GB391156A - Improvements in or relating to the stabilisation of chlorinated hydrocarbons - Google Patents

Abstract

Chlorinated hydrocarbons containing two carbon atoms are stabilized by adding a small proportion of an alkylamine which prevents the liberation of acid in degreasing metals and fabrics. Suitable alkylamines are dibutylamine and mono-, di- and tri-ethylamine. If the boiling-point of the amine is near to that of the chlorinated hydrocarbon, the mixture may be distilled with little change; such a mixture is trichlorethylene and triethylamine. A small quantity of an alkaline substance such as lime or hydrated lime may be added, which is capable of decomposing the hydrochloride of the added amine. Apparatus parts in permanent contact with chlorinated hydrocarbons should not be made of copper or its alloys, but the treated solvent may be used for degreasing copper or brass articles, as the contact is of relatively short duration. Specification 205,110, [Class 47 (ii), Fire-extinguishing &c.], is referred to.ALSO:Chlorinated hydrocarbons containing two carbon atoms are stabilized by adding a small proportion of an alkylamine which prevents the liberation of acid in degreasing metals and fabrics. Suitable alkylamines are dibutylamine and mono-, di- and tri-ethylamine. If the boiling-point of the amine is near to that of the chlorinated hydrocarbon, the mixture may be distilled with little change; such a mixture is trichlorethylene and triethylamine. A small quantity of an alkaline substance such as lime or hydrated lime may be added which is capable of decomposing the hydrochloride of the added amine. Apparatus parts in permanent contact with chlorinated hydrocarbons should not be made of copper or its alloys, but the treated solvent may be used for degreasing copper or brass articles, as the contact is of relatively short duration. Specification 205,110, [Class 47 (ii), Fire-extinguishing &c.], is referred to.