High purity benzene production using extractive distillation
AssigneeChevron Research and Technology Company
InventorsGeorge T. Chen, Brenda M. Balaban, Gerd Emmrich, Bernhard Firnhaber
Life of this patent
Estimating the term…
Abstract
A process is provided for separating benzene from non-aromatics in a highly aromatic stream containing olefins in a concentration range of from about 0.05 to about 5.0, which process comprises predistilling said highly aromatic stream to produce a distilled fraction having a concentration of C.sub.8 and heavier compounds of less than about 0.1 wt percent; and extracting said distilled fraction with a solvent comprising substituted morpholines in an extractive distillation zone to produce a highly-pure benzene stream.
Claims7
A process for separating benzene from non-aromatics in a highly aromatic stream containing between about 0.5 and about 5.0 weight percent olefins, comprising:
- (a) predistilling said highly aromatic stream to produce a distilled fraction having a concentration of C.sub.8 and heavier compounds of less than about 0.05 weight percent;
- (b) extracting said distilled feedstream with a solvent comprising N-substituted morpholines in an extractive distillation zone, to produce a highly-pure benzene stream.
A process for producing a highly pure benzene, comprising:
- (a) contacting a hydrocarbon feedstream having a sulfur concentration of less than about 100 parts per billion with a non-acidic L-type zeolite catalyst comprising platinum under reforming conditions to produce a highly aromatic stream and hydrogen, said highly aromatic stream comprising benzene, non-aromatics and between about 0.5 and about 5.0 weight percent olefins,
- (b) distilling said highly aromatic stream to produce a distilled feedstream having a concentration of C.sub.8 and heavier compounds of less than about 0.05 wt percent;
- (c) extracting said distilled feedstream with a solvent comprising N-substituted morpholines in an extractive distillation zone, and;
- (c) removing from said extractive distillation zone a highly-pure benzene stream.
Dependencies are inferred from the claim text.