METHOD FOR COMBINED PREPARING METHYL-TERTIARY-BUTYL ESTER AND ISOBUTYLENE DIMERS Russian patent published in 2006 - IPC C07C41/06 C07C43/03 C07C2/08 

FIELD: organic chemistry, petroleum chemistry, chemical technology.

SUBSTANCE: method involves feeding isobutene-isobutylene-containing fraction to the combined synthesis of methyl-tert.-butyl ester and isobutylene dimmers by interaction with methanol at temperature 40-100 C in the presence of sulfocation-exchange resin as a catalyst. The combined esterification and oligomerization reaction is carried out in the mole ratio methanol : isobutylene = from 0.05-1.0 to 0.5-1.0 and volume rate of feeding reagents 2 h^-1, not less. Also, method involves separation of the prepared reaction mixture for methyl-tert.-butyl ester, fraction of isobutylene dimmers and depleted isobutene fraction. Fraction of dimmers is separated at stage of distinct distillation off or rectification under reduced pressure 0.007-0.02 MPa. Invention provides increase yield of the end products, i. e. methyl-tert.-butyl ester and isobutylene dimmers.

EFFECT: improved preparing method.