Removal of methanol from methyl tertiary butyl ether
US5576464A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 8, 1995 |
| Grant date | Nov 19, 1996 |
| Priority date | — |
| Expiry date | Aug 8, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C41/42
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
MTBE, prepared by reacting MeOH with TBA to form a primary etherification reaction product, is distilled in a first distillation column to provide a first lower boiling distillation fraction comprising methyl tertiary butyl ether, isobutylene, methanol, dimethyl ether, and the first lower boiling fraction is water washed to provide an overhead extract that is distilled in a second distillation column to provide a second lower boiling distillation fraction comprising isobutylene, dimethyl ether and water, which is dewatered to provide a feed fraction comprising isobutylene and dimethyl ether that is reacted with less than an equivalent amount of MeOH to provide a secondary reaction product comprising MTBE, less than 0.5 wt. % of MeOH, isobutylene and contaminants including TBA and dimethyl ether, and the secondary reaction product is recycled to the second distillation column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.