Adiponitrile production system

A production system and adiponitrile technology, applied in the chemical industry, can solve the problems of coke formation, poor mixing effect, side reactions, etc., and achieve the effect of prolonging the operation period, avoiding decomposition and coking, and improving yield

Active Publication Date: 2018-08-17
重庆华峰聚酰胺有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because adipic acid will generate by-products such as decarboxylation, decomposition, and coking at high temperatures, which not only affects the unit consumption; adipic acid generates coke at high temperatures and also affects the operating cycle
[0006] Patent CN201510185122.7 discloses a method for producing adiponitrile by adipic acid liquid phase method. Its main innovation is the use of solid phosphoric acid catalyst. Although it can be stirred, the mixing effect is not very good, and its catalytic performance will also be affected.
[0007] Patent CN20

Method used

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  • Adiponitrile production system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]The molten adipic acid with a flow rate of 2400kg / h is sent from the adipic acid buffer tank 1, and the liquid phosphoric acid catalyst of 4.8kg / h is uniformly mixed through the mixer 3 at the outlet of the adipic acid feed pump, and then sent to the ammoniation reaction device 4. The reactor is fed with ammonia gas of 2236kg / h through the ammonia gas inlet 43 (the molar ratio of adipic acid is 8:1, that is, the excess of ammonia gas is 3 times), and the reaction is carried out under the conditions of 160°C and 90KPa, and the adipic acid The acid ammoniation rate is 95%. The ammoniated material enters the nitrilation reactor 5, and is heated to 260°C with VP-1 heat conduction oil steam with good thermal stability and low liquid phase viscosity to dehydrate to form adiponitrile, and cyclopentanone, ICCP will be produced at the same time. And other by-products and intermediate products such as cyanovaleric acid and cyanovaleramide. The adiponitrile containing the interme...

Embodiment 2

[0039] After flow is the molten adipic acid of 2400kg / h and the liquid phosphoric acid catalyst of 7.2kg / h by the circulation line of mixer and feed pump after uniform mixing, feed the ammonia gas of 2794kg / h (with the mol ratio of adipic acid 10:1, that is, the excess of ammonia is 4 times), wherein the fresh ammonia is about 485kg / h, and the circulating ammonia is about 2309kg / h. Under the conditions of 170° C. and 90 KPa, the ammoniation rate of adipic acid in the ammoniation reactor 4 is 96.5%. The ammoniated material enters the nitrilation reactor, and is dehydrated at 270°C by using VP-1 heat transfer oil steam to generate adiponitrile; the reaction will also generate cyclopentanone, ICCP and other by-products, cyanovaleric acid, cyano Intermediate products such as pentamide. The adiponitrile containing the intermediate product can also continue to enter the lower half of the separation tower for separation, and at the same time, a part of the circulating liquid is sent...

Embodiment 3

[0041] After flow is the molten adipic acid of 2400kg / h and the liquid ammonium phosphate catalyst of 16.2kg / h by the circulation line of mixer and feed pump after evenly mixing, pass into the ammonia gas of 4471kg / h (with the mole of adipic acid The ratio is 16:1, that is, the excess of ammonia is 7 times) to react, wherein the fresh ammonia is about 776kg / h, and the circulating ammonia is about 3695kg / h. Under the conditions of 180° C. and 90 KPa, the ammoniation rate of adipic acid in the ammoniation reactor 4 is 98.5%. The ammoniated material enters the nitrilation reactor, and is dehydrated at 290°C by using VP-1 heat transfer oil steam to generate adiponitrile; the reaction will also generate cyclopentanone, ICCP and other by-products, cyanovaleric acid, cyano Intermediate products such as pentamide. The adiponitrile containing the intermediate product can also continue to enter the lower part of the separation tower for separation, and the pipeline at the bottom of the...

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Abstract

The invention relates to an adiponitrile production system which comprises an adipic acid storage tank, a mixer, an adipic acid ammoniation reactor, a cyanation reactor, a separation tower, an ammoniagas cooler, an ammonia gas decarburization tower, a circulating ammonia gas dehydrator and a liquid ring compressor. The adipic acid storage tank is connected to the mixer by a pipeline, a branch fordelivering liquid phosphoric acid is arranged on the pipeline, the mixer is connected to an inlet of the adipic acid ammoniation reactor, an ammonia gas inlet and adipic acid ammoniation product andammonia gas outlets are further formed in the adipic acid ammoniation reactor, the adipic acid ammoniation product and ammonia gas outlets are connected with the cyanation reactor by pipelines, and the cyanation reactor is connected to the separation tower. The adiponitrile production system has the advantage that the shortcomings of decomposition and condensation coking of adipic acid in existingproduction routes at the high temperatures and the like can be overcome by the aid of the adiponitrile production system.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a production system of adiponitrile. Background technique [0002] Adipic acid catalyzed ammoniation method is that adipic acid and ammonia react to form adiponitrile under the action of dehydration catalyst. According to the different physical states of adipic acid, the process is divided into adipic acid liquid phase method and adipic acid gas phase method. Among them, the reaction temperature of the liquid phase method is generally around 280°C, and the reaction temperature of the gas phase method is 350°C-420°C. Different from the gas-phase method, in order to reduce the generation of by-products and tar in the liquid-phase method, an additional diluent is added to maintain the uniformity of the temperature of the reaction system. In addition, the liquid-phase method is more favored by the industry because of its relatively simple process, less ring-shaped impurities...

Claims

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Application Information

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IPC IPC(8): C07C255/04C07C253/22
CPCC07C253/22C07C255/04
Inventor 陈恩之赵风轩张银杏杨建新王焕哲姜曦徐淑媛周晓燕李全刘新安陈发挥
Owner 重庆华峰聚酰胺有限公司
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