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Process for Handling Perchloroethylene Inhibitor

IP.com Disclosure Number: IPCOM000049885D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Klein, DL: AUTHOR [+2]

Abstract

In this process whereby perchloroethylene is combined with an inhibitor, a material is formed that is more easily handled, shipped and maintained in inventory than the pure inhibitor.

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Process for Handling Perchloroethylene Inhibitor

In this process whereby perchloroethylene is combined with an inhibitor, a material is formed that is more easily handled, shipped and maintained in inventory than the pure inhibitor.

Perchloroethylene is commonly used as a solvent for various fabricating techniques, in particular to wash screening masks. Due to the cost of the solvent, and also environmental considerations, the solvent is reclaimed after use by distillation. It is necessary to maintain inhibitor levels normally used in perchloroethylene to values which will assure the stability of the solvent. Typical inhibitors are diallylamine and tripropylene. During the distillation reclamation, the diallylamine is depleted with usage while the tripropylene levels remain essentially constant. It is therefore necessary to make frequent additions of diallylamine to the perchloroethylene system.

In order to minimize the hazards of handling and shipping of pure diallylamine so as to maintain the inhibitor level in the mixture, perchloroethylene and diallylamine are handled and shipped in a ratio of 1:4.5 vol/vol. This composition is classified by the U.S. Department of Transportation as combustible rather than flammable and can be easily handled end shipped. The addition of the combination mixture to the solvent simplifies maintaining the right proportion of diallylamine in the solvent.

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