Cleaning method and an apparatus thereof

Details Cleaning method and an apparatus thereof Cleaning method and an apparatus thereof

1988-03-15

1992-04-14

McFarlane, Anthony

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

134 15, 134 2219, 134 31, 134 38, 134 40, 134109, 134122R, B08B 308

Patent

active

051044544

ABSTRACT:
The cleaning method of the present invention comprises; (a) immersing a material to be cleaned in a mixed solvent contained in the first open vessel, wherein the mixed solvent consists of a chlorofluoro-hydrocarbon with a boiling point of 20.degree.-50.degree. C. and an organic solvent with a boiling point of 50.degree. C. or more higher than that of said chlorofluoro-hydrocarbon and compatible therewith, but not azeotropic therewith, and kept at a temperature within a range between the boiling point of the chlorofluoro-hydrocarbon and a temperature of at least 30.degree. C. lower than the boiling point of the organic solvent, (b) then transferring the material into a boiling liquid essentially consisting of said chlorofluoro-hydrocarbon contained in the second open vessel, (c) and taking out the material from the boiling liquid, (d) wherein, constituting a saturated vapor zone of the chlorofluoro-hydrocarbon by the evaporated vapor from the boiling liquid essentially consisting of the chlorofluoro-hydrocarbon and the mixed solvent in an open container equipped with cooling apparatus in the upper part and holding the open vessels in the lower part, (e) and keeping a constant state of the ratio of the chlorofluoro-hydrocarbon and the organic solvent in the mixed solvent, with a equilibrium of the evaporation of the chlorofluoro-hydrocarbon from the mixed solvent and its absorption from the saturated vapor zone of the chlorofluoro-hydrocarbon, by keeping the temperature of the mixed solvent at a constant temperature.

REFERENCES:
patent: 4341567 (1982-07-01), Roehl
patent: 4442851 (1984-04-01), Holm
patent: 4486239 (1984-12-01), du Fresne
patent: 4605027 (1986-08-01), Dallot

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