Continuous autorefrigerative dewaxing process and apparatus
Patent
·
OSTI ID:6864636
A continuous autorefrigerant solvent dewaxing process is disclosed wherein a waxy oil is prediluted with a nonautorefrigerative solvent, such as ketone, preferably a mixture of mek/mibk, and then passed, at a temperature above its cloud point, to the top of a chilling zone, which is an autorefrigerant chilling zone operating on a continuous basis, and comprises a vertical, multi-staged tower, operating at constant pressure. In this chilling zone, wax is precipitated from the oil to form a waxy slurry and the so-formed slurry is further chilled down to the wax filtration temperature by stagewise contact with liquid autorefrigerant preferably propylene, which is injected into a plurality of said stages and evaporated therein so as to cool the waxy slurry at an average rate of between about 0.1* to 20* F. Per minute with an average temperature drop across each stage of between about 2* and 20* F. Some of the propylene remains in the oil which serves to further dilute and reduce the viscosity of the slurry. The dewaxed oil-containing slurry may then be fed directly to wax filters without having to pass through scrapedsurface chillers and filter feed drum.
- Assignee:
- Exxon Research And Engineering Co
- Patent Number(s):
- US 4217203
- OSTI ID:
- 6864636
- Country of Publication:
- United States
- Language:
- English
Similar Records
Continuous autorefrigerative dewaxing apparatus
Dewaxing process
Dewaxing process using agitated heat exchanger to chill solvent-oil and wax slurry to wax filtration temperature
Patent
·
Mon Mar 15 23:00:00 EST 1982
·
OSTI ID:5212494
Dewaxing process
Patent
·
Tue May 08 00:00:00 EDT 1984
·
OSTI ID:6514929
Dewaxing process using agitated heat exchanger to chill solvent-oil and wax slurry to wax filtration temperature
Patent
·
Mon Apr 09 23:00:00 EST 1984
·
OSTI ID:6637000