Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By addition of extraneous agent – e.g. – solvent – etc.
Patent
1987-07-10
1989-05-02
Caldarola, Glenn
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By addition of extraneous agent, e.g., solvent, etc.
585833, 208 24, 260505P, C07C14324
Patent
active
048270784
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.
REFERENCES:
patent: 2228598 (1941-01-01), Fox
patent: 2875257 (1959-02-01), Thompson
patent: 3033898 (1962-05-01), Bray
patent: 3681442 (1972-08-01), Bloch et al.
patent: 4269789 (1981-05-01), Zornes
patent: 4361520 (1882-11-01), Luetzelschwab
Carrillo Gerardo
Faggian Lucio
Franco Cosimo
Caldarola Glenn
Enichem Augusta, S.P.A.
Eniricherche, S.P.A.
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