Co-extraction of a hydrocarbon material and extract obtained by solvent extraction of a second hydrotreated material
AssigneeExxonMobil Research and Engineering Company
InventorsHeather A. Boucher Ashe, Ronald J. Taylor
Life of this patent
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Abstract
The present invention relates to a process to increase extraction yields and improve dewaxing performance of a lube boiling range stream. More particularly, the present invention is a process to produce at least one base oil by contacting a light lube stream with a polar solvent in a solvent extraction zone, then mixing the resulting extract with a second, heavier lube stream, extracting the mixture with a polar solvent, and dewaxing the resultant raffinate.
Claims23
A process to improve dewaxing performance and extraction yields of a lube boiling range stream comprising:
- a) contacting a light lube stream in a first solvent extraction zone with a first extraction solvent to produce at least a first aromatics-rich extract solution and a first aromatics-lean raffinate solution;
- b) removing at least a portion of said first extraction solvent from said first aromatics-rich extract solution to produce at least a first aromatics-rich extract;
- c) mixing at least a portion of said first aromatics-rich extract with a heavier lube stream to produce a mixed lube stream;
- d) contacting said mixed lube stream in a second solvent-extraction zone with a second extraction solvent to produce at least a second aromatics-rich extract solution and a second aromatics-lean raffinate solution;
- e) removing at least a portion of said second extraction solvent from said second aromatics-lean raffinate solution to produce at least a second aromatics-lean raffinate;
- and
- f) dewaxing said second aromatics-lean raffinate to produce at least one base oil.
A process to improve dewaxing performance and extraction yields of a lube boiling range stream comprising:
- a) contacting at least one light lube stream in a first solvent extraction zone with a first extraction solvent to produce at least a first aromatics-rich extract solution and a first aromatics-lean raffinate solution;
- b) removing at least a portion of said first extraction solvent from said first aromatics-rich extract solution to produce at least a first aromatics-rich extract;
- c) contacting at least one other light lube stream in a second solvent extraction zone with a second extraction solvent to produce at least a second aromatics-rich extract solution and at least a second aromatics-lean raffinate solution;
- d) removing at least a portion of said second extraction solvent from said second aromatics-rich extract solution to produce at least a second aromatics-rich extract;
- e) mixing at least a portion of said first aromatics-rich extract and at least a portion of said second aromatics-rich extract with a heavier lube stream to produce a mixed lube stream;
- f) contacting said mixed lube stream in a solvent-extraction zone with a third extraction solvent to produce at least a third aromatics-rich extract solution and at least a third aromatics-lean raffinate solution;
- g) removing at least a portion of said third extraction solvent from said third aromatics-lean raffinate solution to produce at least a first aromatics-lean raffinate;
- h) dewaxing said third aromatics-lean raffinate to produce at least one base oil.
Dependencies are inferred from the claim text.