| PATENT ASSIGNEE'S COUNTRY | USA |
| UPDATE | 12.99 |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT CLAIMS |
Purification method - Placing used oil into continuous flow apparatus - Contacting used oil with base introduced at such rate such to maintain base (1-10%) - Contacting used oil with phase transfer catalyst introduced at such rate such that concn (1-10%) - Heat. to 200-275C - Mixing compn - Separating the catalyst from mixt using first distn at 200-275C & pressure 100-200 torr - Fractionating used oil using second distn at 275-300C & pressure 0.05-0.2 torr |
| PATENT PHOTOCOPY | Available on request |
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