PREPARATION OF A MOTOR SPIRIT BLENDING COMPONENT

摘要

A motor spirit blending component is prepared by reacting a hydrocarbon feedstock containing isobutene and reactive tertiary olefins of higher carbon number and having a final boiling point of at least 150 DEG C with a lower aliphatic alcohol. The reaction is carried out in the presence of an etherification catalyst under a temperature in the range 30 DEG to 200 DEG C, a pressure in the range atmospheric to 100 bar, a liquid hourly space velocity in the range 0.1 to 20 vol/vol/hour and a molar ratio of alcohol to reactive C4-C7 tertiary olefins in the range 0.1:1 to 10:1. The product contains a mixture of tertiary ethers. Suitable feedstocks are cat cracker debutaniser and steam cracker depropaniser feed. The preferred alcohol is methanol.