| 摘要 |
In the separation of wax crystals from dewaxed oil and solvent using a rotary drum vacuum filter having a filter cloth around its periphery embedded wax and/or resin is removed from the filter cloth on the drum by backwashing the filter cloth with cold solvent at not more than 30 DEG F above the filtration temperature introduced at 12-100 psig from within the drum over an area defined by an arc of the filter drum of 12 DEG - 72 DEG . Cake on the primary filter 3 is treated with an inward flow of inert gas over segment 14, washed with a spray 16 of cold solvent, treated with a second inward flow of inert gas over segment 20 and then backwashed with cold solvent or repulp filtrate 22 over segment 23. A backwashing process can also be applied to the repulp filter 26. <IMAGE> |
