초록 ▼

A warm-up deoiling process for lube oil slack wax wherein cold slack wax from a solvent dewaxing operation is warmed up and mixed with solvent to dissolve foots oil contained therein and passed to a rotary drum filter to recover solid wax and a filtrate comprising a solution of foots oil and solvent

A warm-up deoiling process for lube oil slack wax wherein cold slack wax from a solvent dewaxing operation is warmed up and mixed with solvent to dissolve foots oil contained therein and passed to a rotary drum filter to recover solid wax and a filtrate comprising a solution of foots oil and solvent wherein said filtrate is contacted with one side of a semi-permeable membrane made from regenerated cellulose which selectivity permeates at least a portion of solvent through said membrane and recycling the permeated solvent directly back into the warm-up deoiling operation as part of the solvent mixed with the slack wax.

대표청구항 ▼

A process comprising: (a) warming up a mixture of foots oil containing slack wax and solvent to dissolve at least a portion of the foots oil to form a slurry comprising solid particles of wax and a solution of foots oil and solvent; (b) passing said warm slurry to solid-liquid separation means to se

A process comprising: (a) warming up a mixture of foots oil containing slack wax and solvent to dissolve at least a portion of the foots oil to form a slurry comprising solid particles of wax and a solution of foots oil and solvent; (b) passing said warm slurry to solid-liquid separation means to separate the solid particles of wax from the foots oil solution; and (c) contacting at least a portion of said foots oil solution, under pressure, with one side of at least one semi-permeable membrane made from regenerated cellulose film to form a permeate richer in said solvent than said mixture and a retentate leaner in said solvent than said solvent than said mixture, wherein said semipermeable membrane is prepared from a water-containing hydrophilic regenerated cellulose membrane by sequentially permeating through said water-containing membrane, under a differential pressure across the membrane, a series of solvents of decreasing polarity wherein adjacent solvents in the series exhibit bulk liquid-liquid miscibility with each other and wherein the last solvent exhibits bulk liquid-liquid miscibility with the dewaxing solvent to be permeated through the membrane.