Solvent dewaxing and deoiling process
Abstract
Abstract THIS INVENTION RELATES TO A METHOD OF SEPARTING WAS FROM A WAX BEARING MINERAL OIL EMPLOYING A MIXTURE OF AN AROMATIC HYDROCARBON AND A KETONE AS A DEWAXING SOLVENT AND CHILLING OF THE OIL-SOLVENT MIXTURE BY DIRECT HEAT EXCHANGE WITH A LIQUID REFRIGERANT. COOLING TO DEWAXING TEMPERATURE IS EFFECTED BY ADMIXING LIQUID REFIGERANT WITH THE OIL-SOLVENT MIXTURE AT AN ELEVATED PRESSURE AND REDUCING THE PRESSURE EFFECTING EVAPORATION OF REFRIGERANT AND CONCOMITANT COOLING. WAX CRYSTALS FORMED AT THE DEWAXING TEMPERATURE ARE SEPARATED FROM OIL-SOVENT MIXTURE AND REPULPED WITH ADDITIONAL FSOLVENT AND DEWAXED OIL PRODUCT IS SEPARTED FROM THE OIL-SOLVENT MIXTURE. REPULPED WAX IS SEPARATED FROM THE REPULPING SOLVENT MIXTURE FORMING WAX OF LOW OIL CONTENT. REPULPING SOLVENT CONTAINING OIL WASHED FROM THE WAX CRYSTALS IS RECYCLED TO THE INITAL DEWAXING STEP TO ACHIEVE HIGH YIELDS OF DEWAXED OIL.
Inventors
- 👤 Paul P Bozeman Jr
- 👤 Herbert C Morris
- 👤 Robert A Woodle
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |