PROCESSES FOR THE PURIFICATION OF BIS(2-HYDROXYETHYL) TEREPHTHALATE
An object of the present invention is to provide a method of obtaining BHET of high purity efficiently from an EG (ethylene glycol) solution containing crude BHET (bis(2-hydroxyethyl)terephthalate), especially a decomposition product solution obtained by decomposing a polyester containing PET (polyethylene terephthalate) as a main component, by use of EG, while minimizing by-production of impurity components such as DEG (diethylene glycol), DEG ester and oligomers. The present invention is a method of purifying BHET by subjecting the decomposition product solution to crystallization and solid-liquid separation under specific temperature conditions. Further, the present invention is a method of purifying BHET which comprises evaporation steps of evaporating low-boiling-point components from the decomposition product solution under specific conditions so as to obtain a melt solution and a molecular distillation step of distilling the obtained melt solution under specific conditions so as to obtain a specific fraction.
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Page/Page column 29-31
(2010/02/10)
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