Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1990-02-16
1991-03-12
Hruskoci, Peter
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210724, 210738, 210743, C02F 152
Patent
active
049991140
ABSTRACT:
A chemical mixture for 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 surface absorption 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 filtered out for disposal.
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Brochure from Inland Specialty Chemical Comp. on "Novatreat".
Brochure from J & S Laboratories on the Treatment of Spent Strippers.
Rose, "Dryfilm Resist Stripping", Printed Circuit Fabrication, vol. 10, No. 5, May 1987, pp. 55 and 58.
Hruskoci Peter
Morton International
Paul, Jr. Edwin H.
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