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Method and equipment for production of adiponitrile from adipic acid

A technology of adipic acid and adiponitrile, which is applied in the preparation of ammonia-carboxylic acid reaction, organic chemistry, etc., can solve problems such as difficult control of operating parameters, serious coking in reactors, unstable product quality, etc., and achieve normal reaction and raw material The effect of low consumption and long service life

Active Publication Date: 2015-04-15
ANSHAN GUORUI CHEM
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Problems solved by technology

[0005] Due to the above reasons: there are many by-products in the whole production process, and the consumption of raw materials is high; the coking of the reactor is serious, and the operation period is short; the product quality is unstable, and the content of heavy components is high; the production process is unstable, and the operating parameters are not easy to control

Method used

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  • Method and equipment for production of adiponitrile from adipic acid
  • Method and equipment for production of adiponitrile from adipic acid
  • Method and equipment for production of adiponitrile from adipic acid

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Embodiment Construction

[0024] The weight ratio of the materials and materials used in the production of adiponitrile from adipic acid is: molten adipic acid: ammonia: phosphoric acid: thinner=1: 1.5: 0.003: 2.2;

[0025] Concrete production method is: when original start-up, replace melting adipic acid with adiponitrile and join in the nitrilation reactor 3, and add phosphoric acid, the weight ratio of adiponitrile and phosphoric acid is 1: 0.004; Heating nitrilation reactor, Gradually raise the temperature, establish the circulation between the nitrilation reactor 3 → the bottom of the separation tower 5 → start the thermal cycle line 11 → nitrilation reactor 3; when the temperature in the nitrilation reactor reaches 100 ° C, after being compressed by the ammonia compressor 1 The gas ammonia enters in the central tube of the nitrilation reactor 3 through the ammonia pipeline 10, and the gas ammonia enters the bottom of the nitrilation reactor from the top of the central tube and flows upwards, and i...

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Abstract

The invention relates to a method and equipment for production of adiponitrile from adipic acid, and mainly solves the problem of unstable product quality in the prior art for production of adiponitrile from adipic acid. The method employs materials of fusing adipic acid, ammonia, phosphate and a diluent. The production method is as below: mixing phosphoric acid with the diluent in a pipeline mixer; conducting neutralization of adipic acid and ammonia in a cyanation reactor; sending reaction products into the bottom of a separation tower for separation; recovering gas phase of light components from an outlet; sending the diluent recovered by a gas lifting plate into the pipeline mixer, mixing the diluent with phosphoric acid in the pipeline mixer, and sending the mixture into the cyanation reactor to dilute adipic acid; and sending a liquid phase to a scraper type evaporator. The employed equipment includes an adipic acid storage tank, an ammonia compressor, a cyanation reactor, a pipeline mixer, a separation tower, a tail gas removal tower, a phosphoric acid storage tank and a scraper type evaporator. The invention has the advantage of a good quality of the produced adiponitrile product.

Description

Technical field: [0001] The invention relates to a method for producing adiponitrile with adipic acid and used equipment. Background technique: [0002] In the existing method for producing adiponitrile from adipic acid, the catalyst addition point is unreasonable. The phosphoric acid catalyst is added before the adipic acid enters the adipic acid storage tank. The catalyst content in the adipic acid in the device is unstable, sometimes high and sometimes low, and sometimes even zero. The dehydration reaction is unstable, and some materials are discharged from the system without reaction. [0003] Gas ammonia enters the bottom of the reactor from the central tube of the reactor. Due to the extrusion of the surrounding liquid, the gas flows upward along the outer wall of the central tube. The contact area between the gas phase and the liquid phase is small, and the stirring effect is not ideal. Due to the relatively concentrated airflow and relatively high flow rate, the ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C255/04C07C253/22
Inventor 李正一袁清顺王伟王延玲
Owner ANSHAN GUORUI CHEM
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