Abstract: Variations in the air outlet temperature of a vortex cooler which varies with the inlet temperature and pressure are maintained within precise limits by a thermocouple electrically connected to a feedback loop which controls the vortex inlet air pressure in response to the signal from the thermocouple. A pneumatic inlet air control valve, along with a microprocessor based transmitter/controller and an I/P Converter pneumatically connected to the vortex inlet air control valve comprise the feedback loop. This maintains the cold air outlet temperature of the cooler within one degree of the desired temperature, despite fluctuations in the inlet air pressure and temperature.

Abstract: A method is disclosed for the in-situ repair of damaged filter cloths in solvent dewaxing filters. The damage that can be repaired can be either or both of tears or holes. The method comprises thoroughly washing the filter cloth in the area of the damage to remove wax and oil, applying a quantity of solvent resistant adhesive to the damaged area such that the area of treatment extends beyond the hole or tear and adhesive overlays onto undamaged cloth, inserting pre-cut portions of filter cloth into the damage so as to completely fill the hole or tear but not create a bulge or cloth buildup in the face of the filter cloth where required and, finally, and optimally applying a final coating of adhesive over the repaired area.

Abstract: A process in fuels production for increasing the yield of deasphalted oil production from upgraded residua and improving deasphalter operability involving mixing the upgraded residua with an aromatics solubilizing aid to prevent the formation of an immiscible third phase during deasphalting.

Abstract: A process for increasing the production of Bright Stock oil in a lube oil process scheme. Aromatic extract oil, after being separated from the extraction solvent, is recycled back to the deasphalter unit and combined with a vacuum residuum in 10-20 LV %, based on the total deasphalter feed, prior to deasphalting. After deasphalting and aromatics extraction the absolute yield of raffinate is increased.