyeing production lines.

[0095] In the embodiment, the concentration of indigo (C) was measured by spectrophotometry. 靛蓝Using a fixed wavelength (665nm) light source, the absorbance of the diluted oxidized solution was measured (redox potential after dilution > -400MV). The absorbance value was then substituted into the absorbance curve and multiplied by the dilution factor through system calculation. The calculation formula is as follows:

[0096] C 靛蓝 = (0.0357 × absorbance value - 0.0007) × dilution factor;

[0097] This allows for the automatic measurement of the indigo concentration in the reduced indigo solution.

[0098] In this embodiment, the concentration of sodium hydrosulfite was measured by iodometric titration. Based on the detection principle of GB1886.46-2015, the method was improved to include automatic sampling, mixing, and titration. A mixture of indigo solution and formaldehyde was chemically reacted, and after adjusting to neutral with hydrochloric acid, starch solution was used as an indicator. Titration was then performed with standard iodine solution. At the titration endpoint, the detection device automatically read the photoelectric signal. Combining the amount of iodine solution used and the dilution factor at the titration endpoint, the concentration of sodium hydrosulfite in the reduced indigo solution (C0.05) was automatically calculated. 保险粉 The algorithm formula is as follows:

[0099] C 保险粉 = (4.353 × V) 碘 ×N 碘 / V 溶液 ) × 100%;

[0100] Among them, V 碘 Indicates the volume (ml) of iodine consumed in the titration; N 碘 V represents the molar concentration of iodine (mol / L); 溶液 This indicates the volume (ml) of the solution to be tested.

[0101] In this embodiment, the NaOH concentration was determined by combining potassium hydrogen phthalate (KHP) standardization with photometry. The equipment automatically sampled and diluted the indigo solution, then titrated it with standard hydrochloric acid solution, using methyl orange solution as an indicator. Upon reaching the titration endpoint, the detection equipment automatically read the photoelectric signal. Based on the amount of hydrochloric acid solution used and the dilution factor at the titration endpoint, the NaOH concentration (C0) in the reduced indigo solution was automatically calculated. 氢氧化钠 The algorithm formula is as follows:

[0102] C 氢氧化钠 =(C 盐酸 ×V 盐酸 / V 溶液 ) × dilution factor;

[0103] Among them, C 盐酸 V represents the molar concentration of hydrochloric acid (mol / L); 盐酸 V represents the volume (ml) of hydrochloric acid consumed in the titration;溶液 This indicates the volume (ml) of the solution to be tested.

[0104] In this embodiment, the pH value, redox potential, and salt concentration of the indigo solution are automatically detected and read using a pH probe, an ORP probe, and a conductivity probe, respectively.

[0105] Finally, all test results are automatically aggregated into the central control system of the multi-parameter detector, and the data is automatically recorded to generate reports. Alarms can be set for abnormal concentrations and parameters, and alarms will be triggered when the set thresholds are exceeded.

[0106] Second specific embodiment:

[0107] Figure 2 This is a specific example diagram of a multi-parameter control device for reduced indigo dye liquor in an embodiment of the present invention, as shown below. Figure 2 As shown in the figure, this embodiment provides a specific structure of a multi-parameter control device for reduced indigo dye liquor, as follows:

[0108] Sample inlet 1: Serves as the dye solution inlet, automatically receiving external reduced indigo dye solution samples to achieve the initial input function.

[0109] Sampling pump 2: Drives the dye solution from the inlet into the detection system, automatically completing the collection and transportation of the dye solution sample.

[0110] Testing Room 3: Provides a temporary storage and pretreatment environment for dye solutions, used for sample storage and initial treatment.

[0111] Real-time parameter detection components: pH, ORP, conductivity detection chamber 4: integrated probe measurement environment, providing a closed space for synchronous detection.

[0112] pH probe 5: Directly immersed in the dye solution to continuously detect pH value, enabling real-time monitoring of strongly alkaline media.

[0113] ORP Probe 6: In-situ measurement of redox potential to monitor the redox state of dye solution.

[0114] Conductivity probe 7: Determines salt concentration based on solution conductivity characteristics to assess the salt level of dye solution.

[0115] Specialized analysis component metering peristaltic pump 8: Precisely controls the delivery volume of reagents (such as pure water containing saturated dissolved oxygen, formaldehyde solution, hydrochloric acid), supporting dilution and titration operations.

[0116] NaOH Analysis Component 9: Dedicated to the automated detection of sodium hydroxide concentration, it determines the endpoint through a combination of potassium hydrogen phthalate calibration and photometry. The document defines "Determination of NaOH Concentration," and this component calculates and outputs the sodium hydroxide concentration value.

[0117] Sodium hydrosulfite analysis component 10: Enables automated detection of sodium hydrosulfite concentration, performs titration based on the iodometric method, and determines the endpoint using multi-wavelength spectrophotometry.

[0118] Indigo Analysis Component 11: Integrates a fixed wavelength light source and absorbance sensor to detect the absorbance of the dye solution after oxidation and calculate the indigo concentration through a preset standard curve.

[0119] Data processing and control component multi-parameter analysis control panel 12: summarizes and processes all detection parameters (indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential, salt concentration) and generates a structured detection report.

[0120] Among them, the sample inlet 1 corresponds to the dye solution acquisition module, which serves as the initial entry point for the dye solution; it enables automated access to the initial entry point for the dye solution, eliminates the manual sampling process, ensures that the input of dye solution samples is uncontaminated and continuous and stable, and improves the reliability of subsequent detection processes.

[0121] Sampling pump 2 corresponds to the dye acquisition module and is responsible for automatically driving the collection of dye samples; it drives the dye to be automatically delivered to the detection system, avoiding flow fluctuations caused by manual operation, ensuring the consistency and real-time nature of sample collection, and supporting unattended continuous detection requirements.

[0122] The detection chamber 3 corresponds to the dilution oxidation module, which is used for sample storage and pretreatment. It provides a temporary storage and pretreatment environment for dye solution, ensuring that the sample state is stable before dilution oxidation, creating controllable conditions for the full conversion of reduced indigo, and reducing state conversion errors.

[0123] The pH, ORP, and conductivity detection chambers have four corresponding integrated probe modules, providing a physical environment for parameter detection. The integrated measurement environment enables in-situ synchronous detection of the three parameters, eliminating the time delay of step-by-step detection and improving the real-time performance and correlation of pH, redox potential, and salt concentration data.

[0124] pH probe 5 corresponds to the integrated probe module, which directly performs pH value measurement; it is directly immersed in the dye solution to continuously measure the pH value, avoiding the volatilization of alkaline media caused by manual sampling, ensuring the monitoring accuracy of strongly alkaline environment (pH>12), and meeting the control requirements of reduction reaction.

[0125] The ORP probe 6 corresponds to an integrated probe module, which detects oxidation-reduction potential in situ; it monitors oxidation-reduction potential in situ, provides real-time feedback on the reduction status of the dye solution, accurately tracks the electron transfer efficiency of sodium hydrosulfite, and ensures the controllability of the reduction reaction process.

[0126] The conductivity probe 7 corresponds to an integrated probe module, which determines salt concentration based on conductivity characteristics. It automatically determines salt concentration based on the conductivity characteristics of the solution without the need for chemical reagents, avoiding errors in salt analysis due to manual detection and improving the long-term stability of salt concentration data.

[0127] The metering peristaltic pump 8 corresponds to the titration analysis module, which precisely controls the delivery of reagents. It precisely controls the delivery volume of reagents (such as oxygen-containing pure water, formaldehyde, and hydrochloric acid), ensuring the consistency of dilution ratio and titration reaction conditions, and reducing the detection error of sodium hydrosulfite and NaOH from the source.

[0128] NaOH analysis component 9 corresponds to the titration analysis module, which is dedicated to the automated detection of sodium hydroxide concentration. By using automated calibration and photometric determination of the endpoint, it eliminates the subjective bias of manual titration endpoint identification, achieves accurate calculation of sodium hydroxide concentration, and ensures the precision of dye solution alkalinity control.

[0129] The sodium hydrosulfite analysis component 10 corresponds to the titration analysis module, which realizes the calculation of sodium hydrosulfite concentration; it integrates iodometric titration and multi-wavelength endpoint determination, avoiding the tediousness of manual titration operation and visual errors, and improving the efficiency and repeatability of sodium hydrosulfite concentration detection.

[0130] The indigo analysis component 11 corresponds to the optical detection module, which integrates a light source and a sensor for absorbance analysis. The coordinated design of the fixed wavelength light source and the absorbance sensor ensures the standardization of the calculation of the oxidized indigo concentration, and the actual detection error is controlled within a small range, thus verifying the reliability of automated detection.

[0131] The multi-parameter analysis control panel 12 corresponds to the central control processing module. This panel aggregates indigo concentration data from the optical detection module, sodium hydrosulfite and sodium hydroxide concentration data from the titration analysis module, and pH, redox potential, and salt concentration data from the integrated probe module, achieving simultaneous integration of six parameters. All detection data is automatically received and structured to ensure consistency and accuracy, facilitating subsequent retrieval and analysis.

[0132] After processing, the test data generates a formatted report containing timestamps and test values. The report content is systematically stored in the built-in memory to prevent data loss or corruption and supports the tracing and querying of historical data. Based on the stored data, the system continuously compares the concentrations of indigo, sodium hydrosulfite, sodium hydroxide, pH, redox potential, and salt concentration with their respective preset threshold ranges. When any parameter exceeds the threshold, an alarm message with the specific value exceeding the limit is automatically generated.

[0133] Alarm information is output as control commands to the external dyeing and printing control system, triggering an automated response mechanism. This mechanism involves adding mother liquor of reduced indigo dye to optimize indigo concentration, adding sodium hydroxide solution to adjust alkalinity and pH, and adding sodium hydrosulfite to maintain the effective concentration of the reducing agent, thereby achieving closed-loop control of dye liquor parameters. This process reduces manual intervention, improves the efficiency and accuracy of dye liquor management, and contributes to the intelligent and stable operation of the dyeing and printing production line. The alarm function, combined with data storage, provides a basis for process optimization and enhances the real-time performance and reliability of dye liquor quality control.

[0134] Third specific embodiment:

[0135] Figure 6 This is a specific example diagram of a multi-parameter control device for reduced indigo dye liquor in an embodiment of the present invention, as shown below. Figure 6 As shown, Figure 6 In the design, the following modules are proposed.

[0136] 1. Indigo detection module (corresponding) Figure 2 Indigo Analysis Component 11):

[0137] The diluted, oxidized dye solution sample is illuminated by a fixed-wavelength light source, and the optical signal of oxidized indigo is acquired using an absorbance sensor. The indigo concentration is automatically calculated based on a preset absorbance-concentration standard curve, eliminating errors from manually plotted curves. The detection results are transmitted to the central control system in real time.

[0138] 2. Sodium hydrosulfite detection module (corresponding) Figure 2 Sodium hydrosulfite analysis component 10):

[0139] An automated iodometric titration method combined with multi-wavelength spectrophotometry is employed: the sample is diluted with pure water containing saturated dissolved oxygen, then reacts chemically with formaldehyde solution. After neutralization with hydrochloric acid, the sample is automatically titrated with standard iodine solution using starch solution as an indicator. Multi-wavelength spectrophotometry monitors absorbance abrupt changes in real time to determine the titration endpoint, and the concentration of sodium hydrosulfite is automatically calculated based on the titration volume.

[0140] 3. Sodium hydroxide concentration detection module (corresponding) Figure 2 NaOH Analysis Component 9):

[0141] Based on the fusion mechanism of potassium hydrogen phthalate calibration and multi-wavelength spectrophotometry: After diluting the sample with pure water containing saturated dissolved oxygen, the sample is automatically titrated with standard hydrochloric acid solution using methyl orange solution as an indicator. Multi-wavelength spectrophotometry captures abrupt changes in the optical signal of the reaction system, automatically identifies the titration endpoint, and calculates the sodium hydroxide concentration.

[0142] 4. ORP / pH / Conductivity Detection Module (corresponding to) Figure 2 pH probe 5, ORP probe 6, conductivity probe 7):

[0143] An integrated three-probe synchronous measurement system is formed:

[0144] The pH probe is directly immersed in the dye solution to continuously detect the pH value of the alkaline medium;

[0145] ORP probe for in-situ measurement of redox potential state;

[0146] A conductivity probe measures salt concentration based on the electrical conductivity properties of a solution.

[0147] Physical contact measurement data is transmitted synchronously in real time via shielded cable.

[0148] As shown below, this third specific embodiment provides an operating instruction for the above-described multi-parameter control device for reduced indigo dye liquor:

[0149] 1. Startup Figure 6 The multi-parameter automatic control device for reduced indigo dye liquor shown can be selected for single detection or timed automatic detection when indigo concentration detection needs to be started.

[0150] 2. Calibration is required when using the device for the first time. Table 1 is a calibration parameter table provided by an embodiment of the present invention. As shown in Table 1, the indigo detection adopts a 5-point linear correlation calibration. First, 5 known step indigo concentration solutions are configured, and then the indigo automatic detection module is used to detect the indigo solutions of these 5 step concentrations respectively. The photometric signal values ​​corresponding to these 5 known indigo concentrations are recorded. For example, the photometric signal value detected for an indigo concentration of 1.066 g / L is 23.124, and the photometric signal value detected for an indigo concentration of 5.814 g / L is 101.339.

[0151] Table 1

[0152]

[0153] Specifically, the calibration parameters involve the initial calibration process for indigo concentration detection, employing a 5-point linear correlation calibration method. This includes 5 calibration points, each corresponding to a known concentration of a stepped indigo standard solution (standard solution concentration) and its detected photometric signal value (raw value). The calibration value (standard solution concentration) represents the pre-configured indigo concentration gradient sample, and the raw value (photometric signal) represents the optical response signal measured by the automatic indigo detection module for these samples. The complete parameter data is as follows: Serial number 1: raw value 4.8934, calibration value 0.1285; Serial number 2: raw value 13.6598, calibration value 0.5300; Serial number 3: raw value 23.1242, calibration value 1.0656; Serial number 4: raw value 41.3178, calibration value 1.6278; Serial number 5: raw value 101.3392, calibration value 5.8137. These data points cover a range of concentrations from low to high. For example, the original value is approximately 23.124 when the calibration value is close to 1.066 g / L, and approximately 101.339 when the calibration value is close to 5.814 g / L, demonstrating the correlation between concentration and signal.

[0154] During calibration, operators need to input five known concentration values ​​and their corresponding measured photoelectric signals into the calibration interface. The system automatically fits these data points to generate a standardized correlation curve between indigo concentration and the photoelectric signal. This curve serves as the basis for subsequent detection, enabling the equipment to accurately calculate the true concentration of indigo solutions with unknown concentrations, thereby eliminating errors from manually plotted curves. Practical application verification shows that the error of detection results based on this calibration is controlled within ±5%, ensuring the reliability and stability of dye solution parameter monitoring. The entire process supports efficient operation of the equipment in single-shot or timed detection modes, improving the level of automation.

[0155] 3. Input the five known indigo concentrations and their corresponding photoelectric signals into the calibration interface to form a photoelectric signal correlation curve for indigo concentration. This allows the device to detect the true concentration of an unknown indigo solution. Table 2 shows a 24-hour automatic monitoring example table provided by this invention.

[0156] Table 2

[0157]

[0158] Among them, (1) Indigo concentration: The detected values ​​fluctuated between 2.027 and 2.349 g / L, with most data concentrated in the range of 2.0-2.3 g / L. For example: the initial value was 2.251 g / L, the highest value was 2.349 g / L (the second record), and the lowest value was 2.027 g / L (the nineteenth record).

[0159] (2) Concentration of sodium hydrosulfite: range of 0.92-1.073 g / L, showing periodic fluctuations. For example, in the first 8 records, the concentration gradually increased from 0.92 g / L to 1.051 g / L, and then dropped back to 0.985 g / L in the later period (the 10th record).

[0160] (3) pH value: stable in the strongly alkaline range of 11.53-12.08. Among the 22 records, 15 records showed a narrow fluctuation of 11.58-11.61, with an outlier of 12.08 at the end (the 23rd record).

[0161] (4) Sodium hydroxide concentration: ranging from 2.321 to 3.283 g / L, showing a weak correlation with sodium hydrosulfite concentration. For example, when the sodium hydrosulfite concentration was 1.029 g / L, the sodium hydroxide concentration showed a peak of 3.283 g / L (7th record).

[0162] (5) Oxidation-reduction potential (ORP): It remained negative throughout the process (-724.875 to -757 mV), which is consistent with the characteristics of reduced dye solution. Among them, -750 mV appeared most frequently (6 times), and the potential at the end increased significantly to -724.875 mV (23rd record).

[0163] (6) Conductivity: The salt concentration measured in the range of 74.5-81.399 mS / cm increased stepwise. The first 19 records showed an increase from 76.268 to 81.399, and then dropped back to 75.899 (the 23rd record).

[0164] 4. Actual measured concentration is displayed with an error of less than ±5%.

[0165] The actual detection concentration of this specific embodiment is well demonstrated, with the error remaining at a low level, supporting reliable monitoring of dye parameters.

[0166] This specific embodiment has the following advantages:

[0167] 1. It realizes a one-stop integrated testing process, covering the entire chain from dye input to data analysis, replacing traditional scattered manual operations, significantly shortening the testing cycle and reducing manpower requirements.

[0168] 2. The automated process effectively avoids human error, such as misjudgment of titration endpoint or uneven sampling, significantly improving the detection accuracy of key parameters such as indigo concentration, sodium hydrosulfite concentration and sodium hydroxide concentration, and ensuring data reliability.

[0169] 3. The collaborative design of the probe and the central control system supports synchronous monitoring of parameters, enabling dynamic adjustment of the dye liquor reduction state, reducing batch-to-batch quality fluctuations, and enhancing process controllability.

[0170] 4. The threshold alarm and data storage functions of the central control module provide historical traceability basis for process optimization, directly support the intelligent upgrade of the dyeing and printing production line, and improve the overall production efficiency and stability.

[0171] Of course, it is understood that there may be other variations of the above detailed process, and all such variations should fall within the protection scope of this invention.

[0172] In this embodiment of the invention, a dye liquor acquisition module is used to automatically acquire a sample of reduced indigo dye liquor via a sampling pump; a dilution and oxidation module, connected to the dye liquor acquisition module, is used to dilute the sample with pure water containing a preset oxygen concentration, converting the reduced indigo in the dye liquor sample into an oxidized state; a titration analysis module is used to automatically determine the titration endpoint and calculate the sodium hydrosulfite concentration based on iodometric titration combined with multi-wavelength spectrophotometry after diluting the sample with pure water containing saturated dissolved oxygen; and to automatically determine the titration endpoint and calculate the sodium hydroxide concentration using potassium hydrogen phthalate calibration combined with multi-wavelength spectrophotometry; and to perform light... The detection module integrates a fixed wavelength light source and an absorbance sensor to detect the absorbance of the oxidized dye solution sample and calculate the indigo concentration using a preset standard curve. The integrated probe module includes a pH probe, an ORP probe, and a conductivity probe for simultaneous real-time detection of the pH value, redox potential, and salt concentration of the dye solution. The central control processing module generates control commands based on the indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential, and salt concentration. Based on these control commands, the mother liquor of the reduced indigo dye solution, sodium hydroxide solution, and sodium hydrosulfite are added. In this embodiment of the invention, the dye liquor acquisition module automatically collects dye liquor samples via a sampling pump; the dilution and oxidation module uses pure water with precisely controlled dissolved oxygen to convert reduced indigo into a detectable oxidized state; the titration analysis module integrates multi-wavelength spectrophotometric endpoint determination technology to automatically identify the titration endpoint when determining the concentration of sodium hydrosulfite by iodometric titration and sodium hydroxide by potassium hydrogen phthalate calibration, avoiding subjective errors in manual titration; the optical detection module automatically detects indigo concentration based on a fixed wavelength light source and a preset standard curve, eliminating errors from manually plotted curves; the integrated probe module simultaneously acquires three physical parameters: pH value, redox potential, and salt concentration; and the central control processing module integrates six parameters in real time to control the addition of reduced indigo dye liquor, thereby improving the detection efficiency and accuracy of reduced indigo dye liquor, shortening the parameter detection time, realizing integrated detection and control of multiple parameters of reduced indigo dye liquor, shortening the detection time, reducing the detection cost, and improving the efficiency and control accuracy of stability regulation of reduced indigo dye liquor.

[0173] As described above, this invention provides an online multi-parameter detection instrument for reduced indigo dyeing solution, belonging to the field of indigo dyeing, specifically for instrument detection. The instrument's detection parameters include indigo concentration, sodium hydrosulfite concentration, NaOH concentration, ORP, pH, and conductivity. For indigo concentration detection, the indigo dyeing solution is pumped into the detection chamber of the multi-parameter detector using a sampling device. After dilution with pure water containing 8 ppm dissolved oxygen, the reduced indigo is converted to its oxidized state. The absorbance is then measured using a fixed wavelength (665 nm) light source, and the indigo concentration is calculated using a standard curve. For sodium hydrosulfite concentration detection, the solution is diluted with pure water containing saturated dissolved oxygen using a sampling device. The sodium hydrosulfite content in the solution is then determined using a photometric method based on iodometric titration. The titration endpoint is determined by measuring absorbance at several characteristic wavelengths, and a titration curve is fitted. NaOH concentration detection involves dilution with pure water saturated with dissolved oxygen using a sampling device. The NaOH concentration is then determined using a combination of potassium hydrogen phthalate (KHP) calibration and photometry. The titration endpoint is determined by measuring absorbance at several characteristic wavelengths, and a titration curve is fitted. A pH probe, ORP probe, and conductivity probe automatically detect the pH, redox potential, and salt concentration of the indigo solution. Finally, these six parameters are automatically aggregated into the multi-parameter analyzer's central control system, achieving automated multi-parameter detection of reduced indigo solutions. Compared to traditional indigo solution parameter detection technologies, this one-stop detection of key parameters improves real-time performance, facilitates parameter control of reduced indigo, reduces tedious manual sampling and testing, and saves significant testing time and labor costs. This can contribute to the automation and intelligent upgrading of indigo dyeing production lines.

[0174] This invention also provides a multi-parameter control method for reduced indigo dye liquor, applied to the aforementioned multi-parameter control device for reduced indigo dye liquor, to improve the efficiency and control accuracy of stability regulation of reduced indigo dye liquor. Figure 3 This is a flowchart illustrating a multi-parameter control method for reduced indigo dye liquor according to an embodiment of the present invention. Figure 3 As shown, the method includes:

[0175] Step 301: The dye liquor acquisition module automatically acquires a sample of reduced indigo dye liquor using a sampling pump;

[0176] Step 302: The dilution oxidation module dilutes the sample with pure water of a preset oxygen concentration to convert the reduced indigo in the dye sample into the oxidized state;

[0177] Step 303: The titration analysis module dilutes the sample with pure water containing saturated dissolved oxygen, automatically determines the titration endpoint based on iodometric titration combined with multi-wavelength spectrophotometry, and calculates the sodium hydrosulfite concentration; it also automatically determines the titration endpoint and calculates the sodium hydroxide concentration using potassium hydrogen phthalate standardization combined with multi-wavelength spectrophotometry.

[0178] Step 304: The optical detection module detects the absorbance of the oxidized dye solution sample and calculates the indigo concentration using a preset standard curve;

[0179] Step 305: The integrated probe module synchronously and in real-time detects the pH value, redox potential, and salt concentration of the dye solution;

[0180] Step 306: The central control processing module generates control instructions based on the indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential, and salt concentration; and adds the mother liquor of reduced indigo dyeing solution, sodium hydroxide solution, and sodium hydrosulfite based on the control instructions.

[0181] In one embodiment, the dye liquor acquisition module automatically acquires a sample of reduced indigo dye liquor via a sampling pump, including:

[0182] The reduced indigo dye solution is pumped into the detection chamber of the detector; the start and stop of the sampling pump are automatically controlled by the central control processing module.

[0183] Dye samples are extracted periodically according to the preset detection cycle, and the extracted dye samples are transported to the dilution and oxidation module through a closed pipeline.

[0184] In one embodiment, the dilution oxidation module dilutes the sample with pure water of a preset oxygen concentration to convert the reduced indigo in the dye sample into an oxidized state, including:

[0185] The dye solution sample was received and diluted with pure water with a dissolved oxygen concentration of 8 ppm to convert the reduced indigo into the oxidized dye solution.

[0186] In one embodiment, the titration analysis module dilutes the sample with pure water containing saturated dissolved oxygen, automatically determines the titration endpoint based on iodometric titration combined with multi-wavelength spectrophotometry, and calculates the sodium hydrosulfite concentration, including:

[0187] The dye sample was diluted with pure water containing saturated dissolved oxygen.

[0188] The diluted sample was chemically reacted with formaldehyde solution, and after being adjusted to neutral with hydrochloric acid, it was automatically titrated with standard iodine solution using starch solution as an indicator.

[0189] The titration endpoint is automatically determined by real-time monitoring of absorbance changes during the titration process using multi-wavelength photometry and selecting the point of abrupt change in absorbance at a characteristic wavelength.

[0190] The concentration of sodium hydrosulfite is automatically calculated based on the volume of standard iodine solution consumed at the endpoint and the dilution factor, combined with the principle of iodometric titration.

[0191] In one embodiment, the titration endpoint is automatically determined by combining potassium hydrogen phthalate standardization with multi-wavelength spectrophotometry, and the sodium hydroxide concentration is calculated, including:

[0192] The dye sample was diluted with pure water containing saturated dissolved oxygen, and an automatic titration was performed using standard hydrochloric acid solution with methyl orange solution as an indicator.

[0193] During the titration process, the optical signal changes of the reaction system are monitored in real time using multi-wavelength photometry, and the titration endpoint is determined by selecting absorbance abrupt change points at several characteristic wavelengths.

[0194] The sodium hydroxide concentration is automatically calculated based on the volume of standard hydrochloric acid solution consumed at the titration endpoint and the dilution factor, combined with the principle of potassium hydrogen phthalate standardization.

[0195] In one embodiment, the optical detection module detects the absorbance of the oxidized dye solution sample and calculates the indigo concentration using a preset standard curve, including:

[0196] The absorbance of oxidized indigo was obtained by irradiating the oxidized dye solution sample with a fixed wavelength of 665nm and using an absorbance sensor.

[0197] The indigo concentration is calculated by substituting the real-time absorbance value into a standard curve and multiplying it by the dilution factor. The standard curve is based on a pre-configured gradient of indigo solution samples of known concentrations, which detects the absorbance of indigo solution samples of different concentrations to form a linear relationship curve between absorbance and concentration.

[0198] In one embodiment, the integrated probe module synchronously and in real-time detects the pH value, redox potential, and salt concentration of the dye solution. Figure 5 This is a specific example diagram of a multi-parameter control method for reduced indigo dye liquor in an embodiment of the present invention, as shown in the figure. Figure 5 As shown, it includes:

[0199] Step 501: Obtain dye solution parameters in real time and synchronously through physical contact measurement; wherein, the pH probe is directly immersed in the dye solution to continuously detect the pH value; the ORP probe measures the redox potential in situ; and the conductivity probe determines the salt concentration based on the conductivity characteristics of the solution.

[0200] Step 502: Transmit the probe detection signals obtained by the pH probe, ORP probe and conductivity probe to the central control processing module through the shielded cable.

[0201] In one embodiment, the central control processing module generates control commands based on the indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential, and salt concentration; and adds the mother liquor of reduced indigo dye solution, sodium hydroxide solution, and sodium hydrosulfite based on the control commands, including:

[0202] It can receive and process data on indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential and salt concentration in real time;

[0203] The received data is stored in a structured manner to generate a formatted report containing timestamps and detection values.

[0204] In one embodiment, Figure 4 This is a specific example diagram of a multi-parameter control method for reduced indigo dye liquor in an embodiment of the present invention, as shown in the figure. Figure 4 As shown, it also includes:

[0205] Step 401: Continuously compare the data of indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential and salt concentration with the corresponding preset threshold range;

[0206] Step 402: For each data value, when the data value exceeds the corresponding preset threshold range, generate an alarm message indicating that the data value exceeds the preset threshold range.

[0207] In this embodiment of the invention, a dye liquor acquisition module is used to automatically acquire a sample of reduced indigo dye liquor via a sampling pump; a dilution and oxidation module, connected to the dye liquor acquisition module, is used to dilute the sample with pure water containing a preset oxygen concentration, converting the reduced indigo in the dye liquor sample into an oxidized state; a titration analysis module is used to automatically determine the titration endpoint and calculate the sodium hydrosulfite concentration based on iodometric titration combined with multi-wavelength spectrophotometry after diluting the sample with pure water containing saturated dissolved oxygen; and to automatically determine the titration endpoint and calculate the sodium hydroxide concentration using potassium hydrogen phthalate calibration combined with multi-wavelength spectrophotometry; and to perform light... The detection module integrates a fixed wavelength light source and an absorbance sensor to detect the absorbance of the oxidized dye solution sample and calculate the indigo concentration using a preset standard curve. The integrated probe module includes a pH probe, an ORP probe, and a conductivity probe for simultaneous real-time detection of the pH value, redox potential, and salt concentration of the dye solution. The central control processing module generates control commands based on the indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential, and salt concentration. Based on these control commands, the mother liquor of the reduced indigo dye solution, sodium hydroxide solution, and sodium hydrosulfite are added. In this embodiment of the invention, the dye liquor acquisition module automatically collects dye liquor samples via a sampling pump; the dilution and oxidation module uses pure water with precisely controlled dissolved oxygen to convert reduced indigo into a detectable oxidized state; the titration analysis module integrates multi-wavelength spectrophotometric endpoint determination technology to automatically identify the titration endpoint when determining the concentration of sodium hydrosulfite by iodometric titration and sodium hydroxide by potassium hydrogen phthalate calibration, avoiding subjective errors in manual titration; the optical detection module automatically detects indigo concentration based on a fixed wavelength light source and a preset standard curve, eliminating errors from manually plotted curves; the integrated probe module simultaneously acquires three physical parameters: pH value, redox potential, and salt concentration; and the central control processing module integrates six parameters in real time to control the addition of reduced indigo dye liquor, thereby improving the detection efficiency and accuracy of reduced indigo dye liquor, shortening the parameter detection time, realizing integrated detection and control of multiple parameters of reduced indigo dye liquor, shortening the detection time, reducing the detection cost, and improving the efficiency and control accuracy of stability regulation of reduced indigo dye liquor.

[0208] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0209] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0210] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0211] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0212] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-parameter control device for reduced indigo dye liquor, characterized in that, include: The dye liquor acquisition module is used to automatically acquire dye liquor samples of reduced indigo dye liquor via a sampling pump; The dilution oxidation module is connected to the dye liquor collection module and is used to dilute the sample with pure water of a preset oxygen concentration to convert the reduced indigo in the dye liquor sample into the oxidized state. The titration analysis module is used to automatically determine the titration endpoint and calculate the sodium hydrosulfite concentration by diluting the sample with pure water containing saturated dissolved oxygen, based on iodometric titration combined with multi-wavelength spectrophotometry; and to automatically determine the titration endpoint and calculate the sodium hydroxide concentration by standardizing the potassium hydrogen phthalate using a combination of phthalotropic titration and multi-wavelength spectrophotometry. The optical detection module integrates a fixed wavelength light source and an absorbance sensor to detect the absorbance of the oxidized dye solution sample and calculate the indigo concentration using a preset standard curve. An integrated probe module, including a pH probe, an ORP probe, and a conductivity probe, is used to simultaneously and in real-time detect the pH value, redox potential, and salt concentration of the dye solution. The central control processing module is used to generate control commands based on the concentration of indigo, sodium hydrosulfite, sodium hydroxide, pH value, redox potential, and salt concentration; and to add the mother liquor of reduced indigo dyeing solution, sodium hydroxide solution, and sodium hydrosulfite based on the control commands.

2. The apparatus as claimed in claim 1, characterized in that, The dye solution acquisition module is specifically used for: The reduced indigo dye solution is pumped into the detection chamber of the detector; the start and stop of the sampling pump are automatically controlled by the central control processing module. Dye samples are extracted periodically according to the preset detection cycle, and the extracted dye samples are transported to the dilution and oxidation module through a closed pipeline.

3. The apparatus as described in claim 1, characterized in that, The dilution oxidation module is specifically used for: The dye solution sample was received and diluted with pure water with a dissolved oxygen concentration of 8 ppm to convert the reduced indigo into the oxidized dye solution.

4. The apparatus as claimed in claim 1, characterized in that, The titration analysis module is specifically used for: The dye sample was diluted with pure water containing saturated dissolved oxygen. The diluted sample was chemically reacted with formaldehyde solution, and after being adjusted to neutral with hydrochloric acid, it was automatically titrated with standard iodine solution using starch solution as an indicator. The titration endpoint is automatically determined by real-time monitoring of absorbance changes during the titration process using multi-wavelength photometry and selecting the point of abrupt change in absorbance at a characteristic wavelength. The concentration of sodium hydrosulfite is automatically calculated based on the volume of standard iodine solution consumed at the endpoint and the dilution factor, combined with the principle of iodometric titration.

5. The apparatus as claimed in claim 1, characterized in that, The titration analysis module is specifically used for: The dye sample was diluted with pure water containing saturated dissolved oxygen, and an automatic titration was performed using standard hydrochloric acid solution with methyl orange solution as an indicator. During the titration process, the optical signal changes of the reaction system are monitored in real time using multi-wavelength photometry, and the titration endpoint is determined by selecting absorbance abrupt change points at several characteristic wavelengths. The sodium hydroxide concentration is automatically calculated based on the volume of standard hydrochloric acid solution consumed at the titration endpoint and the dilution factor, combined with the principle of potassium hydrogen phthalate standardization.

6. The apparatus as claimed in claim 1, characterized in that, The optical detection module is specifically used for: The absorbance of oxidized indigo was obtained by irradiating the oxidized dye solution sample with a fixed wavelength of 665nm and using an absorbance sensor. The indigo concentration is calculated by substituting the real-time absorbance value into a standard curve and multiplying it by the dilution factor. The standard curve is based on a pre-configured gradient of indigo solution samples of known concentrations, which detects the absorbance of indigo solution samples of different concentrations to form a linear relationship curve between absorbance and concentration.

7. The apparatus as claimed in claim 1, characterized in that, Integrated probe module, specifically used for: Dye solution parameters are acquired in real time through physical contact measurement; among them, the pH probe is directly immersed in the dye solution to continuously detect the pH value; the ORP probe measures the redox potential in situ; and the conductivity probe determines the salt concentration based on the conductivity characteristics of the solution. The probe detection signals obtained by the pH probe, ORP probe, and conductivity probe are transmitted to the central control processing module through shielded cables.

8. The apparatus as claimed in claim 1, characterized in that, The central control processing module is also used for: It can receive and process data on indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential and salt concentration in real time; The received data is stored in a structured manner to generate a formatted report containing timestamps and detection values.

9. The apparatus as claimed in claim 1, characterized in that, The central control processing module is also used for: Continuously compare the data of indigo concentration, sodium hydrosulfite concentration, sodium hydroxide concentration, pH value, redox potential and salt concentration with the corresponding preset threshold range; For each data value, when the data value exceeds the corresponding preset threshold range, an alarm message is generated that indicates that the data value has exceeded the preset threshold range.

10. A method for controlling multiple parameters of reduced indigo dye solution, characterized in that, The method, applied to the multi-parameter control device for reduced indigo dye liquor as described in any one of claims 1 to 9, comprises: The dye liquor acquisition module automatically acquires dye liquor samples of reduced indigo dye liquor via a sampling pump; The dilution oxidation module dilutes the sample with pure water of a preset oxygen concentration, converting the reduced indigo in the dye sample into the oxidized state. The titration analysis module dilutes the sample with pure water containing saturated dissolved oxygen, automatically determines the titration endpoint based on iodometric titration combined with multi-wavelength spectrophotometry, and calculates the sodium hydrosulfite concentration; it also automatically determines the titration endpoint and calculates the sodium hydroxide concentration using potassium hydrogen phthalate standardization combined with multi-wavelength spectrophotometry. The optical detection module detects the absorbance of the oxidized dye solution sample and calculates the indigo concentration using a preset standard curve. The integrated probe module synchronously and in real time detects the pH value, redox potential, and salt concentration of the dye solution; The central control processing module generates control commands based on the concentrations of indigo, sodium hydrosulfite, sodium hydroxide, pH, redox potential, and salt concentration; and adds the mother liquor of reduced indigo dye, sodium hydroxide solution, and sodium hydrosulfite based on the control commands.

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