Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By addition of extraneous agent – e.g. – solvent – etc.
Patent
1987-07-10
1989-06-27
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
048431842
ABSTRACT:
Mixtures of C.sub.12 -C.sub.18 n-paraffins with paraffinsulfonic acids having the same number of carbon atoms, water and sulfuric acid, and obtained by sulfoxidation of said paraffins with sulfur dioxide and oxygen in the presence of water and ultraviolet radiation are stripped of their excess sulfur dioxide and decanted to separate most of the paraffins, and obtain a residual mixture.
The residual mixture is fed with sulfuric acid until a two-phase system forms or at least until the mixture becomes turbid, and the turbid mixture or that floating on the heavy water-sulfuric acid phase is extracted with supercritical carbon dioxide, which removes with it the paraffins, which can be reused in the sulfoxidation process.
REFERENCES:
patent: 2875257 (1959-02-01), Thompson
patent: 3033898 (1962-05-01), Bray
patent: 3861442 (1972-08-01), Bloch et al.
patent: 4269789 (1981-05-01), Zornes
patent: 4361520 (1982-11-01), Luetzelschwab
Patrick et al., "Supercritical Extraction (SCE) of Dixylenol Sulfone (DXS)", Process Technology Processing, 1985, vol. 3, pp. 379-384.
Castellano Maurizio
Faggian Lucio
Franco Cosimo
Platone Edoardo
Caldarola Glenn
Enichem Augusta S.p.A.
Eniricerche S.p.A.
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