Industrial production method of acrylonitrile

A production method and technology of acrylonitrile, applied in chemical instruments and methods, preparation/purification/separation of hydrogen cyanide, chemical recovery, etc., can solve unfavorable system safety and stability, difficulty in wastewater and waste gas treatment, and lack of heat source Make full use of other issues to achieve the effect of improving safety and reliability, saving circulating water and steam, and good economic benefits

Active Publication Date: 2012-09-12
CHINA TIANCHEN ENG +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the longer operation process requires more investment to complete, and at the same time, it also increases the leakage points in the device, which is not good for the safety and stability of the system; the wastewater and waste gas treatment of the acrylonitrile device is difficult, and special equipment needs to be set up. Reducing the discharge of waste water and waste gas will help reduce the investment of the device and improve the competitiveness of the product; the comprehensive utilization of energy is a systematic project, and the traditional process is rarely involved in this aspect. The heat sources of various grades in the device Not fully utilized, resulting in a waste of energy, but also increased the operating costs of the device

Method used

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  • Industrial production method of acrylonitrile
  • Industrial production method of acrylonitrile

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The reaction raw materials liquid propylene and liquid ammonia are mixed into the reactor 1 after passing through the evaporator and the superheater. The other raw material air for the reaction enters the air compressor after being filtered, and also enters the reactor 1 to participate in the reaction after being compressed.

[0032] In reactor 1, propylene, ammonia and air are oxidized under the action of a catalyst to produce acrylonitrile, hydrogen cyanide, acetonitrile, carbon monoxide, carbon dioxide, acrolein, acrylic acid and water. The reaction gas effluent also includes part of unreacted propylene, ammonia, oxygen, nitrogen and the like. The reaction gas enters the cyclone separator in the reactor 1, and the catalyst entrained by the reaction gas returns to the bed layer through the dipleg of the cyclone separator. The reaction gas enters the reaction gas cooler and is sent to the No. 1 tower 2 after being cooled.

[0033]The No. 1 tower 2 is divided into thr...

Embodiment 2

[0041] The reaction raw materials liquid propylene and liquid ammonia are mixed into the reactor 1 after passing through the evaporator and the superheater. The other raw material air for the reaction enters the air compressor after being filtered, and also enters the reactor 1 to participate in the reaction after being compressed.

[0042] In reactor 1, propylene, ammonia and air are oxidized under the action of a catalyst to produce acrylonitrile, hydrogen cyanide, acetonitrile, carbon monoxide, carbon dioxide, acrolein, acrylic acid and water. The reaction gas effluent also includes part of unreacted propylene, ammonia, oxygen, nitrogen and the like. The reaction gas enters the cyclone separator in the reactor 1, and the catalyst entrained by the reaction gas returns to the bed layer through the dipleg of the cyclone separator. The reaction gas enters the reaction gas cooler and is sent to the No. 1 tower 2 after being cooled.

[0043] The No. 1 tower 2 is divided into th...

Embodiment 3

[0051] The reaction raw materials liquid propylene and liquid ammonia are mixed into the reactor 1 after passing through the evaporator and the superheater. The other raw material air for the reaction enters the air compressor after being filtered, and also enters the reactor 1 to participate in the reaction after being compressed.

[0052] In reactor 1, propylene, ammonia and air are oxidized under the action of a catalyst to produce acrylonitrile, hydrogen cyanide, acetonitrile, carbon monoxide, carbon dioxide, acrolein, acrylic acid and water. The reaction gas effluent also includes part of unreacted propylene, ammonia, oxygen, nitrogen and the like. The reaction gas enters the cyclone separator in the reactor 1, and the catalyst entrained by the reaction gas returns to the bed layer through the dipleg of the cyclone separator. The reaction gas enters the reaction gas cooler and is sent to the No. 1 tower 2 after being cooled.

[0053] The No. 1 tower 2 is divided into th...

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PUM

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Abstract

The invention provides an industrial production method of acrylonitrile, which comprises that the air, propylene and ammonia are subjected to ammoxidation inside a reactor and generate a reaction gas containing the acrylonitrile; the reaction gas enters a first tower and shock cooling, neutralization and cooling are achieved; the reaction gas which is subjected to shock cooling, neutralization and cooling enters a second tower and the water absorbs organic materials contained in the reaction gas; the water absorbing liquid enters a third tower, the acrylonitrile, hydrocyanic acid and water vapor steamed out by the third tower are subjected to condensation, and then separation of an aqueous phase and an organic phase is achieved in a quantizer of the third tower; the water phase inside the quantizer of the third tower are delivered to the third tower; the water phase introduced from a last piece of tower plates of a tower kettle of the third tower is subjected to heat exchange and then serves as absorbing water of the second tower; a gas phase containing acetonitrile is extracted from the side lines of the third tower and sent into a fourth tower and a rough acetonitrile product is obtained; and the organic phase in the quantizer of the third tower enters a fifth tower and a sixth tower sequentially and hydrocyanic acid and a acrylonitrile product are respectively obtained. According to the method, the reliability of a device is improved and the energy utilization is high.

Description

technical field [0001] The invention relates to an industrial production method of acrylonitrile. Background technique [0002] Acrylonitrile is mainly used in the production of acrylic fiber, nitrile rubber, adiponitrile, acrylamide, ABS resin, pharmaceuticals, etc., and can also be used in the production of caprolactam and polyol polymers. It has broad applications in the fields of synthetic fibers, synthetic rubber, and plastics. application prospects. [0003] For the production of acrylonitrile, the development, improvement and perfection of its production process should pay special attention to environmental protection and occupational health. Most of them are extremely or highly harmful. If the process is unreasonable, environmental pollution problems may occur and cause personal injury. Therefore, the design principle of the process method is to improve the reliability of the device as much as possible, and reduce or even eliminate the efflux of process materials. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C255/08C07C255/03C07C253/18C01C3/02
CPCY02P20/582
Inventor 耿玉侠杨光马国栋杨克俭李强袁学民王美娇郑仁姚立东荣超赵峰
Owner CHINA TIANCHEN ENG
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