Use of azeotropic compositions in vapor degreasing

Details Use of azeotropic compositions in vapor degreasing Use of azeotropic compositions in vapor degreasing

1991-02-04

1992-05-19

Morris, Theodore

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

134 31, 134 40, 252DIG9, B08B 500, B08B 305

Patent

active

051144956

ABSTRACT:
A vapor cleaning process for cleaning soil from solid articles comprising the use of an azeotropic vapor mixture of perchloroethylene and water as the cleaning agent which condenses on the articles and thus cleans them. Liquid perchloroethylene and water are placed in a lower portion of a degreasing chamber, the articles to be cleaned are introduced into an upper portion of the chamber, the perchloroethylene and water are heated and evaporated to form a minimum-boiling azeotropic vapor mixture, the vapor mixture is condensed on the articles whereby soil is removed from them, and the cleaned articles are then removed from the chamber.

REFERENCES:
patent: 2310569 (1942-05-01), Booth
patent: 3021235 (1962-02-01), Schumacher
patent: 3733218 (1973-05-01), Begun
patent: 3794524 (1974-02-01), Nogueira et al.
patent: 4289542 (1981-09-01), Roehl
patent: 4367098 (1983-01-01), McCord
patent: 4650493 (1987-03-01), Pahlsson et al.
patent: 4753735 (1988-06-01), Figiel
Chemical Abstracts 95(4):26498e, Minina et al.
Manual on Vapor Degreasing, Third Edition, ASTM Manual Series: MLN 2, Revision of Special Technical Publications (STP) 310 A, Jun. 1989.

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