Abstract: 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; and a 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.

Abstract: 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:

Abstract: A process for producing a methyl methacrylate is provided, which comprises the steps of (i) decomposing methyl t-butyl ether to obtain an isobutylene and a methanol, (ii) oxidizing the isobutylene to obtain at least one compound selected from a methacrylic acid and a methacrolein and (iii) esterifying at least one compound selected from the methacrylic acid and the methacrolein with the methanol to produce a methyl methacrylate. The process in the present invention successfully results in effective use of methanol resources.