Reclamation of Waste Lubricating Oil Using Ceramic Micro/Ultrafiltration Composite Membrances

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J. Korean Ceram. Soc. > Volume 37(5); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(5): 403.

세라믹 정밀/한외여과 복합막을 이용한 폐윤활유 정제

김계태, 현상훈

연세대학교 세라믹공학과

Reclamation of Waste Lubricating Oil Using Ceramic Micro/Ultrafiltration Composite Membrances

ABSTRACT

The permeation characteristics and reclamation efficiency of waste lubricating oil were studied as a function of the types of ceramic composite membranes and the membrane separation process variables. The oil permeability of the TiO2 composite membrane(pore size 0.015 $mutextrm{m}$) was directly proportional to the crossflow velocity(0.22∼0.9 m/s) and temperature(150$^{circ}C$∼200$^{circ}C$). In the batch concentration process, as the concentration factor increased, both the permeability and the ash content of the permeate decreased. The average ash contents of the total permeate through the A6 alumina membrane(average pore size 0.8$mutextrm{m}$), Z1/A6 and Z1/A4(pore size 0.23$mutextrm{m}$)/A7(pore size 6$mutextrm{m}$) zirconia composite membrances(average pore size 0.07$mutextrm{m}$) were about 0.063 wt%, 0.045wt% and 0.08wt% in the region of 1∼2 concentration factor, respectively. The ash content of the mixed permeate through the A6 alumina and zirconia composite membrane was about 0.06 wt% and it can be also reduced to 0.06 wt% in the Z1/A6 membrane and below 0.003 wt% in the TiO2/Z1/A6 membrane. It was concluded that the treated oil obtained from the multi-step membrane separation process could be used as reclaimed lubricating oil as well as reclained fuel oil.

Key words: Ceramic composite membrane, Crossflow, Reclamation, Waste lubricating oil, Fuel oil