Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2004-12-04
2008-10-28
Seaman, D. Margaret (Department: 1625)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C549S429000
Reexamination Certificate
active
07442810
ABSTRACT:
A process for variably preparing mixtures of optionally alkyl-substituted BDO, GBL and THF by two-stage hydrogenation in the gas phase of C4dicarboxylic acids and/or derivatives thereof, which comprisesa) hydrogenating in a gas phase a gas stream of C4dicarboxylic acids and/or derivatives thereof over a particular catalyst at a particular pressure and temperature to give a stream mainly containing of optionally alkyl-substituted GBL and THF,b) removing any succinct anhydride,c) converting the products remaining predominantly in the gas phase in the partial condensation, THF, water and GBL to give a stream comprising a mixture of BDO, GBL and THF,d) removing the hydrogen from the products and recycling it into the hydrogenation,e) distillatively separating the products, THF, BDO, GBL and water, if appropriate recycling a GBL-rich stream or if appropriate discharging it, and working up BDO, THF and GBL distillatively,and setting the ratio of the products, THF, GBL and BDO, relative to one another within the range from 10 to 100% by weight of THF, from 0 to 90% by weight of GBL and from 0 to 90% by weight of BDO only by varying the temperatures in the two hydrogenation zones and also if appropriate the GBL recycle stream.
REFERENCES:
patent: 6248906 (2001-06-01), Bertola
patent: 6730800 (2004-05-01), Fischer et al.
patent: 6958404 (2005-10-01), Borchert et al.
patent: 7154011 (2006-12-01), Hesse et al.
patent: 7271299 (2007-09-01), Hesse et al.
patent: 100 61 556 (2002-06-01), None
patent: 0 373 947 (1990-06-01), None
patent: 2-233631 (1990-09-01), None
patent: 2639463 (1990-09-01), None
patent: 97/43234 (1997-11-01), None
patent: 99/35136 (1999-07-01), None
Hesse Michael
Junicke Henrik
Pinkos Rolf
Roesch Markus
Schlitter Stephan
BASF - Aktiengesellschaft
Chandrakumar Nizal S
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Seaman D. Margaret
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