Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate
2005-03-15
2005-03-15
Richter, Johann R (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C562S606000, C562S607000, C562S608000
Reexamination Certificate
active
06867329
ABSTRACT:
The invention relates to a process for obtaining anhydrous or substantially anhydrous formic acid, in which firstly aqueous formic acid is prepared by hydrolysis of methyl formate and is freed from water in the subsequent work-up. The process has the special feature that steam, which is employed for the hydrolysis of methyl formate and for heating a distillation column serving for work-up, is also used as stripping steam for waste-water stripping. The stripped waste water is produced during work-up.
REFERENCES:
patent: 4326073 (1982-04-01), Wolf et al.
patent: 17 866 (1980-10-01), None
Derwent Abstract of Japan XP-002175587.
Ullmanns Encyclopedia of Ind.Chem.5thEd.,vol. A12,16-24.
Ullmanns Encyclopedia of Ind.Chem.4thEd.vol. 4,365-366.
Adrian Till
Auer Heinz
Bessling Bernd
Hammer Hans
Hasse Hans
BASF - Aktiengesellschaft
Keil & Weinkauf
Puttlitz Karl
Richter Johann R
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