Method for treating, spent dryfilm stripping and developing solu

Details Method for treating, spent dryfilm stripping and developing solu Method for treating, spent dryfilm stripping and developing solu

1987-11-02

1989-08-15

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210738, 210743, C02F 152

Patent

active

048572063

ABSTRACT:
A method of treating spent dryfilm stripper and developer solutions by mixing the spent solutions with a solution of aluminum sulfate and borax in controlled amounts causing a reaction which results in a slurry of a non-sticky, benign precipitate in a supernatant liquid. The supernatant liquid contains the dissolved heavy metals. The non-sticky precipitate does not interfere with the ph measurement which indicates when the reaction is complete, and the benign precipitate can be fillered out for disposal.

REFERENCES:
patent: 3835045 (1974-09-01), Hussissian
patent: 4008162 (1977-02-01), Korenowski et al.
patent: 4465593 (1984-08-01), Wemhoff
patent: 4724084 (1988-09-01), Pahmeier et al.
Brochure from INLAND SPECIALTY CHEMICAL CO. on "Novatreat".
Brochure from J&S LABORATORIES on the treatment of spent strippers.
An article by Mr. Peter R. Rose in the magazine "PRINTED CIRCUIT FABRICATION", vol. 10, No. 5, May 1987, titled Dryfilm Resist Stripping, pp. 55 and 58.

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