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Compound polymerization inhibitor for styrene rectification

A technology of styrene and polymerization inhibitors, which is applied in the field of compounded polymerization inhibitors, can solve the problems of high dosage of compounded polymerization inhibitors, difficult to master the proportion, and low economic efficiency, etc., so as to achieve good polymerization inhibition effect and reduce Increased speed and liveliness

Active Publication Date: 2020-04-17
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dosage of the composite type polymerization inhibitor is high, the economy is not strong, and its composition is complicated at the same time, and the ratio between the components is difficult to grasp. Therefore, it is necessary to develop a new type of styrene polymerization inhibitor with high efficiency, stability and low toxicity. Reduce monomer loss and improve production efficiency

Method used

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  • Compound polymerization inhibitor for styrene rectification
  • Compound polymerization inhibitor for styrene rectification
  • Compound polymerization inhibitor for styrene rectification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The composition of the polymerization inhibitor is as follows:

[0023] 4-Carbonyl-2,2,6,6-tetramethylpiperidine nitroxide: 10%

[0024] 3-Chloro-2,4-ditrifluoromethylthiophenol: 1%

[0025] Ethylbenzene: 89%

Embodiment 2

[0027] The composition of the polymerization inhibitor is as follows:

[0028] 4-Carbonyl-2,2,6,6-tetramethylpiperidine nitroxide: 20%

[0029] 3-Chloro-2,4-ditrifluoromethylthiophenol: 10%

[0030] Ethylbenzene: 70%

Embodiment 3

[0032] The composition of the polymerization inhibitor is as follows:

[0033] 4-Carbonyl-2,2,6,6-tetramethylpiperidine nitroxide: 30%

[0034] 3-Chloro-2,4-ditrifluoromethylthiophenol: 15%

[0035] Ethylbenzene: 55%

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Abstract

The invention relates to a compound polymerization inhibitor for styrene rectification, wherein the compound polymerization inhibitor is prepared from a nitroxide free radical compound, 2,4-ditrifluoromethyl thiophenol halide and a solvent. According to the invention, by utilizing the synergistic effect of all the components, the compound polymerization inhibitor remarkably improves the polymerization inhibition effect, reduces the tar discharge amount of a styrene device, improves the production capacity of a styrene rectification device, reduces the toxicity of the polymerization inhibitor and is environment-friendly.

Description

technical field [0001] The invention belongs to the field of chemical auxiliaries, and relates to a compound polymerization inhibitor suitable for a styrene rectification process. Background technique [0002] Styrene is the basic product of petrochemical industry and an important raw material for synthetic polymers. Styrene has the property of thermal polymerization, that is, the temperature can initiate its polymerization, and the higher the temperature, the faster the polymerization rate. Industrially, ethylbenzene is mainly produced by gas-phase catalytic dehydrogenation of ethylbenzene. The mixed liquid after dehydrogenation of ethylbenzene is sent to a rectifying tower for rectification and separation. The temperature of this process is high, so the loss of styrene is very serious. The resulting polymer will also block the equipment and pipelines of the next process and affect the normal progress of industrial production. Therefore, a polymerization inhibitor must be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/20C07C15/46C07C7/04
CPCC07C7/20C07C7/04C07C15/46Y02P20/10
Inventor 赵甲林亚祥徐彬宋滔张春丽黄占凯于海斌
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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