Method for synthesizing antioxidant 1076 by use of novel titanium-containing catalyst

Abstract

A method for synthesizing an antioxidant 1076 by the use of a novel titanium-containing catalyst comprises the following steps: 2,6-phenol and methyl ester are subjected to an addition reaction to prepare 3,5-ester; 3,5-ester and octadecyl alcohol are subjected to an ester-exchange reaction to generate an antioxidant 1076; and finally, recrystallization is carried out to obtain a product. The method is characterized in that a catalyst used in the addition reaction and the ester-exchange reaction is a titanium-containing catalyst. The novel titanium-containing catalyst used in the invention has good catalytic performance in the ester-exchange reaction for synthesis of the antioxidant 1076. By the method, product content reaches 99% and above, light transmittance 425 nm reaches 98.8% and above, and yield reaches 97% and above. The novel titanium catalyst has more excellent performance than catalysts such as sodium methylate, potassium hydroxide, lithium amide, organo-tin and the like when used in the esterification reaction of the antioxidant 1076. By the use of the titanium catalyst, the reactions are accelerated, the process of aftertreatment-recrystallization is simplified, and high yield is obtained.

Description

Technical field: [0001] The present invention relates to a production method of chemical products, in particular to a method for synthesizing antioxidant 1076 with a novel titanium-containing catalyst. Background technique: [0002] Antioxidant 1076 is a phenolic oxidant. It is an excellent non-polluting and non-toxic antioxidant. It has good compatibility, no coloring, washing resistance, low volatility, and good heat resistance and water extraction resistance. Widely used in polyolefin, polyamide, polyester, polyvinyl chloride, ABS resin and various rubber and petroleum products. Antioxidant 1076 has a synergistic effect with ultraviolet absorbers, and is often used in conjunction with auxiliary antioxidant 168 to improve the antioxidant effect. [0003] According to the statistical information of the "Antioxidant Industry Conference", at present, dibutyltin is mainly used as a catalyst to synthesize antioxidant 1076 at home and abroad, but this method has a low reaction ...

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Problems solved by technology

[0003] According to the statistical information of the "Antioxidant Industry Conference", at present, dibutyltin is mainly used as a catalyst to synthesize antioxidant 1076 at home and abroad, but this method has a low reaction speed, complicated post-treatment recrystallization process, and low product yield.