Two-stage method for producing butanediol with intermediated...

Details Two-stage method for producing butanediol with intermediated... Two-stage method for producing butanediol with intermediated...

2007-09-18

2007-09-18

Page, Thurman K. (Department: 1621)

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

Organic compounds

Oxygen containing

Reexamination Certificate

active

10516922

ABSTRACT:
Optionally alkyl-substituted 1,4-butanediol is prepared from C4-dicarboxylic acids and/or of derivatives thereof by:a) a gas stream of the C4-dicarboxylic acid or the derivative thereof in a first reactor in the gas phase to obtain a product which contains mainly optionally alkyl-substituted γ-butyro-lactone;b) removing succinic anhydride from the product of step a);c) catalytically hydrogenating the product of step b) in a second reactor in the gas phase to obtain optionally alkyl-substituted 1,4-butanediol;d) removing the desired product from intermediates, by-products and any unconverted reactants; ande) optionally recycling unconverted intermediates into one or both hydrogenation stages.The catalysts employed in each of the hydrogenation stages comprise ≦95% by weight of CuO, and ≦5% by weight of an oxidic support, and the second reactor has a higher pressure than the first reactor.

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