Aromatic hydrocarbon separation via solvent extraction

Details Aromatic hydrocarbon separation via solvent extraction Aromatic hydrocarbon separation via solvent extraction

1976-04-22

1977-09-06

Levine, Herbert

Mineral oils: processes and products

Fractionation

Liquid extraction with solvents

260674SE, C10G 2128

Patent

active

040466760

ABSTRACT:
A solvent extraction process for separating polar hydrocarbons from non-polar hydrocarbons. The solvent-rich extract phase from the extraction zone is introduced into a stripping column. The stripper bottoms, being a polar hydrocarbon-containing, solvent-rich stream, is introduced into an upper portion of a solvent recovery column. A first vaporous stripping medium is introduced into a lower portion of the solvent recovery column. A first solvent-rich stream, virtually free from hydrocarbons, is withdrawn as a bottoms product and recycled to the extraction zone, while a hydrocarbon-containing, side-cut second solvent-rich phase is withdrawn and introduced into the stripping column in admixture with the extract phase. At least a portion of one of the first and second solvent-rich streams is commingled with the fresh feed for introduction therewith into said extraction zone. A relatively minor proportion of the first solvent-rich stream is introduced into a solvent regenerating zone, therein contacting a second vaporous stripping medium. Regenerated solvent, containing substantially all of the second stripping medium is introduced into said recovery column as at least a portion of said first stripping medium.

REFERENCES:
patent: 3466345 (1969-09-01), DeGraff et al.
patent: 3466346 (1969-09-01), DeGraff et al.

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