Process for producing isobutylene and methanol

摘要

A process for producing isobutylene and methanol, comprising decomposing methyl-tert-butylether into isobutylene and methanol, and separating into isobutylene and methanol, thereby individually recovering isobutylene and methanol, the process comprising the following steps:a first step of subjecting methyl-tert-butylether to decomposition in the presence of a solid acid catalyst;a second step of washing the resultant with water to separate into an oil layer and a water layer;a third step of subjecting the oil layer to distillation to obtain a fraction from the top of the distillation column and a fraction from the bottom thereof; anda fourth step of subjecting the water layer to distillation to obtain a fraction containing methanol from the top of the distillation column, a fraction containing water from the bottom thereof and a fraction rich in tert-butanol from a side cut thereof, and then recycling a part or whole of the fraction from the side cut to the first step.