Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2011-01-11
2011-01-11
Witherspoon, Sikarl A (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S852000, C568S861000
Reexamination Certificate
active
07868212
ABSTRACT:
The invention relates to a method for preparing 1,2-propanediol by reacting glycerol, which has a purity of at least 95 wt %, with hydrogen at a hydrogen pressure from 20 to 100 bar and a temperature from 180 to 240° C. in the presence of a catalyst, which comprises 20 to 60 wt % of copper oxide, 30 to 70 wt % of zinc oxide and 1 to 10 wt % manganese oxide in an autoclave.
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Franke Oliver
Stankowiak Achim
Clariant Finance (BVI) Limited
Waldrop Tod A.
Witherspoon Sikarl A
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