Process for preparing an alkanesulphonic acid
AssigneeEvonik Degussa GmbH
InventorsBenjamin Fonfe, Nadine Duerr, Harald Jakob, Chiu Kee Cheung, Andreas Doerflein, Sebastian Fuss
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Abstract
The present invention relates to a process for preparing alkanesulphonic acid by oxidizing an alkyl mercaptan, a dialkyl disulphide and/or a dialkyl polysulphide having three to nine sulphur atoms with an oxidizing agent, wherein additional oxidizing agent is fed into the oxidation if as yet unoxidized alkyl mercaptan and/or unoxidized dialkyl disulphide and/or at least one intermediate from the oxidation of the dialkyl disulphide and/or of the dialkyl polysulphide is present in the reaction output, and a corresponding apparatus for performance of oxidation reactions.
Claims17
A process for preparing an alkanesulphonic acid, the process comprising:
- a) oxidizing at least one sulphur-containing starting compound with an oxidizing agent, thereby producing a corresponding alkanesulphonic acid, wherein the at least one sulphur-containing starting compound is selected from the group consisting of alkyl mercaptan, dialkyl disulphide and dialkyl polysulphide having three to nine sulphur atoms,
- b) determining the at least one sulphur-containing starting compound and/or at least one oxidation intermediate from the oxidizing the at least one sulphur-containing starting compound to the corresponding alkanesulphonic acid in a reaction output from the oxidizing, wherein the at least one oxidation intermediate is determined to be an S-alkyl alkanesulfonate and is determined with UV-vis spectroscopy, and the at least one sulphur-containing starting compound is determined to be a dialkyl disulphide and/or a dialkyl polysulphide and is determined by pulsed amperometric detection, and
- c) supplying an additional oxidizing agent in the oxidizing to complete a oxidation reaction after the determining.
A method for preparing at least one alkanesulphonic acid, the method comprising:
- preparing the at least one alkanesulphonic acid with UV-vis spectroscopy and/or pulsed amperometric detection.
An apparatus for conducting at least one oxidation reaction, the apparatus comprising:
- i) a reactor for oxidizing at least one starting compound,
- ii) a measuring unit, downstream of the reactor, for determining at least one nonoxidized starting compound and/or at least one oxidation intermediate from the oxidation reaction of the at least one starting compound to a desired target compound in a reaction output from the oxidization reaction, wherein the measuring unit is a UV-Vis spectrometer and/or an amperometric detector, and
- iii) a unit, in contact with the measuring unit, for supplying additional oxidizing agent to the reactor.
Dependencies are inferred from the claim text.