Method for separation of phenols and bases from coal tar oils by

Details Method for separation of phenols and bases from coal tar oils by Method for separation of phenols and bases from coal tar oils by

1987-03-13

1989-05-02

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568749, C07C 3768, C07C 3770

Patent

active

048270504

ABSTRACT:
Coal tar oil is separated quantitatively into neutral oil, phenols and bases by a two stage extraction with overcritical gases. Carbon dioxide is employed as an overcritical extraction agent, and propane or butane are preferably added as entrainers. The neutral oil is obtained in the first stage. Tar bases can be employed as an additional entrainer for improving the selectivity. The bases are extracted in the second stage. The method is associated with the advantage that it saves energy and that no byproducts are generated.

REFERENCES:
patent: 2301270 (1942-11-01), Gerlicher
patent: 2321036 (1943-06-01), Luten, Jr.
patent: 2997477 (1961-08-01), Eisenlohr et al.
patent: 4345976 (1985-12-01), Siegfried et al.
patent: 4559133 (1982-08-01), Peter et al.

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