System for purifying diamino maleic dinitrile crude product

Abstract

The utility model discloses a system for purifying a diamino maleic dinitrile crude product, which relates to the technical field of purification and comprises a crystallization centrifugal component, an impurity removal centrifugal component and a crude product dryer, the impurity removal centrifugal assembly comprises a reflux impurity removal kettle communicated with a discharge hole of the first centrifugal machine, a second centrifugal machine communicated with a material outlet of the reflux impurity removal kettle, a reflux condenser communicated with an air outlet of the reflux impurity removal kettle, and an impurity removal solvent metering tank respectively communicated with the second centrifugal machine and the reflux impurity removal kettle; the impurity removal solvent temporary storage tank is communicated with a liquid outlet of the second centrifugal machine; and the crude product dryer is communicated with a discharge hole of the second centrifugal machine. The hydrocyanic acid low-polymer impurity removal device is compact and reasonable in design, can effectively remove hydrocyanic acid low-polymer impurities, simplifies equipment, reduces operation procedures, improves operation automation level, and reduces material loss.

Description

Technical Field

[0001] This utility model relates to the field of purification technology, and more specifically to a system technology for the purification of crude diaminobutene dinitrile. Background Technology

[0002] Diaminomaleitrile, also known as diaminomaleitrile, is a stable tetramer of hydrogen cyanide and an important precursor known for the synthesis of nitrogen-containing cyclic compounds such as imidazoles, pyrazines, and purines. One method for preparing diaminomaleitrile involves using a catalyst of no more than one type in the presence of an organic solvent, controlling the reaction temperature and pressure to polymerize hydrogen cyanide, thus obtaining diaminomaleitrile. After the polymerization reaction of diaminomaleitrile is completed, the added catalyst and the oligomer impurities generated in the reaction solution need to be separated promptly for the first crude purification of diaminomaleitrile. Existing patents disclose the following techniques:

[0003] Patent publication number US3839406 discloses the following method for preparing diaminobutenedionitrile, including the following steps: diluting the solution with hot water after polymerization and removing the black amorphous polymer by filtration. No further treatment measures or corresponding equipment solutions are provided for the hydrogen cyanide oligomer impurities that have similar solubility characteristics to diaminobutenedionitrile in the mixed system.

[0004] Patent publication number JP59116254 discloses the following method for producing diaminobutenedionitrile by polymerization of hydrogen cyanide under the action of an alkaline catalyst and a sulfur-containing auxiliary agent. The separation of the reaction products involves using a high-performance evaporation device such as a rotary evaporator to evaporate the solvent under vacuum, collecting the residual solid, crushing it, and then dissolving and filtering it with acetonitrile, ethyl acetate, toluene, etc., to remove insoluble impurities. The solution is then crystallized to obtain the diaminobutenedionitrile product. Because diaminobutenedionitrile is prone to repolymerization to form a polymer under heating, the solvent can be separated and recycled during solution concentration. However, the product is easily degraded and lost under heating, and the solid formed after evaporation does not remove impurities. The crude product has a low diaminobutenedionitrile content, and the collection and crushing of the solid formed by evaporation and concentration are difficult.

[0005] The method for manufacturing diaminobutenedionitrile disclosed in the above patent does not effectively remove oligomerized hydrogen cyanide impurities. In order to further remove oligomerized hydrogen cyanide impurities from the crude product, a system for purifying crude diaminobutenedionitrile needs to be designed. Utility Model Content

[0006] The purpose of this invention is to provide a system for purifying crude diaminobutene dinitrile in order to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0008] This invention provides a system for purifying crude diaminobutyronitrile, comprising a crystallization centrifuge assembly, a purification centrifuge assembly, and a crude product dryer arranged sequentially using a height difference;

[0009] The crystallization centrifuge assembly includes a crude crystallization tank, a first centrifuge connected to the discharge port at the bottom of the crude crystallization tank, a crystallization condenser connected to the air outlet at the top of the crude crystallization tank, and a centrifugal solvent storage tank connected to the liquid outlet of the first centrifuge.

[0010] The impurity removal centrifuge assembly includes a reflux impurity removal vessel connected to the discharge port of the first centrifuge, a second centrifuge connected to the material outlet of the reflux impurity removal vessel, a reflux condenser connected to the gas outlet of the reflux impurity removal vessel, an impurity removal solvent metering tank connected to the reflux impurity removal vessel, and an impurity removal solvent temporary storage tank connected to the liquid outlet of the second centrifuge.

[0011] The crude product dryer is connected to the discharge port of the second centrifuge.

[0012] In one embodiment, the crude crystallization tank includes a tank body, a crystallization material inlet located at the top of the tank body, a crystallization gas outlet located at the top of the tank body, a crystallization material outlet located at the bottom of the tank body, a stirring mechanism located inside the tank body, and a drive motor located at the top of the tank body to drive the stirring mechanism to rotate. The tank body includes an inner shell and an outer shell, which together form a temperature-controlled cavity. The outer shell is provided with a chilled water inlet pipe and a chilled water outlet pipe that communicate with the interior of the temperature-controlled cavity.

[0013] In one embodiment, the crystallization condenser includes a condenser body, a condensation inlet disposed at one end of the condenser body and connected to the crystallization outlet, and a condensation outlet disposed at the other end of the condenser body and connected to the atmosphere.

[0014] In one embodiment, the first centrifuge includes a centrifuge body, a centrifuge feed inlet disposed at the top of the centrifuge body, a centrifuge discharge outlet disposed at the bottom of the centrifuge body, and a centrifuge liquid outlet disposed at the bottom of the side wall of the centrifuge body.

[0015] The centrifugal feed inlet is connected to the liquid outlet of the crystallized material and the main demineralized water pipe, respectively;

[0016] The centrifuge outlet is connected to the reflux impurity removal vessel;

[0017] The centrifuge outlet is connected to the centrifuge solvent storage tank and the wash water storage tank via pipelines. The outlet of the wash water storage tank is connected to the top of the crude product crystallization tank via a pipeline.

[0018] In one embodiment, the centrifugal solvent storage tank includes a centrifugal solvent storage shell, a centrifugal solvent storage outlet located at the bottom of the centrifugal solvent storage shell, a centrifugal solvent storage inlet located at the top of the centrifugal solvent storage shell, and a centrifugal solvent storage vent located at the top of the centrifugal solvent storage shell.

[0019] In one embodiment, the structure of the reflux condenser is the same as that of the crystallization condenser.

[0020] In one embodiment, the reflux impurity removal vessel includes an impurity removal vessel body, a filter cake feeding port, an impurity removal air outlet, and an impurity removal liquid inlet all disposed on the top of the impurity removal vessel body, an impurity removal material liquid outlet disposed on the bottom of the impurity removal vessel body, a stirring assembly disposed inside the impurity removal vessel body, and a drive mechanism disposed on the top of the impurity removal vessel body to drive the stirring assembly to rotate.

[0021] The impurity removal inlet is connected to the impurity removal solvent metering tank;

[0022] The impurity removal outlet is connected to the reflux condenser;

[0023] The filter cake feeding port is connected to the centrifuge discharge port;

[0024] The outlet for the purified material is connected to the second centrifuge;

[0025] The impurity removal vessel is a double-shell structure, which forms a temperature control cavity. The double-shell structure is equipped with a circulating water inlet pipe and a circulating water outlet pipe that communicate with the inside of the temperature control cavity. It is also equipped with a low-pressure steam inlet and a steam condensate outlet that communicate with the inside of the temperature control cavity.

[0026] In one embodiment, the structure of the second centrifuge is the same as that of the first centrifuge, and the centrifugal feed inlet of the second centrifuge is connected to the liquid outlet of the impurity removed material and the demineralized water rinsing pipe, respectively.

[0027] The centrifuge outlet of the second centrifuge is connected to the pipelines of the impurity removal solvent storage tank and the wash water storage tank, respectively.

[0028] The centrifuge outlet of the second centrifuge is connected to the crude product dryer;

[0029] The structure of the impurity removal solvent metering tank is the same as that of the centrifugal solvent temporary storage tank.

[0030] In one embodiment, the crude product dryer includes a single-cone dryer housing, a single-cone feed inlet disposed at the top of the single-cone dryer housing, and a single-cone discharge outlet disposed at the bottom of the single-cone dryer housing, and also includes a vent outlet disposed at the top of the single-cone dryer housing.

[0031] In one embodiment, the single cone dryer shell is provided with a material spiral rotation heating assembly with a heating chamber, and the single cone dryer shell is provided with a drying hot water inlet and a drying hot water outlet communicating with the heating chamber.

[0032] Working principle:

[0033] In this method, the polymerization reaction solution of diaminobutene dinitrile is transferred to a crystallization tank, water is added, the mixture is stirred and cooled to crystallize, and then the product is centrifuged and washed with water. The resulting crude crystals are transferred to a reflux impurity removal vessel, where impurity removal solvent is added, the temperature is raised to dissolve and kept at that temperature, and then the temperature is lowered. The product is then placed in an impurity removal centrifuge for centrifugation. After centrifugation, the residual impurity removal solvent in the centrifuged solids is washed with deionized water. The centrifuged solids are then manually transferred to a crude product drying room for drying to obtain primary diaminobutene dinitrile crude product.

[0034] The beneficial effects of this utility model are as follows:

[0035] 1. This utility model has a reasonable design. During the production process, the crude crystallized product is transferred to a reflux impurity removal kettle, where a purification solvent is added, heated to dissolve and kept at a constant temperature, then cooled down, and then placed into a purification centrifuge for centrifugation. After centrifugation, the residual purification solvent in the centrifuged solid is washed with demineralized water, which can effectively remove oligomerized hydrogen cyanide impurities. Moreover, the solid is rinsed with demineralized water, resulting in less purification solvent content in the solid. This solution has the advantages of less drying solvent loss, lower production costs, environmental friendliness, shorter drying time, and lower energy consumption.

[0036] 2. This utility model has a compact and reasonable design, which simplifies the equipment, reduces the number of operating procedures, and improves the automation of operation; it reduces material loss and safety risks caused by leakage from multiple equipment transfers, reduces investment in equipment such as pumps, and reduces the occupation of factory land.

[0037] 3. Based on the heat-sensitive characteristics of the material handling process, the equipment layout makes full use of the elevation difference, the equipment connection is compact, the material flow is smooth, and the product loss caused by material retention time and the maintenance safety risks are reduced. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of this utility model;

[0040] Figure 2 This is a schematic diagram of the structure of the crude product crystallization tank;

[0041] Figure 3 This is a schematic diagram of the first centrifuge;

[0042] Figure 4 This is a schematic diagram of the structure of a centrifugal solvent storage tank;

[0043] Figure 5 This is a schematic diagram of the reflux impurity removal reactor;

[0044] Figure 6 This is a schematic diagram of the structure of a crude product dryer;

[0045] Figure labels: 1-Crystallization condenser, 2-Crude product crystallization tank, 3-First centrifuge, 4-Centrifugal solvent storage tank, 5-Reflux condenser, 6-Impurity removal solvent metering tank, 7-Reflux impurity removal kettle, 8-Second centrifuge, 9-Impurity removal solvent storage tank, 10-Crude product dryer;

[0046] 21-Drive motor, 22-Crystallized material inlet, 23-Inner shell, 24-Outer shell, 25-Stirring mechanism, 26-Crystallized material outlet, 27-Chilled water inlet pipe, 28-Chilled water outlet pipe, 29-Crystallization gas outlet;

[0047] 31-Centrifuge body, 32-Centrifuge discharge port, 33-Centrifuge liquid outlet, 34-Centrifuge feed port, 35-Deionized water main pipe, 36-Wash water storage tank pipe;

[0048] 41-Centrifugal solvent temporary storage inlet, 42-Centrifugal solvent temporary storage outlet, 43-Centrifugal solvent temporary storage shell, 44-Centrifugal solvent temporary storage outlet;

[0049] 71-Drive mechanism, 72-Impurity removal inlet, 73-Impurity removal vessel body, 74-Stirring assembly, 75-Impurity removal material outlet, 76-Circulating water inlet pipe, 77-Filter cake feeding port, 78-Impurity removal gas outlet, 79-Circulating water outlet pipe;

[0050] 101-Single cone dryer shell, 102-Single cone feed inlet, 103-Vent outlet, 104-Hot water inlet for drying, 105-Single cone discharge outlet, 106-Hot water outlet for drying. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0053] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0054] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0055] Example 1

[0056] like Figures 1 to 6 As shown, this embodiment provides a system for purifying crude diaminobutene dinitrile, including a crystallization centrifuge assembly, a purification centrifuge assembly, and a crude product dryer 10 arranged sequentially.

[0057] The crystallization centrifuge assembly includes a crude crystallization tank 2, a first centrifuge 3 connected to the discharge port at the bottom of the crude crystallization tank 2, a crystallization condenser 1 connected to the air outlet at the top of the crude crystallization tank 2, and a centrifugal solvent storage tank 4 connected to the liquid outlet of the first centrifuge 3.

[0058] The impurity removal centrifuge assembly includes a reflux impurity removal vessel 7 connected to the discharge port of the first centrifuge 3, a second centrifuge 8 connected to the material outlet of the reflux impurity removal vessel 7, a reflux condenser 5 connected to the air outlet of the reflux impurity removal vessel 7, an impurity removal solvent metering tank 6 connected to the reflux impurity removal vessel 7, and an impurity removal solvent temporary storage tank 9 connected to the liquid outlet of the second centrifuge 8.

[0059] The crude product dryer 10 is connected to the discharge port of the second centrifuge 8.

[0060] The crude crystallization tank 2 includes a tank body, a crystallization material inlet 22 located at the top of the tank body, a crystallization gas outlet 29 located at the top of the tank body, a crystallization material outlet 26 located at the bottom of the tank body, a stirring mechanism 25 located inside the tank body, and a drive motor 21 located at the top of the tank body to drive the stirring mechanism 25 to rotate. The tank body includes an inner shell 23 and an outer shell 24, which form a temperature control cavity. The outer shell 24 is provided with a chilled water inlet pipe 27 and a chilled water outlet pipe 28 that communicate with the inside of the temperature control cavity.

[0061] The crystallization condenser 1 includes a condenser body, a condensation inlet located at one end of the condenser body and connected to the crystallization outlet 29, and a condensation outlet located at the other end of the condenser body and connected to the atmosphere.

[0062] The first centrifuge 3 includes a centrifuge body 31, a centrifuge inlet 34 disposed at the top of the centrifuge body 31, a centrifuge outlet 32 ​​disposed at the bottom of the centrifuge body 31, and a centrifuge liquid outlet 33 disposed at the bottom of the side wall of the centrifuge body 31.

[0063] The centrifugal feed inlet 34 is connected to the crystallized material outlet 26 and the demineralized water main pipe 35, respectively.

[0064] Centrifugal discharge port 32 is connected to reflux impurity removal vessel 7;

[0065] The centrifuge outlet is connected to the centrifuge solvent storage tank 4 and the wash water storage tank pipeline 36, and the wash water storage tank pipeline 36 is connected to the top of the crude product crystallization tank 2.

[0066] The centrifugal solvent storage tank 4 includes a centrifugal solvent storage shell 43, a centrifugal solvent storage outlet 44 located at the bottom of the centrifugal solvent storage shell 43, a centrifugal solvent storage inlet 41 located at the top of the centrifugal solvent storage shell 43, and a centrifugal solvent storage vent 42 located at the top of the centrifugal solvent storage shell 43.

[0067] The structure of the reflux condenser 5 is the same as that of the crystallization condenser 1.

[0068] The reflux impurity removal vessel 7 includes an impurity removal vessel body 73, a filter cake feeding port 77, an impurity removal air outlet 78, and an impurity removal liquid inlet 72, all located at the top of the impurity removal vessel body 73, an impurity removal material liquid outlet 75 located at the bottom of the impurity removal vessel body 73, a stirring assembly 74 located inside the impurity removal vessel body 73, and a drive mechanism 71 located at the top outside the impurity removal vessel body 73 to drive the stirring assembly 74 to rotate.

[0069] The impurity removal inlet is connected to the impurity removal solvent metering tank 6;

[0070] The impurity removal outlet 78 is connected to the reflux condenser 5;

[0071] The filter cake feeding port 77 is connected to the centrifugal discharge port 32;

[0072] The outlet 75 for the purified material is connected to the second centrifuge 8;

[0073] The impurity removal vessel body 73 is a double-layer shell, which forms a temperature control cavity. The double-layer shell is provided with a circulating water inlet pipe 76 and a circulating water outlet pipe 79 that communicate with the inside of the temperature control cavity. It is also provided with a low-pressure steam inlet and a steam condensate outlet that communicate with the inside of the temperature control cavity.

[0074] The structure of the second centrifuge 8 is the same as that of the first centrifuge 3. The centrifugal feed inlet 34 of the second centrifuge 8 is connected to the liquid outlet 75 of the impurity removed material and the metering tank 6 of the impurity removed solvent, respectively.

[0075] The centrifuge outlet of the second centrifuge 8 is connected to the impurity removal solvent storage tank 9 and the demineralized water rinsing pipeline, respectively.

[0076] The centrifuge outlet 32 ​​of the second centrifuge 8 is connected to the crude product dryer 10;

[0077] The structure of the impurity removal solvent metering tank 6 is the same as that of the centrifugal solvent temporary storage tank 4.

[0078] The crude product dryer 10 includes a single cone dryer housing 101, a single cone feed inlet 102 disposed at the top of the single cone dryer housing 101, and a single cone discharge outlet 105 disposed at the bottom of the single cone dryer housing 101, and also includes a vent outlet 103 disposed at the top of the single cone dryer housing 101.

[0079] The single cone dryer housing 101 is equipped with a material spiral rotation heating assembly with a heating chamber inside. The single cone dryer housing 101 is equipped with a drying hot water inlet 104 and a drying hot water outlet 106 that are connected to the heating chamber.

Claims

1. A system for purifying crude diaminobutene dinitrile, characterized in that, It includes a crystallization centrifuge assembly, a purification centrifuge assembly, and a crude product dryer (10) arranged in sequence; The crystallization centrifuge assembly includes a crude crystallization tank (2), a first centrifuge (3) connected to the discharge port at the bottom of the crude crystallization tank (2), a crystallization condenser (1) connected to the air outlet at the top of the crude crystallization tank (2), and a centrifugal solvent storage tank (4) connected to the liquid outlet of the first centrifuge (3). The impurity removal centrifuge assembly includes a reflux impurity removal vessel (7) connected to the discharge port of the first centrifuge (3), a second centrifuge (8) connected to the material outlet of the reflux impurity removal vessel (7), a reflux condenser (5) connected to the gas outlet of the reflux impurity removal vessel (7), an impurity removal solvent metering tank (6) connected to the reflux impurity removal vessel (7), and an impurity removal solvent temporary storage tank (9) connected to the liquid outlet of the second centrifuge (8). The crude product dryer (10) is connected to the discharge port of the second centrifuge (8).

2. The system for purifying crude diaminobutyronitrile according to claim 1, characterized in that, The crude crystallization tank (2) includes a tank body, a crystallization material inlet (22) located at the top of the tank body, a crystallization gas outlet (29) located at the top of the tank body, a crystallization material outlet (26) located at the bottom of the tank body, a stirring mechanism (25) located inside the tank body, and a drive motor (21) located at the top of the tank body to drive the stirring mechanism (25) to rotate. The tank body includes an inner shell (23) and an outer shell (24). The inner shell (23) and the outer shell (24) form a temperature control cavity. The outer shell (24) is provided with a chilled water inlet pipe (27) and a chilled water outlet pipe (28) communicating with the inside of the temperature control cavity.

3. The system for purifying crude diaminobutene dinitrile according to claim 2, characterized in that, The crystallization condenser (1) includes a condenser body, a condensation inlet located at one end of the condenser body and connected to the crystallization outlet (29), and a condensation outlet located at the other end of the condenser body and connected to the atmosphere.

4. The system for purifying crude diaminobutene dinitrile according to claim 3, characterized in that, The first centrifuge (3) includes a centrifuge body (31), a centrifuge feed port (34) disposed on the top of the centrifuge body (31), a centrifuge discharge port (32) disposed on the bottom of the centrifuge body (31), and a centrifuge liquid outlet (33) disposed on the bottom of the side wall of the centrifuge body (31); The centrifugal feed inlet (34) is connected to the liquid outlet (26) of the crystallized material and the demineralized water main pipe (35), respectively; The centrifugal discharge port (32) is connected to the reflux impurity removal vessel (7); The centrifuge outlet is connected to the centrifuge solvent storage tank (4) and the washing water storage tank pipeline (36), and the washing water storage tank pipeline (36) is connected to the top of the crude product crystallization tank (2).

5. The system for purifying crude diaminobutene dinitrile according to claim 4, characterized in that, The centrifugal solvent storage tank (4) includes a centrifugal solvent storage shell (43), a centrifugal solvent storage outlet (44) located at the bottom of the centrifugal solvent storage shell (43), a centrifugal solvent storage inlet (41) located at the top of the centrifugal solvent storage shell (43), and a centrifugal solvent storage vent (42) located at the top of the centrifugal solvent storage shell (43).

6. The system for purifying crude diaminobutene dinitrile according to claim 3, characterized in that, The structure of the reflux condenser (5) is the same as that of the crystallization condenser (1).

7. The system for purifying crude diaminobutene dinitrile according to claim 5, characterized in that, The reflux impurity removal kettle (7) includes an impurity removal kettle body (73), a filter cake feeding port (77), an impurity removal air outlet (78), and an impurity removal liquid inlet (72) all disposed on the top of the impurity removal kettle body (73), an impurity removal material liquid outlet (75) disposed on the bottom of the impurity removal kettle body (73), a stirring assembly (74) disposed inside the impurity removal kettle body (73), and a drive mechanism (71) disposed on the top outside the impurity removal kettle body (73) to drive the stirring assembly (74) to rotate; The impurity removal inlet is connected to the impurity removal solvent metering tank (6); The impurity removal outlet (78) is connected to the reflux condenser (5); The filter cake feeding port (77) is connected to the centrifugal discharge port (32); The impurity removal material outlet (75) is connected to the second centrifuge (8); The impurity removal vessel body (73) is a double-layer shell, which forms a temperature control cavity. The double-layer shell is provided with a circulating water inlet pipe (76) and a circulating water outlet pipe (79) that communicate with the inside of the temperature control cavity. It is also provided with a low-pressure steam inlet and a steam condensate outlet that communicate with the inside of the temperature control cavity.

8. The system for purifying crude diaminobutyronitrile according to claim 7, characterized in that, The structure of the second centrifuge (8) is the same as that of the first centrifuge (3). The centrifuge inlet (34) of the second centrifuge (8) is connected to the liquid outlet (75) of the impurity removal material and the demineralized water rinsing pipe, respectively. The centrifuge outlet of the second centrifuge (8) is connected to the pipeline (36) of the impurity removal solvent storage tank (9) and the washing water storage tank, respectively; The centrifugal outlet (32) of the second centrifuge (8) is connected to the crude product dryer (10); The structure of the impurity removal solvent metering tank (6) is the same as that of the centrifugal solvent temporary storage tank (4).

9. The system for purifying crude diaminobutene dinitrile according to claim 8, characterized in that, The crude product dryer (10) includes a single cone dryer housing (101), a single cone feed inlet (102) disposed at the top of the single cone dryer housing (101), and a single cone discharge outlet (105) disposed at the bottom of the single cone dryer housing (101), and also includes an vent outlet (103) disposed at the top of the single cone dryer housing (101).

10. The system for purifying crude diaminobutene dinitrile according to claim 9, characterized in that, The single cone dryer housing (101) is provided with a material spiral rotation heating assembly with a heating chamber inside. The single cone dryer housing (101) is provided with a drying hot water inlet (104) and a drying hot water outlet (106) communicating with the heating chamber.

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