Basf Se Corporation

Grillo-werke Ag

Grillo Chemie Gmbh

Ingo Biertümpel

Timo Ott

Alan K Richards

Klaus Driemel

Klaus Bunthoff

Horst Kirsch

Oliver Gross

A compound of the formula (I)ALK&#x2014;SO&#x2014;O&#x2014;O&#x2014;SOOX,

Initiator for preparing alkanesulfonic acids from alkane and oleum

The present invention relates to an alkane-sulfonation process using alkane and sulfur trioxide, especially pure sulfur trioxide (100%) under solvent-free conditions in the presence of an initiator. It further relates to the use of a precursor which forms 'in-situ' an initiator for manufacturing of alkanesulfonic acids, especially methanesulfonic acids.

Solvent-free alkane sulfonation

A compound of the formula:CH&#x2014;SO&#x2014;O&#x2014;O&#x2014;SOOH.

A process for preparing alkanesulfonic acids from sulfur trioxide and an alkane, wherein sulfur trioxide, the alkane and dialkylsulfonoyi peroxide (DASP) react as components, characterized in that the following steps are performed: a) sulfur trioxide is charged in a high-pressure reactor in a condensed phase; b) a temperature of at least 25&#xb0; C. is set; c) the gaseous alkane is introduced to the high-pressure reactor until a pressure of at least 10 bar is reached; d) dialkylsulfonoyi peroxide (DASP) is added; and e) after a duration of at least 5 hours, the produced alkanesulfonic acid is withdrawn.

Process for preparing alkanesulfonic acids from sulfur trioxide and an alkane

The process for the brightening of continuously produced sodium hydrogensulfate obtained in the reaction of sodium chloride and concentrated sulfuric acid in molten sodium hydrogensulfate in a circulation reactor, wherein evolved hydrogen chloride and heating gases generated by an immersion burner are withdrawn at various sites and seed crystals are added for a faster conversion of initially formed metastable phases, is that from 0.01 to 0.05% by weight of aluminium oxide and/or from 0.5 to 1.5% by weight of magnesium oxide and/or magnesium sulfate and, optionally, additionally calcium sulfate are added as seed crystals.

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Duisburg, Germany

Ingo Biertümpel