Production of tertiary butyl methyl ether

Details Production of tertiary butyl methyl ether Production of tertiary butyl methyl ether

1978-06-29

1980-04-15

Mars, Howard T.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568699, C07C 4106, C07C 4110, C07C 4112

Patent

active

041985303

ABSTRACT:
A mixed C.sub.4 hydrocarbon stream containing from 5 to 60% isobutene is mixed with methanol providing from about 2% to about 20% excess methanol (stoichiometry based on isobutene content) to provide fresh feed for preparing tertiary butyl methyl ether in a reaction zone containing acidic ion exchange catalyst. Formation of trouble-some amounts of diisobutylene is repressed by the presence of the excess methanol. The effluent comprising TBME, excess methanol, and unreacted C.sub.4 hydrocarbons is directed to a unique purification zone. The butenes are distilled from the effluent at a pressure from about 7 to 25 atmospheres, preferably at about 12 to 20 atmospheres. Surprisingly all of the excess methanol is azeotropically removed with the C.sub.4 hydrocarbons by the pressurized azeotropic distillation, leaving a bottoms consisting of a technical grade of TBME free from troublesome amounts of methanol.

REFERENCES:
patent: 2480940 (1949-09-01), Leun et al.
patent: 3119766 (1964-01-01), Voltz et al.
patent: 3940450 (1976-02-01), Lee
patent: 3979461 (1976-09-01), Ancillotti et al.
patent: 4039590 (1977-08-01), Ancillotti et al.
patent: 4090885 (1978-05-01), Lyons

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