PROCESS FOR PREPARING ISOBUTYLENE FROM METHYL- OR ETHYL- TERT-BUTYL ETHER Russian patent published in 1997 - IPC

FIELD: production of butyl rubber. SUBSTANCE: claimed invention describes process for preparing isobutylene from methyl- or ethyl-tart-butyl ether by contacting it with acid heterosogeneous catalyst in reaction rectification column with resulting isobutylene distilled off continuously at the apparatus top and then purified and with alcohol taken from the apparatus bottom. The initial ether is fed not lower than to the middle of catalyst bed. Process is carried out at temperature in the catalyst bed maintained at 45- 80 C and pressure at apparatus top maintained from 1.0 to 3.0 atm. isobutylene taken from the top is subjected to aqueous washing from alcohol and initial ether and dialkyl ether. EFFECT: more efficient preparation process. 5 cl, 1 dwg