Recovery and purification of substituted benzenesulfonates
AssigneeSiemens Axiva GmbH & Co. KG
InventorsRainald Forbert, Thomas Diehl
Life of this patent
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Abstract
A process for recovering and purifying substituted benzenesulfonates, by neutralizing a mixture including at least one substituted benzenesulfonate, or at least one corresponding substituted benzenesulfonic acid, and sulfur trioxide, sulfuric acid and/or hydrogen chloride in free or bound form, in an aqueous phase using an alkali metal hydroxide, and purifying it in this aqueous phase, and by subsequently separating the substituted benzenesulfonate(s) from this aqueous phase. The mixture is comminuted into particles having a Sauter mean diameter in the range from 1 μm to 2 cm, either before or during introduction into this aqueous phase.
Claims29
A process for recovering and purifying substituted benzenesulfonates comprising:
- (a) comminuting a mixture comprising at least
- (1) a substituted benzene sulfonate or a substituted benzenesulfonic acid;
- and
- (2) at least one compound selected from the group consisting of sulfur trioxide, sulfuric acid and hydrogen chloride, any of which occurring in either free or bound form, into particles having a Sauter mean diameter in the range from 1 μm to 2 cm;
- (b) neutralizing the mixture with an alkali metal hydroxide;
- and
- (c) separating the substituted benzenesulfonates.
A process for recovering and purifying substituted benzenesulfonates comprising:
- (a) providing a means for comminuting a mixture comprising at least
- (1) a substituted benzene sulfonate or a substituted benzenesulfonic acid;
- and
- (2) at least one compound selected from the group consisting of sulfur trioxide, sulfuric acid and hydrogen chloride, any of which occurring in either free or bound form, into particles having a Sauter mean diameter in the range from 1 μm to 2 cm;
- (b) neutralizing the mixture with an alkali metal hydroxide;
- and
- (c) separating the substituted benzenesulfonates.
A process for recovering and purifying substituted benzenesulfonates comprising:
- (a) comminuting a mixture comprising at least
- (1) a substituted benzene sulfonate or a substituted benzenesulfonic acid;
- and
- (2) at least one compound selected from the group consisting of sulfur trioxide, sulfuric acid and hydrogen chloride, any of which occurring in either free or bound form, into particles having a Sauter mean diameter in the range from 1 μm to 2 cm;
- (b) subsequently neutralizing the comminuted mixture with an alkali metal hydroxide in an aqueous phase;
- (c) purifying the substituted benzene sulfonates;
- and
- (d) separating substituted benzenesulfonates from the aqueous phase.
Dependencies are inferred from the claim text.