The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 02, 1989
Filed:
Jul. 10, 1987
Cosimo Franco, Locri, IT;
Gerardo Carrillo, San Donato Milanese, IT;
Lucio Faggian, San Donato Milanese, IT;
Eniricherche, S.P.A., Milan, IT;
Enichem Augusta, S.P.A., Palermo, IT;
Abstract
In preparing alkanesolfonic acids by sulfoxidation of n-paraffins containing between 12 and 18 carbon atoms, using ultraviolet radiation to initiate the reaction (light-water process), a mixture is obtained which spontaneously allows a substantial part of the unconverted n-paraffins to phase separate from a phase containing the remainder of the reaction mixture containing the alkanesulfonic acids together with water, sulfuric acid and n-paraffins. The remainder of the mixture is fed with one or more alcohols having four or less than four carbon atoms, preferably isopropanol, to form a two-phase mixture. The two-phase mixture is extracted with supercritical carbon dioxide, which extracts the n-paraffins, these being recycled to the sulfoxidation process. The paraffin-free product is suitable for preparing alkane-sulfonates of the desired type by neutralization with suitable bases.