Cleaning with liquid gases

Details Cleaning with liquid gases Cleaning with liquid gases

1996-03-15

1998-06-02

Diamond, Alan

Bleaching and dyeing; fluid treatment and chemical modification

Cleaning or laundering

Dry cleaning

8137, 81491, 8158, 8159, 134 2218, 134 34, 134 42, 134 254, D06L 100, D06L 102, B08B 308

Patent

active

057592098

ABSTRACT:
A method for cleaning objects in a pressure vessel with liquefied gases is provided. The gas liquefied under pressure is conducted into the pressure vessel. The temperature of the liquefied gas then, or beforehand, is lowered below the critical temperature of the gas and cleaning is performed at least primarily below the critical temperature and below the critical pressure of the gas. Carbon dioxide at temperatures between -20.degree. C. and +20.degree. C. is especially suitable. The mechanical interactions produced by the increased density and viscosity of the liquefied gas reinforce cleaning. Reduced solvent capacity does not influence the effectiveness of the cleaning. Textiles or components can therefore be cleaned at lower pressure and temperature.

REFERENCES:
patent: 5267455 (1993-12-01), Dewees et al.
patent: 5467492 (1995-11-01), Chao et al.
Kirk-Othmer Encyclopedia of Chemical Technology, 3rd ed., vol. 4, p. 737 (month unknown), 1978.

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