申请人:Matsumoto Masami
公开号:US20130184497A1
公开(公告)日:2013-07-18
The present invention provides a method for producing ditrimethylolpropane which is characterized by the following (1) and (2): (1) a distillation still residue separated from purified trimethylolpropane is subjected to re-distillation under specific conditions to obtain a ditrimethylolpropane-containing solution having given contents of bis-TMP and tri-TMP; and (2) when subjecting the ditrimethylolpropane-containing solution to crystallization with an organic solvent, the crystallization is initiated under pressure at a temperature exceeding a boiling point of the organic solvent as measured under normal pressures, and the resulting crystallization product solution is cooled at a temperature drop rate of 2° C./min or less. According to the above method, it is possible to produce a high-purity ditrimethylolpropane from a distillation still residue obtained upon production of trimethylolpropane in a simple, industrially useful manner.
本发明提供了一种生产二三甲基三羟基丙烷的方法,其特征在于以下(1)和(2):(1)从纯化后的三甲基三羟基丙烷中分离出的蒸馏残渣,在特定条件下进行再蒸馏,以获得含有给定双TMP和三TMP含量的二三甲基三羟基丙烷溶液;(2)当将含有二三甲基三羟基丙烷的溶液用有机溶剂结晶时,在超过有机溶剂在常压下沸点的温度下施加压力,然后将产生的结晶产物溶液以2°C/min或更低的降温速率冷却。根据上述方法,可以以简单、工业上有用的方式从在生产三甲基三羟基丙烷时获得的蒸馏残渣中生产高纯度的二三甲基三羟基丙烷。