Polymerization inhibitor for preparation apparatus of acrylic acid

A polymerization inhibitor, acrylic acid technology, applied in the field of polymerization inhibitors, can solve the problems of high cost, large usage, and great difference in polymerization inhibition effect, and achieve the effect of high stability

Inactive Publication Date: 2017-02-15
JIANGSU SANDIE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Commonly used polymerization inhibitors are AI-61A, PZ, MQ, HQ, AI-61R, chain transfer type polymerization inhibitors HQ, MQ, etc., generally have a better effect when combined with other polymerization inhibitors, but in aerobic and anaerobic conditions The polymerization inhibition effect varies greatly under different conditions, PZ, HQ, use a large amount, and the cost is relatively high

Method used

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  • Polymerization inhibitor for preparation apparatus of acrylic acid
  • Polymerization inhibitor for preparation apparatus of acrylic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of polymerization inhibitor for the device of preparing acrylic acid, the polymerization inhibitor contains 2,6-dimethylpiperidine-1-oxyl radical and N,N-dimethylthiourea, and the mass of both The ratio is 1:1.

[0022] An application of the polymerization inhibitor, adding the polymerization inhibitor to the C2 deacetate tower (4KPaA, 90°C) of the device for preparing acrylic acid; wherein the amount of the polymerization inhibitor is 0.03wt% of the crude acrylic acid in the C2 deacetate tower . The purity of the acrylic acid product prepared by participating in the polymerization inhibitor of the present invention is more than 99.5%, and the chroma is less than 10.

Embodiment 2

[0024] A kind of polymerization inhibitor for the device of preparing acrylic acid, the polymerization inhibitor contains 2,6-dimethylpiperidine-1-oxyl radical and N,N-dimethylthiourea, and the mass of both The ratio is 1:1.5.

[0025] A kind of application of said polymerization inhibitor, said polymerization inhibitor is added in the C2 deacetate tower (4KPaA, 90 ℃) and C2 reflux tank of the device for preparing acrylic acid; Wherein the polymerization inhibitor consumption is C2 Deacetate tower (4KPaA , 90° C.) and wherein the amount of the polymerization inhibitor is 0.04wt% of the crude acrylic acid in the C2 deacetic acid tower. The purity of the acrylic acid product prepared by the polymerization inhibitor of the present invention is more than or equal to 99.5%, and the chromaticity is less than 10.

Embodiment 3

[0027] A kind of polymerization inhibitor for the device of preparing acrylic acid, the polymerization inhibitor contains 2,6-dimethylpiperidine-1-oxyl radical and N,N-dimethylthiourea, and the mass of both The ratio is 1:1.

[0028] An application of the polymerization inhibitor is that the polymerization inhibitor is dissolved in an organic solvent and injected into the C2 deacetate tower (4KPaA, 90° C.) of the device for preparing acrylic acid through a syringe. The amount of the polymerization inhibitor is 0.04wt% of the amount of crude acrylic acid in the C2 deacetic acid tower. The acrylic acid product prepared by the polymerization inhibitor of the present invention has a purity ≥ 99.5% and a chroma of 8.

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PUM

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Abstract

The invention discloses a polymerization inhibitor for a preparation apparatus of acrylic acid. The polymerization inhibitor contains 2,6-dimethylpiperidin-1-oxyl free radical and N,N'-dimethylthiourea, the mass ratio is 1:1-1.5, and the polymerization inhibitor is applied to a C2 acetic acid removing tower and / or a C2 return tank of the preparation apparatus of acrylic acid. The polymerization inhibitor is an environmental protection high-efficient polymerization inhibitor, and the polymerization inhibitor has the advantages of few usage amounts without toxicity and generation of corrosion; good polymerization inhibiting effects are provided, environment and occupational health of employees are protected, and the polymerization inhibitor accords with high efficient and environmentally friendly production and operation ideas.

Description

technical field [0001] The invention relates to the technical field of acrylic acid preparation, in particular to a polymerization inhibitor used in a device for preparing acrylic acid. Background technique [0002] Acrylic acid and its esters are vinyl monomers that are easily polymerized. Polymerization is common in the production process. For the reaction of forming oligomers, appropriate measures can be taken to suppress it within an acceptable range; vinyl polymerization, etc. As a result, terminal polymers with large relative molecular weight, high insolubility, and popcorn or rubber-like appearance will be generated. These polymers block pipes, trays, and pump bodies, causing serious damage to the stable operation of processes and production equipment. greater impact. Therefore, reasonable measures must be taken to avoid this situation, and the most common method at present is to add appropriate polymerization inhibitors in the production process. [0003] At presen...

Claims

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Application Information

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IPC IPC(8): C07C51/44C07C51/50C07C57/075
CPCC07C51/44C07C51/50C07C57/04
Inventor 顾骏贾红军刘洪林薛中群王国民程耀林
Owner JIANGSU SANDIE CHEM CO LTD
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