Liquid purification or separation – Processes – Separating
Patent
1986-10-31
1989-12-05
Fisher, Richard V.
Liquid purification or separation
Processes
Separating
210774, 134 12, 203 4, 203 39, 203 95, 203 97, 203DIG16, 202170, 202175, 202200, 202233, B01D 4102, B08B 704
Patent
active
048850993
ABSTRACT:
A closed circuit solvent stripping and reclaiming apparatus for recovering solvent from filters used in dry cleaning machines comprising a steam cabinet (2), and condenser (3), a water solvent separator (4), a recirculating tank (5), a blower (6) and a carbon bed adsorber (7). Dry cleaning filters are disassembled and their constituents separated and placed in foraminous trays (9) inside the steam cabinet (2). The filter material is agitated with a shaker and alternately subjected to dry heat, vaporized recycled solvent saturated water, and live steam. Steam and solvent vapors derived from the filters are conducted to a condenser (3) for liquification followed by separation in the water solvent separator (4). Solvent is thereby reclaimed and solvent saturated water is collected and stored in the recycling tank for reintroduction into the steam cabinet for subsequent stripping cycle. Upon completion fo the live steam stripping step, air is conducted into the steam cabinet, heated and passed through the filter material. Residual solvent vapors are then conducted via a blower (6) to a carbon bed adsorber so that only solvent-free air is vented to the atmosphere. The carbon bed adsorber (7) is periodically desorbed with live steam and the vapors are returned to the condenser (3) for liquification and separation in the solvent water separator (4). Excess solvent saturated water may be drained from the recycling tank or reintroduced into the steam cabinet where it is vaporized. These vapors are then conducted via the blower (6) to the adsorber (7) for adsorption.
REFERENCES:
patent: 3089250 (1963-05-01), Victor
patent: 3332854 (1967-07-01), Duckstein
patent: 3362888 (1968-01-01), Ricigliano
patent: 4444625 (1984-04-01), Smith
Fisher Richard V.
J.A.C. Corporation
Nessler Cynthia L.
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