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Composite stabilizer for improving stability of tetrabromoethane

A composite stabilizer, tetrabromoethane technology, applied in the disproportionation separation/purification of halogenated hydrocarbons, organic chemistry, etc., can solve the problems of reduced pH, turbidity, structural instability, etc., to prevent product discoloration and avoid oxidation reactions , avoid the effect of influence

Active Publication Date: 2007-02-28
TIANJIN CHANGLU HAIJING GRP CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

Tetrabromoethane is unstable, and it is easy to deteriorate under normal temperature and light conditions. The pH of the deteriorated product decreases, and the color is reddish brown and turbid, so it can no longer be used as a cocatalyst.
[0003] In the molecular structure of tetrabromoethane, due to the strong electronegativity of the bromine atom, the hydrogen atom on the adjacent carbon atom has a positive charge, and this structure is very unstable.

Method used

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  • Composite stabilizer for improving stability of tetrabromoethane
  • Composite stabilizer for improving stability of tetrabromoethane
  • Composite stabilizer for improving stability of tetrabromoethane

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Embodiment Construction

[0028] The use process of the composite stabilizer for improving the stability of tetrabromoethane of the present invention will be described in conjunction with the accompanying drawings and examples.

[0029] The composite stabilizer for improving the stability of tetrabromoethane of the present invention is formed by physically mixing light stabilizers and antioxidants according to the ratio of 1:1 by weight, and the light stabilizers are 2-(3-tert-butyl -2-Hydroxy-5-butylphenyl)-5-chlorobenzotriazole, the antioxidant is 2,6-di-tert-butyl-p-cresol or 2,6-di-tert-butyl-4- Butylphenol. During use, add 2 to 4 g of the composite stabilizer per 150 kg of tetrabromoethane. It is obtained through experiments that the composite stabilizer can keep tetrabromoethane stable for a long time.

[0030] According to the mechanism of tetrabromoethane deterioration, the composite stabilizer of the present invention controls its stability, on the one hand to suppress the generation of free...

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Abstract

The invention discloses a composite stabilizer to improve stability of tetrabromoethane, which consists of optical stabilizer and anti-oxidant with weight rate at 1: 1, wherein the optical stabilizer is 2-(3-tertiary-butyl-2-hydroxyl-5-butyl phenylhydrazine)-5-azimido-chlorobenzene; the anti-oxidant is 2, 6-p-tert-butylcatechol or 2, 6-di-tert-butyl-4-butyl-phenol.

Description

technical field [0001] The invention relates to tetrabromoethane, in particular to a composite stabilizer for improving the stability of tetrabromoethane. Background technique [0002] Tetrabromoethane is a white or light yellow strong refractive liquid with iodoform smell, used to synthesize quaternary ammonium compounds, and used as a cocatalyst when p-xylene is oxidized to terephthalic acid in the polyester industry. Tetrabromoethane is unstable and easily deteriorates under normal temperature and light conditions. The pH of the deteriorated product decreases, and the color is reddish brown and turbid, so it can no longer be used as a cocatalyst. To analyze the reason for the deterioration of tetrabromoethane, the bond energy of C-C, C-H, and C-Br in the tetrabromoethane molecule is not high, and it is prone to cracking reaction under the action of light (especially ultraviolet light) and oxygen. It is the cause of its instability, which makes tetrabromoethane deteriorat...

Claims

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Application Information

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IPC IPC(8): C07C19/075C07C17/42
Inventor 李萌
Owner TIANJIN CHANGLU HAIJING GRP CO LTD
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