Assertion: benzoic acid's purity | /r/HasProperty | improved
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text: The positively effect that the present invention has: (1) the present invention finds that Diisopropylamine can react with phenyl lithium, therefore, adding Diisopropylamine before adding O-chloro-benzoic acid ester or O-bromo-benzoate falls the phenyl lithium complete reaction that cracking generates, thereby establishment the generation of side reaction, thereby greatly improved reaction yield.(2) the present invention adopts triphenylphosphine as reaction raw materials, than diphenyl phosphine chloride, greatly reduces production cost.(3) all be acidizing neutralization immediately after the alkaline hydrolysis by ester to acid generally, and the present invention is after the alkaline hydrolysis before the acidizing neutralization, with the reaction solution after the washed with dichloromethane hydrolysis, because the O-diphenylphosphine Sodium Benzoate that this moment reaction produces is water-soluble but be insoluble to methylene dichloride, like this can be with the Impurity removal in the reaction solution, thus purity can be improved about 0.5%.