Utilization of an extracting agent as antifoaming agent in...

Details Utilization of an extracting agent as antifoaming agent in... Utilization of an extracting agent as antifoaming agent in...

2005-01-04

2005-01-04

McKane, Joseph K. (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

C562S606000, C562S608000

Reexamination Certificate

active

06838579

ABSTRACT:
The invention relates to a process for obtaining anhydrous or substantially anhydrous formic acid in which, during the work-up, a compound of the general formula Iwhere the radicals R1 and R2 are alkyl, cycloalkyl, aryl or aralkyl groups, or R1 and R2 jointly, together with the N atom, form a heterocyclic 5- or 6-membered ring, and only one of the radicals is an aryl group, and where R3 is hydrogen or a C1-C4-alkyl group,is employed simultaneously as extractant for formic acid and as antifoam for a distillation process.

REFERENCES:
patent: 4326073 (1982-04-01), Wolf et al.
patent: 4551208 (1985-11-01), Bott et al.
patent: 1 238 919 (1988-07-01), None
patent: 0 017 866 (1980-10-01), None
patent: 0 156 309 (1985-10-01), None

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