GB359234A - Process for absorbing carbon monoxide and/or diolefines from gases and vapours - Google Patents

Abstract

Carbon monoxide and/or diolefines are recovered from gases or vapours by bringing them into contact with a neutral solution of a cuprous salt, such as cuprous chloride or formate, containing a substance which prevents the formation of cupric salt, e.g. a reducing agent such as hydroxylamine hydrochloride, hydroquinone, sulphites, or stannous chloride. The neutral solvent for the cuprous salt consists for example of an alkali or alkaline-earth metal or magnesium salt dissolved in a neutral liquid as water or p alcohol. The absorbed compounds may be recovered by heating the liquid, e.g. to 40-80 DEG C., or by applying reduced pressure, or both. In the case of mixed gases, the components may be separated by fractional release under reduced pressure. The separation of the addition compounds may be prevented by working temperatures above 10 DEG C., and by using concentrated solutions, especially of the alkali or other salt used to form the neutral solution. The separation of the carbon monoxide addition product may also be avoided by the addition of an acid amide, e.g. urea or acetamide to the solution. The use of iron in the apparatus is avoided since this would precipitate the copper, and the apparatus is preferably made of stainless steels, lead, or the like.ALSO:Diolefines are removed from gases or vapours by bringing them into contact with a neutral solution of a cuprous salt, such as cuprous chloride or formate, containing a substance which prevents the formation of cupric salt, e.g. a reducing agent such as hydroxylamine hydrochloride, hydroquinone, sulphites or stannous chloride. The neutral solvent for the cuprous salt consists, for example, of an alkali or alkaline-earth metal or magnesium salt dissolved in a neutral liquid as water or alcohol. The absorbed compounds may be recovered by heating the liquid, e.g. to 40-80 DEG C. or by applying reduced pressure or both. In the case of mixed gases, the components may be separated by fractional release under reduced pressure. The separation of the addition compounds may be prevented by working at temperatures above 10 DEG C. and by using concentrated solutions, especially of the alkali or other salt used to form the neutral solution. The use of iron in the apparatus is avoided since this would precipitate the copper, and the apparatus is preferably made of stainless steels, lead, or the like.