Method for producing butadiene from n-butane

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

2005-11-11

2008-08-26

Dang, Thuan Dinh (Department: 1797)

Chemistry of hydrocarbon compounds

Plural serial diverse syntheses

To produce unsaturate

C585S616000, C585S621000, C585S628000, C585S629000

Reexamination Certificate

active

07417173

ABSTRACT:
Processes for producing butadiene from n-butane comprising: (a) providing a feed gas stream comprising n-butane; (b) non-oxidatively dehydrogenating the feed gas stream in the presence of a catalyst in a first dehydrogenation zone to form a first intermediate gas stream comprising n-butane, 1-butene, 2-butene, butadiene and hydrogen; (c) oxidatively dehydrogenating the first intermediate gas stream in the presence of an oxygenous gas having an oxygen content of at least 75% by volume in a second dehydrogenation zone to form a second intermediate gas stream comprising n-butane, butadiene, hydrogen, carbon dioxide and steam; (d) compressing and cooling the second intermediate gas to form a first condensate stream comprising water and a third intermediate gas stream comprising n-butane, butadiene, hydrogen, carbon dioxide and steam; (e) compressing and cooling the third intermediate gas to form a second condensate stream comprising n-butane, butadiene and water and a fourth intermediate gas stream comprising n-butane, butadiene, hydrogen and carbon dioxide; (1) cooling the fourth intermediate gas stream to form a third condensate stream comprising n-butane and butadiene, and an offgas stream comprising carbon dioxide and hydrogen; (g) removing water from the second condensate stream and combining the second condensate stream and third condensate stream to form a C4hydrocarbon stream comprising n-butane and butadiene; and (h) separating the C4hydrocarbon stream to form a recylce stream comprising n-butane and a product stream comprising butadiene; wherein at least a portion of the recycle stream is fed to the first dehydrogenation zone.

REFERENCES:
patent: 3161670 (1964-12-01), Adams et al.
patent: 4595788 (1986-06-01), Yamamoto et al.
patent: 4718986 (1988-01-01), Comiotto et al.
patent: 2005/0171311 (2005-08-01), Schindler et al.
patent: WO-2004/007408 (2004-01-01), None

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