Process for separating isobutylene from C.sub.4 hydrocarbon mixt

Details Process for separating isobutylene from C.sub.4 hydrocarbon mixt Process for separating isobutylene from C.sub.4 hydrocarbon mixt

1974-12-13

1976-09-07

Levine, Herbert

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260677A, C07C 1108

Patent

active

039794741

ABSTRACT:
An improvement in the process for separating isobutylene from a mixture of C.sub.4 hydrocarbon by extracting with sulfuric acid, characterized in that the C.sub.4 hydrocarbon mixture is extracted at a temperature between about 30.degree. and 45.degree.C by means of about 40 - 55 percent by weight sulfuric acid in a first stage, whereupon the extract thus obtained is converted into isobutylene and into sulfuric acid, the residual mixture of C.sub.4 hydrocarbons after separating the entrained tertiary butyl alcohol is extracted in a second stage at a temperature between about 10.degree. and 25.degree.C by means of about 60 - 70 percent by weight sulfuric acid, the extract thus obtained being separated into sulfuric acid and into hydrocarbons (dimers and trimers).

REFERENCES:
patent: 2424186 (1947-07-01), Packie et al.
patent: 2961472 (1960-11-01), Welch et al.
patent: 3005856 (1961-10-01), Gislon et al.

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