| 摘要 |
METHOD FOR THE REMOVAL OF DIMETHYL ETHER FROM METHYL TERTIARY BUTYL ETHER (Docket No. 81,234-F) An isobutylene feed mixture comprising MTBE, isobutylene and methanol is passed through an isobutylene conversion zone to form an isobutylene conversion product comprising unreacted methanol, unreacted isobutylene, dimethyl ether, MTBE and water, then charged to a countercurrent methanol extraction zone and contacting with water to provide an overhead raffinate comprising isobutylene, MTBE and water, and an extract comprising methanol, water, MTBE, isobutylene and dimethyl ether; the extract is distilled to provide a vaporized overhead fraction comprising MTBE, isobutylene, methanol, and dimethyl ether; the vaporized overhead fraction is partially condensed and from about 5 to 10 wt.% of the mixed phase condensate is vented to thereby provide a liquid condensate that is substantially free from dissolved dimethyl ether, and the condensate is recycled to the methanol extraction zone. |
