Polymerization inhibitor suitable for vinyl aromatic compound

A vinyl aromatic and polymerization inhibitor technology, applied in the field of polymerization inhibitors, can solve the problems of high requirements for polymerization inhibitors, and achieve the effects of high polymerization inhibition efficiency, low cost, and extended running time

Active Publication Date: 2010-10-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of high requirements for polymerization inhibitors in the purification of vinyl aromatic compounds under high temperature and normal pressure, and provide a polymerization inhibitor suitable for vinyl aromatic compounds. The polymerization inhibitor has low toxicity and is soluble in organic solvents. Good performance, good polymerization inhibition effect at high temperature, can greatly improve the yield of monomer rectification, reduce pollution, and obtain better economic benefits

Method used

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  • Polymerization inhibitor suitable for vinyl aromatic compound
  • Polymerization inhibitor suitable for vinyl aromatic compound
  • Polymerization inhibitor suitable for vinyl aromatic compound

Examples

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preparation example Construction

[0029] The preparation method of the composite polymerization inhibitor of the present invention is: mix and dissolve the substances in the A component, the B component and the C component according to the mass ratio of 1:0.5~10:1~10 in the organic solvent, at room temperature After fully stirring and dissolving evenly, it can be added to the monomer.

[0030]In industrial applications, the polymerization inhibitor can be added to the monomer in any common way, for example, it can be added in a countercurrent (relatively newly added monomer) mode at an appropriate position, and each component can also be added with the newly added monomer. The monomers are fed together to ensure efficient distribution of the inhibitor component in the monomer. Since the polymerization inhibitor is gradually consumed in the monomer rectification process, the polymerization inhibitor is appropriately supplemented in the rectification process to ensure that there is enough polymerization inhibito...

Embodiment 1

[0033] Each polymerization inhibitor was dissolved in styrene according to the formula ratio of 0.012 part SA, 0.05 part DNBP and 0.015 part OH-TEMPO (based on 100 parts of St) to prepare a polymerization inhibitor solution, and then added to the purified styrene , carry out the reaction under normal pressure at 120°C, take an appropriate amount of the reaction solution at regular intervals to measure the amount of polymer generated by the refractive index method, and the results of the reaction for 7 hours are shown in Table 1.

Embodiment 2

[0035] Each polymerization inhibitor was tested for the polymerization inhibition effect according to the method in Example 1 according to 0.013 part of SA, 0.05 part of DNBP and 0.015 part of TEMPO (based on 100 parts of St).

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Abstract

The invention discloses a polymerization inhibitor suitable for a vinyl aromatic compound, which can be applied in the processes of production, treatment, transportation and utilization of vinyl aromatic compounds. The compounded polymerization inhibitor is composed of an oxime compound, a nitrophenol compound and a nitroxide free radical compound and skilfully utilizes the respective advantages of a true polymerization inhibitor and a retarder; the synergy of components obviously improves inhibition effect, reduces use amount of highly toxic substances, lowers toxicity, improves solubility in the organic solvent and obtains good economic benefit.

Description

technical field [0001] The invention relates to a polymerization inhibitor, in particular to a high-efficiency composite polymerization inhibitor used in the production, handling, transportation and use of vinyl aromatic compounds. technical background [0002] Vinyl aromatic compounds such as styrene, α-methylstyrene and other lower alkylated styrenes contain many impurities such as benzene and toluene in the industrial production process, and they must be purified to remove them before they are used as monomers. In addition to these impurities, the purification method is generally completed by rectification. [0003] However, it is well known that vinyl aromatic compounds are highly reactive and can undergo self-polymerization at room temperature. They will polymerize in all stages of their refining, storage and use, and the polymerization rate increases rapidly with the increase of temperature, which will lead to single Body loss, pipeline blockage, resulting in higher m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/20C07C7/04C07C15/46
Inventor 詹晓力周薇张庆华陈丰秋
Owner ZHEJIANG UNIV
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