Dewaxing of lubricating oil

Claim 1

A PROCESS FOR PRODUCING LOW POUR POINT LUBRICATING OIL STOCKS FROM HIGH POUR POINT WAXY LUBRICATING OIL STOCK COMPRISING MIXING THE WAXY OIL STOCK WITH LIQUEFIED PROPANE, CHILLING THE MIXTURE TO A DEWAXING TEMPERATURE AND THEREBY CRYSTALLIZING WAX, ADMIXING WITH THIS OIL-PROPANEWAX MIXTURE A QUANTITY OF UREA-N-PARAFFIN WAX COMPLEX AS SUBSEQUENTLY PRODUCED, SEPARATING THE ADMIXED COMPLEX AND CRYSTALLIZED WAX FROM RESIDUAL OIL-PROPANE SOLUTION STILL CONTAINING SOME WAX IN SOLUTION, WARMING THIS LATTER SOLUTION TO A TEMPERATURE BETWEEN ABOUT 0* AND 100* F. AND ABOVE SAID DEWAXING TEMPERATURE, MIXINGING WITH THIS WARMED SOLUTION AN ADMIXTURE OF SOLID UREA WET WITH AN ACTIVATING AGENT COMPRISING A LOW MOLECULAR WEIGHT OXYGEN CONTAINING ALIPHATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALCOHOLS, KETONES, AND ETHERS, REMOVING FROM THIS LATTER ADMIXTURE A UREA-N-PARAFFIN WAX COMPLEX THEREBY LEAVING A DEWAXED OIL SOLUTION CONTAINING PROPANE, RECOVERING THE OIL FROM THIS DEWAXED OIL SOLUTION CONTAINING PROPANE AS THE DEWAXED OIL PRODUCT OF THE PROCESS AND RETURNING THE REMOVED UREA-N-PARAFFIN WAX COMPLEX TO THE FIRST ADMIXING STEP AS SAID UREA-NPARAFFIN WAX COMPLEX AS SUBSEQUENTLY PRODUCED.