Continuous autorefrigerative dewaxing apparatus
Patent
·
OSTI ID:5212494
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 stage-wise contact with liquid auto-refrigerating 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/sup degrees/ F per minute with an average temperature drop across each stage of between about 2 and 20/sup degrees/ 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 scraped surface chillers and filter feed drum.
- Assignee:
- Exxon Research and Engineering Co
- Patent Number(s):
- US 4319962
- OSTI ID:
- 5212494
- Country of Publication:
- United States
- Language:
- English
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