2013•Journal of Zhejiang University of TechnologyRequires access
Synthesis of 3,3′-Methylene-bis[6-hydroxybenzoic acid]
Gao Jian-rong
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Abstract
The 3,3′-Methylene-bis[6-hydroxybenzoic acid],a light stabilizer,was synthesized from salicylic acid and 37% formaldehyde solution,25% phosphoric acid as catalyst.The effects of materials ratio,temperature,reaction time on the synthesis were studied.The proper technological conditions were given as follows:the molar ratio of salicylic acid and formaldehyde was 1∶0.58,the reaction temperature was 98 ℃,and the reaction time was 9 h.The product was characterized by infrared spectroscopy and 1HNMR,confirmed its structure.The yield of the product could be reached more than 89.4%,purity of the product was 97.6%.