Waste water treatment in a method for producing formic acid...

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof

Reexamination Certificate

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C562S606000, C562S607000, C562S608000

Reexamination Certificate

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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.

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