Tail gas treatment method in acrylonitrile production system

A tail gas treatment and production system technology, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve problems such as difficult to meet pollutant discharge standards, achieve high-precision adjustment of heat source flow, reduce operating load, and improve The effect of adjusting precision

Pending Publication Date: 2021-03-05
中石油吉林化工工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional absorption method is also difficult to meet the latest pollutant discharge standards

Method used

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  • Tail gas treatment method in acrylonitrile production system
  • Tail gas treatment method in acrylonitrile production system
  • Tail gas treatment method in acrylonitrile production system

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Embodiment Construction

[0040] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that are used in the embodiments. Apparently, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to these drawings without creative efforts.

[0041]When describing the embodiments of the present invention, the terms "vertical", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", " The orientation or positional relationship expressed by "horizontal", "top", "bottom", "inner" and "outer" is based on the orientation or positional relationship shown in the relevant drawings, which are only for the convenience of describing the present invention and simplifying the description, and It is not to indicate or imply that the device or element referred to must have a particul...

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Abstract

The invention relates to a tail gas treatment method in an acrylonitrile production system. The tail gas treatment method comprises the following steps of: a, washing or cooling and separating tail gas generated in the acrylonitrile production system, and sending the tail gas to an absorption tower for absorption treatment; b, discharging the tail gas absorbed by the absorption tower to a tail gastreatment device to finish tail gas treatment, and pumping the tower bottom liquid in the absorption tower to a recovery tower as rich water to further desorb acrylonitrile, hydrocyanic acid and acetonitrile; and c, pumping the tower bottom liquid in the recovery tower to the absorption tower as lean water to further absorb acrylonitrile and other organic matters. The method can reduce the environmental pollution in the acrylonitrile production process. Meanwhile, the harm to production caused by residual ammonia entering a refining system can be avoided. High-precision adjustment of the heatsource flow of a recovery tower reboiler can be realized. The heat energy of the lean water at the tower bottom of the recovery tower is recycled. The operation load of the absorption tower can be reduced.

Description

technical field [0001] The invention relates to the field of acrylonitrile production, in particular to a tail gas treatment method in an acrylonitrile production system. Background technique [0002] At present, the tail gas produced by domestic acrylonitrile production equipment contains acrylonitrile and hydrocyanic acid and other media, and is usually discharged to the flare system or directly to the atmosphere at high altitude. The tail gas is easy to aggregate during the transportation process, which will block the pipeline and equipment; venting will cause air pollution. As domestic environmental protection management requirements become more and more stringent, direct discharge to the atmosphere cannot meet the emission standards. Setting up VOC treatment skid alone increases the investment and increases the number of multiple emission points. [0003] Moreover, in the production process of propylene and ammoxidation to produce acrylonitrile, the amine-ene ratio is...

Claims

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Application Information

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IPC IPC(8): B01D53/18
CPCB01D53/18B01D53/1418
Inventor 李大伟刘清娟陆玲王艳红
Owner 中石油吉林化工工程有限公司
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