Method for producing butadiene from n-butane

Details Method for producing butadiene from n-butane Method for producing butadiene from n-butane

2005-12-19

2009-02-24

Dang, Thuan Dinh (Department: 1797)

Chemistry of hydrocarbon compounds

Plural serial diverse syntheses

To produce unsaturate

C585S616000, C585S621000, C585S628000, C585S629000

Reexamination Certificate

active

07495138

ABSTRACT:
A process for preparing butadiene, comprising nonoxidatively dehydrogenating n-butane from a stream (a) in a first dehydrogenation zone to obtain stream (b) comprising 1-butene, 2-butene, and butadiene; oxidatively dehydrogenating the 1-butene and 2-butene of (b) in the presence of an oxygenous gas in a second dehydrogenation zone to obtain stream (c) comprising n-butane, butadiene, hydrogen, and steam; compressing and cooling (c) to obtain stream (d2) comprising n-butane, butadiene, hydrogen, and steam; extractively distilling (d2) into stream (e1) comprising butadiene and stream (e2) comprising n-butane, hydrogen, and steam; optionally compressing and cooling (e2) to obtain stream (f1) comprising n-butane and water and stream (f2) comprising n-butane and hydrogen and optionally recycling (f1) into the first dehydrogenation zone; separating (f2) into stream (g1) comprising n-butane and stream (g2) comprising hydrogen by contacting (f2) with a high boiling absorbent and subsequently desorbing the gas constituents dissolved in the absorbent.

REFERENCES:
patent: 4504692 (1985-03-01), Arakawa et al.
patent: 2005/0171311 (2005-08-01), Schindler et al.
patent: WO-2004/007408 (2004-01-01), None

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