Hydrochloric acid purification process
AssigneeArkema France
InventorsBertrand Collier, Dominique Deur-Bert, Joaquin Lacambra, Anne Pigamo
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Abstract
The invention relates to a process for the treatment of a gas stream comprising hydrochloric acid, hydrofluoric acid and fluorinated/oxygenated compounds, in which the gas stream is successively subjected to: a stage of catalytic hydrolysis; a stage of washing with an acid solution; a stage of adsorption of impurities by active charcoal; a stage of adiabatic or isothermal absorption of the hydrochloric acid in an aqueous solution, making it possible to collect hydrochloric acid solution.
Claims11
A process for treating a gas stream comprising hydrochloric acid, hydrofluoric acid and fluorinated-oxygenated compound, comprising successively subjecting the gas stream to the following stages:
- hydrolyzing in the presence of a catalyst;
- washing with acid solution;
- adsorbing impurities by active charcoal;
- and
- absorbing the hydrochloric acid in an aqueous solution by adiabatic or isothermal absorption to collect hydrochloric acid solution;
- wherein the fluorinated-oxygenated compound comprises carbonyl difluoride, carbonyl chloride fluoride, trifluoroacetyl fluoride and/or trifluoroacetic acid.
Dependencies are inferred from the claim text.