Method of extracting perchlorethylene from dry cleaner filter ca

Details Method of extracting perchlorethylene from dry cleaner filter ca Method of extracting perchlorethylene from dry cleaner filter ca

1983-09-14

1985-02-19

Cintins, Ivars

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

34 9, 134 11, 210673, 210282, B01D 4102

Patent

active

045003637

ABSTRACT:
This invention relates to a new and unique method for the extraction and reclamation of perchlorethylene dry cleaning solvent from spent dry cleaner filter cartridges which utilize a layer of activated charcoal and paper filter media to perform the filtering function. The spent filter cartridges are separated into component parts. The charcoal and paper filter media are separated, collected and immersed in a boiling liquid solution contained in a boiling sump. The resulting perchlorethylene-laden vapors are collected and condensed to form a condensate. The condensate is allowed to settle by gravity into two homogeneous layers the upper layer of which contains water and the lower layer of which contains perchlorethylene in order to separate and collect the perchlorethylene for reuse or sale. The water in the upper layer is recycled into the boiling sump for reuse. The charcoal and filter media components are removed from the boiling sump, dried, and collected for recycling or sale.

REFERENCES:
patent: 3670424 (1972-06-01), Hofer et al.
patent: 3683511 (1972-08-01), Johnson et al.
patent: 4014104 (1977-03-01), Murphy
patent: 4138337 (1979-02-01), Smith
patent: 4212112 (1980-07-01), LaDelfa et al.

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