Process for separating alkanols from aqueous calcium chloride

Details Process for separating alkanols from aqueous calcium chloride Process for separating alkanols from aqueous calcium chloride

1980-04-21

1981-04-14

Evans, Joseph E.

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

Organic compounds

Oxygen containing

568699, 568918, 568923, C07C 2988, C07C 2986, C07C 4106, C07C 4138

Patent

active

042621496

ABSTRACT:
A C.sub.1 -C.sub.2 alkanol is separated from aqueous calcium chloride by adding a C.sub.4 or C.sub.5 hydrocarbon feed comprising an isoolefin to an aqueous solution of a calcium chloride-alkanol complex wherein the alkanol is methanol or ethanol at a temperature of about 80.degree.-120.degree. C. and a pressure of about 20-180 psig to provide an upper phase comprising the hydrocarbon feed and alkanol and a lower phase comprising aqueous calcium chloride. The invention is particularly useful as a step in a process for preparing and purifying methyl t-butyl ether by (1) reacting an excess of methanol with isobutylene or a C.sub.4 hydrocarbon stream containing isobutylene to form a crude reaction product comprising methyl t-butyl ether and excess methanol, (2) intimately mixing the crude reaction product with aqueous calcium chloride to complex the methanol and separate it from the ether, and (3) adding the hydrocarbon stream to extract the methanol from the aqueous calcium chloride-methanol complex solution.

REFERENCES:
patent: 1442520 (1923-01-01), Buc
patent: 2179991 (1939-11-01), Bright et al.
patent: 2595544 (1952-05-01), Rodman
patent: 3455664 (1969-07-01), Rosscup et al.
patent: 3940450 (1976-02-01), Lee

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