PH control system and method for oily reactants

Abstract

The invention provides a PH control system and method for oily reactants, and relates to the technical field of automatic control, the PH control system comprises an automatic sampling subsystem, a PH control subsystem and an alkali liquor control subsystem; the automatic sampling subsystem comprises a reaction kettle, a buffer pool and a sample conveying pump; the PH control subsystem comprises a PH value detection sensor and a PH controller, and the PH value detection sensor is arranged at the end, close to the pool bottom, in the buffer pool and connected with the PH controller; the alkali liquor control subsystem comprises an alkali liquor metering tank, a weighing detection sensor, an alkali liquor controller and an alkali liquor feeding regulating valve, the outlet end of the alkali liquor metering tank is connected with the inlet end of the reaction kettle through a pipeline, and the alkali liquor feeding regulating valve is arranged on the pipeline for connecting the outlet end of the alkali liquor metering tank with the inlet end of the reaction kettle; and the weighing detection sensor is arranged on the alkali liquor metering tank. According to the invention, accurate PH control of the oily reactants is realized.

Description

Technical Field

[0001] The present invention relates to the field of automatic control technology, and in particular to a pH control system and method for oily reactants. Background Art

[0002] Oily reactants refer to those substances that use oil or organic solvents as media or components in chemical reactions. In the fine chemical industry, changes in pH value will affect the quality of the final product, and maintaining a stable pH value helps to ensure the consistency of product quality. However, since oily reactants are easily attached to pH sensors, conventional pH online detection of non-oily liquids is not possible. Manual sampling and offline detection can only be used. Frequent sampling and manual testing increase the workload of operators and are prone to fatigue, thereby increasing the risk of human error. At the same time, since oily substances have a small specific gravity and often float on the upper layer of liquid materials, non-oily liquid sampling is difficult and the sample accuracy is poor. The process of manual detection and adjustment of pH value is usually slow, which will delay the response to process changes and cannot meet the needs of precise pH control in actual production. Summary of the invention

[0003] The present invention aims to solve at least one of the above problems.

[0004] To solve the above problems, the present invention provides a pH control system and method for oily reactants.

[0005] In a first aspect, the present invention provides a pH control system for oily reactants, the pH control system comprising an automatic sampling subsystem, a pH control subsystem and an alkali solution control subsystem;

[0006] The automatic sampling subsystem comprises a reactor, a buffer tank and a sample delivery pump, wherein the outlet of the reactor is connected to the inlet of the buffer tank through a pipeline, and the sample delivery pump is arranged on the pipeline connecting the outlet of the reactor and the inlet of the buffer tank;

[0007] The PH control subsystem includes a PH value detection sensor and a PH controller, wherein the PH value detection sensor is arranged at one end of the buffer tank near the bottom of the buffer tank and connected to the PH controller, wherein the PH value detection sensor is used to detect the current PH value of the non-oily liquid of the oil-containing reactant in the buffer tank, and the PH controller is used to obtain the alkali solution adjustment value according to the current PH value;

[0008] The alkali liquid control subsystem includes an alkali liquid metering tank, a weighing detection sensor, an alkali liquid controller and an alkali liquid feeding regulating valve. The outlet end of the alkali liquid metering tank is connected to the inlet end of the reactor through a pipeline. The alkali liquid feeding regulating valve is arranged on the pipeline connecting the outlet end of the alkali liquid metering tank and the inlet end of the reactor. The weighing detection sensor is arranged on the alkali liquid metering tank. The alkali liquid controller is respectively connected to the pH controller, the alkali liquid feeding regulating valve and the weighing detection sensor. The alkali liquid controller is used to control the alkali liquid feeding regulating valve.

[0009] Optionally, the automatic sampling subsystem also includes a reflux liquid phase valve and a reflux oil phase valve. The reflux liquid phase end and the reflux oil phase end of the buffer tank are respectively connected to the inlet end of the reactor through pipelines. The reflux liquid phase valve is arranged on the pipeline connecting the reflux liquid phase end of the buffer tank and the inlet end of the reactor, and the reflux oil phase valve is arranged on the pipeline connecting the reflux oil phase end of the buffer tank and the inlet end of the reactor.

[0010] Optionally, the automatic sampling system also includes a buffer tank interface control module, which includes a buffer tank detection sensor, a buffer tank interface controller and a buffer tank interface regulating valve. The buffer tank detection sensor is arranged at a preset height in the buffer tank, and the pH value detection sensor is arranged in a preset area in the buffer tank, and the preset area is determined according to the preset height. The buffer tank interface controller is respectively connected to the buffer tank detection sensor and the buffer tank interface regulating valve, and the buffer tank interface regulating valve is arranged on a pipeline connecting the reflux liquid phase end of the buffer tank and the inlet end of the reactor.

[0011] Optionally, the PH control system also includes an automatic cleaning subsystem; the automatic cleaning subsystem includes a cleaning liquid tank, a cleaning liquid recovery module, a cleaning liquid feed valve and a cleaning liquid discharge valve, the outlet end of the cleaning liquid tank is connected to the inlet end of the buffer tank through a pipeline, the inlet end of the cleaning liquid recovery module is connected to the cleaning liquid reflux end of the buffer tank through a pipeline, the cleaning liquid feed valve is arranged on the pipeline connecting the outlet end of the cleaning liquid tank and the inlet end of the buffer tank, and the cleaning liquid discharge valve is arranged on the pipeline connecting the inlet end of the cleaning liquid recovery module and the cleaning liquid reflux end of the buffer tank.

[0012] Optionally, the automatic sampling subsystem further comprises a bottom discharge valve and a sample sampling valve, wherein the bottom discharge valve is arranged at the bottom of the reactor, and the sample sampling valve is arranged on a pipeline connecting the outlet end of the reactor and the inlet end of the buffer tank.

[0013] Optionally, the alkali liquid control subsystem further includes an alkali liquid discharge valve and a reactor feed valve, and the alkali liquid discharge valve and the reactor feed valve are arranged on a pipeline connecting the outlet end of the alkali liquid metering tank and the inlet end of the reactor.

[0014] Optionally, the pH control system also includes a control subsystem; the control subsystem includes a logic controller, and the logic controller is respectively connected to the sample delivery pump, the bottom discharge valve, the sample sampling valve, the reflux liquid phase valve, the reflux oil phase valve, the cleaning liquid feed valve, the cleaning liquid discharge valve, the alkali liquid discharge valve and the reactor feed valve.

[0015] In a second aspect, the present invention provides a method for controlling pH of an oily reactant, comprising:

[0016] The reaction liquid in the reactor is transported to the buffer tank through a sample transport pump to obtain an oil-containing reactant;

[0017] Detecting the current pH value of the non-oily liquid of the oil-containing reactant in the buffer tank by a pH value detection sensor;

[0018] Obtaining an alkali solution adjustment value according to the current pH value by a pH controller;

[0019] The alkali liquid controller controls the alkali liquid feeding regulating valve to deliver the alkali liquid to the reactor according to the alkali liquid adjustment value, and repeats the step of delivering the reaction liquid in the reactor to the buffer tank through the sample delivery pump to obtain the oil-containing reactant until the current pH value of the non-oily liquid of the oil-containing reactant reaches the target pH value.

[0020] Optionally, obtaining the alkali solution adjustment value according to the current pH value by using a pH controller includes:

[0021] Get the current PH standard value;

[0022] The alkali solution adjustment value is obtained by the PH controller according to the difference between the PH standard value at the current moment and the current PH value.

[0023] Optionally, obtaining the current pH standard value includes:

[0024] Get the current reaction time;

[0025] When the current reaction time is less than or equal to the preset time, the current reaction time is input into the first preset pH standard value model to obtain the current pH standard value;

[0026] Wherein, the first preset pH standard value model is:

[0027] PH std =SV1011 ×T,

[0028]

[0029] Among them, PH std is the current pH standard value, SV101 1 is the uniform change of the first pH value, T is the current reaction time, SVPH101 1 is the first preset pH value, t 1 is the first preset reaction time;

[0030] When the current reaction time is greater than the preset time, the current reaction time is input into a second preset pH standard value model to obtain the current pH standard value;

[0031] Wherein, the second preset pH standard value model is:

[0032] PH std =SV101 2 ×T,

[0033]

[0034] Among them, SV101 2 is the uniform change of the second pH value, SVPH101 2 is the second preset pH value, t 2 It is the second preset reaction time.

[0035] The beneficial effects of the pH control system and method of the oily reactant of the present invention are: the oily reactant in the reactor is transported to the buffer tank by a sample delivery pump, so as to realize automatic sampling of the oily reactant, reduce the risk of human error, improve the sampling accuracy of the sample, and reduce the workload of the operator. The current pH value of the oily reactant is detected in real time by a pH value detection sensor, so as to realize continuous monitoring of the pH value in the whole reaction process. The pH controller calculates the pH adjustment value according to the current pH value and the uniform change amount, and uses the pH adjustment value as the adjustment target of the alkali liquid controller to adjust the pH of the oily reactant, and responds to the pH change in real time. The weighing detection sensor is set on the alkali liquid metering tank, and the alkali liquid controller controls the alkali liquid feeding regulating valve through the obtained alkali liquid adjustment value in conjunction with the weighing detection sensor, so as to accurately control the amount of alkali liquid added, and ensure that the amount of alkali liquid added each time meets the process requirements, thereby improving the product quality and meeting the needs of accurate and rapid pH control in actual production. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of a pH control system for an oily reactant according to an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of another pH control system for oily reactants according to an embodiment of the present invention;

[0038] Figure 3 A schematic flow chart of a pH control system for an oily reactant according to an embodiment of the present invention;

[0039] Figure 4 Schematic diagram of the correlation between pH standard value and time according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0041] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0042] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0043] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0044] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only used for illustrative purposes, and are not used to limit the scope of these messages or information.

[0045] In the related art, oily reactants refer to compounds that are involved in chemical reactions and have oily properties or use oil as a medium. Such reactants are usually non-polar or hydrophobic, because oily substances are generally not easily soluble in water. They may include natural oils (such as vegetable oils and animal fats), synthetic oils, and various organic solvents. At present, there are two situations in which oily reactants in the fine chemical industry need to detect pH. One is that oily substances (such as toluene, dichloromethane, etc.) are required as carriers to participate in the reaction process to form a mixture, and the other is that the reaction produces oily organic matter. Oily reactants cannot be detected by conventional pH online because oily substances are easily attached to pH sensors. Only manual sampling and offline detection can be used. However, oily substances have a small specific gravity and often float on the upper layer of liquid materials, resulting in difficult sampling, poor sample accuracy, long detection time, large hysteresis, etc., which affect production and product quality. At the same time, national safety requires unmanned operation of Class A workshops and environmental protection prohibits uncapping sampling. At present, most of the fine chemical production enterprises in my country use manual sampling and offline analysis for pH detection and control of oily reactants, which has the following disadvantages: oily substances are easy to wrap around pH sensors, and operators can only take samples manually; most of the fine chemical reactors are made of enamel materials or have bottom valves, and it is difficult to open holes, which is a problem for automatic sampling; oily substances have a small specific gravity and often float on the upper layer of liquid materials, and it is difficult to accurately take non-oily liquid samples by manual sampling; some oily reaction processes belong to Class A workshops, which have safety hazards, and on-site sampling does not meet the unmanned operation requirements of Class A workshops in national security policies; the production environment is harsh, with high temperature, toxicity, stench and other harsh environments, which are not conducive to the health of on-site sampling operators; manual sampling, offline analysis, long detection time, large hysteresis, and difficulty in controlling pH value lead to high and low pH indicators, which seriously affect the quality and output of products; currently, due to the oily characteristics, the use of conventional reactor top sampling and direct pH sensor analysis of fine chemical oily reactants cannot meet the process requirements; it is difficult to remove oily substances after online analysis using traditional pH sensors, and it is impossible to keep the sensor clean.

[0046] In view of the problems existing in the above-mentioned related technologies, this embodiment provides a pH control system and method for oily reactants.

[0047] like Figure 1 As shown, an embodiment of the present invention provides a PH control system for oily reactants, wherein the PH control system includes an automatic sampling subsystem, a PH control subsystem and an alkali solution control subsystem;

[0048] The automatic sampling subsystem comprises a reactor, a buffer tank and a sample delivery pump, wherein the outlet of the reactor is connected to the inlet of the buffer tank through a pipeline, and the sample delivery pump is arranged on the pipeline connecting the outlet of the reactor and the inlet of the buffer tank;

[0049] The PH control subsystem includes a PH value detection sensor and a PH controller, wherein the PH value detection sensor is arranged at one end of the buffer tank near the bottom of the tank and connected to the PH controller, the PH value detection sensor is used to detect the current PH value of the oil-containing reactant in the buffer tank, and the PH controller is used to obtain the alkali solution adjustment value according to the current PH value;

[0050] The alkali liquid control subsystem includes an alkali liquid metering tank, a weighing detection sensor, an alkali liquid controller and an alkali liquid feeding regulating valve. The outlet end of the alkali liquid metering tank is connected to the inlet end of the reactor through a pipeline. The alkali liquid feeding regulating valve is arranged on the pipeline connecting the outlet end of the alkali liquid metering tank and the inlet end of the reactor. The weighing detection sensor is arranged on the alkali liquid metering tank. The alkali liquid controller is respectively connected to the pH controller, the alkali liquid feeding regulating valve and the weighing detection sensor. The alkali liquid controller is used to control the alkali liquid feeding regulating valve.

[0051] Specifically, Figure 2 As shown, after confirming that all equipment has passed the self-test and is operating normally, the operator starts the sample delivery pump P101 to deliver the oil-containing reactants of the reactor R101 to the buffer tank. The sample delivery pump P101 is used to control the start and stop of the sample delivery. After the buffer tank reaches the specified liquid phase interface. The pH value detection sensor PHT101 fully contacts the liquid phase area to detect the pH value. The pH controller PHC101 obtains the alkali solution adjustment value according to the current pH value and sends the alkali solution adjustment value to the alkali solution controller WC101. The weighing detection sensor WT101 is set on the alkali solution metering tank V101. The weighing detection sensor WT101 is used to realize the weight detection of the alkali solution to obtain the alkali solution weight value. The alkali solution controller WC101 receives the alkali solution weight value and the alkali solution control value, and adjusts the alkali solution feeding regulating valve WV101 according to the alkali solution weight value and the alkali solution control value to realize the control of the alkali addition amount of the reactor R101.

[0052] In this embodiment, a sample delivery pump is used to deliver the oil-containing reactants in the reactor to the buffer tank, so as to realize automatic sampling of oily reactants, reduce the risk of human error, improve the accuracy of sample sampling, and reduce the workload of operators. The current pH value of the oil-containing reactants is detected in real time by the pH value detection sensor, so as to realize continuous monitoring of the pH value during the entire reaction process. The pH controller obtains the alkali solution adjustment value according to the current pH value, adjusts the pH of the oil-containing reactants by accurately calculating the alkali solution adjustment value, and responds to the pH change in real time. The weighing detection sensor is set on the alkali solution metering tank. The alkali solution controller controls the alkali solution feeding regulating valve through the obtained alkali solution adjustment value in conjunction with the weighing detection sensor, so as to accurately control the amount of alkali solution added, and ensure that the amount of alkali solution added each time meets the process requirements, thereby improving product quality and meeting the need for accurate pH control in actual production.

[0053] Optionally, the automatic sampling subsystem also includes a reflux liquid phase valve and a reflux oil phase valve. The reflux liquid phase end and the reflux oil phase end of the buffer tank are respectively connected to the inlet end of the reactor through pipelines. The reflux liquid phase valve is arranged on the pipeline connecting the reflux liquid phase end of the buffer tank and the inlet end of the reactor, and the reflux oil phase valve is arranged on the pipeline connecting the reflux oil phase end of the buffer tank and the inlet end of the reactor.

[0054] Optionally, the automatic sampling system also includes a buffer tank interface control module, which includes a buffer tank detection sensor, a buffer tank interface controller and a buffer tank interface regulating valve. The buffer tank detection sensor is arranged at a preset height in the buffer tank, and the pH value detection sensor is arranged in a preset area in the buffer tank, and the preset area is determined according to the preset height. The buffer tank interface controller is respectively connected to the buffer tank detection sensor and the buffer tank interface regulating valve, and the buffer tank interface regulating valve is arranged on a pipeline connecting the reflux liquid phase end of the buffer tank and the inlet end of the reactor.

[0055] Specifically, the reflux liquid phase end can be located at the bottom of the buffer tank, and the reflux oil phase end can be located at a preset height on the wall of the buffer tank. The reflux liquid phase valve KV105 is arranged at the bottom of the buffer tank. The reflux liquid phase valve KV105 is a discharge valve for the liquid phase reflux of the buffer tank, which controls the opening and closing of the liquid phase reflux into the kettle. The reflux oil phase valve KV106 is arranged on the side wall of the buffer tank. The reflux oil phase valve KV106 is a discharge valve for the oil phase reflux of the buffer tank, which controls the opening and closing of the oil phase reflux into the kettle. The buffer tank detection sensor LT101 is an oil / liquid interface detection sensor of the buffer tank, which realizes the detection and data transmission of the oil / liquid interface. The buffer tank interface regulating valve LV101 is a liquid phase interface regulating valve of the buffer tank, which controls and regulates the liquid phase interface at a specified position. The buffer tank interface controller LIC101 is a liquid phase interface controller of the buffer tank, which realizes automatic control of the liquid phase interface of the buffer tank. When the liquid level in the buffer tank reaches the specified liquid phase interface, the liquid level detector LT101 will detect this change. After the liquid level controller LIC101 receives the signal from the liquid level detector, it will open the buffer tank interface regulating valve LV101, the reflux liquid phase valve KV105, the reflux oil phase valve KV106 and the buffer tank interface regulating valve LV101 after the buffer tank reaches the specified liquid phase interface to stabilize the liquid phase interface according to the interface requirements.

[0056] In this optional embodiment, the oily reactants in the reactor are obtained through the buffer tank, which solves the problem of manual sampling on site, realizes unmanned sampling operation in Class A workshops, and avoids the problem that on-site operation in harsh environments is not conducive to the health and safety of personnel. By setting the reflux liquid phase valve and the reflux oil phase valve at different positions of the buffer tank, the reflux of the oil phase and the liquid phase is achieved, and the oil phase or excess liquid phase is refluxed to the reactor. Through the buffer tank interface control module, the buffer tank oil and liquid phase interface control is completed according to the process parameter requirements to ensure that the pH sensor is immersed in the liquid phase as much as possible to fully contact to complete the pH detection. The problem of uncontrollable product quality and output caused by manual operation can be solved, the difference in product batches can be reduced, and the product quality and output can be improved.

[0057] Optionally, the PH control system also includes an automatic cleaning subsystem; the automatic cleaning subsystem includes a cleaning liquid tank, a cleaning liquid recovery module, a cleaning liquid feed valve and a cleaning liquid discharge valve, the outlet end of the cleaning liquid tank is connected to the inlet end of the buffer tank through a pipeline, the inlet end of the cleaning liquid recovery module is connected to the cleaning liquid reflux end of the buffer tank through a pipeline, the cleaning liquid feed valve is arranged on the pipeline connecting the outlet end of the cleaning liquid tank and the inlet end of the buffer tank, and the cleaning liquid discharge valve is arranged on the pipeline connecting the inlet end of the cleaning liquid recovery module and the cleaning liquid reflux end of the buffer tank.

[0058] Specifically, the cleaning liquid feed valve KV107 is the feed valve for the cleaning liquid to enter the buffer tank, and controls the opening and closing of the cleaning liquid. The cleaning liquid discharge valve KV108 is the buffer tank cleaning return liquid discharge valve, and controls the opening and closing of the cleaning recovery liquid.

[0059] In this optional embodiment, the oily reactant PH online automatic cleaning subsystem removes the oily substances attached to the PH sensor, keeps the sensor clean, extends the life of the sensor, and reduces production costs.

[0060] Optionally, the automatic sampling subsystem further comprises a bottom discharge valve and a sample sampling valve, wherein the bottom discharge valve is arranged at the bottom of the reactor, and the sample sampling valve is arranged on a pipeline connecting the outlet end of the reactor and the inlet end of the buffer tank.

[0061] Specifically, the bottom discharge valve KV103 is the bottom discharge valve of the reactor R101, which controls the opening and closing of the reactor discharge. The sample sampling valve KV104 is the oil-containing reactant sampling valve, which controls the opening and closing of the sampling.

[0062] Optionally, the alkali liquid control subsystem further includes an alkali liquid discharge valve and a reactor feed valve, and the alkali liquid discharge valve and the reactor feed valve are arranged on a pipeline connecting the outlet end of the alkali liquid metering tank and the inlet end of the reactor.

[0063] Specifically, the alkali liquid discharge valve KV101 is the discharge valve of the alkali liquid metering tank V101, which controls the opening and closing of the alkali liquid discharge. The reactor feed valve KV102 is the feed valve of the alkali liquid into the reactor R101, which controls the opening and closing of the alkali liquid into the reactor. The alkali liquid discharge valve KV101 is arranged on the side close to the outlet end of the alkali liquid metering tank, and the reactor feed valve KV102 is arranged on the side close to the inlet end of the reactor. In the chemical reaction process of the oily reactant, a neutralization reaction is used to adjust the pH value under specific pH conditions. During the reaction, the pH value is quickly and accurately controlled at a certain rate according to the actual process requirements. For example, the oily vervain and acidic substances produced in the production process of vervain need to be quickly neutralized by adding alkali to remove the acidic substances after the reaction is completed. The neutralization reaction generates sodium chloride which is easy to crystallize and clog the pipeline. Therefore, a hole is opened on the bottom valve of the kettle to sample the non-oily material at the bottom of the kettle. The sample is pumped to the buffer tank to detect the pH value. According to the requirements of the pH algorithm, the amount of alkali added is quickly and accurately adjusted until the pH meets the process requirements, and the pH sensor and buffer tank are cleaned in time.

[0064] Optionally, the pH control system also includes a control subsystem; the control subsystem includes a logic controller, and the logic controller is respectively connected to the sample delivery pump, the bottom discharge valve, the sample sampling valve, the reflux liquid phase valve, the reflux oil phase valve, the cleaning liquid feed valve, the cleaning liquid discharge valve, the alkali liquid discharge valve and the reactor feed valve.

[0065] Specifically, LC101 is a logic controller that realizes the logical relationship and safety interlock control of automatic sampling, automatic conveying, automatic detection, automatic cleaning, and automatic alkali solution feeding. The logic controller controls the feeding and discharging process, and each valve controls the entry of raw materials and the discharge of finished products according to the instructions of the logic controller.

[0066] In this optional embodiment, the logic controller mainly cooperates to complete the logical sequences of initial safety check, sampling control, buffer tank interface control, alkali solution feeding, cleaning control, etc., thereby completing automatic sampling, automatic control of the buffer tank interface, automatic alkali solution feeding, automatic cleaning control, etc.

[0067] In some more specific embodiments, the pH control subsystem further includes an algorithm controller AC101, which is an algorithm controller that calculates different alkali addition requirements according to different process requirements and implements a control algorithm for alkali solution addition.

[0068] In some more specific embodiments, Figure 2As shown, when the oily reactant includes an oil phase layer and a liquid phase layer, the oil phase layer is usually an organic solvent or oily substance, and the liquid phase layer may be an aqueous phase or other liquids that are incompatible with oil. After the operator completes the self-inspection of each device and sets the pH value to be controlled according to the process parameter requirements, he opens the sample sampling valve KV104 and starts the sample delivery pump P101 to deliver the oily reactant in the reactor R101 to the buffer tank. After the buffer tank reaches the specified liquid phase interface, open the buffer tank interface regulating valve LV101, the reflux liquid phase valve KV105 and the reflux oil phase valve KV106 as well as the buffer tank interface regulating valve LV101, stabilize the liquid phase interface according to the interface requirements, and reflux the oil phase or excess liquid phase to the reactor by refluxing the oil phase and the reflux liquid phase. The pH value detection sensor PHT101 is in full contact with the liquid phase area to detect the pH value. The pH controller PHC101 obtains the alkali solution adjustment value according to the current pH value and sends the alkali solution adjustment value to the alkali solution controller WC101. The alkali solution discharge valve KV101 and the reactor feed valve KV102 are opened, and the alkali solution feeding regulating valve WV101 is controlled by the alkali solution controller WC101 to automatically adjust the amount of alkali added, and the reactor is started to be fed. During the alkali addition process, as the reaction progresses, the alkali addition ends after the reaction reaches the specified pH value. The logic controller LC101 controls the alkali solution discharge valve KV101, the reactor feed valve KV102 and the alkali solution feeding regulating valve WV101 to be closed, as well as the sample sampling valve KV104, the sample delivery pump P101, the reflux liquid phase valve KV105, the reflux oil phase valve KV106 and the buffer tank interface regulating valve LV101. After all valves are closed normally, the cleaning liquid feed valve KV107 is automatically opened to feed for 20 seconds and then closed. At this time, the pH sensor is soaked and cleaned for 60 seconds, and then the cleaning liquid discharge valve KV108 is opened to discharge until it is completed, that is, the pH adjustment of this batch is completed. When it is necessary to discharge, the bottom discharge valve KV103 is started to control the opening and closing of the reactor discharge.

[0069] In some more specific embodiments, the system is divided into four control loops, the sampling buffer pool interface control loop is composed of the buffer pool detection sensor LT101, the buffer pool interface controller LIC101, and the buffer pool interface regulating valve LV101. The alkali solution feeding control loop is composed of the weighing detection sensor WT101, the alkali solution controller WC101, and the alkali solution feeding regulating valve WV101. The PH control loop is composed of the PH value detection sensor PH detection PHT101, the PH controller PHC101, and the algorithm controller AC101. The logic control loop is composed of the logic controller LC101, the alkali solution discharge valve KV101, the reactor feed valve KV102, the reactor bottom discharge valve KV103, the sample sampling valve KV104, the reflux liquid phase valve KV105, the reflux oil phase valve KV106, the cleaning liquid feed valve KV107, the cleaning liquid discharge valve KV108, the sample delivery pump P101, etc.

[0070] like Figure 3 As shown, a method for controlling pH of an oily reactant provided by an embodiment of the present invention comprises:

[0071] Step 310, transporting the reaction liquid in the reactor to the buffer tank through a sample delivery pump to obtain an oil-containing reactant;

[0072] Step 320, detecting the current pH value of the non-oily liquid of the oil-containing reactant in the buffer tank by a pH value detection sensor;

[0073] Step 330, obtaining an alkali solution adjustment value according to the current pH value through a pH controller;

[0074] Step 340, controlling the alkali solution feeding regulating valve to deliver alkali solution to the reactor according to the alkali solution adjustment value through the alkali solution controller, and repeating the step of delivering the reaction liquid in the reactor to the buffer tank through the sample delivery pump to obtain the oil-containing reactant until the current pH value of the non-oily liquid of the oil-containing reactant reaches the target pH value.

[0075] Optionally, obtaining the alkali solution adjustment value according to the current pH value by using a pH controller includes:

[0076] Get the current PH standard value;

[0077] The alkali solution adjustment value is obtained by the PH controller according to the difference between the PH standard value at the current moment and the current PH value.

[0078] Optionally, obtaining the current pH standard value includes:

[0079] Get the current reaction time;

[0080] When the current reaction time is less than or equal to the preset time, input the current reaction time into the first preset pH standard value model to obtain the pH standard value at the current moment;

[0081] Among them, the first preset pH standard value model is:

[0082] pH std = SV101 1 ×T,

[0083]

[0084] Among them, pH std is the pH standard value at the current moment, SV101 1 is the first pH value uniform change amount, T is the current reaction time, SVPH101 1 is the first preset pH value, t 1 is the first preset reaction time;

[0085] When the current reaction time is greater than the preset time, input the current reaction time into the second preset pH standard value model to obtain the pH standard value at the current moment;

[0086] Among them, the second preset pH standard value model is:

[0087] pH std = SV101 2 ×T,

[0088]

[0089] Among them, SV101 2 is the second pH value uniform change amount, SVPH101 2 is the second preset pH value, t 2 is the second preset reaction time.

[0090] Specifically, as Figure 4 shown, SVPH101_1 is the initial target value of pH control and the pH uniform change time t1, and the corresponding curve slope is the pH value uniform change amount SV101_1 = SVPH101_1 / t1; SVPH101_2 is the final target value of pH control and the uniform change time is t2 - t1, and the corresponding curve slope is the pH value uniform change amount SV101_2 = (SVPH101_2 - SVPH101_1) / (t2 - t1). The second preset pH value can be the target pH value. When the current pH value of the non-oily liquid of the oil-containing reactant reaches the second preset pH value, stop transporting the sample to the buffer pool through the sample delivery pump.

[0091] The PH control method of oily reactants in this embodiment is used to implement the PH control system of oily reactants as described above. Its advantages over the prior art are the same as the advantages of the PH control system of oily reactants described above over the prior art, and will not be repeated here.

[0092] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A pH control system for oily reactants, characterized in that: The pH control system includes an automatic sampling subsystem, a pH control subsystem and an alkali solution control subsystem; The automatic sampling subsystem comprises a reactor, a buffer tank and a sample delivery pump, wherein the outlet of the reactor is connected to the inlet of the buffer tank through a pipeline, and the sample delivery pump is arranged on the pipeline connecting the outlet of the reactor and the inlet of the buffer tank; The PH control subsystem includes a PH value detection sensor and a PH controller, wherein the PH value detection sensor is arranged at one end of the buffer tank near the bottom of the buffer tank and connected to the PH controller, wherein the PH value detection sensor is used to detect the current PH value of the non-oily liquid of the oil-containing reactant in the buffer tank, and the PH controller is used to obtain the alkali solution adjustment value according to the current PH value; The alkali liquid control subsystem includes an alkali liquid metering tank, a weighing detection sensor, an alkali liquid controller and an alkali liquid feeding regulating valve. The outlet end of the alkali liquid metering tank is connected to the inlet end of the reactor through a pipeline. The alkali liquid feeding regulating valve is arranged on the pipeline connecting the outlet end of the alkali liquid metering tank and the inlet end of the reactor. The weighing detection sensor is arranged on the alkali liquid metering tank. The alkali liquid controller is respectively connected to the pH controller, the alkali liquid feeding regulating valve and the weighing detection sensor. The alkali liquid controller is used to control the alkali liquid feeding regulating valve.

2. The pH control system for oily reactants according to claim 1, characterized in that: The automatic sampling subsystem also includes a reflux liquid phase valve and a reflux oil phase valve. The reflux liquid phase end and the reflux oil phase end of the buffer tank are respectively connected to the inlet end of the reactor through pipelines. The reflux liquid phase valve is arranged on the pipeline connecting the reflux liquid phase end of the buffer tank and the inlet end of the reactor, and the reflux oil phase valve is arranged on the pipeline connecting the reflux oil phase end of the buffer tank and the inlet end of the reactor.

3. The pH control system for oily reactants according to claim 1, characterized in that: The automatic sampling system also includes a buffer tank interface control module, which includes a buffer tank detection sensor, a buffer tank interface controller and a buffer tank interface regulating valve. The buffer tank detection sensor is arranged at a preset height in the buffer tank, and the pH value detection sensor is arranged in a preset area in the buffer tank, and the preset area is determined according to the preset height. The buffer tank interface controller is respectively connected to the buffer tank detection sensor and the buffer tank interface regulating valve, and the buffer tank interface regulating valve is arranged on a pipeline connecting the reflux liquid phase end of the buffer tank and the inlet end of the reactor.

4. The pH control system for oily reactants according to claim 1, characterized in that: The PH control system also includes an automatic cleaning subsystem; the automatic cleaning subsystem includes a cleaning liquid tank, a cleaning liquid recovery module, a cleaning liquid feed valve and a cleaning liquid discharge valve, the outlet end of the cleaning liquid tank is connected to the inlet end of the buffer tank through a pipeline, the inlet end of the cleaning liquid recovery module is connected to the cleaning liquid reflux end of the buffer tank through a pipeline, the cleaning liquid feed valve is arranged on the pipeline connecting the outlet end of the cleaning liquid tank and the inlet end of the buffer tank, and the cleaning liquid discharge valve is arranged on the pipeline connecting the inlet end of the cleaning liquid recovery module and the cleaning liquid reflux end of the buffer tank.

5. The pH control system for oily reactants according to claim 1, characterized in that: The automatic sampling subsystem further comprises a bottom discharge valve and a sample sampling valve. The bottom discharge valve is arranged at the bottom of the reactor, and the sample sampling valve is arranged on a pipeline connecting the outlet end of the reactor and the inlet end of the buffer tank.

6. The pH control system for oily reactants according to claim 1, characterized in that: The alkali liquid control subsystem further comprises an alkali liquid discharge valve and a reactor feed valve, wherein the alkali liquid discharge valve and the reactor feed valve are arranged on a pipeline connecting the outlet end of the alkali liquid metering tank and the inlet end of the reactor.

7. The pH control system for oily reactants according to claim 1, characterized in that: The PH control system also includes a control subsystem; the control subsystem includes a logic controller, and the logic controller is respectively connected to the sample delivery pump, the kettle bottom discharge valve, the sample sampling valve, the reflux liquid phase valve, the reflux oil phase valve, the cleaning liquid feed valve, the cleaning liquid discharge valve, the alkali liquid discharge valve and the reactor feed valve.

8. A method for controlling pH of an oily reactant, based on the pH control system of the oily reactant according to any one of claims 1 to 7, characterized in that: include: The reaction liquid in the reactor is transported to the buffer tank through a sample transport pump to obtain an oil-containing reactant; Detecting the current pH value of the non-oily liquid of the oil-containing reactant in the buffer tank by a pH value detection sensor; Obtaining an alkali solution adjustment value according to the current pH value by a pH controller; The alkali liquid controller controls the alkali liquid feeding regulating valve to deliver the alkali liquid to the reactor according to the alkali liquid adjustment value, and repeats the step of delivering the reaction liquid in the reactor to the buffer tank through the sample delivery pump to obtain the oil-containing reactant until the current pH value of the non-oily liquid of the oil-containing reactant reaches the target pH value.

9. The pH control method of an oily reactant according to claim 8, characterized in that: The step of obtaining the alkali solution adjustment value according to the current pH value by using the pH controller includes: Get the current PH standard value; The alkali solution adjustment value is obtained by the PH controller according to the difference between the PH standard value at the current moment and the current PH value.

10. The pH control method of an oily reactant according to claim 9, characterized in that: The step of obtaining the current pH standard value includes: Get the current reaction time; When the current reaction time is less than or equal to the preset time, the current reaction time is input into the first preset pH standard value model to obtain the current pH standard value; Wherein, the first preset pH standard value model is: PH std =SV1011×T, Among them, PH std is the current pH standard value, SV1011 is the first pH value uniform change, T is the current reaction time, SVPH1011 is the first preset pH value, and t1 is the first preset reaction time; When the current reaction time is greater than the preset time, the current reaction time is input into a second preset pH standard value model to obtain the current pH standard value; Wherein, the second preset pH standard value model is: PH std =SV1012×T, Among them, SV1012 is the uniform change of the second pH value, SVPH1012 is the second preset pH value, and t2 is the second preset reaction time.

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