Process for cleaning electronic or precision parts and recycling

Details Process for cleaning electronic or precision parts and recycling Process for cleaning electronic or precision parts and recycling

1993-08-27

1994-09-27

Dean, Richard O.

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

134 1, 134 26, 134 40, B08B 308, B08B 312

Patent

active

053504577

ABSTRACT:
A detergent composition which can effectively cleanse electronic and precision parts and produces waste effluent water which is very easily treated is disclosed. The detergent composition comprises one or more nonionic surface active agents and, when diluted with water to a concentration of 5%, the aqueous solution has a cloud point of 5.degree.-100.degree. C. Disclosed is also a process for cleansing electronic and precision parts comprising the steps 1) to 3): 1) cleaning the electronic and precision parts with a detergent composition comprising one or more nonionic surface active agents and wherein a 5% by weight of aqueous solution of said detergent composition has a cloud point of 5.degree.-100.degree. C., or with an aqueous solution of this detergent composition, at a temperature below said cloud point, 2) rinsing the electronic and precision parts with a rinse water resulted in step 1) at a temperature of 5.degree.-100.degree. C., and 3) heating the rinse waste water to a temperature above its cloud point; thereby separating the oil components contained therein.

REFERENCES:
patent: 2711978 (1955-06-01), Groom
patent: 3025190 (1962-03-01), Groom
patent: 3734776 (1973-05-01), Keogh, Jr.
patent: 3802917 (1974-04-01), Treat et al.
patent: 4609488 (1986-09-01), Geke et al.
patent: 4651762 (1987-03-01), Bowden
patent: 5047083 (1991-09-01), Blake et al.
patent: 5096504 (1992-03-01), Chihara et al.
patent: 5125966 (1992-06-01), Siefert et al.

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