In process purification of dry cleaning solvents

Details In process purification of dry cleaning solvents In process purification of dry cleaning solvents

1976-02-11

1978-03-07

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

8142, 210 60, 210 63R, 210167, 210243, 210282, 210507, 252104, 252163, 252172, B01D 3904

Patent

active

040778789

ABSTRACT:
Residual moisture and sulfur and other residual reducing agent impurities contained in dry cleaning solvents are removed by adding to the solvents an unsubstituted aromatic hydrocarbon or a halogen or alkyl-substituted aromatic hydrocarbon and a cellulosic container device. The cellulosic container device comprises a cellulosic bag which contains another cellulosic material on which has been coated a chromate compound, the chromate compound being sealed onto the cellulosic material by use of a polymeric material or a cellulosic gum, the cellulosic bag also having attached thereto one or more copper wires to provide a continuous electrical ground to the vessel containing the solvent or to a D.C. power supply. The same cellulosic container device can be added to petroleum liquids together with naphthalene and fatty acids to remove sulfur impurities therefrom.

REFERENCES:
patent: 2475418 (1949-07-01), Aitchison
patent: 2729576 (1956-01-01), Trusler
patent: 3212641 (1965-10-01), Komarmy et al.
patent: 3231324 (1966-01-01), Young
patent: 3658459 (1972-04-01), Gartlan
patent: 3724177 (1973-04-01), Grote
patent: 3766075 (1973-10-01), Jackson

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