method of recovery of base and / or a volatile weak acid by a separation in two stages of basic and acidic compounds or their salts

摘要

A process for separating volatile bases (B'), e.g., NH3 and weak volatile acids (A'H), e.g., H2S from their salts or the liquid or gaseous dissociation products thereof, comprising, in a first step, contacting these salts or dissociation compounds with a nonvolatile AH acid, e.g., benzoic acid, in the presence of at least one liquid phase, at such a temperature and pressure that the volatile acid (A'H) is evolved in the form of a gas which is practically free of base (B') and acid (AH), and then, in a second step, increasing the temperature or reducing the pressure to liberate the volatile base (B') and regenerate the acid (AH), said liquid phase containing an alcohol having from six to 50 carbon atoms per molecule, an ester or ester of said alcohol, a polyalcohol having from two to 50 carbon atoms and two to 10 OH groups per molecule, an ester, ester or ester-ester of said polyalcohol, or a compound of the formula: R1-O-(R2-O)n-R3 in which each of R1 and R3 represents a hydrogen atom, a monovalent hydrocarbon radical having one to 20 carbon atoms or a monovalent radical R' CO in which R' is a monovalent hydrocarbon radical having two to 20 carbon atoms, R2 is a bivalent hydrocarbon radical having two to 10 carbon atoms and n is an integer from two to 50, the acid (AH) having under normal atmospheric pressure a boiling or sublimating point at least 50 DEG C. higher than that of the acid (A'H).