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Method and device for preparing acrylonitrile by recycling HPPO process waste gas

A technology of acrylonitrile and resource utilization, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylic acid nitrile, etc., can solve the problems of large nitrogen consumption and insufficient economy, achieve high safety and reduce VOC emissions , solve the effect of large consumption

Pending Publication Date: 2019-07-12
JIANGSU YANGNONG CHEM GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the waste gas incineration, solvent absorption, catalytic oxidation and other treatment methods in the existing HPPO process are not economical and the nitrogen consumption is large

Method used

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  • Method and device for preparing acrylonitrile by recycling HPPO process waste gas

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Experimental program
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Effect test

Embodiment 1

[0031] In the gas phase discharged from the top of the deoxidation tower in the HPPO process, the content of propylene in the gas phase is 1.22%, the content of methanol is 0.84%, the content of water is 0.27%, the content of propylene oxide is 0.15%, the content of oxygen is 0.51%, and the content of nitrogen is 96.71%. ℃ condensing tank, stay for 2s, condense and recover the high-boiling organic matter in it, analyze the composition of the waste gas discharged from the condensing tank online, the content of propylene in the waste gas is 0.56%, the content of methanol is 40ppm, the content of water is 70ppm, the content of propylene oxide is 25ppm, and the content of oxygen is 0.52%. The nitrogen content is 98.91%. Then add ammonia gas to the waste gas discharged from the condensation tank according to the molar ratio of propylene and ammonia gas equal to 1:1, and then pass it into the acrylonitrile reactor equipped with bismuth phosphotungstate catalyst, the reaction pressure...

Embodiment 2

[0033] In the gas phase discharged from the top of the deoxidation tower in the HPPO process, the content of propylene in the gas phase is 0.86%, the content of methanol is 1.84%, the content of water is 0.89%, the content of propylene oxide is 0.05%, the content of oxygen is 1.01%, and the content of nitrogen is 95.35%. 5°C condensing tank, stay for 8s, condense and recover the high boiling point organic matter, analyze the composition of the waste gas discharged from the condensing tank online, the content of propylene in the waste gas is 0.36%, the content of methanol is 80ppm, the content of water is 55ppm, the content of propylene oxide is 15ppm, and the content of oxygen is 1.04%. , Nitrogen content 98.59%. Then add ammonia gas to the waste gas discharged from the condensation tank according to the molar ratio of propylene and ammonia gas equal to 1:1.1, and pass it into the acrylonitrile reactor equipped with bismuth oxide catalyst, the reaction pressure is 0.5MPa, the r...

Embodiment 3

[0035]In the gas phase discharged from the top of the deoxidation tower in the HPPO process, the content of propylene in the gas phase is 1.86%, the content of methanol is 1.38%, the content of water is 0.97%, the content of propylene oxide is 0.34%, the content of oxygen is 1.91%, and the content of nitrogen is 93.54%. 10°C condensation tank, stay for 10s, condense and recover the high boiling point organic matter, analyze the composition of the waste gas discharged from the condensation tank online, the content of propylene in the waste gas is 0.96%, the content of methanol is 90ppm, the content of water is 65ppm, the content of propylene oxide is 35ppm, and the content of oxygen is 1.94%. , Nitrogen content 97.10%. Then add ammonia gas to the waste gas discharged from the condensation tank according to the molar ratio of propylene and ammonia gas equal to 1:1.2, and pass it into the acrylonitrile reactor equipped with bismuth oxide-tin oxide catalyst, the reaction pressure i...

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Abstract

The invention provides a method and a device for preparing acrylonitrile by recycling HPPO process waste gas. The device comprises a deoxidation tower, a condensation tank, an acrylonitrile reaction tower, an ammonia neutralization tower and an absorption tower which are connected in sequence. The waste gas generated in the HPPO process is first introduced into the condensation tank to recover high-boiling point organic pollutants in the waste gas, the waste gas containing propylene, oxygen and nitrogen and supplemented ammonia gas are introduced into the acrylonitrile reactor, the propylene,oxygen and ammonia gas undergo an ammoxidation reaction under the action of a catalyst to generate acrylonitrile and consume the propylene and oxygen in the waste gas, the obtained reaction product isseparated, and then the separated nitrogen returns to the HPPO process section for recycling. The method and the device have the advantages of effective reduction of VOC emissions, realization of rational utilization of the propylene resource, production of acrylonitrile with high added values, recycling of the nitrogen, and improvement of the economical property of the HPPO process.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and relates to a method for preparing acrylonitrile by resource utilization of HPPO process waste gas, more specifically, a method for resource utilization of propylene-containing waste gas produced by HPPO process to synthesize acrylonitrile. The invention has the characteristics of intrinsically safe process, rational utilization of resources, less VOC discharge and the like. Background technique [0002] Propylene oxide (Propylene oxide) and acrylonitrile (Acrylonitrile) are both important basic organic chemical raw materials. Propylene oxide is the second largest propylene derivative after polypropylene. It is mainly used in the production of polyether polyols and propylene glycol. , Isopropanolamine and other chemical products. Acrylonitrile is an important monomer for the production of organic polymers, and is mainly used to produce polymers such as polyacrylonitrile (acryli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C253/18C07C255/08
CPCC07C253/18C07C255/08
Inventor 王根林丁克鸿徐林刘相李王铖马春辉殷恒志刘鑫
Owner JIANGSU YANGNONG CHEM GROUP
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