Method of reducing the benzene content of gasolines

Details Method of reducing the benzene content of gasolines Method of reducing the benzene content of gasolines

1990-08-21

1993-02-09

McFarlene, Anthony

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By condensation of entire molecules or entire hydrocarbyl...

585450, 585467, 585805, 585807, 208 62, 208 92, 208 93, 208 95, 208 96, C07L 264, C07L 704, C07L 7148

Patent

active

051854864

ABSTRACT:
The benzene content of hydrocarbon gasolines is accomplished by (a) fractionating at least one hydrocarbon gasoline into a light fraction A, with an increased benzene content, and a heavy fraction B, with a reduced benzene content; (b) contacting the light fraction A at a temperature below room temperature with a gas containing at least a fraction of olefins in which the number of carbon atoms is from 2 to 5 per molecule so that at least a fraction of said olefins is absorbed in light fraction A; at the end of stage (b), separating a residual gas with a reduced olefin content from a liquid fraction C, with an increased olefin content; (d) passing the fraction C from stage (c) into an alkylation reactor so that at least a fraction of the benzene is alkylated by at least a fraction of the olefins; (e) fractionating the mixture emerging from stage (d) so as to produce, firstly, a gas phase chiefly comprising gases which were not converted during stage (d) and, secondly, a liquid phase, at least partly containing the non-alkylated benzene and alkylbenzenes; and (f) mixing the liquid phase from stage (e) with the heavy fraction B from stage (a).

REFERENCES:
patent: 2396966 (1946-03-01), Passino
patent: 2955143 (1960-10-01), Bloch
patent: 4140622 (1979-02-01), Herout
patent: 4209383 (1980-06-01), Herout et al.
patent: 5120890 (1992-06-01), Sachtler et al.

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