Process for purifying a C.sub.4 and/or C.sub.5 hydrocarbon cut c

Details Process for purifying a C.sub.4 and/or C.sub.5 hydrocarbon cut c Process for purifying a C.sub.4 and/or C.sub.5 hydrocarbon cut c

1982-04-23

1984-10-02

Bascomb, Wilbur

Distillation: processes, separatory

Convective distillation with normally gaseous medium, e.g., air

203 14, 203 94, 203 98, 208356, 585518, 585809, C07C 704

Patent

active

044746474

ABSTRACT:
A C.sub.4 and/or C.sub.5 olefinic hydrocarbon cut, containing dimethyl ether and water as impurities, in a relative proportion of dimethyl ether to water of at most 5:1, is purified in a distillation zone where it is introduced at an intermediate level, distant from the top or from the bottom thereof by at least 3 theoretical plates, optionally with a stripping gas, and separated into a overhead fraction comprising an aqueous liquid phase and a hydrocarbon liquid phase at least partially recycled as reflux to the upper part of the distillation zone, and a bottom fraction formed of the purified C.sub.4 and/or C.sub.5 olefinic cut.

REFERENCES:
patent: 2368497 (1945-01-01), Shipley et al.
patent: 2485329 (1949-10-01), Steele et al.
patent: 2994644 (1961-08-01), Clay
patent: 3225113 (1965-12-01), McNulty et al.
patent: 3296314 (1974-11-01), Statman et al.
patent: 3847756 (1980-08-01), Chase et al.
patent: 4218569 (1981-11-01), Mikitenko et al.
patent: 4299999 (1981-11-01), Mikitenko et al.

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