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1. 发明授权

US3928430A Method for the preparation of 3,3-methylenebis (benzoic acid) 失效
标题翻译：制备3,3-亚甲基双（苯甲酸）的方法
公开(公告)号：US3928430A
公开(公告)日：1975-12-23
申请号：US49020774
申请日：1974-07-19
申请人： KOPPERS CO INC
发明人： MRUK NORBERT J
IPC分类号： C07C51/353 , C07C51/48 , C07C63/33
CPC分类号： C07C51/353 , C07C51/48 , Y02P20/582 , C07C63/331
摘要： A method for the preparation of 3,3''-methylenebis (benzoic acid) which comprises reacting a mixture of benzoic acid and formaldehyde in the presence of dilute sulfuric acid at a temperature between 70* and 120*C. and preferably as a heterogeneous mixture. The heterogeneous reaction mixture comprising two solid components and an acid phase is filtered to provide the reaction product methylenebis (benzoic acid) and unreacted benzoic acid and the acidic filtrate. The acidic filtrate is recycled to the reaction vessel for use in a subsequent reaction. Water at temperatures between 60* and 100*C. is added to the mixture of methylenebis (benzoic acid) and benzoic acid to form an aqueous solution of benzoic acid and undissolved 3,3''-methylenebis (benzoic acid). The aqueous solution is filtered to provide 3,3''-methylenebis (benzoic acid). The aqueous filtrate is cooled and the benzoic acid which precipitates is filtered and recycled to the reaction vessel for use in a subsequent reaction, and the water is reused in subsequent extractions.
摘要翻译：一种制备3,3'-亚甲基双（苯甲酸）的方法，其包括在稀硫酸存在下，在70-120℃的温度下使苯甲酸和甲醛的混合物反应，优选作为非均相混合物。将包含两个固体组分和酸相的非均相反应混合物过滤，得到亚甲基双（苯甲酸）和未反应的苯甲酸和酸性滤液的反应产物。将酸性滤液再循环到反应容器中，用于随后的反应。加入温度在60℃和100℃之间的水，加入到亚甲基双（苯甲酸）和苯甲酸的混合物中以形成苯甲酸的水溶液和未溶解的3,3'-亚甲基双（苯甲酸）。将水溶液过滤，得到3,3'-亚甲基双（苯甲酸）。将含水滤液冷却，将沉淀的苯甲酸过滤并再循环至反应容器中用于随后的反应，并在随后的萃取中重复使用水。

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