Adipic acid crystal circulation dissolving system

Abstract

The utility model belongs to the technical field of adipic acid production equipment, and particularly relates to an adipic acid crystal circulating dissolving system which comprises an adipic acid dissolving heat exchanger, a centrifugal machine, an adipic acid filter cake receiving tank, an adipic acid crystal dissolving tank, an adipic acid dissolving circulating pump and a condensate recovery tank, the adipic acid dissolving heat exchanger is provided with a shell pass pipeline and a tube pass pipeline; the inlet end of a shell pass pipeline of the adipic acid dissolving heat exchanger is connected with a low-pressure steam pipeline; the outlet end of a shell pass pipeline of the adipic acid dissolving heat exchanger is connected with a condensate pipeline, and the outlet end of the condensate pipeline is communicated with a condensate recovery tank; the output end of the centrifugal machine is communicated with the input end of the top of the adipic acid filter cake receiving tank through a pipeline. The system disclosed by the utility model is high in stability and excellent in performance, and can solve the common problems of incomplete dissolution, easiness in pipeline blockage, difficulty in density detection and control and the like in the dissolution and conveying process of high-concentration adipic acid slurry in a hot material circulating dissolution manner.

Description

TECHNICAL FIELD

[0001] The utility model belongs to adipic acid production equipment technical field, concretely relates to a kind of adipic acid crystallization circulating dissolving system. BACKGROUND

[0002] The process for producing adipic acid is to use copper and vanadium as catalyst, oxidize cyclohexanol with nitric acid, and then obtain the reaction product, and finally obtain crude adipic acid after crystallization, concentration, centrifugation. Then, the crude adipic acid is dissolved, decolorized with activated carbon, and then crystallized, concentrated, centrifuged, dried and other processes to obtain refined adipic acid product.

[0003] Due to the easy crystallization of adipic acid, in the dissolving and decolorizing purification process, the traditional stirring and heating dissolving process is used, which may cause problems such as insufficient dissolution of centrifuge cake, unstable concentration control, and easy blockage of conveying pipeline, which is not conducive to continuous production and operation.

[0004] Therefore, the utility model provides an adipic acid crystallization circulating dissolving system, which solves the problems of incomplete dissolution, easy blockage and difficult density detection and control in the dissolving and conveying process of high-concentration adipic acid slurry by means of hot material circulating dissolution. UTILITY MODEL CONTENTS

[0005] In order to solve the above technical problems, the present application provides an adipic acid crystallization circulating dissolving system, which has high stability and excellent performance, and can solve the problems of incomplete dissolution, easy blockage of pipeline, difficult density detection and control in the dissolving and conveying process of high-concentration adipic acid slurry by means of hot material circulating dissolution.

[0006] In order to achieve the above technical purpose, the utility model adopts the following technical scheme:

[0007] An adipic acid crystallization circulating dissolving system, comprising an adipic acid dissolving heat exchanger, a centrifuge, an adipic acid filter cake receiving tank, an adipic acid crystallization dissolving tank, an adipic acid dissolving circulating pump and a condensate recovery tank.

[0008] The adipic acid dissolving heat exchanger is provided with a shell side pipe and a tube side pipe;

[0009] The shell side pipe of the adipic acid dissolving heat exchanger is connected with a low-pressure steam pipe at the inlet end;

[0010] The outlet end of the shell side pipe of the adipic acid dissolving heat exchanger is connected with a condensate pipe, and the outlet end of the condensate pipe is communicated with the condensate recovery tank;

[0011] The output end of the centrifuge is communicated with the input end at the top of the adipic acid filter cake receiving tank through a pipe.

[0012] The heat exchange input pipe of the adipic acid filter cake receiving tank is connected with the inlet end of the coil pipe, and the outlet end of the coil pipe is connected with the heat exchange output pipe of the adipic acid filter cake receiving tank.

[0013] The high-heat pure water is connected with the input end at the top of the adipic acid crystallization and dissolution tank through the hot water dilution pipeline.

[0014] The output end at the bottom of the adipic acid crystallization and dissolution tank is connected with the input end of the adipic acid dissolution circulating pump through the dissolution tank output pipe, and the output end of the adipic acid dissolution circulating pump is provided with two branches, namely a first branch and a second branch.

[0015] The first branch is connected with the inlet end of the tube side pipeline of the adipic acid dissolution heat exchanger, and the outlet end of the tube side pipeline of the adipic acid dissolution heat exchanger is connected with the top end of the adipic acid filter cake receiving tank through a pipeline.

[0016] The second branch is connected with the top end of the adipic acid crystallization and dissolution tank.

[0017] Further, the adipic acid dissolution heat exchanger is a column tube heat exchanger and is vertically placed, the shell side pipeline and the tube side pipeline of the adipic acid dissolution heat exchanger adopt the conventional setting in the prior art, and are not the points of the present application, so they are not described in detail.

[0018] Further, the shell side pipeline of the adipic acid dissolution heat exchanger adopts low-pressure steam as the heat exchange medium.

[0019] Further, the condensate pipeline is further provided with a condensate outlet valve, and the condensate pipeline and the condensate outlet valve are further connected with a first bypass pipe, and the first bypass pipe is provided with a first bypass pipe regulating valve.

[0020] Further, the low-pressure steam pipeline is further provided with a temperature regulating valve, the entering amount of low-pressure steam in the low-pressure steam pipeline and the heat exchange input pipe of the adipic acid filter cake receiving tank is controlled, and the entering amount of low-pressure steam into the shell side pipeline of the adipic acid dissolution heat exchanger and the adipic acid filter cake receiving tank is controlled.

[0021] Further, the adipic acid filter cake receiving tank is further provided with a thermal resistance thermometer, the temperature sensing end of the thermal resistance thermometer extends into the adipic acid filter cake receiving tank, and the thermal resistance thermometer is interlocked with the temperature regulating valve.

[0022] Specifically, the thermal resistance thermometer has a signal sending end, and the temperature regulating valve has a signal receiving end, so that the thermal resistance thermometer can send an opening or closing signal to the temperature regulating valve to control opening or closing of the temperature regulating valve.

[0023] In the utility model, the temperature regulating valve and the thermal resistance thermometer adopt conventional models in the existing equipment, the structure of the thermal resistance thermometer and the interlocking control mode of the thermal resistance thermometer and the temperature regulating valve adopt conventional settings in the existing technology, and are not the invention points of the utility model, so they will not be described again.

[0024] Further, the hot water dilution pipeline is provided with a concentration regulating valve.

[0025] Further, the adipic acid crystallization and dissolution tank is provided with an overflow weir.

[0026] Further, the first branch is a slurry circulation and dissolution line, and the second branch is a slurry detection line.

[0027] Further, the first branch is provided with a dissolution feed valve.

[0028] Further, the second branch is further provided with an adipic acid crystallization and dissolution tank reflux valve; the second branch and the inlet and outlet ends of the adipic acid crystallization and dissolution tank reflux valve are further connected with a second bypass pipe, the second bypass pipe is provided with a Coriolis force mass flowmeter for detecting flow and solution density; the concentration regulating valve and the Coriolis force mass flowmeter are interlocked and controlled, so that the hot water addition amount can be automatically adjusted according to the density detection.

[0029] Specifically, the Coriolis force mass flowmeter has a signal sending end, and the concentration regulating valve has a signal receiving end, so that the Coriolis force mass flowmeter can send an opening or closing signal to the concentration regulating valve to control opening or closing of the concentration regulating valve.

[0030] In the utility model, the concentration regulating valve and the Coriolis force mass flowmeter adopt conventional models in the existing equipment, the structure of the Coriolis force mass flowmeter and the interlocking control mode of the Coriolis force mass flowmeter and the concentration regulating valve adopt conventional settings in the existing technology, and are not the invention points of the utility model, so they will not be described again.

[0031] Further, the inlet and outlet ends of the Coriolis force mass flowmeter on the second bypass pipe are further respectively provided with a flowmeter inflow valve and a flowmeter outflow valve, when the Coriolis force mass flowmeter fails, the flowmeter inflow valve and the flowmeter outflow valve can be closed, the adipic acid crystallization and dissolution tank reflux valve is opened, and the liquid material in the second branch is directly refluxed to the adipic acid crystallization and dissolution tank for reuse.

[0032] Compared with the prior art, the utility model has the beneficial effects that:

[0033] 1. The utility model discloses a small energy consumption, high fluid turbulence intensity and high crystallization dissolution efficiency.

[0034] 2. The utility model discloses a main use is the uniform solution of the crystallization point of 80 DEG C of the dissolution of the adipic acid filter cake formed in the production process of adipic acid and the deployment. The system performance reliable of the utility model solves the technical problem of the dissolution of adipic acid crystallization. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is the structure diagram of the adipic acid crystallization circulating dissolution system of example 1.

[0036] In the drawing: 1, hot resistance thermometer, 2, temperature regulating valve, 3, centrifuge, 4, Coriolis force mass flowmeter, 5, concentration regulating valve, 6, adipic acid filter cake receiving tank, 7, coil pipe, 8, second branch, 9, hot water dilution pipeline, 10, adipic acid crystallization dissolution tank, 11, adipic acid circulating dissolution pump, 12, first branch, 13, condensate pipeline, 14, adipic acid dissolution heat exchanger, 15, low-pressure steam pipeline, 16, overflow weir, 17, dissolution feed valve, 21, adipic acid filter cake receiving tank heat exchange input pipe, 22, adipic acid filter cake receiving tank heat exchange output pipe, 23, second bypass pipe, 24, adipic acid crystallization dissolution tank backflow valve, 25, condensate outlet valve, 26, first bypass pipe. DETAILED DESCRIPTION

[0037] The utility model will be further described below in conjunction with the embodiment and the drawing, but is not the limitation of the utility model.

[0038] In the description of the utility model, it is necessary to explain that for the orientation word, such as the term "on", "under", "top", "bottom", "in", "out" and so on indicate the orientation and position relation based on the orientation or position relation shown in the drawing, just is for the convenience of narrating the present application and simplifying the description, and is not indicate or imply that the device or element must have the specific orientation, with the specific orientation structure and operation, can not be understood as the limitation of the specific protection scope of the present application.

[0039] It is necessary to explain that the term "first", "second", "third", "1#", "2#" and so on in the specification and claims of the present application are used to distinguish similar objects, and do not have to be used to describe the specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to the embodiment of the present application described herein.

[0040] Example 1

[0041] As Figure 1As shown, a kind of adipic acid crystallization cycle dissolving system, including adipic acid dissolving heat exchanger 14, centrifuge 3, adipic acid filter cake receiving tank 6, adipic acid crystallization dissolving tank 10, adipic acid dissolving circulating pump 11 and condensate recovery tank;

[0042] The adipic acid dissolving heat exchanger 14 is a column tube heat exchanger, adopts vertical placement mode, the adipic acid dissolving heat exchanger 14 is equipped with shell side piping and tube side piping, the shell side piping and tube side piping structure of adipic acid dissolving heat exchanger 14 in the utility model adopt conventional setting in prior art, and it is not the point of the present application, therefore no more.

[0043] The shell side piping of the adipic acid dissolving heat exchanger 14 uses low-pressure steam as heat exchange medium;The shell side piping inlet end of the adipic acid dissolving heat exchanger 14 is connected with low-pressure steam pipeline 15;

[0044] The shell side piping outlet end of the adipic acid dissolving heat exchanger 14 is connected with condensate pipeline 13, and the outlet end of the condensate pipeline 13 is communicated with the condensate recovery tank;Condensate pipeline 13 is also provided with condensate outlet valve 25;Condensate pipeline 13, condensate outlet valve 25 inlet and outlet ends are also connected with first bypass pipe 26, and first bypass pipe 26 is provided with first bypass pipe regulating valve.

[0045] The output end of centrifuge 3 is communicated with the input end of the top of adipic acid filter cake receiving tank 6 through pipeline;Centrifuge 3 is mainly to carry out centrifugation after the reaction product obtained by producing adipic acid is subjected to crystallization and concentration process, and then the fluid material containing filter cake after centrifugation is transported to adipic acid filter cake receiving tank 6 for heating, concentration and impurity removal;

[0046] The coil pipe 7 is arranged in the adipic acid filter cake receiving tank 6, and low-pressure steam is used as heat exchange medium;The inlet end and the outlet end of the coil pipe 7 are both extended out of the adipic acid filter cake receiving tank 6;The low-pressure steam pipeline 15 is also communicated with the inlet end of the coil pipe 7 through the adipic acid filter cake receiving tank heat exchange inlet pipe 21, and the outlet end of the coil pipe 7 is communicated with the condensate pipeline 13 through the adipic acid filter cake receiving tank heat exchange outlet pipe 22;

[0047] The low-pressure steam pipeline 15 is also provided with temperature regulating valve 2, by controlling the amount of low-pressure steam entering the low-pressure steam pipeline 15 and the adipic acid filter cake receiving tank heat exchange inlet pipe 21, the amount of low-pressure steam entering the shell side piping of the adipic acid dissolving heat exchanger 14 and the adipic acid filter cake receiving tank 6 can be controlled, so as to control the temperature in the adipic acid filter cake receiving tank 6 to keep at about 90 DEG C.

[0048] The adipic acid filter cake receiving tank 6 is also provided with thermistor thermometer 1;The temperature sensing end of the thermistor thermometer 1 is extended into the adipic acid filter cake receiving tank 6;The thermistor thermometer 1 is interlocked with the temperature regulating valve 2.

[0049] Specifically, the thermal resistance thermometer 1 has a signal sending end, the temperature regulating valve 2 has a signal receiving end, the thermal resistance thermometer 1 can send an opening or closing signal to the temperature regulating valve 2, and the opening or closing of the temperature regulating valve 2 is controlled;

[0050] In the utility model, the temperature regulating valve 2 and the thermal resistance thermometer 1 adopt conventional models in the existing equipment, the structure of the thermal resistance thermometer 1 and the interlocking control mode of the thermal resistance thermometer 1 and the temperature regulating valve 2 adopt conventional settings in the existing technology, and are not the invention points of the utility model, so the description is not repeated.

[0051] The adipic acid crystallization dissolving tank 10 contains crystallization products in the adipic acid production process; the high-heat pure water is connected with the input end at the top of the adipic acid crystallization dissolving tank 10 through the hot water dilution pipeline 9, and the concentration adjusting valve 5 is arranged on the hot water dilution pipeline 9. The adipic acid crystallization dissolving tank 10 is provided with an overflow weir 16.

[0052] The output end at the bottom of the adipic acid crystallization dissolving tank 10 is connected with the input end of the adipic acid dissolving circulating pump 11 through a dissolving tank output pipeline, and the output end of the adipic acid dissolving circulating pump 11 is provided with two branches, which are a first branch 12 and a second branch 8; the first branch 12 is a slurry circulating dissolving line, and the second branch 8 is a slurry detection line.

[0053] The first branch 12 is connected with the pipe route inlet end of the adipic acid dissolving heat exchanger 14, and the dissolving feed valve 17 is arranged on the first branch 12; the pipe route outlet end of the adipic acid dissolving heat exchanger 14 is connected with the top end of the adipic acid filter cake receiving tank 6 through a pipeline, and liquid is introduced into the adipic acid filter cake receiving tank 6 to disturb the materials in the adipic acid filter cake receiving tank 6.

[0054] Further, the second branch 8 is connected with the top end of the adipic acid crystallization dissolving tank 10; the adipic acid crystallization dissolving tank backflow valve 24 is further arranged on the second branch 8; the second bypass pipe 23 is further connected with the inlet and outlet ends of the adipic acid crystallization dissolving tank backflow valve 24, the Coriolis force mass flowmeter 4 is arranged on the second bypass pipe 23, and the Coriolis force mass flowmeter 4 is used for detecting the flow and the solution density; the concentration adjusting valve 5 is interlocked with the Coriolis force mass flowmeter 4, and the hot water adding amount can be automatically adjusted according to the density detection.

[0055] Specifically, the thermal resistance thermometer 1 has a signal sending end, the temperature regulating valve 2 has a signal receiving end, the thermal resistance thermometer 1 can send an opening or closing signal to the temperature regulating valve 2, and the opening or closing of the temperature regulating valve 2 is controlled;

[0056] The concentration adjusting valve 5 and the Coriolis force mass flowmeter 4 adopt conventional models in the existing equipment, the structure of the Coriolis force mass flowmeter 4 and the interlock control mode of the Coriolis force mass flowmeter 4 and the concentration adjusting valve 5 adopt conventional settings in the prior art, and are not the invention points of the utility model, so the utility model will not be described in detail.

[0057] Further, the Coriolis force mass flowmeter 4 is provided with a flowmeter inflow valve (not shown in the figure) and a flowmeter outflow valve (not shown in the figure) at the inlet and outlet ends respectively, when the Coriolis force mass flowmeter 4 fails, the flowmeter inflow valve and the flowmeter outflow valve can be closed, the adipic acid crystallization and dissolution tank reflux valve 24 is opened, and the liquid material in the second branch 8 is directly refluxed to the adipic acid crystallization and dissolution tank 10 for reuse.

[0058] The utility model mainly has the purposes of dissolving and adjusting the fluid material containing adipic acid filter cake formed in the adipic acid production process into a uniform solution.

[0059] The operation principle of the utility model is as follows:

[0060] 1. Before operation, the use states of the temperature adjusting valve 2, the condensate outflow valve 25, the first bypass pipe adjusting valve, the concentration adjusting valve 5 and the adipic acid crystallization and dissolution tank reflux valve 24 are checked, and the system is started after confirming that the states of the valves are normal.

[0061] 2. The adipic acid crystallization and dissolution tank 10 contains the crystallization product in the adipic acid production process, the concentration adjusting valve 5 is opened first during use, hot water is added to the adipic acid crystallization and dissolution tank 10 through the hot water dilution pipeline 9, the liquid in the adipic acid crystallization and dissolution tank 10 overflows the overflow weir 16, and the crystallization product forms liquid material.

[0062] 3. Then during the system operation, the temperature adjusting valve 2 is opened, low-pressure steam is introduced into the adipic acid filter cake receiving tank 6 through the adipic acid filter cake receiving tank heat exchange connection pipeline 21, and low-pressure steam is introduced into the shell side pipeline of the adipic acid dissolution heat exchanger 14 through the low-pressure steam pipeline 15; the shell side pipeline of the adipic acid dissolution heat exchanger 14 and the adipic acid filter cake receiving tank 6 are heated, and the temperature in the adipic acid filter cake receiving tank 6 is detected through the thermistor thermometer 1.

[0063] The thermistor thermometer 1 is set to 90 DEG C, the thermistor thermometer 1 sends an opening or closing signal to the temperature adjusting valve 2, the flow of low-pressure steam into the adipic acid dissolution heat exchanger 14 or the adipic acid filter cake receiving tank 6 is controlled, and the heating degree of the coil 7 or the adipic acid dissolution heat exchanger 14 to the material in the adipic acid filter cake receiving tank 6 is controlled.

[0064] When the temperature of the material in the adipic acid filter cake receiving tank 6 reaches the set value (90℃), the thermal resistance thermometer 1 sends a closing signal to the temperature regulating valve 2 to close the temperature regulating valve 2, at this time, the centrifuge 3 starts to feed into the adipic acid filter cake receiving tank 6.

[0065] 4. Then, the adipic acid circulating dissolving pump 11 is started, the dissolving feed valve 17 is opened, and the liquid material discharged from the adipic acid crystallization dissolving tank 10 is passed into the tube side pipeline of the adipic acid dissolving heat exchanger 14 through the first branch pipeline 12, and after being heated in the shell side of the adipic acid dissolving heat exchanger 14, it is then fed into the adipic acid filter cake receiving tank 6 to disturb the material in the adipic acid filter cake receiving tank 6;

[0066] With the continuous feeding of the centrifuge 3 into the adipic acid filter cake receiving tank 6, the concentration of the material in the adipic acid filter cake receiving tank 6 increases, and when the concentration of the material in the adipic acid filter cake receiving tank 6 reaches the set value, the material in the adipic acid filter cake receiving tank 6 can be passed into the next process through the external pipeline for decolorization and purification.

[0067] 5. The condensed liquid discharged through the shell side pipeline of the adipic acid dissolving heat exchanger 14 flows into the condensed liquid recovery tank through the condensed liquid pipeline 13; the condensed liquid discharged from the adipic acid filter cake receiving tank 6 flows into the condensed liquid recovery tank through the adipic acid filter cake receiving tank heat exchange output pipeline 22;

[0068] When the condensed liquid outlet valve 25 fails, the condensed liquid outlet valve 25 can also be closed, and the first bypass pipeline regulating valve is opened to discharge the condensed liquid through the first bypass pipeline 26.

[0069] 6. In addition, the liquid material discharged from the adipic acid crystallization dissolving tank 10 can also be returned to the adipic acid crystallization dissolving tank 10 through the second branch pipeline 8, then the density of the material in the adipic acid crystallization dissolving tank 10 is detected by the Coriolis mass flowmeter 4, and the amount of high-temperature pure water fed into the adipic acid crystallization dissolving tank 10 is controlled by sending an opening or closing signal to the concentration regulating valve 5;

[0070] High-temperature pure water is fed into the adipic acid crystallization dissolving tank 10 through the hot water dilution pipeline 9 to reduce the density of the crystallization product in the adipic acid crystallization dissolving tank 10, and the density of the liquid material flowing through the second branch pipeline 8 from the adipic acid crystallization dissolving tank 10 is detected by the Coriolis mass flowmeter 4, when the density of the liquid material decreases to the set standard, the Coriolis mass flowmeter 4 sends a closing signal to the concentration regulating valve 5 to close the concentration regulating valve 5 and stop feeding high-temperature pure water;

[0071] When the Coriolis mass flowmeter 4 fails, the flowmeter inflow valve and the flowmeter outflow valve can be closed, and the adipic acid crystallization dissolving tank return valve 24 is opened to directly return the liquid material in the second branch pipeline 8 to the adipic acid crystallization dissolving tank 10 for reuse.

[0072] The utility model discloses can according to the feature that adipic acid is easy to crystallize, utilize the circulation of adipic acid circulating dissolving pump 11 to replace the traditional stirring action to dissolve adipic acid crystalline body, has the characteristics of small energy consumption, fluid turbulence intensity is high, crystallization dissolving efficiency is high.

[0073] The above embodiment is an example of the embodiment of the utility model, and the embodiment of the utility model is not limited by the above embodiment, and any change, modification, replacement, combination, simplification, which does not deviate from the spirit and principle of the utility model, should be an equivalent replacement mode, and all are included in the protection scope of the utility model.

Claims

1. A circulating dissolution system for adipic acid crystallization, characterized in that, It includes an adipic acid dissolving heat exchanger, a centrifuge, an adipic acid filter cake receiving tank, an adipic acid crystallization dissolving tank, an adipic acid dissolving circulating pump, and a condensate recovery tank; The adipic acid dissolution heat exchanger is provided with shell-side piping and tube-side piping; The shell-side inlet of the adipic acid dissolution heat exchanger is connected to a low-pressure steam pipeline. The shell-side pipeline outlet of the adipic acid dissolution heat exchanger is connected to a condensate pipeline, and the outlet of the condensate pipeline is connected to a condensate recovery tank. The output end of the centrifuge is connected to the input end at the top of the adipic acid filter cake receiving tank via a pipeline; The adipic acid filter cake receiving tank is equipped with a coil, with both the inlet and outlet ends of the coil extending out of the adipic acid filter cake receiving tank; the low-pressure steam pipeline is also connected to the inlet end of the coil through the heat exchange access pipe of the adipic acid filter cake receiving tank, and the outlet end of the coil is connected to the condensate pipeline through the heat exchange output pipe of the adipic acid filter cake receiving tank. The external high-temperature pure water is connected to the input end at the top of the adipic acid crystallization dissolution tank through a hot water dilution pipeline; The output end of the bottom of the adipic acid crystallization dissolving tank is connected to the input end of the adipic acid dissolving circulation pump through the dissolving tank output pipe. The output end of the adipic acid dissolving circulation pump is provided with two branches, namely the first branch and the second branch. The first branch is connected to the inlet end of the tube side of the adipic acid dissolution heat exchanger, and the outlet end of the tube side of the adipic acid dissolution heat exchanger is connected to the top of the adipic acid filter cake receiving tank through a pipeline. The second branch is connected to the top of the adipic acid crystallization dissolution tank.

2. The adipic acid crystallization recycling and dissolution system as described in claim 1, characterized in that, The adipic acid dissolution heat exchanger is a shell-and-tube heat exchanger, which is placed vertically.

3. The adipic acid crystallization recycling and dissolution system as described in claim 1, characterized in that, A condensate outlet valve is also provided on the condensate pipeline; a first bypass pipe is also connected to both ends of the condensate pipeline and the condensate outlet valve, and a first bypass pipe regulating valve is provided on the first bypass pipe.

4. The adipic acid crystallization recycling and dissolution system as described in claim 1, characterized in that, Temperature regulating valves are also installed on the low-pressure steam pipeline.

5. The adipic acid crystallization recycling and dissolution system as described in claim 4, characterized in that, The adipic acid filter cake receiving tank is also equipped with a resistance thermometer; the sensing end of the resistance thermometer extends into the adipic acid filter cake receiving tank; the resistance thermometer is interlocked with the temperature regulating valve.

6. The adipic acid crystallization recycling and dissolution system as described in claim 1, characterized in that, A concentration regulating valve is installed on the hot water dilution pipeline.

7. The adipic acid crystallization recycling and dissolution system as described in claim 1, characterized in that, The adipic acid crystallization dissolution tank is equipped with an overflow weir.

8. The adipic acid crystallization recycling and dissolution system as described in claim 1, characterized in that, The first branch is equipped with a dissolving feed valve.

9. The adipic acid crystallization recycling and dissolution system as described in claim 6, characterized in that, The second branch is also equipped with a reflux valve for the adipic acid crystallization dissolution tank; the inlet and outlet ends of the reflux valve for the adipic acid crystallization dissolution tank on the second branch are also connected to a second bypass pipe, and a Coriolis mass flow meter is installed on the second bypass pipe; the concentration regulating valve is interlocked with the Coriolis mass flow meter.

10. The adipic acid crystallization recycling and dissolution system as described in claim 9, characterized in that, The second bypass pipe is equipped with a flow meter inlet valve and a flow meter outlet valve at both the inlet and outlet ends of the Coriolis mass flow meter.

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