Online esterification rate analysis system
Through the online esterification rate analysis system, the spectrum analyzer and processor are used to detect and calculate the esterification rate in real time, which solves the problems of low analysis frequency, large hysteresis and large errors in traditional methods, and realizes accurate and timely monitoring of the esterification rate, reducing labor costs.
Patent Information
- Application Number
- CN202421788146.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-07-26
AI Technical Summary
In traditional methods, the analysis frequency of the esterification rate is low, there is hysteresis and errors, and it requires a lot of labor costs, making it difficult to control the esterification rate in a timely manner.
An online esterification rate analysis system was designed, which was connected to the reactor through a transparent pipe, and the melt components were detected in real time using a spectral analyzer, the processor calculated the esterification rate, and monitored in real time through the display.
Real-time analysis and calculation of the esterification rate are achieved, which reduces the workload of staff, saves labor costs, avoids the lag and error of traditional methods, and ensures the accuracy of the esterification rate measurement.
Smart Images
Figure CN222965115U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of petrochemical polyester detection, and particularly relates to an on-line esterification rate analysis system. Background Art
[0002] In the petrochemical polyester industry, the content of terminal carboxyl groups (—COOH) is an important index in the process of slice production. The level of its content directly affects the product quality and the direct economic benefits of the enterprise. Polyester production involves polymerization reactions, which are processes that convert low-molecular-weight monomers into high-molecular-weight polymers. Polymers have important properties such as plasticity, fiber-forming, film-forming, and high elasticity that low-molecular-weight monomers do not possess, and can be widely used as plastics, fibers, rubbers, coatings, adhesives, and other applications. This material is composed of more than one structural unit (monomer) and is a high-molecular compound synthesized by repeated reactions of monomers.
[0003] During the polymerization reaction process, controlling the melt esterification rate is the most important and direct means to ensure the content of terminal carboxyl groups (—COOH) in the slices. The esterification rate is a measure of the degree of esterification. In traditional solutions, the esterification rate can usually only be obtained through regular sampling and analysis by laboratory technicians. For example, the laboratory titration method is often used, with an analysis frequency of 1 time per shift (8 hours per shift), and the analysis time requires more than 2 hours, which has a certain lag, and there are errors caused by analysis equipment, human factors, operation, and sampling methods. This makes it easy to cause when the esterification rate data is abnormal, it is impossible to promptly determine whether it is the real data or the analysis error, and it is necessary to take samples and analyze again. In addition, the process of analysis and testing requires personnel to take regular shifts, consuming a large amount of labor costs.
[0004] Currently, there are also some devices for measuring the esterification rate through a bypass, such as Figure 1 As shown, two reactors 6 are connected through a melt main pipe 04. A booster pump 01, a density flow sensor 02, and a relief valve 03 are connected in series to form a bypass branch 05, and this bypass branch 05 is connected in parallel with the melt main pipe 04. When the bypass branch 05 is in use, additional heat preservation measures are required, and a booster pump 01 needs to be set. Moreover, if the gas content in the melt passing through the bypass branch 05 is relatively high, it will affect the measurement data, resulting in large fluctuations in the results. Using this result to guide the production process will make it difficult to control the esterification rate, and ultimately lead to uneven product quality. Content of the Utility Model
[0005] The purpose of the utility model is to provide an on-line esterification rate analysis system, which can analyze and calculate the esterification rate of the melt in real time, ensure the accuracy of the esterification rate, greatly reduce the workload of the staff, and has the characteristics of simple structure and convenient installation.
[0006] To achieve the above object, the present utility model provides an online esterification rate analysis system, which includes:
[0007] A melt pipeline;
[0008] A transparent pipeline, both ends of the transparent pipeline are respectively used to communicate with a reaction kettle through the melt pipeline;
[0009] A processor;
[0010] A spectral analyzer, the spectral analyzer is electrically connected to the processor, the spectral analyzer is used to detect the components of the melt in the transparent pipeline, and transmit the detection result to the processor, and the detection result is used to reflect the esterification rate of the melt.
[0011] Optionally, the transparent pipeline includes a glass pipeline.
[0012] Optionally, the spectral analyzer is an absorption spectrometer.
[0013] Optionally, the absorption spectrometer includes a light source assembly and a detection assembly, the light source assembly is used to irradiate light to the transparent pipeline, the detection assembly is used to receive the light radiated from the transparent pipeline and obtain the detection result, and the detection assembly is electrically connected to the processor.
[0014] Optionally, the light source assembly includes a light source and a grating.
[0015] Optionally, the online esterification rate analysis system includes a display, and the display is connected to the processor.
[0016] Optionally, the processor analyzes and obtains the actual ester content according to the detection result, and the processor calculates the esterification rate according to the theoretical ester content and the actual ester content.
[0017] Optionally, both ends of the transparent pipeline are respectively connected to the melt pipeline through flanges.
[0018] Optionally, the length of the transparent pipeline is 180 mm - 220 mm.
[0019] Optionally, the transparent pipeline and the melt pipeline are integrally formed.
[0020] In summary, the present utility model provides an online esterification rate analysis system, which includes: a melt pipeline; a transparent pipeline, both ends of the transparent pipeline are respectively used to communicate with a reaction kettle through the melt pipeline; a processor; a spectral analyzer, the spectral analyzer is electrically connected to the processor, the spectral analyzer is used to detect the components of the melt in the transparent pipeline, and transmit the detection result to the processor, and the detection result is used to reflect the esterification rate of the melt.
[0021] With the above configuration, the transparent pipe is connected to the melt pipe to receive the melt from the melt pipe. By setting the transparent pipe, the spectrometer can directly detect the melt in the transparent pipe through the transparent pipe, avoiding frequent sampling and analysis of the melt, greatly reducing the workload of the staff, saving labor costs. Moreover, by using the spectrometer combined with the processor to analyze the melt, the esterification rate can be calculated in real time, avoiding the lag and error caused by the traditional sampling measurement method. In addition, the present utility model does not require an additional bypass branch to be connected to the main melt pipe, nor does it affect the flow state of the melt in the main melt pipe, eliminating the influence of the relatively high gas content in the melt of the bypass branch on the measurement data and ensuring the accuracy of the esterification rate measurement. In short, the present utility model can analyze and calculate the esterification rate of the melt in real time, and the accuracy of the esterification rate is guaranteed, greatly reducing the workload of the staff, and having the characteristics of simple structure and convenient installation. Description of the Drawings
[0022] Those of ordinary skill in the art should understand that the provided drawings are used to better understand the present utility model and do not constitute any limitation to the scope of the present utility model. Among them:
[0023] Figure 1 is a schematic diagram of an existing esterification rate measurement device;
[0024] Figure 2 is a schematic diagram of an on-line esterification rate analysis system according to an embodiment of the present utility model.
[0025] Among them, the reference numerals are as follows:
[0026] 01 - booster pump; 02 - density flow sensor; 03 - relief valve; 04 - main melt pipe; 05 - bypass branch; 1 - transparent pipe; 2 - spectrometer; 3 - processor; 4 - melt pipe; 5 - flange; 6 - reaction kettle; 7 - valve. Detailed Embodiments
[0027] In this article, unless otherwise specified, the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "top", "bottom", etc. are used to indicate the orientation or positional relationship based on the drawings, only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation and operation, so it cannot be understood as a limitation to the present utility model.
[0028] The following will describe the specific embodiments of the present utility model in more detail with reference to the schematic diagrams. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the convenience of clearly assisting in explaining the purpose of the embodiments of the present utility model.
[0029] Figure 2 It is a schematic diagram of an online esterification rate analysis system according to an embodiment of the present utility model. Please refer to Figure 2 , an embodiment of the present utility model provides an online esterification rate analysis system, including a melt pipeline, a transparent pipeline 1, a processor 3 and a spectral analyzer 2.
[0030] Both ends of the transparent pipeline 1 are respectively used to communicate with the reaction kettle through the melt pipeline 4. Both ends of the transparent pipeline 1 are communicated with the melt pipeline 4, and the inner diameter of the transparent pipeline 1 is the same as that of the melt pipeline 4. For example, the two reaction kettles 6 are communicated through the melt pipeline 4. A valve 7 for controlling the opening and closing of the pipeline is provided on the melt pipeline 4. A section of the melt pipeline 4 can be replaced with the transparent pipeline 1. Both ends of the transparent pipeline 1 are respectively connected to the melt pipeline 4 through flanges 5. The transparent pipeline 1 can be a glass pipeline, for example. When the transparent pipeline 1 is a glass pipeline, the pipe wall of the glass pipeline needs to have a certain thickness to withstand the passage of the melt. Therefore, the outer diameter of the glass pipeline is usually larger than that of the melt pipeline 4. Further, the length of the transparent pipeline 1 can be 180 mm - 220 mm. For example, the length of the transparent pipeline 1 is 200 mm. In other embodiments, the transparent pipeline 1 can also be integrally formed with the melt pipeline 4, or the entire melt pipeline 4 is the transparent pipeline 1. It can be understood that the transparent pipeline 1 is located in the optical path of the spectral analyzer 2 so that the light emitted by the spectral analyzer 2 can pass through the melt.
[0031] The spectral analyzer 2 is electrically connected to the processor 3. The spectral analyzer 2 is used to detect the components of the melt in the transparent pipeline 1 and transmit the detection results to the processor 3. The processor 3 is used to analyze and calculate the esterification rate of the melt according to the detection results.
[0032] It is understandable that a spectral analyzer is an instrument used to analyze the wavelength and intensity of light, and its working principle is based on the phenomenon of light dispersion. Exemplarily, the spectral analyzer can be an absorption spectrometer, which determines the composition and concentration of a substance by measuring the absorption degree of the substance to light of a specific wavelength. Further, the absorption spectrometer includes a light source assembly and a detection assembly. The light source assembly is used to irradiate light onto the transparent pipe 1, and the detection assembly is used to receive the light transmitted through the transparent pipe 1 and obtain a detection result. The detection assembly is electrically connected to the processor 3. For example, the detection assembly is connected to the processor 3 through a wire. The light source assembly includes a light source and a grating. The detection assembly can include a photodiode or a photomultiplier tube for detecting the received light. The working process of the spectral analyzer 2 is generally as follows: The light source emits a light beam, the light beam is dispersed into light of different wavelengths by the grating, the dispersed light interacts with the melt in the transparent pipe 1, the elements in the melt will emit different rays, these rays are received by the detection assembly, and the detection assembly analyzes the components of the melt to obtain a detection result.
[0033] Further, the processor 3 analyzes the detection result to obtain the actual ester content, and the processor 3 calculates the esterification rate according to the theoretical ester content and the actual ester content. For example, the processor 3 analyzes the content of each component of the melt according to the detection result, divides the actual ester content by the theoretical ester content and multiplies by 100% to obtain the esterification rate, and the theoretical ester content can be calculated by the molar ratio of the reactants.
[0034] Preferably, the on-line esterification rate analysis system includes a display, the display is connected to the processor 3, and the display is used to display data such as the esterification rate analyzed and calculated by the processor 3 to facilitate real-time monitoring by the staff.
[0035] In summary, the present utility model provides an on-line esterification rate analysis system, which includes: a melt pipe; a transparent pipe 1, both ends of the transparent pipe 1 are respectively used to communicate with the melt pipe 4, and the inner diameter of the transparent pipe 1 is the same as that of the melt pipe 4; a processor 3; a spectral analyzer 2, the spectral analyzer 2 is electrically connected to the processor 3, the spectral analyzer 2 is used to detect the components of the melt in the transparent pipe 1 and transmit the detection result to the processor 3, and the processor 3 is used to analyze and calculate the esterification rate of the melt according to the detection result.
[0036] With the above configuration, the transparent pipe 1 is connected to the melt pipe 4 to receive the melt from the melt pipe 4. By providing the transparent pipe 1, the spectral analyzer 2 can directly detect the melt in the transparent pipe 1 through the transparent pipe 1, avoiding frequent sampling and analysis of the melt, greatly reducing the workload of the staff, saving labor costs. Moreover, by using the spectral analyzer 2 in combination with the processor 3 to analyze the melt, the esterification rate can be calculated in real time, avoiding the lag and error caused by the traditional sampling measurement method. In addition, the present utility model does not require an additional bypass branch to be connected to the main melt pipe, nor does it affect the flow state of the melt in the main melt pipe, eliminating the influence of the relatively high gas content in the melt in the bypass branch on the measurement data and ensuring the accuracy of the esterification rate measurement. In short, the present utility model can analyze and calculate the esterification rate of the melt in real time, with the accuracy of the esterification rate guaranteed, greatly reducing the workload of the staff, and having the characteristics of simple structure and convenient installation.
[0037] It should be noted that the references to "one embodiment", "embodiment", "specific embodiment", "some embodiments", etc. in the specification only indicate that the described embodiments may include specific features, structures or characteristics. Moreover, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in connection with an embodiment, whether explicitly described or not, implementing such feature, structure or characteristic in combination with other embodiments is within the knowledge of those skilled in the relevant art.
[0038] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the system disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description in the method section.
[0039] It should also be noted that although the present utility model has been disclosed above with preferred embodiments, the above embodiments are not intended to limit the present utility model. For any person skilled in the art, without departing from the scope of the technical solution of the present utility model, many possible changes and modifications can be made to the technical solution of the present utility model by using the technical content disclosed above, or modified into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model still fall within the scope of the protection of the technical solution of the present utility model.
[0040] It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are only used to distinguish the various components, elements, steps, etc. in the specification, rather than to represent the logical relationship or sequential relationship, etc. between the various components, elements, steps.
[0041] In addition, it should be recognized that the terms described herein are only used to describe specific embodiments and are not used to limit the scope of the present invention. It must be noted that the singular forms "a" and "an" used herein and in the appended claims include plural referents unless the context clearly dictates otherwise. For example, a reference to "a step" or "a device" means a reference to one or more steps or devices and may include sub-steps and sub-devices. All conjunctions used should be understood in their broadest sense. Also, the word "or" should be understood to have the definition of a logical "or", rather than the definition of a logical "exclusive or", unless the context clearly dictates otherwise. In addition, the implementation of the methods and / or devices in the embodiments of the present invention may include performing the selected tasks manually, automatically, or in combination.
Claims
1. An online esterification rate analysis system, characterized in that: include: Melt pipes; A transparent pipe, both ends of which are respectively used to communicate with the reaction kettle through the melt pipe; processor; A spectrometer is electrically connected to the processor, and is used to detect the components of the melt in the transparent pipe and transmit the detection results to the processor, wherein the detection results are used to reflect the esterification rate of the melt.
2. The online esterification rate analysis system according to claim 1, characterized in that: The transparent pipe comprises a glass pipe.
3. The online esterification rate analysis system according to claim 1, characterized in that: The spectrum analyzer is an absorption spectrometer.
4. The online esterification rate analysis system according to claim 3, characterized in that: The absorption spectrometer includes a light source component and a detection component. The light source component is used to irradiate light to the transparent pipe. The detection component is used to receive the light emitted by the transparent pipe and obtain the detection result. The detection component is electrically connected to the processor.
5. The online esterification rate analysis system according to claim 4, characterized in that: The light source assembly includes a light source and a grating.
6. The online esterification rate analysis system according to claim 1, characterized in that: The online esterification rate analysis system comprises a display, and the display is connected to the processor.
7. The online esterification rate analysis system according to claim 1, characterized in that: The processor obtains the actual ester content according to the analysis of the detection result, and obtains the esterification rate according to the theoretical ester content and the actual ester content.
8. The online esterification rate analysis system according to claim 1, characterized in that: Both ends of the transparent pipe are connected to the melt pipe through flanges respectively.
9. The online esterification rate analysis system according to claim 1, characterized in that: The length of the transparent pipe is 180mm-220mm.
10. The online esterification rate analysis system according to claim 1, characterized in that: The transparent pipe is integrally formed with the melt pipe.