Title:
METHOD OF OBTAINING HYDROGEN CHLORIDE GAS FROM DILUTED AQUEOUS SOLUTION OF HYDROCHLORIC ACID
Document Type and Number:
Japanese Patent JPS55162402
Kind Code:
A
Abstract:
Gaseous hydrogen chloride is extracted from dilute aqueous hydrochloric acid using amines, by: (a) extracting the aqueous hydrochloric acid with an amine or with a mixture of an amine and an inert, water-immiscible solvent having a boiling point of at least 120 DEG C., tertiary alkylamines being used containing 14 to 36 carbon atoms in the nitrogen-bound side chains, the side chains having at most one nitrogen-bound methyl group and at least one nitrogen-bound aliphatic group containing at least 6 carbon atoms, where the amine acid constant is less than 10-3; (b) adding an inert, water-immiscible solvent having a boiling point of at least 120 DEG C. to the extract, unless the solvent already was added in stage (a), (c) distilling the extract, condensing the vapors generated, continuously separating the water from the two-phase condensate and feeding back the organic phase into the distillation procedure; (d) carrying out an aminohydrochloride cleavage step by distilling the extract at reflux after removing the water and evacuating the gaseous hydrogen chloride released at the head of the column or by separating the hydrogen chloride from the extract after removing the water at less than the boiling point of the solvent by passing an inert gas flow therethrough; (e) feeding back the solvent containing the amine into the extracting procedure; and (f) adding carboxylic acid chlorides at least in stoichiometric quantities referred to primary and secondary amines formed from thermal dissociation of the alkylamines, solvent and any impurities before, during or after step (d).
Inventors:
UIRII TSUIIGENBAIN
FUERUDEINANTO FUON PURAUN
FUERUDEINANTO FUON PURAUN
Application Number:
JP7088280A
Publication Date:
December 17, 1980
Filing Date:
May 29, 1980
Export Citation:
Assignee:
HUELS CHEMISCHE WERKE AG
International Classes:
C01B7/01; C01B7/07; B01D59/22; (IPC1-7): B01D59/22; C01B7/01