Method of vapor degreasing

Details Method of vapor degreasing Method of vapor degreasing

1980-06-30

1981-09-15

Caroff, Marc L.

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

134 31, 134 40, 570122, B83

Patent

active

042895421

ABSTRACT:
A contaminated article is subjected to vapor degreasing operations wherein the vapor degreasing solvent comprises a blend consisting essentially of perchlorethylene and trichlorethylene, wherein in the preferred embodiment, the perchlorethylene comprises about 81 volume percent of the degreasing solvent, while the trichlorethylene comprises the remaining 19 volume percent of the solvent blend.
The solvent blend extends the normal life of perchlorethylene degreasing solvents alone, or in combination with stabilizers and the like, or, alternatively, allows the utilization of trichlorethylene at temperatures higher than those that would normally cause pyrolysis. The degreasing solvent blend not only extends the operational life of perchlorethylene-based vapor degreasing solvents, but also reduces the cost of conducting vapor degreasing operations.

REFERENCES:
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patent: 2896640 (1959-07-01), Randall et al.
patent: 3028267 (1962-04-01), Edhofer et al.
patent: 3123083 (1964-03-01), Kearney et al.
patent: 3274700 (1966-09-01), Maguire et al.
patent: 3839087 (1974-10-01), Beckers
patent: 4046820 (1977-09-01), Goodner et al.

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