Antioxidant 2,2′-methylene-bis(4-ethyl-6-tert-butylphenol) is synthesized by condensation of formalin and 4-ethyl-2-tert-butylphenol which is prepared by alkylation of p-ethylphenol with isobutylene in the presence of phosphoric acid or ion-exchange resin as catalysts.
研究了以对乙基苯酚、叔丁醇为原料,在酸性条件下,进行烷基化反应,合成2 叔丁基 4 乙基苯酚,再进一步缩合成抗氧剂425的工艺条件。
