Process for producing sulfonic acid
AssigneeArkema France
InventorsJean-Alex Laffitte, Bernard Monguillon
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Abstract
The subject of the present invention is a process for producing a sulfonic acid which is sparingly corrosive, or even non-corrosive, with respect to stainless steels, said process comprising at least the steps of adding at least one nitrite to a sulfonic acid, curing, with stirring, with sparging of the mixture and recovering the low-corrosion sulfonic acid obtained. The invention also relates to the low-corrosion sulfonic acid obtained according to the process of the invention, and also to the use thereof as low-corrosion sulfonic acid.
Claims24
Process for producing a low-corrosion sulfonic acid, comprising at least the following steps:
- a) adding at least one nitrite to a conventional sulfonic acid;
- b) curing the mixture with stirring at a temperature between 0° C. and 100° C., for a period of between 1 min and 5 h;
- c) sparging the mixture with air and/or inert gas;
- and
- d) recovering, in an initial recovery step, the low-corrosion sulfonic acid.
Process for producing a low-corrosion sulfonic acid, comprising at least the following steps:
- a) adding at least one nitrite to a conventional sulfonic acid;
- b) curing the mixture with stirring at a temperature between 0° C. and 100° C., for a period of between 1 min and 5 h;
- c) recovering the low-corrosion sulfonic acid, and
- wherein the mixture obtained after the curing of step b), or else during the curing of step b), or else during and after the curing of step b), is subjected to a step of bubbling air and/or inert gas.
Dependencies are inferred from the claim text.