Acrylonitrile quench method

An acrylonitrile quenching technology, applied in the field of acrylonitrile quenching, can solve problems such as easy blockage of tower equipment, unreasonable gas-liquid distribution, increased loss of acrylonitrile, etc., to reduce dissolution loss, reduce diffusion and horizontal back mixing, reduce Effect of Aggregation Opportunities

Inactive Publication Date: 2005-03-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the problem that the sewage in the lower stage of the previous production of acrylonitrile contains ammonium salt, the ammonium salt cannot be recovered, the sewage must be treated in a deep well, and the tower equipment is easy to block, or because the lower section of the tower equipment does not have any internal components, resulting in The gas-liquid distribution is unreasonable, the lower part is strongly alkaline, and the loss of acrylonitrile increases here. A new quenching method for acrylonitrile is provided.

Method used

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Effect test

Embodiment 1

[0032] The composition (% by weight) of the reactor tail gas was: acrylonitrile 12.4, acetonitrile 0.5, hydrocyanic acid 1.4, acrolein 0.1, acrylic acid 0.3, ammonia 0.3, and others 85.0. The flow rate is 9.25 tons / hour, the feed temperature is 220 °C, and the quenching tower of the present invention is adopted, the lower section of the external circulating liquid is sprayed with 5 layers, the nozzle installation angles are 0°, 30°, and 150°, and the inner components of the lower section are composed of external It is a circle, the internal channel is composed of equilateral triangle packing units, the number of packing units is 7, D2=0.5D1, d2=0.5d1, the arithmetic average cross-sectional area of ​​the internal passages of all the packing units is 75% of the cross-sectional area of ​​the tower, and the lower section does not Add acid; the number of plates in the upper section is 8, and the pH value of the external circulating liquid is controlled to be 3.0. The recovery rate ...

Embodiment 2

[0034] The composition (% by weight) of the reactor tail gas was: acrylonitrile 12.4, acetonitrile 0.5, hydrocyanic acid 1.4, acrolein 0.1, acrylic acid 0.3, ammonia 0.3, and others 85.0. The flow rate is 9.25 tons / hour, the feed temperature is 220°C, and the quenching method of the present invention is adopted, the lower section of the external circulating liquid is sprayed into 3 layers, the nozzle installation angles are 0°, 120°, and 180°, and the lower section internal components are composed of external It is circular, and the internal channel is composed of regular pentagon packing units. The number of packing units is 4, D2=0.75D1, d2=0.75d1, and the arithmetic average cross-sectional area of ​​the internal channel of all packing units is 45% of the column cross-sectional area. No acid is added in the lower section; the number of plates in the upper section is 5, and the pH value of the control external circulation liquid is 3.0. The recovery rate of acrylonitrile in t...

Embodiment 3

[0036] The composition (% by weight) of the reactor tail gas was: acrylonitrile 12.4, acetonitrile 0.5, hydrocyanic acid 1.4, acrolein 0.1, acrylic acid 0.3, ammonia 0.3, and others 85.0. The flow rate is 9.25 tons / hour, the feed temperature is 220°C, and the quenching method of the present invention is adopted. The lower section of the outer circulating liquid is sprayed with two layers, the nozzle installation angles are 30° and 150°, and the inner components of the lower section are circular from the outside. , the internal channel is also composed of circular packing units, the number of packing units is 6, D2=D1, d2=d1, the arithmetic average cross-sectional area of ​​the internal channel of all packing units is 25% of the cross-sectional area of ​​the tower, and no acid is added in the lower section; The number of trays is 3, and the pH value of the external circulating liquid is controlled to be 3.0. The recovery rate of acrylonitrile in the quench tower was 95.6%, and ...

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Abstract

The present invention relates to a quenching method of acrylonitrile, it is characterized by that in the upper section of quenching tower the acid or mixture of the acid and upper section partial external circulation liquid phase can be directly added on the liquid-collecting disk of its upper section, and the pH value of external circulation liquid can be controlled to 2-5, and in the lower section of the quenching tower a reasonable member is added and the gas-liquid distribution in the tower can be optimized so as to raise recovery rate of acrylonitrile by 4-5%. Said invention can be used in industrial production equipment of acrylonitrile.

Description

technical field [0001] The present invention relates to a quenching method of acrylonitrile. Background technique [0002] Acrylonitrile is one of the important organic chemical raw materials. It has a considerable production capacity in my country. The level of acrylonitrile technology is generally equivalent to foreign technologies. On the one hand, whether it is an imported device or a domestic self-designed device, the effect is not satisfactory. According to repeated calibration analysis, in the domestic production of acrylonitrile, the recovery rate of acrylonitrile is generally only about 90%, of which the loss of acrylonitrile in the quench tower accounts for about 8%. [0003] At present, acrylonitrile is mainly prepared by ammoxidation of propylene. In order to convert propylene as much as possible, a synthetic process with excess ammonia is generally used. Therefore, the tail gas of the reactor contains a certain amount of unreacte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C253/26C07C255/08
Inventor 甘永胜张辉韩金海
Owner CHINA PETROLEUM & CHEM CORP
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