Catalyst filtering system for preparing phenylenediamine

Abstract

The utility model relates to the technical field of chemical filtering, in particular to a catalyst filtering system for preparing phenylenediamine, which comprises a reaction kettle, a gas-liquid separation tank, a filter and a clear liquid tank which are sequentially connected through pipelines, the reaction kettle is provided with a raw material inlet, and the filter is further connected with a nitrogen buffer tank. A one-way valve is arranged between the filter and the nitrogen buffer tank, a plurality of membrane tube assemblies are arranged in the filter, each membrane tube assembly comprises a membrane tube, each membrane tube is in a hollow tube shape with two closed ends, a liquid guide tube and a back-blowing tube are arranged in each membrane tube, each liquid guide tube and each back-blowing tube are in a hollow tube shape, and through holes are formed in the tube walls of the liquid guide tubes and the back-blowing tubes. According to the utility model, waste materials can be reduced, products can be increased, the liquid outlet rate of filtrate can be increased by the liquid guide pipe, the pressure of back-blowing gas is increased and the blowing area and direction of the membrane pipe can be increased by using the uniformly distributed porous back-blowing system, so that solid particles in gaps of the whole membrane pipe can be blown out, and the service life of the membrane pipe is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical filter technical field, concretely relates to a catalyst filter system for preparing phenylenediamine. BACKGROUND

[0002] Phenylenediamine is one of the simplest aromatic diamines, and is also an intermediate with wide application, which can be used for preparing azo dyes, high molecular polymers, and can also be used for producing fur dyeing agent, rubber antioxidant and photographic developer, and in addition, phenylenediamine is also a common sensitive agent for testing iron and copper.

[0003] In the production process of phenylenediamine, filtration is a key step, which is mainly used for removing the catalyst solid impurities generated in the reaction process, so as to ensure the purity and quality of the final product. Since the application field of phenylenediamine has higher requirements on its purity, the existence of impurities may affect the color, stability and performance of the final product. Therefore, the use of efficient filtration process can effectively improve the purity of phenylenediamine and reduce the problems in subsequent processing and application.

[0004] However, in the current production and separation process of phenylenediamine, the commonly used filtration process has some problems. For example, the service life of the membrane tube is short, which leads to frequent replacement and increases the production cost; at the same time, the purging pressure is not thorough, which causes material loss and affects the production efficiency; in addition, the filtration efficiency is low, which may result in low product purity and affect the subsequent application. Therefore, it is urgent to develop more efficient and economical filtration technology to improve the production efficiency and product quality of phenylenediamine. SUMMARY

[0005] In order to solve the above technical problems, the utility model discloses a catalyst filter system for preparing phenylenediamine.

[0006] In order to achieve the above purpose, the technical scheme adopted is:

[0007] A catalyst filter system for preparing phenylenediamine, comprising a reaction kettle, a gas-liquid separation tank, a filter and a clear liquid tank connected in sequence through pipelines, wherein the reaction kettle is provided with a raw material inlet, the filter is further connected with a nitrogen buffer tank, a one-way valve is arranged between the filter and the nitrogen buffer tank, a plurality of membrane tube assemblies are arranged in the filter, the membrane tube assembly comprises a membrane tube, the membrane tube is a hollow tubular structure with both ends closed, a liquid guide pipe and a back flushing pipe are arranged in the membrane tube, and the liquid guide pipe and the back flushing pipe are both hollow tubular structures, and the pipe wall of each is provided with a through hole.

[0008] On the basis of the above technical scheme, the utility model can also be improved as follows:

[0009] Further, the bottom of the filter is connected with a waste catalyst collecting tank.

[0010] Further, a feed pump is arranged between the gas-liquid separation tank and the filter.

[0011] Further, at least one set of membrane tube assemblies is arranged in the upper part and the lower part of the filter.

[0012] Further, the membrane tube assemblies in the upper part of the filter are arranged vertically, and the membrane tube assemblies in the lower part of the filter are arranged horizontally.

[0013] The beneficial effect of the above further technical solution is that the membrane tube assemblies are arranged horizontally at the bottom of the filter, so that the material at the bottom of the filter can be discharged completely.

[0014] Further, the nitrogen buffer tank is connected to the inner cavity of the filter and the back flushing pipe through the one-way valves, wherein the one-way valve is connected to the inner cavity of the filter through the first gas phase pipeline and the outer wall of the filter, and the one-way valve is connected to the back flushing pipe through the second gas phase pipeline and the membrane tube.

[0015] The beneficial effect of the above technical solution is that the one-way valve allows gas to enter the filter only from the nitrogen buffer tank, preventing the material in the filter from flowing back.

[0016] Further, the liquid guide pipe is connected to the clear liquid tank.

[0017] Further, the upper end of the liquid guide pipe penetrates the membrane tube and is connected to the clear liquid tank through the pipeline.

[0018] Further, the liquid guide pipe and the back flushing pipe are both open at both ends.

[0019] Further, the diameter of the through hole in the wall of the liquid guide pipe is one fourth of the diameter of the liquid guide pipe, and the through hole is located at the lower end of the liquid guide pipe.

[0020] Further, the bottom end of the liquid guide pipe is a liquid inlet, the distance between the through hole in the wall of the liquid guide pipe and the liquid inlet is equal to the diameter of the liquid guide pipe, and the through hole has four holes which are evenly distributed around the circumference of the liquid guide pipe.

[0021] The beneficial effect of the above technical solution is that the through hole in the wall of the liquid guide pipe can ensure the liquid inlet area, and the clear liquid can enter the liquid guide pipe from the liquid inlet and the four through holes, thereby increasing the liquid outlet rate of the filtrate.

[0022] Further, the diameter of the through hole in the wall of the back flushing pipe is one fourth of the diameter of the back flushing pipe.

[0023] Further, the wall of the back flushing pipe is provided with a plurality of through holes which are arranged in sequence from top to bottom along the length direction of the back flushing pipe, the uppermost through hole of the back flushing pipe is 3 times the diameter of the back flushing pipe away from the top of the membrane tube, and the through holes are arranged at intervals along the length direction of the back flushing pipe, and the back flushing pipe is evenly provided with four through holes around the circumference, i.e. one through hole is arranged at every 90°.

[0024] The beneficial effects of the above technical solutions are that the average distribution porous back flushing system is used to increase the pressure of the back flushing gas and the sweeping area and orientation of the membrane tube.

[0025] Further, the gas-liquid separation tank is connected with a feed pump, and the gas-liquid separation tank is further provided with a gas outlet.

[0026] The beneficial effects of the above technical solutions are that the gas-liquid separation tank is used for gas-liquid separation, so that the hydrogen gas is discharged from the gas outlet and the liquid enters the feed pump from the bottom of the gas-liquid separation tank.

[0027] Further, the membrane tube is provided with micropores to allow the liquid to enter and not allow the large-particle-size solid such as catalyst to pass through.

[0028] Further, the membrane tube is a ceramic membrane tube or a cloth bag type membrane tube.

[0029] Further, the clear liquid tank is connected with a material transfer pump.

[0030] Compared with the prior art, the beneficial effects of the utility model are that the filter system can effectively reduce the benzene diamine material carried in the catalyst waste residue, reduce the waste material and increase the product, the liquid guide pipe can increase the liquid outlet rate of the filtrate, and the average distribution porous back flushing system is used to increase the pressure of the back flushing gas and the sweeping area and orientation of the membrane tube, so that the solid particles in the whole membrane tube gap can be blown out by the high-pressure gas, and the service life of the membrane tube is increased. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structural schematic view of a catalyst filter system for preparing benzene diamine.

[0032] Figure 2 It is a structural schematic view of a membrane tube assembly.

[0033] Figure 3 It is a cross-sectional view. Figure 2

[0034] The reference signs are: 1, reaction kettle; 2, gas-liquid separation tank; 3, feed pump; 4, filter; 5, nitrogen buffer tank; 6, clear liquid tank; 7, waste catalyst collection tank; 8, one-way valve; 9, material transfer pump; 10, back flushing pipe; 11, liquid guide pipe; 12, membrane tube. DETAILED DESCRIPTION

[0035] ​The following embodiments of the present application will be described in greater detail by way of specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. Although the description of the present application will be introduced in combination with the preferred embodiments, this does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0036] It should be noted that in the specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail below in combination with the drawings.

[0038] Referring to Figures 1-3 A catalyst filtration system for preparing phenylenediamine, comprising a reaction kettle 1, a gas-liquid separation tank 2, a filter 4, a clear liquid tank 6 connected in sequence by pipelines, the reaction kettle 1 is provided with a raw material inlet, the filter 4 is further connected with a nitrogen buffer tank 5, a one-way valve 8 is arranged between the filter 4 and the nitrogen buffer tank 5, a plurality of membrane tube assemblies are arranged in the filter 4, the membrane tube assembly comprises a membrane tube 12, the membrane tube 12 is a hollow tubular structure with both ends closed, a liquid guide pipe 11 and a back flushing pipe 10 are arranged in the membrane tube 12, the liquid guide pipe 11 and the back flushing pipe 10 are both hollow tubular structures, and the pipe wall is provided with a through hole.

[0039] In an optional embodiment, a waste catalyst collection tank 7 is connected to the bottom of the filter 4.

[0040] In an optional embodiment, a feed pump 3 is further arranged between the gas-liquid separation tank 2 and the filter 4.

[0041] As a preferred embodiment, at least one set of membrane tube assemblies is arranged in the upper part and the lower part of the filter 4, Figure 1 The case of three sets of membrane tube assemblies in the upper part and one set of membrane tube assemblies in the lower part is shown.

[0042] In the present embodiment, the upper membrane tube assembly in the filter 4 is arranged vertically, and the membrane tube 12 and the liquid guide tube 11 and the backflushing tube 10 inside the membrane tube 12 extend downward from the upper part of the inside of the filter 4, and the lower membrane tube assembly is arranged horizontally.

[0043] As a preferred embodiment, the nitrogen buffer tank 5 is connected to the inner cavity of the filter 4 and the backflushing tube 10 respectively through one-way valves 8, wherein the one-way valve 8 is connected to the inner cavity of the filter 4 through a first gas phase pipeline and through the outer wall of the filter 4, and the one-way valve 8 is connected to the backflushing tube 10 through a second gas phase pipeline and through the membrane tube 12, and control valves are arranged between the one-way valve 8 and the first gas phase pipeline and between the one-way valve 8 and the second gas phase pipeline.

[0044] In an alternative embodiment, the liquid guide tube 11 is connected to the clear liquid tank 6.

[0045] In the present embodiment, the upper end of the liquid guide tube 11 is connected to the clear liquid tank 6 through a pipeline and through the membrane tube 12.

[0046] In an alternative embodiment, the liquid guide tube 11 and the backflushing tube 10 are both open at both ends.

[0047] As a preferred embodiment, the diameter of the through hole in the wall of the liquid guide tube 11 is one fourth of the diameter of the liquid guide tube 11, and the through hole is located at the lower end of the liquid guide tube 11.

[0048] In the present embodiment, the bottom end of the liquid guide tube 11 is a liquid inlet, the distance between the through hole of the liquid guide tube 11 and the liquid inlet is equal to the diameter of the liquid guide tube 11, there are four through holes, and the through holes are uniformly distributed in the circumferential direction of the liquid guide tube 11.

[0049] In an alternative embodiment, the diameter of the through hole in the wall of the backflushing tube 10 is one fourth of the diameter of the backflushing tube 10.

[0050] In the present embodiment, the wall of the backflushing tube 10 is provided with a plurality of through holes, and the through holes are arranged in order from top to bottom along the length direction of the backflushing tube 10, the uppermost through hole of the backflushing tube 10 is located at a distance of three diameters of the backflushing tube 10 from the top of the membrane tube 12 above, and the through holes are arranged at intervals downward, and the circumferential direction of the backflushing tube 10 is uniformly provided with four through holes, i.e. a through hole is arranged at every 90°.

[0051] As a preferred embodiment, the bottom of the gas-liquid separation tank 2 is connected to the feed pump 3, and the gas-liquid separation tank 2 is further provided with a gas outlet.

[0052] As a preferred embodiment, the membrane tube 12 is a ceramic membrane tube 12 or a cloth bag type membrane tube 12.

[0053] In the present embodiment, the membrane tube 12 is provided with micropores to allow liquid to enter and not allow large-particle-size solids such as catalysts to pass through.

[0054] In the embodiment, the clear liquid tank 6 is connected with a material transfer pump 9.

[0055] In operation, the reactor 1 is connected with a material transfer pump 9.

[0056] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the foregoing is a description of only some of the many possible embodiments of the application, and that various changes and modifications can be made thereto without departing from the spirit and scope of the application.

Claims

1. A catalyst filtration system for the production of phenylenediamine, characterized by, The application relates to a waste catalyst recovery device, which comprises a reaction kettle (1), a gas-liquid separation tank (2), a filter (4) and a clear liquid tank (6) connected in sequence through pipelines, the reaction kettle (1) is provided with a raw material inlet, the filter (4) is further connected with a nitrogen buffer tank (5), a one-way valve (8) is arranged between the filter (4) and the nitrogen buffer tank (5), a plurality of membrane tube assemblies are arranged in the filter (4), the membrane tube assembly comprises a membrane tube (12), the membrane tube (12) is a hollow tubular structure with both ends closed, a liquid guide pipe (11) and a back flushing pipe (10) are arranged in the membrane tube (12), the liquid guide pipe (11) and the back flushing pipe (10) are both hollow tubular structures, and the pipe walls are both provided with through holes.

2. The catalyst filtration system for preparing phenylenediamine according to claim 1, wherein, The bottom of the filter (4) is connected with a waste catalyst collection tank (7).

3. The catalyst filtration system for preparing phenylenediamine according to claim 2, characterized by, A feed pump (3) is further arranged between the gas-liquid separation tank (2) and the filter (4).

4. The catalyst filtration system for preparing phenylenediamine according to claim 1, wherein, At least one group of membrane tube assemblies is arranged in the upper portion and the lower portion of the filter (4).

5. The catalyst filtration system for preparing phenylenediamine according to claim 1, wherein, The nitrogen buffer tank (5) is connected with the inner cavity of the filter (4) and the back flushing pipe (10) through the one-way valve (8).

6. The catalyst filtration system for preparing phenylenediamine according to claim 1, wherein, The liquid guide pipe (11) is connected with the clear liquid tank (6).

7. The catalyst filtration system for producing phenylenediamine according to any one of claims 1 to 6, characterized by, The liquid guide pipe (11) and the back flushing pipe (10) are both open at both ends.

8. The catalyst filtration system for preparing phenylenediamine according to claim 7, characterized by, The diameter of the through hole in the pipe wall of the liquid guide pipe (11) is one fourth of the diameter of the liquid guide pipe (11), and the through hole is located at the lower end of the liquid guide pipe (11).

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