Constant temperature control device based on amination reactor

Abstract

The utility model relates to the technical field of reactors, in particular to a constant temperature control device based on an amination reactor. Comprising an amination reactor and a jacket wrapping the outer wall of the amination reactor, heat exchange pipes are spirally distributed in the jacket, the top of the jacket is connected with a heater through an oil outlet pipeline, the bottom of the jacket is connected with an outlet of the heater through a circulating pipeline, and a circulating oil pump is arranged on the oil outlet pipeline. The inlet end of the heat exchange pipe is connected with a cooler through a water inlet pipeline; according to the amination reactor, hot oil heated to a certain temperature is circularly conveyed into the jacket by starting the circulating oil pump, so that the temperature in the amination reactor is ensured to be constant; the heat exchange pipe, the cooler, the water inlet pipeline, the water outlet pipeline and other structures are matched for use, so that the heat of released heat can be quickly taken away, the reaction speed is ensured, the product quality is stabilized, and the cooling speed can be increased after the reaction is completed through the matching use with the oil storage tank, the oil discharge pipeline and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of reactors, in particular to a constant temperature control device based on an amination reactor. Background Art

[0002] The synthesis of N-methylpyrrolidone (NMP) is divided into two routes: catalytic and non-catalytic. At present, the process of synthesizing NMP by amination of γ-butyrolactone and methylamine aqueous solution without catalyst is widely used at home and abroad. Among the approximately 50 NMP production enterprises in China, about 20 have the ability to synthesize, all of which are non-catalyzed synthesis processes, and all use shell-and-tube reactors. Shell-and-tube reactors have the advantages of simple production and low maintenance costs, but they also have the disadvantages of large floor space and low production capacity of a single set of synthesis equipment. They are mainly used in lithium battery slurry, chemical industry, polymer materials, etc. In the industrial process with catalysts, the ZSM-5 molecular sieve composite rare earth cerium catalyst is introduced into the amination reaction system to increase the reaction rate. The residence time of the reactants in the amination reactor is 0.4-06h, the pressure is 4.6-5.2MPa, and the temperature is 160-200℃.

[0003] However, there is a type of exothermic reaction in catalytic reactions. This type of reaction will generate a certain amount of heat during the reaction. If this heat is not removed in time, it will cause the catalyst bed temperature in the amination reactor to suddenly rise, the temperature in the amination reactor to get out of control, the catalyst activity to decrease, and even coking and carbonization, and ultimately the reaction fails. Moreover, after the reaction is completed, the temperature in the amination reactor is generally cooled naturally, which takes a long time. Utility Model Content

[0004] The utility model aims at the deficiencies of the prior art and provides a constant temperature control device based on an amination reactor, which solves the problems in the prior art of not being able to quickly remove heat during the reaction process and slow cooling after the reaction is completed, so as to control the reaction temperature, ensure the reaction speed and stabilize the product quality.

[0005] To achieve the above technical purpose, the utility model proposes the following technical scheme: a constant temperature control device based on an amination reactor, comprising an amination reactor and a jacket wrapped on the outer wall of the amination reactor, wherein heat exchange tubes are spirally distributed in the jacket, the top of the jacket is connected to a heater through an oil outlet pipeline, the bottom of the jacket is connected to the outlet of the heater through a circulating pipeline, a circulating oil pump is provided on the oil outlet pipeline, the inlet end of the heat exchange tube is connected to a cooler through a water inlet pipeline, the outlet end of the heat exchange tube is connected to the water outlet of the cooler through a water outlet pipeline, and a water delivery pump is installed on the water inlet pipeline.

[0006] Furthermore, the oil outlet pipeline is connected to an oil storage tank via an oil discharge pipeline, an oil pump is provided on the oil discharge pipeline, the outlet end of the oil storage tank is connected to the circulation pipeline via an oil inlet pipeline, and the connection between the oil inlet pipeline and the circulation pipeline is located on the side of the circulating oil pump away from the heater.

[0007] Furthermore, an exhaust valve is provided on the top of the heat exchange tube.

[0008] Furthermore, an oil drain pipe valve is provided on the oil drain pipeline, a circulation pipe valve is provided on one end of the circulation pipeline close to the heater, and an oil inlet pipe valve is provided on one end of the oil inlet pipeline close to the circulation oil pump.

[0009] Furthermore, the water outlet pipeline is connected to a nitrogen purge pipeline, and the water inlet pipeline is connected to a nitrogen exhaust pipeline.

[0010] Furthermore, the nitrogen purge pipeline is provided with a nitrogen inlet valve, the nitrogen exhaust pipeline is provided with a nitrogen outlet valve, the water outlet pipeline is provided with a water outlet valve at one end close to the nitrogen purge pipeline, and the water inlet pipeline is provided with a water inlet valve at one end close to the nitrogen exhaust pipeline.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the utility model has a novel structure, an ingenious conception, and is simple and convenient to operate. Compared with the prior art, the utility model has the following advantages: the utility model circulates the hot oil heated to a certain temperature into the jacket by opening the circulating oil pump, keeps the hot oil in the jacket at a stable temperature value, and indirectly ensures the constant temperature in the amination reactor; through the coordinated use of structures such as heat exchange tubes, coolers, and water inlet and outlet pipelines, not only can the heat released by heat be quickly taken away, the reaction speed be guaranteed, and the product quality be stabilized, but also through the coordinated use with oil storage tanks, oil discharge pipelines, etc., the cooling speed can be increased after the reaction is completed; through structures such as nitrogen purge pipelines, all water in the heat exchange tubes can be discharged to ensure safe production. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] In the figure, 1, amination reactor; 2, jacket; 3, heat exchange tube; 4, oil outlet pipeline; 5, heater; 6, circulation pipeline; 7, circulation oil pump; 8, water inlet pipeline; 9, cooler; 10, water outlet pipeline; 11, water pump; 12, oil discharge pipeline; 13, oil storage tank; 14, oil pump; 15, oil inlet pipeline; 16, oil discharge pipe valve; 17, circulation pipe valve; 18, oil inlet pipe valve; 19, nitrogen purge pipeline; 20, nitrogen exhaust pipeline; 21, nitrogen inlet pipe valve; 22, nitrogen outlet pipe valve; 23, water outlet valve; 24, water inlet valve. DETAILED DESCRIPTION

[0014] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0015] The utility model provides a constant temperature control device based on an amination reactor, comprising an amination reactor 1 and a jacket 2 wrapped on the outer wall of the amination reactor 1, wherein heat exchange tubes 3 are spirally distributed in the jacket 2, the top of the jacket 2 is connected with a heater 5 through an oil outlet pipeline 4, a small-capacity expansion-resistant oil barrel can be installed on the oil outlet pipeline 4 to improve the safety of operation, the bottom of the jacket 2 is connected with the outlet of the heater 5 through a circulation pipeline 6, a circulation oil pump 7 is arranged on the oil outlet pipeline 6, the inlet end of the heat exchange tube 3 is connected with a cooler 9 through a water inlet pipeline 8, the outlet end of the heat exchange tube 3 is connected with the water outlet of the cooler 9 through a water outlet pipeline 10, and a water delivery pump 11 is installed on the water inlet pipeline 10.

[0016] like Figure 1 As shown, during heating, the heated hot oil is input into the jacket 2 along the circulation pipeline 6 by starting the circulating oil pump 7, so that the heated hot oil fills the entire jacket 2, and the amination reactor 1 is heated. The hot oil will flow into the heater 5 along the oil outlet pipeline 4 to heat the hot oil flowing out of the jacket 2, so that the hot oil flowing into the heating jacket 2 is always kept at a constant temperature. After that, the heated hot oil flows into the jacket 2 again to realize the hot oil circulation in the jacket 2, so that the amination reactor 1 is kept at a constant temperature and the heat preservation effect is achieved; during the reaction process, when heat is released, cold water is transported into the heat exchange tube 3 by starting the water delivery pump 11. The cold water in the heat exchange tube 3 takes away part of the heat in the hot oil and enters the cooler 9 along the water outlet pipeline 10 for cooling. The cooled water will enter the heat exchange tube 3 along the water inlet pipeline 8 again to realize the circulation of cold water in the heat exchange tube 3 until the temperature in the amination reactor drops to the required temperature, thereby ensuring the overall reaction speed and stabilizing the product quality.

[0017] The oil outlet pipeline 4 is connected to an oil storage tank 13 via an oil discharge pipeline 12, and an oil pump 14 is provided on the oil discharge pipeline 12. The outlet end of the oil storage tank 13 is connected to the circulation pipeline 6 via an oil inlet pipeline 15, and the connection between the oil inlet pipeline 15 and the circulation pipeline 6 is located on the side of the circulation oil pump 7 away from the heater 5.

[0018] like Figure 1 As shown, after the reaction is completed, when the amination reactor 1 needs to be cooled, the hot oil in the jacket 2 is temporarily stored in the oil storage tank 13 along the oil discharge pipeline 6 by starting the oil pump 14, and then the water delivery pump 11 is started to deliver cold water to the heat exchange tube 3 to cool the jacket 2, and indirectly cool the amination reactor 1. Compared with the traditional natural cooling method, the cooling speed is faster.

[0019] An exhaust valve is provided on the top of the heat exchange tube 3 .

[0020] like Figure 1 As shown, the exhaust valve can discharge the vaporized water vapor in the heat exchange tube 3 to maintain the pressure balance in the heat exchange tube 3.

[0021] The oil discharge pipeline 12 is provided with an oil discharge pipe valve 16 , the end of the circulation pipeline 6 close to the heater 5 is provided with a circulation pipe valve 17 , and the end of the oil inlet pipeline 15 close to the circulation oil pump 7 is provided with an oil inlet pipe valve 18 .

[0022] like Figure 1 As shown, the oil discharge valve 16 controls the opening or closing of the oil discharge pipeline 12, the circulation pipe valve 17 can control the opening or closing of the circulation pipeline 6, and the oil inlet pipe valve 18 can control the opening or closing of the oil inlet pipeline 15. When the oil inlet pipe valve 18 is opened, the circulating oil pump 7 can be started to allow the oil in the oil storage tank 13 to enter the heater 5 along the oil inlet pipeline 15 and the lower oil outlet pipeline 4 for heating, and after heating, enter the jacket 2 through the circulation pipeline 6.

[0023] The water outlet pipeline 10 is connected to a nitrogen purge pipeline 19 , and the water inlet pipeline 8 is connected to a nitrogen exhaust pipeline 20 .

[0024] like Figure 1 As shown, by setting up a nitrogen purge pipeline 19 and a nitrogen exhaust pipeline 20, all the water in the heat exchange tube 3 can be discharged, so as to avoid the water in the heat exchange tube 3 being vaporized under the high temperature of the hot oil, causing the pressure in the heat exchange tube 3 to increase and causing safety hazards.

[0025] The nitrogen purge pipeline 19 is provided with a nitrogen inlet valve 21, the nitrogen exhaust pipeline 19 is provided with a nitrogen outlet valve 22, an end of the water outlet pipeline 10 close to the nitrogen purge pipeline 19 is provided with a water outlet valve 23, and an end of the water inlet pipeline 8 close to the nitrogen exhaust pipeline 20 is provided with a water inlet valve 24.

[0026] like Figure 1 As shown, the nitrogen inlet valve 21 and the nitrogen outlet valve 22 control the opening or closing of the nitrogen purge pipeline 19. When the cooler is stopped, the water outlet valve 23 and the water inlet valve 24 can prevent the water in the pipeline from flowing back into the cooler or the heat exchange tube 3.

[0027] Principle of use: when heating is required, close the water delivery pump 11, the oil pump 14, the oil discharge pipe valve 16, the nitrogen inlet pipe valve 21, the nitrogen outlet pipe valve 22, the water outlet valve 23 and the water inlet valve 24, open the circulation pipe valve 17, the oil inlet pipe valve 18 and start the circulation oil pump 11, the oil in the oil storage tank 13 enters the heater 5 through the oil outlet pipeline 15 and the circulation pipeline 6 under the suction of the circulation oil pump 7 for heating, the heated oil enters the jacket 3 through the oil outlet pipeline 4 to heat the amination reactor 1, and then the oil inlet pipe valve 18, and then the hot oil in the jacket 2 enters the heater 5 through the circulation pipeline 6 for heating, and then enters the jacket 2 through the oil outlet pipeline 4 until the temperature in the amination reactor 1 reaches the required temperature, and the temperature in the amination reactor is kept constant within a small range, so that safe production can be carried out;

[0028] When the chemical substances in the amination reactor 1 undergo a chemical reaction and generate heat, the water delivery pump 11, the water outlet valve 23 and the water inlet valve 24 are opened to circulate cold water into the heat exchange tube 3 in the jacket 2 to take away part of the heat of the hot oil in the jacket 2, so as to quickly reduce the temperature in the amination reactor 1 and make it quickly approach the set constant temperature.

[0029] When the amination reactor 1 needs to be cooled after the reaction, the oil pump 14 and the oil discharge pipe valve 16 are first opened, and the circulation pipe valve 17 is closed to store the hot oil in the jacket 2 in the oil storage tank 13, and the water delivery pump 11, the water outlet valve 23 and the water inlet valve 24 are opened, and the circulation pipe valve 17, the oil inlet pipe valve 18 and the circulation oil pump 11 are closed, and the water delivery pump 11 delivers cold water to the heat exchange pipe 3 to cool the amination reactor 1. Compared with the traditional natural cooling method, the cooling time in the amination reactor 1 can be greatly reduced.

[0030] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A constant temperature control device based on an amination reactor, comprising an amination reactor (1) and a jacket (2) wrapped around the outer wall of the amination reactor (1), characterized in that: Heat exchange tubes (3) are spirally distributed in the jacket (2); the top of the jacket (2) is connected to a heater (5) via an oil outlet pipeline (4); the bottom of the jacket (2) is connected to the outlet of the heater (5) via a circulation pipeline (6); a circulation oil pump (7) is provided on the oil outlet pipeline (4); the inlet end of the heat exchange tube (3) is connected to a cooler (9) via a water inlet pipeline (8); the outlet end of the heat exchange tube (3) is connected to a water outlet of the cooler (9) via a water outlet pipeline (10); and a water delivery pump (11) is installed on the water inlet pipeline (8).

2. A constant temperature control device based on an amination reactor according to claim 1, characterized in that: The oil outlet pipeline (4) is connected to an oil storage tank (13) via an oil discharge pipeline (12), and an oil pump (14) is provided on the oil discharge pipeline (12). The outlet end of the oil storage tank (13) is connected to a circulation pipeline (6) via an oil inlet pipeline (15), and the connection between the oil inlet pipeline (15) and the circulation pipeline (6) is located on a side of the circulation oil pump (7) away from the heater (5).

3. A constant temperature control device based on an amination reactor according to claim 1, characterized in that: An exhaust valve is provided at the top of the heat exchange tube (3).

4. A constant temperature control device based on an amination reactor according to claim 2, characterized in that: The oil discharge pipeline (12) is provided with an oil discharge pipeline valve (16), the end of the circulation pipeline (6) close to the heater (5) is provided with a circulation pipeline valve (17), and the end of the oil inlet pipeline (15) close to the circulation oil pump (7) is provided with an oil inlet pipeline valve (18).

5. A constant temperature control device based on an amination reactor according to claim 1, characterized in that: The water outlet pipeline (10) is connected to a nitrogen purge pipeline (19), and the water inlet pipeline (8) is connected to a nitrogen exhaust pipeline (20).

6. A constant temperature control device based on an amination reactor according to claim 5, characterized in that: The nitrogen purge pipeline (19) is provided with a nitrogen inlet valve (21), the nitrogen exhaust pipeline (20) is provided with a nitrogen outlet valve (22), an end of the water outlet pipeline (10) close to the nitrogen purge pipeline (19) is provided with a water outlet valve (23), and an end of the water inlet pipeline (8) close to the nitrogen exhaust pipeline (20) is provided with a water inlet valve (24).

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