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Halide Catalyzed Photoactinic Decomposition of Persulfates

IP.com Disclosure Number: IPCOM000085790D
Original Publication Date: 1976-Jun-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Sulich, J: AUTHOR

Abstract

A method of treatment of copper containing sodium persulfate etchant solutions is described in the November 1975 issue of the IBM Technical Disclosure Bulletin, Volume 18, No. 6, at page 1819. This process using a bisulfate salt requires elevated temperatures on the order of 90 degrees C and rather long reaction times.

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Halide Catalyzed Photoactinic Decomposition of Persulfates

A method of treatment of copper containing sodium persulfate etchant solutions is described in the November 1975 issue of the IBM Technical Disclosure Bulletin, Volume 18, No. 6, at page 1819. This process using a bisulfate salt requires elevated temperatures on the order of 90 degrees C and rather long reaction times.

Rather than using large amounts of thermal energy to elevate the solution to a suitable heat of activation for the reaction to take place, the process is modified to incorporate the selectivity of actinic irradiation and catalysis to accomplish the same result.

This is done by taking the waste treatment solutions, adding traces of halide such as bromides and iodides to the solution and then passing the solution through an irradiation chamber therein subjecting it to actinic light irradiation. If necessary, the solution can be recirculated until the oxidant is reduced below the established critical level.

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