Liquid salt extraction of aromatics from process feed streams

Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By addition of extraneous agent – e.g. – solvent – etc.

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585833, 585860, 585863, 585864, C07C 717

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active

043595960

ABSTRACT:
Liquid salts such as quaternary phosphonium and ammonium salts of halides, acids, or more complex anions can be utilized to extract aromatics from mixed aliphatic/aromatic hydrocarbon feeds such as isomerization process feed streams, cat naphthas, lube stocks, and the like. Such salts show the required solubilities in various solvents to exhibit a distinct selectivity advantage over more commonly used extraction solvents such as sulfolane in the extraction of benzene and other aromatics from heptane and other aliphatic feedstreams.

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PCT International Publication WO 80/01692 (published Aug. 21, 1980).
PCT International Publication WO 80/01690 (published Aug. 21, 1980).
PCT International Publication WO 80/01689 (published Aug. 21, 1980).
Tetrahedron Letters, vol. 21, pp. 3037-3038.

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