Acrylonitrile catalyst cleaning solution recycling system

Abstract

The utility model relates to the technical field of catalyst preparation, and discloses an acrylonitrile catalyst cleaning solution recycling system, which comprises a separation device, an acrylonitrile catalyst recycling device and a recycling device, the separation device comprises a separation kettle, a cleaning solution is separated into a catalyst concentrated solution and cleaning solution steam in the separation kettle, and the catalyst concentrated solution and the cleaning solution steam are respectively discharged through a catalyst concentrated solution output end and a cleaning solution steam output end; the catalyst recycling device is used for uniformly dispersing the catalyst concentrated solution into a catalyst recycling solution and discharging the catalyst recycling solution through a catalyst recycling solution output end; the cleaning solution recycling device is used for cooling the cleaning solution steam into the cleaning solution; and the slurry preparation device is communicated with the catalyst recovery liquid output end and can be used for preparing catalyst slurry by using the catalyst recovery liquid. According to the technical scheme, the catalyst in the cleaning solution is recycled and reutilized, so that the production cost is reduced, and environmental pollution caused by direct emission is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to catalyst preparation technical field, specifically to a kind of acrylonitrile catalyst cleaning fluid recycling system. BACKGROUND

[0002] The slurry of acrylonitrile catalyst is often adhered with more slurry in reaction kettle and pipeline during preparation due to large viscosity, and these slurry will dry up and block valves and pipelines after water evaporation due to high temperature, so flushing is needed. The cleaning fluid produced after flushing of reaction kettle and pipeline is treated as waste water, and since acrylonitrile catalyst raw material is expensive and complex in composition, cleaning fluid discharge will cause material loss and pollution to ecological environment. SUMMARY

[0003] The utility model discloses a kind of acrylonitrile catalyst cleaning fluid recycling systems to overcome the problems of the prior art that cleaning fluid produced after preparation of the slurry of acrylonitrile catalyst is discharged as waste water, causing material loss and pollution to ecological environment.

[0004] To achieve the above object, the utility model provides a kind of acrylonitrile catalyst cleaning fluid recycling system, comprising:

[0005] Separation device, separation device includes separation kettle, separation kettle is housed with cleaning fluid, and cleaning fluid is separated into catalyst concentrate and clean liquid vapor in separation kettle and is discharged through catalyst concentrate output end and clean liquid vapor output end respectively;

[0006] Catalyst recycling device, catalyst recycling device is communicated with catalyst concentrate output end, for uniformly dispersing catalyst concentrate into catalyst recovery liquid and discharging through catalyst recovery liquid output end;

[0007] Clean liquid recycling device, clean liquid recycling device is communicated with clean liquid vapor output end, for cooling clean liquid vapor into clean liquid;And,

[0008] Slurry preparation device, slurry preparation device is communicated with catalyst recovery liquid output end, and catalyst recovery liquid can be used to prepare catalyst slurry.

[0009] In some embodiments, the separation device further comprises a heater and a gas-liquid separator, the heater is used to heat the cleaning fluid in the separation kettle, and the gas-liquid separator is arranged upstream of the clean liquid vapor output end. The gas-liquid separator can separate and return the liquid phase contained in the clean liquid vapor produced by the separation kettle to the separation kettle.

[0010] In some embodiments, a first solid content analyzer is further arranged on the separation kettle.

[0011] In some embodiments, the catalyst recycling device comprises a catalyst concentrate collection tank, a disperser and a catalyst recovery tank, the catalyst concentrate collection tank being connected between the catalyst concentrate output end and the disperser, and the catalyst recovery tank being connected between the disperser and the catalyst recovery liquid output end.

[0012] In some embodiments, the disperser is provided with a first particle size analyzer.

[0013] In some embodiments, a first filter is further arranged between the disperser and the catalyst recovery tank.

[0014] In some embodiments, the cleaning liquid recycling device comprises a cooling unit and a cleaning liquid recovery tank, the cooling unit being connected between the cleaning liquid vapor output end and the cleaning liquid recovery tank, and the cleaning liquid recovery tank being connected to the slurry preparation device through the cleaning liquid output end, so as to supply the cleaning liquid to the slurry preparation device.

[0015] In some embodiments, the cooling unit is a cleaning liquid collection tank, the cleaning liquid collection tank is provided with a jacket, the jacket is connected to the cleaning liquid vapor output end and the cleaning liquid recovery tank respectively, and the tank body of the cleaning liquid collection tank contains cleaning liquid and is connected to the separation tank to supply the cleaning liquid to the separation tank.

[0016] In some embodiments, the cooling unit and the cleaning liquid recovery tank are sequentially connected with a cleaning liquid collection tank and a second filter.

[0017] In some embodiments, the slurry preparation device comprises a catalyst preparation tank, and the catalyst preparation tank is further provided with a second solid content analyzer and a second particle size analyzer.

[0018] According to the above technical scheme, the acrylonitrile catalyst cleaning liquid is separated into cleaning liquid vapor and catalyst concentrate in the reaction kettle, the catalyst concentrate is uniformly dispersed into catalyst recovery liquid in the catalyst recycling device, the cleaning liquid vapor is cooled into cleaning liquid in the cleaning recycling device, and the catalyst recovery liquid can be used to prepare catalyst slurry for reuse in the slurry preparation device, so that the catalyst in the cleaning liquid is recycled and reused, the production cost is reduced, and the pollution to the environment caused by direct discharge is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the overall view of the acrylonitrile catalyst cleaning liquid recycling system according to the embodiments of the present application.

[0020] REFERENCE SIGNS

[0021] 1, cleaning liquid collection kettle; 2, separation kettle; 3, heater; 4, gas-liquid separator; 5, catalyst concentrated liquid collection kettle; 6, disperser; 7a, first filter; 7b, second filter; 8, catalyst recovery tank; 9, cleaning liquid collection kettle; 10, cleaning liquid recovery tank; 11a, first solid content analyzer; 11b, second solid content analyzer; 12, catalyst preparation tank; 13a, first particle size analyzer; 13b, second particle size analyzer. DETAILED DESCRIPTION

[0022] In the present application, unless otherwise stated, the orientation words such as "up", "down", "left", "right", "in", "out" and the like used to indicate the orientation or position relationship are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0023] After the preparation of the acrylonitrile catalyst slurry, water is generally used as a cleaning liquid to flush the reaction kettle and the pipeline to obtain a cleaning liquid. In order to solve the problem that the cleaning liquid generated after the preparation of the acrylonitrile catalyst slurry is discharged as waste water in the prior art, causing material loss and pollution to the ecological environment, the present application provides an acrylonitrile catalyst cleaning liquid recycling system, as shown in Figure 1 The separation device includes a separation kettle 2, and the separation kettle 2 contains a cleaning liquid. The cleaning liquid is separated into catalyst concentrated liquid and cleaning liquid vapor in the separation kettle 2 and is discharged through a catalyst concentrated liquid output end and a cleaning liquid vapor output end, respectively. The catalyst recycling device is in communication with the catalyst concentrated liquid output end and is used to uniformly disperse the catalyst concentrated liquid into catalyst recovery liquid and discharge the catalyst recovery liquid through a catalyst recovery liquid output end. The cleaning liquid recycling device is in communication with the cleaning liquid vapor output end and is used to cool the cleaning liquid vapor into cleaning liquid. The slurry preparation device is in communication with the catalyst recovery liquid output end and can use the catalyst recovery liquid to prepare catalyst slurry. Through the above-mentioned acrylonitrile catalyst cleaning liquid recycling system, the catalyst in the cleaning liquid is recycled twice and made into catalyst slurry for production, which reduces the production cost and avoids pollution to the environment caused by the discharge of the cleaning liquid.

[0024] In some embodiments, the separation device further includes a heater 3 and a gas-liquid separator 4. The heater 3 is used to heat the cleaning liquid in the separation kettle 2, Figure 1The cleaning liquid in the separation kettle 2 is heated in the heater 3 and then fed back into the separation kettle 2. Alternatively, the separation kettle 2 can be provided with a jacket, and heating steam is fed into the jacket, or an electric heating wire is directly arranged in the separation kettle 2. The gas-liquid separator 4 is arranged upstream of the cleaning liquid vapor outlet. The gas-liquid separator 4 can separate the liquid phase contained in the cleaning liquid vapor generated by the separation kettle 2 and return the liquid phase to the separation kettle 2, while the cleaning liquid vapor is supplied to the cleaning liquid recycling device. Alternatively, the gas-liquid separator 4 can be omitted, and the cleaning liquid vapor generated by the separation kettle 2 is directly supplied to the cleaning liquid recycling device through the cleaning liquid vapor outlet.

[0025] In some embodiments, the separation kettle 2 is further provided with a first solid content analyzer 11a for detecting the solid content of the cleaning liquid in the separation kettle 2. A sampling port of the separation kettle 2 is connected to the first solid content analyzer 11a. When the solid content reaches a set value, the heating is stopped, and the catalyst concentrate is prepared. The catalyst concentrate is supplied to the catalyst recycling device.

[0026] In some embodiments, as shown in Figure 1 the catalyst recycling device includes a catalyst concentrate collection kettle 5, a disperser 6, and a catalyst recovery tank 8. The catalyst concentrate collection kettle 5 is connected between the catalyst concentrate outlet and the disperser 6, and the catalyst recovery tank 8 is connected between the disperser 6 and the catalyst recovery liquid outlet. The catalyst concentrate in the catalyst concentrate collection kettle 5 is fed into the disperser 6, and the catalyst concentrate is uniformly dispersed to prepare the catalyst recovery liquid, which is contained in the catalyst recovery tank 8. The disperser 6 is preferably an ultrasonic disperser. Alternatively, other dispersers in the prior art can be used, such as a stirrer. Any disperser that can uniformly disperse the catalyst in the catalyst concentrate can be used.

[0027] In some embodiments, as shown in Figure 1 the disperser 6 is provided with a first particle size analyzer 13a. A sampling port of the disperser 6 is connected to the first particle size analyzer 13a. The first particle size analyzer 13a is used to detect the particle size of the catalyst in the catalyst concentrate in the disperser 6. When the average particle size reaches a set value, the dispersion is stopped, and the catalyst recovery liquid is prepared.

[0028] In some embodiments, as shown in Figure 1 the disperser 6 and the catalyst recovery tank 8 are further provided with a first filter 7a. Since the particle size of the catalyst detected by the first particle size analyzer 13a is an average value, the first filter 7a is arranged to screen out catalyst particles with excessively large particle sizes.

[0029] In some embodiments, as shown in Figure 1As shown, the cleaning liquid recycling device comprises a cooling unit and a cleaning liquid recovery tank 10, the cooling unit is connected between the cleaning liquid vapor output end and the cleaning liquid recovery tank 10 to cool the cleaning liquid vapor into liquid cleaning liquid. The cleaning liquid recovery tank 10 is connected to the slurry preparation device through a cleaning liquid output end to supply the cleaning liquid to the slurry preparation device to realize the recycling of the cleaning liquid in the cleaning liquid.

[0030] In some embodiments, as shown in Figure 1 The cooling unit is a cleaning liquid collection kettle 1, the cleaning liquid collection kettle 1 is provided with a jacket, the jacket is respectively connected to the cleaning liquid vapor output end and the cleaning liquid recovery tank 10, and the kettle body of the cleaning liquid collection kettle 1 contains cleaning liquid and is connected to the separation kettle 2 to supply cleaning liquid to the separation kettle 2. The cleaning liquid vapor in the jacket preheats the cleaning liquid in the kettle body of the cleaning liquid collection kettle 1, and the temperature is reduced to form liquid cleaning liquid, which enters the cleaning liquid recovery tank 10. The cleaning liquid in the kettle body of the cleaning liquid collection kettle 1 is preheated by the cleaning liquid vapor, and after entering the separation kettle 2, the energy consumption for heating the cleaning liquid can be reduced. Of course, the cooling unit can also be set as a condenser in the prior art, which is connected between the cleaning liquid vapor output end and the cleaning liquid recovery tank 10 to condense the cleaning liquid vapor into liquid cleaning liquid without preheating the cleaning liquid.

[0031] In some embodiments, as shown in Figure 1 To prevent other particulate matters in the cleaning liquid during the cooling process, such as impurities remaining due to incomplete pipeline cleaning, etc., the cleaning liquid collection kettle 9 and the second filter 7b are sequentially connected between the cooling unit and the cleaning liquid recovery tank 10, the cooled cleaning liquid is collected in the cleaning liquid collection kettle 9, and then the second filter 7b is used to filter out the particulate matters before entering the cleaning liquid recovery tank 10.

[0032] In some embodiments, as shown in Figure 1 The slurry preparation device comprises a catalyst preparation tank 12, the catalyst recovery liquid enters the catalyst preparation tank 12, and the catalyst preparation tank 12 is used to prepare the catalyst slurry which can be directly used. The catalyst preparation tank 12 is also provided with a second solid content analyzer 11b and a second particle size analyzer 13b, and the sampling port of the catalyst preparation tank 12 is connected to the second solid content analyzer 11b and the second particle size analyzer 13b. The second solid content analyzer 11b is used to detect the solid content of the prepared catalyst slurry, and the second particle size analyzer 13b is used to detect the average particle size of the prepared catalyst slurry. When the set value is reached, the blending is completed, the acrylonitrile catalyst slurry is prepared for production, and thus the recycling of the acrylonitrile catalyst from the acrylonitrile catalyst cleaning liquid and the use for production are completed. Figure 1The cleaning liquid recycling device is connected with the catalyst preparation tank 12, and the cleaning liquid recycled by the cleaning liquid recycling device is used for preparing catalyst slurry, and the cleaning liquid in the cleaning liquid is also recycled. Of course, the cleaning liquid recycled by the cleaning liquid recycling device can not be used, and fresh cleaning liquid and catalyst slurry are directly introduced into the catalyst preparation tank 12.

[0033] The use process of the entire acrylonitrile catalyst cleaning liquid recycling system can include the following steps: collecting the cleaning liquid into the cleaning liquid collecting tank 1, the cleaning liquid entering the separation tank 2 from the cleaning liquid collecting tank 1, the cleaning liquid in the separation tank 2 entering the heater 3 for heating and returning to the separation tank 2, and so on. The cleaning liquid is heated and evaporated to separate into cleaning liquid vapor and catalyst concentrate, the cleaning liquid vapor enters the gas-liquid separator 4, the liquid phase in the cleaning liquid vapor flows back to the separation tank 2, and the separated cleaning liquid vapor enters the jacket of the cleaning liquid collecting tank 1 to preheat the cleaning liquid in the tank body of the cleaning liquid collecting tank 1. The first solid content analyzer 11a on the separation tank 2 analyzes the solid content of the cleaning liquid in the separation tank 2, the heater 3 stops heating when the set value is reached, and the catalyst concentrate is prepared. The catalyst concentrate is transferred to the catalyst concentrate collecting tank 5. The catalyst concentrate in the catalyst concentrate collecting tank 5 is transferred to the disperser 6 for dispersion, the first particle size analyzer 13a on the disperser 6 detects the particle size of the catalyst concentrate, the disperser 6 stops dispersing when the set value is reached, and the catalyst recovery liquid is prepared. The catalyst recovery liquid in the disperser 6 enters the catalyst recovery tank 8 after removing large particles by the first filter 7a, and the catalyst recovery liquid is prepared, and the recovery of the catalyst is completed. The cleaning liquid vapor in the jacket of the cleaning liquid collecting tank 1 is cooled to liquid cleaning liquid after the temperature is reduced, enters the cleaning liquid collecting tank 9, and enters the cleaning liquid recovery tank 10 after removing particles by the second filter 7b, and the recovery of the cleaning liquid is completed. The catalyst recovery liquid in the catalyst recovery tank 8 and the cleaning liquid in the cleaning liquid recovery tank 10 are mixed in the catalyst preparation tank 12, and fresh cleaning liquid and catalyst slurry are introduced, and are mixed in the catalyst preparation tank 12. The second solid content analyzer 11b and the second particle size analyzer 13b detect the solid content and the average particle size to reach the set value, the preparation of the catalyst slurry is completed, and the acrylonitrile catalyst slurry is prepared for production.

[0034] The preferred embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present application will not be described again. However, these simple modifications and combinations should also be regarded as disclosed content of the present application, and all belong to the protection scope of the present application.

Claims

1. A system for recycling acrylonitrile catalyst purge liquid, characterized by, The application relates to a catalyst slurry preparation device and a method for preparing catalyst slurry. The application comprises: a separation device, which comprises a separation kettle (2) containing a washing liquid, the washing liquid being separated into catalyst concentrated liquid and cleaning liquid vapor in the separation kettle (2) and being discharged through a catalyst concentrated liquid outlet and a cleaning liquid vapor outlet respectively; a catalyst recycling device, which is communicated with the catalyst concentrated liquid outlet and is used for uniformly dispersing the catalyst concentrated liquid into catalyst recovery liquid and discharging the catalyst recovery liquid through a catalyst recovery liquid outlet; a cleaning liquid recycling device, which is communicated with the cleaning liquid vapor outlet and is used for cooling the cleaning liquid vapor into cleaning liquid; and 2. The acrylonitrile catalyst purge solution recycling system of claim 1, wherein, a slurry preparation device, which is communicated with the catalyst recovery liquid outlet and can prepare catalyst slurry by using the catalyst recovery liquid.

3. The acrylonitrile catalyst purge solution recycling system of claim 2, wherein, The separation device further comprises a heater (3) for heating the washing liquid in the separation kettle (2) and a gas-liquid separator (4) arranged upstream of the cleaning liquid vapor outlet, the gas-liquid separator (4) can separate the liquid phase contained in the cleaning liquid vapor generated by the separation kettle (2) and return the liquid phase to the separation kettle (2).

4. The acrylonitrile catalyst purge solution recycling system of claim 1, wherein, A first solid content analyzer (11a) is further arranged on the separation kettle (2).

5. The acrylonitrile catalyst purge solution recycling system of claim 4, wherein, The catalyst recycling device comprises a catalyst concentrated liquid collecting kettle (5) communicated between the catalyst concentrated liquid outlet and a disperser (6), and a catalyst recovery tank (8) communicated between the disperser (6) and the catalyst recovery liquid outlet.

6. The acrylonitrile catalyst purge solution recycling system of claim 5, wherein, A first particle size analyzer (13a) is arranged on the disperser (6).

7. The acrylonitrile catalyst purge solution recycling system of claim 1, wherein, A first filter (7a) is further arranged between the disperser (6) and the catalyst recovery tank (8).

8. The acrylonitrile catalyst purge solution recycling system of claim 7, wherein, The cleaning liquid recycling device comprises a cooling unit communicated between the cleaning liquid vapor outlet and a cleaning liquid recovery tank (10), and the cleaning liquid recovery tank (10) is communicated to the slurry preparation device through a cleaning liquid outlet to supply the cleaning liquid to the slurry preparation device.

9. The acrylonitrile catalyst purge solution recycling system of claim 7, wherein, The cooling unit is a washing liquid collecting kettle (1), a jacket of which is communicated with the cleaning liquid vapor outlet and the cleaning liquid recovery tank (10) respectively, and a kettle body of the washing liquid collecting kettle (1) contains the washing liquid and is communicated with the separation kettle (2) to supply the washing liquid to the separation kettle (2).

10. The acrylonitrile catalyst purge solution recycling system of claim 1, wherein, A cleaning liquid collecting kettle (9) and a second filter (7b) are sequentially connected between the cooling unit and the cleaning liquid recovery tank (10). The slurry preparation device comprises a catalyst preparation tank (12), and a second solid content analyzer (11b) and a second particle size analyzer (13b) are further arranged on the catalyst preparation tank (12).

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