Method for improving effect of removing solvent in chlorosulfonated polyethylene solution by wet process

Abstract

The invention belongs to the technical field of chlorosulfonated polyethylene wet condensation extrusion post-treatment, and particularly relates to a method for improving the effect of removing a solvent in a chlorosulfonated polyethylene solution by a wet process, which comprises a condensation kettle and is characterized in that a mixed fluid of the chlorosulfonated polyethylene solution ejected by a 1 # nozzle and hot water and a low-pressure steam flow ejected by a 2 # nozzle are injected into the condensation kettle; and the fluid is converged to a fluid collision point A on a stirring plane of the stirrer. According to the method, the solvent removal effect can be improved, the content of the solvent in wet glue particles is stably kept below an allowable value, and the problems that equipment is blocked by wet glue blocks and the extrusion devolatilization effect is affected due to the poor solvent removal effect are effectively prevented; the device has the advantages of small equipment change, simple structure, easiness in operation and the like, prolongs the stable production time of an after-treatment system after implementation, reduces the construction times for treating blocked equipment, and reduces the production cost and the labor intensity.

Description

Technical Field

[0001] The present invention belongs to the technical field of post-treatment of chlorosulfonated polyethylene wet coagulation extrusion, and particularly relates to a method for improving the effect of removing solvents from chlorosulfonated polyethylene solution by wet method. Background Art

[0002] Chlorosulfonated polyethylene rubber has excellent oil resistance and weather resistance and is widely used in industrial rubber hoses, automobiles and other fields. At present, the post-treatment methods for producing chlorosulfonated polyethylene by the solvent method mainly include two types: wet method and dry method. Among them, the wet method is to use hot water to azeotrope with the solvent in the chlorosulfonated polyethylene solution and remove the solvent by steam stripping. In the coagulation kettle, the chlorosulfonated polyethylene solution and hot water are pre-mixed and then enter the kettle body 6 filled with hot water from the 1# nozzle 1, and low-pressure steam enters the kettle body 6 from the 2# nozzle 2. The hot water in the kettle is continuously heated. Under the azeotropic action of hot water and the stirring action of the stirrer 3, the solvent in the chlorosulfonated polyethylene solution and chlorosulfonated polyethylene are separated. The solvent azeotropes with steam and hot water to become a mixed gas and then rises and is discharged from the top exhaust port 5 of the kettle body 6. After the chlorosulfonated polyethylene precipitates from the solution, it agglomerates into wet rubber (chlorosulfonated polyethylene containing 40-50% water) particles, and overflows with the hot water from the overflow port 4 and is discharged from the kettle body 6, finally realizing the removal of the solvent in the chlorosulfonated polyethylene solution, such as Figure 2 .

[0003] During the production process, the removal effect of the solvent is uncontrollable, and the chlorosulfonated polyethylene wet rubber particles often contain a large amount of solvent. On the one hand, the wet rubber containing a large amount of solvent is easy to agglomerate in the equipment, causing blockage of the overflow port 4 and affecting the normal operation of the post-treatment system. On the other hand, too much solvent in the wet rubber will affect the effect of extrusion and devolatilization in the next process. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for improving the effect of removing solvents from chlorosulfonated polyethylene solution by wet method, improve the removal effect of the solvent in the chlorosulfonated polyethylene solution, ensure that the solvent content in the chlorosulfonated polyethylene wet rubber particles is below the allowable value, and prevent problems such as wet rubber agglomeration and affecting the extrusion and devolatilization effect caused by too much solvent in the wet rubber.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] Method for improving the effect of removing solvents from chlorosulfonated polyethylene solution by wet process, including a coagulation kettle, which includes a No. 1 nozzle, a No. 2 nozzle, a stirrer, an overflow port, a top exhaust port and a kettle body. The side of the kettle body is provided with a No. 1 nozzle and an overflow port, the bottom is provided with a No. 2 nozzle, the middle is provided with a stirrer, and the top is provided with a top exhaust port. It is characterized in that: during operation, water is added into the kettle body from the No. 1 nozzle. When the water in the kettle body reaches 2 / 3 of the liquid level, low-pressure steam at 130°C - 170°C is added into the kettle body from the No. 2 nozzle; the water in the kettle body is heated. When the water temperature reaches 85°C - 95°C, a premixed solution of chlorosulfonated polyethylene and hot water is added into the kettle body from the No. 1 nozzle; the mixed liquid flow of the chlorosulfonated polyethylene solution and hot water ejected from the No. 1 nozzle intersects with the low-pressure steam flow ejected from the No. 2 nozzle at the fluid collision point A on the stirring plane formed by the stirrer; the solvent in the chlorosulfonated polyethylene solution forms an azeotrope after colliding with the steam and hot water, becomes a mixed gas and continuously rises, and is discharged from the top exhaust port; the chlorosulfonated polyethylene in the chlorosulfonated polyethylene solution precipitates from the solution, and under the action of fluid impact and stirring, forms chlorosulfonated polyethylene wet glue particles with uniform particles and containing 40% - 50% water, and is discharged from the overflow port along with the overflowing hot water.

[0007] The hot water temperature in the coagulation kettle is 89°C - 92°C, the flow rate of the chlorosulfonated polyethylene solution is 1000 kg / h - 3000 kg / h, the premixing ratio of the chlorosulfonated polyethylene solution and hot water is 1:4, and the stirring speed is 80 revolutions per minute - 150 revolutions per minute

[0008] The No. 1 nozzle forms an angle of 45° with the stirring plane of the stirrer.

[0009] There are 2 - 4 No. 1 nozzles, which are evenly distributed around the stirrer, and the nozzle aperture is Φ100mm.

[0010] The total flow rate of the mixed liquid flow of the chlorosulfonated polyethylene solution and hot water premixed by all the No. 1 nozzles is 5000 kg / h - 15000 kg / h.

[0011] The No. 2 nozzle forms an angle of 30° with the stirring plane of the stirrer.

[0012] There are 2 - 4 No. 2 nozzles, corresponding to each No. 1 nozzle, evenly distributed around the stirrer, and the nozzle aperture is Φ50mm.

[0013] The total flow rate of the low-pressure steam flow of all the No. 2 nozzles is 1000 kg / h - 2000 kg / h.

[0014] The mixed liquid flow of the chlorosulfonated polyethylene solution and hot water ejected from the No. 1 nozzle and the low-pressure steam flow ejected from the No. 2 nozzle meet at the fluid collision point A on the stirring plane formed by the stirrer, and the two liquid flows meet at an angle of 120°.

[0015] Advantages of the present invention:

[0016] The method for improving the effect of removing the solvent in the chlorosulfonated polyethylene solution by wet method of the present invention can improve the solvent removal effect, stably keep the solvent content in the chlorosulfonated polyethylene wet glue particles below the allowable value, and effectively prevent the problems of wet glue caking and blocking equipment and affecting the extrusion devolatilization effect caused by poor solvent removal effect; it has the advantages of small equipment modification, simple structure, easy operation, etc. After implementation, it prolongs the stable production time of the post-treatment system, reduces the construction times of dealing with blocked equipment, and reduces production costs and labor intensity. Description of the drawings

[0017] Figure 1 It is a schematic structural diagram of the coagulation kettle of the present invention.

[0018] Figure 2 For the present invention Figure 1 Side view.

[0019] Figure 3 It is a schematic structural diagram of the coagulation kettle of the wet coagulation post-treatment system of chlorosulfonated polyethylene in the prior art.

[0020] Figure 4 For the present invention Figure 3 Side view.

[0021] In the figure: 1. No. 1 nozzle, 2. No. 2 nozzle, 3. Stirrer, 4. Overflow port, 5. Top exhaust port, 6. Kettle body, A. Fluid collision point. Specific embodiments

[0022] The specific embodiments of the present invention will be further described below with reference to the drawings.

[0023] As Figure 1As shown in the figure, the method for improving the solvent removal effect of chlorosulfonated polyethylene solution by wet method in the present invention includes a coagulation kettle, which includes a No. 1 nozzle 1, a No. 2 nozzle 2, a stirrer 3, an overflow port 4, a top exhaust port 5 and a kettle body 6. The side of the kettle body 6 is provided with a No. 1 nozzle 1 and an overflow port 4, the bottom is provided with a No. 2 nozzle 2, a stirrer 3 is arranged in the middle, and a top exhaust port 5 is arranged at the top. It is characterized in that: during operation, water is added into the kettle body from the No. 1 nozzle. When the water in the kettle body 6 reaches 2 / 3 of the liquid level, low-pressure steam at 130°C - 170°C is added into the kettle body 6 from the No. 2 nozzle; the water in the kettle body 6 is heated. When the water temperature reaches 85°C - 95°C, a premixed chlorosulfonated polyethylene solution and hot water are added into the kettle body 6 from the No. 1 nozzle; the mixed liquid flow of the chlorosulfonated polyethylene solution and hot water ejected from the No. 1 nozzle and the low-pressure steam flow ejected from the No. 2 nozzle meet at the fluid collision point A on the stirring plane formed by the stirrer 3; the solvent in the chlorosulfonated polyethylene solution azeotropes with the steam and hot water after collision, becomes a mixed gas and continuously rises, and is discharged from the top exhaust port 5; the chlorosulfonated polyethylene in the chlorosulfonated polyethylene solution precipitates from the solution, and under the action of fluid impact and stirring, forms chlorosulfonated polyethylene wet glue particles with uniform particles containing 40% - 50% water, and is discharged from the overflow port 4 along with the overflowing hot water.

[0024] In the coagulation kettle, the temperature of the hot water is 89°C - 92°C, the flow rate of the chlorosulfonated polyethylene solution is 1000 kg / h - 3000 kg / h, the premixing ratio of the chlorosulfonated polyethylene solution and hot water is 1:4, and the stirring speed is 80 revolutions per minute - 150 revolutions per minute.

[0025] The No. 1 nozzle 1 forms an angle of 45° with the stirring plane. The No. 2 nozzle 2 forms an angle of 30° with the stirring plane of the stirrer 3. The mixed liquid flow of the chlorosulfonated polyethylene solution and hot water, the low-pressure steam flow and the stirring plane of the stirrer meet at the fluid collision point A in the coagulation kettle. The mixed liquid flow of the chlorosulfonated polyethylene solution and hot water and the low-pressure steam flow meet at an angle of 120°.

[0026] Refer to Figure 1 , this embodiment is a method for improving the solvent removal effect of chlorosulfonated polyethylene solution by wet method, which includes a coagulation kettle, and is characterized in that: the mixed fluid of the chlorosulfonated polyethylene solution and hot water ejected from the No. 1 nozzle 1 and the low-pressure steam flow ejected from the No. 2 nozzle 2 meet at the fluid collision point A on the stirring plane of the stirrer 3.

[0027] The structure of the coagulation kettle is as follows: It includes a No. 1 nozzle 1, a No. 2 nozzle 2, a stirrer 3, an overflow port 4, a top exhaust port 5, and a kettle body 6. The side of the kettle body 6 is provided with the No. 1 nozzle 1 and the overflow port 4, the bottom is provided with the No. 2 nozzle 2, the stirrer 3 is arranged in the middle, and the top exhaust port 5 is arranged at the top.

[0028] During operation, water is added into the kettle body 6 from the No. 1 nozzle. When the water in the kettle body 6 reaches the 2 / 3 liquid level, low-pressure steam at 180°C - 220°C is added into the kettle body 6 from the No. 2 nozzle; the water in the kettle body 6 is heated. When the water temperature reaches 85°C - 95°C, a premixed chlorosulfonated polyethylene solution and hot water are added into the kettle body 6 from the No. 1 nozzle; the mixed liquid flow of the chlorosulfonated polyethylene solution and hot water ejected from the No. 1 nozzle intersects with the low-pressure steam flow ejected from the No. 2 nozzle at the fluid collision point A on the stirring plane formed by the stirrer 3; the solvent in the chlorosulfonated polyethylene solution azeotropes after colliding with the steam and hot water, becomes a mixed gas and continuously rises, and is discharged from the top exhaust port 5; the chlorosulfonated polyethylene in the chlorosulfonated polyethylene solution precipitates from the solution, and under the action of fluid impact and stirring, forms chlorosulfonated polyethylene wet glue particles with uniform particles and containing 40% - 50% water, and is discharged from the overflow port along with the overflowing hot water.

[0029] The chlorosulfonated polyethylene wet glue particles discharged from the coagulation kettle in this embodiment are small and have uniform particles, no large pieces of glue are formed, and the solvent content in the wet glue particles is below the specified value. At the same time, the overflow port is not easily blocked, and the coagulation kettle operates more stably.

[0030] This method for removing the solvent from the chlorosulfonated polyethylene solution can improve the solvent removal effect, stably keep the solvent content in the wet glue below the allowable value, and effectively prevent the problems of wet glue caking and blocking the equipment and affecting the extrusion devolatilization effect caused by poor solvent removal effect. It has the advantages of small equipment modification, simple structure, easy operation, etc. After implementation, it prolongs the stable production time of the post-treatment system, reduces the construction times of dealing with blocked equipment, and reduces production costs and labor intensity.

Claims

1. A method for improving the solvent removal effect in a chlorosulfonated polyethylene solution by wet process, including a coagulation kettle, which comprises a No. 1 nozzle, a No. 2 nozzle, a stirrer, an overflow port, a top exhaust port and a kettle body. The side of the kettle body is provided with a No. 1 nozzle and an overflow port, the bottom is provided with a No. 2 nozzle, a stirrer is arranged in the middle, and a top exhaust port is arranged at the top. It is characterized in that: During operation, water is added into the kettle body from the 1# nozzle. When the water level in the kettle body reaches 2 / 3, low-pressure steam at 130°C - 170°C is added into the kettle body from the 2# nozzle; the water in the kettle body is heated. When the water temperature reaches 85°C - 95°C, a premixed solution of chlorosulfonated polyethylene and hot water is added into the kettle body from the 1# nozzle; the mixed liquid flow of the chlorosulfonated polyethylene solution and hot water ejected from the 1# nozzle and the low-pressure steam flow ejected from the 2# nozzle meet at the fluid collision point A on the stirring plane formed by the stirrer; the solvent in the chlorosulfonated polyethylene solution azeotropes after colliding with the steam and hot water, becomes a mixed gas and continuously rises, and is discharged from the top exhaust port; the chlorosulfonated polyethylene in the chlorosulfonated polyethylene solution precipitates from the solution, and under the action of fluid impact and stirring, forms chlorosulfonated polyethylene wet glue particles with uniform particles and containing 40% - 50% water, and is discharged from the overflow port along with the overflowing hot water.

2. The method for improving the solvent effect in the chlorosulfonated polyethylene solution by wet removal according to claim 1, wherein In the coagulation kettle, the temperature of the hot water is 89°C - 92°C, the flow rate of the chlorosulfonated polyethylene solution is 1000 kg / h - 3000 kg / h, the premixing ratio of the chlorosulfonated polyethylene solution and hot water is 1:4, and the stirring speed is 80 r / min - 150 r / min.

3. The method for improving the solvent effect in the chlorosulfonated polyethylene solution by wet removal according to claim 1, characterized in that The 1# nozzle forms an angle of 45° with the stirring plane of the stirrer.

4. The method for improving the solvent effect in the chlorosulfonated polyethylene solution by wet method according to claim 1, characterized in that There are 2 - 4 1# nozzles, which are evenly distributed around the stirrer as the center, and the nozzle aperture is Φ100mm.

5. The method for improving the solvent effect in the chlorosulfonated polyethylene solution by wet removal according to claim 1, characterized in that The total flow rate of the mixed liquid flow of the chlorosulfonated polyethylene solution and hot water premixed by all the 1# nozzles is 5000 kg / h - 15000 kg / h.

6. The method for improving the solvent effect in the chlorosulfonated polyethylene solution by wet desulfurization according to claim 1, characterized in that The 2# nozzle forms an angle of 30° with the stirring plane of the stirrer.

7. The method for improving the solvent effect in the chlorosulfonated polyethylene solution by wet desulfurization according to claim 1, characterized in that There are 2 - 4 2# nozzles, corresponding to each 1# nozzle, evenly distributed around the stirrer as the center, and the nozzle aperture is Φ50mm.

8. The method for improving the solvent effect in the chlorosulfonated polyethylene solution by wet removal according to claim 1, wherein The total flow rate of the low-pressure steam flow of all the 2# nozzles is 1000 kg / h - 2000 kg / h.

9. The method for improving the solvent effect in the chlorosulfonated polyethylene solution by wet removal according to claim 1, characterized in that The mixed liquid flow of the chlorosulfonated polyethylene solution and hot water ejected from the 1# nozzle and the low-pressure steam flow ejected from the 2# nozzle meet at the fluid collision point A on the stirring plane formed by the stirrer, and the two liquid flows meet at an angle of 120°.

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