Separation of aromatic hydrocarbons from a mixture of aromatic a

Details Separation of aromatic hydrocarbons from a mixture of aromatic a Separation of aromatic hydrocarbons from a mixture of aromatic a

1993-12-22

1996-10-08

Gibson, Sharon

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By addition of extraneous agent, e.g., solvent, etc.

585864, 585866, C07C 710, C07C 700

Patent

active

055633153

ABSTRACT:
The invention relates to a process for separating aromatic hydrocarbons from a mixed hydrocarbon feed employing a selective solvent which exhibits a low critical solution temperature of the solvent with a solute. The mixed hydrocarbon feed is passed to an extraction zone wherein the feed is contacted with a lean solvent to provide a raffinate stream comprising non-aromatics and a rich solvent stream comprising aromatics and solvent. Both the raffinate stream and the rich solvent stream are admixed with a sufficient amount of a solute at a temperature which is at or below a low critical solution temperature with the solvent to separate the raffinate and aromatic phases from the solvent/solute mixture. The solvent/solute mixture is heated to a separation temperature which is above the low critical solution temperature to provide a solvent phase which is essentially free of solute at energy levels significantly lower than conventional processes.

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Hydrocarbon Processing, vol. 71, No. 11, Nov. 1992, p. 195.
Hydrocarbon Processing, vol. 67, No. 9, Sep. 1988, p. 89.

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