Purification of the hydrochloric acid by-product of the synthesis of methanesulphonic acid
AssigneeElf Atochem S.A.
InventorsJean Ollivier, Rene Clair, Denise Molines, Marc Ferrigno
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Abstract
In order to remove the methanesulphonyl chloride entrained by the gaseous HCl by-product, an amount of water ranging from 0.01 to 20%, relative to the mass of HCl to be treated, is injected into the HCl gas flow and the temperature is lowered to a value below or equal to 15° C.
Claims4
Process for purification of the HCl gas by-product of the synthesis of methanesulphonic acid, wherein methanesulphonic chloride entrained by the HCl gas is removed, comprising:
- a) injecting an amount of water ranging from 0.01 to 20%, relative to the mass of HCl to be treated, into a flow of the HCl gas;
- b) lowering the temperature of the flow of the HCl gas to a value from −5° C. to 15° C. to form a purified HCl gas and condensates containing the methanesulfonyl chloride;
- and
- c) separating the purified HCl gas from the condensates.
Process for purification of HCl gas by-product of the synthesis of methanesulphonic acid, wherein methanesulphonyl chloride entrained in the HCl gas is removed, comprising:
- a) injecting an amount of water ranging from 5%-10%, relative to the mass of HCl to be treated, into a flow of the HCl gas;
- b) lowering the temperature of the flow of the HCl gas to a value from −5° C. to 5° C. to form a purified HCl gas and condensates containing the methanesulfonyl chloride;
- and
- c) separating the purified HCl gas from the condensates.
Process for producing a hydrochloric acid solution from a HCl gas by-product of the synthesis of methanesulphonic acid, wherein methanesulphonyl chloride entrained in the HCl gas is removed, comprising:
- a) injecting an amount of water ranging from 0.01 to 20%, relative to the mass of HCl to be treated, into a flow of the HCl gas;
- b) lowering the temperature of the flow of the HCl gas to a value from −5° C. to 15° C. to form a purified HCl gas and condensates containing the methanesulfonyl chloride;
- c) separating the purified HCl gas from the condensates. d) combining the purified HCl gas with water to form a solution of HCl in water.
Dependencies are inferred from the claim text.