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Acrylonitrile polymerization inhibitor as well as preparation method and application thereof

A technology of acrylonitrile and polymerization inhibitor, which is applied in the direction of purification/separation of carboxylic acid nitrile, organic chemistry, etc., and can solve problems such as poor polymerization inhibition effect

Pending Publication Date: 2020-11-17
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide an acrylonitrile polymerization inhibitor, its preparation method and application, so as to solve the problem that the existing acrylonitrile polymerization inhibitor has poor polymerization inhibition effect

Method used

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  • Acrylonitrile polymerization inhibitor as well as preparation method and application thereof
  • Acrylonitrile polymerization inhibitor as well as preparation method and application thereof
  • Acrylonitrile polymerization inhibitor as well as preparation method and application thereof

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preparation example Construction

[0039] Preferably, the preparation method of above-mentioned acrylonitrile efficient polymerization inhibitor comprises:

[0040] S1: Prepare a mixed solution of high boiling point alcohol ether and low melting point alcohol as a solvent;

[0041] S2: Use component A, component B and component C to prepare the main body of the polymerization inhibitor, component A is 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl radical or 4- Oxygen-2,2,6,6-tetramethylpiperidine-1-oxyl radical, component B is diethylamine or diethylhydroxylamine, component C is hydroquinone.

[0042] S3: Add the solvent prepared in step S1 dropwise to the main polymerization inhibitor prepared in step S2, and stir evenly at 30°C to 60°C to obtain a clear and transparent liquid, which is the high-efficiency acrylonitrile polymerization inhibitor.

[0043] Another aspect of the present application also provides an application of the above-mentioned acrylonitrile polymerization inhibitor in the production proce...

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Abstract

The invention provides an acrylonitrile polymerization inhibitor as well as a preparation method and application thereof. The acrylonitrile polymerization inhibitor comprises a solvent, a component A,a component B and a component C. The component A is a nitroxide free radical-containing N-heterocyclic compound shown as a formula (I); the component B is alkylamine; and the component C is a phenolic compound. The component A is a compound containing free radicals, so a large number of free radicals can be generated in the production process of acrylonitrile; and the free radicals can be captured by the component A and then inactivated, so the component A has the effect of preventing acrylonitrile from polymerizing and scaling. Alkylamine is added to play a role in slowly releasing free radicals in the component A, so the probability of inactivation caused by self-binding of free genes generated by the component A is reduced. The phenolic compound has reducibility, so free radicals in the acrylonitrile production process can be reduced by adding the phenolic compound, and the purpose of preventing acrylonitrile polymerization is achieved.

Description

technical field [0001] The invention relates to the field of acrylonitrile production, in particular to an acrylonitrile polymerization inhibitor, its preparation method and application. Background technique [0002] The acrylonitrile production unit of the propylene ammoxidation method adopts the method of extractive distillation, and the acrylonitrile production unit is mainly composed of reaction, recovery, refining, four-effect evaporation and other processes. The normal operation of acrylonitrile plant is often accompanied by some polymerization reactions. The polymerization of acrylonitrile or other reaction by-products such as hydrocyanic acid, acrolein, and acrylamide will cause fouling in the system. The formation of scale will shorten the operating cycle of equipment such as towers, reboilers and heat exchangers and reduce production efficiency. Generally speaking, the fouling of acrylonitrile polymerization in the recovery tower, dehydrocyanic acid tower and fini...

Claims

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Application Information

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IPC IPC(8): C07C253/32C07C255/08
CPCC07C253/32C07C255/08
Inventor 吴辉段福江姜日元吴霞王旭韩小平张成业阳军
Owner PETROCHINA CO LTD
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