Abstract: A method for removing sulfur containing contaminants from a thermally cracked waste oil is disclosed. In the present invention, the substantial amount of contaminants containing sulfur is separated into a solvent and further remaining contaminants can be separated via adsorption with bauxite such that an end product oil having better quality may be produced with higher productivity. The solvent can be subject to flash evaporation and then be recycled.

Abstract: A method for removing sulfur containing contaminants from a thermally cracked waste oil is disclosed. In the present invention, the substantial amount of contaminants containing sulfur is separated into a solvent and further remaining contaminants can be separated via adsorption with bauxite such that an end product oil having better quality may be produced with higher productivity. The solvent can be subject to flash evaporation and then be recycled.

Abstract: An apparatus and a process for reclaiming fuel oils from waste oils. The apparatus and process is characterized in that waste oils are thermally cracked by combination of high pressure and vacuum in a sequence at high temperature. However, rapid thermal cracking is performed at even lower temperature of 300˜350° C. than at 400˜450° C. of conventional batch method. The semi-continuous method with bleeding process is employed and accordingly no pause stage becomes necessary to physically collect ash cake from the thermal cracking vessel as experienced from the conventional batch process. The ash cake contents drops from 5% of conventional method to 1.4% since slow reaction is a cause for oxidation problem which is related with formation of tar compounds and production rate of #2 diesel fuel oil increases 3 times more than batch process.

Abstract: Disclosed is an autothermal aerobic digestion system having closed defoaming system. The system according to the present invention completely controls light and heavy foam by using a series of aeration venturi and defoamer venturi and a foam collector pipe. According to this invention, an internal pressure of a digester is elevated by using inversely troublesome foam, so pathogenic microorganisms is destroyed. In addition to, by using simple venturi, an air inlet, defoaming and a recycling of a warm air can be achieved.

Abstract: An apparatus and a process for reclaiming fuel oils from waste oils. The apparatus and process is characterized in that waste oils are thermally cracked by combination of high pressure and vacuum in a sequence at high temperature. However, rapid thermal cracking is performed at even lower temperature of 300˜350° C. than at 400˜450° C. of conventional batch method. The semi-continuous method with bleeding process is employed and accordingly no pause stage becomes necessary to physically collect ash cake from the thermal cracking vessel as experienced from the conventional batch process. The ash cake contents drops from 5% of conventional method to 1.4% since slow reaction is a cause for oxidation problem which is related with formation of tar compounds and production rate of #2 diesel fuel oil increases 3 times more than batch process.

Abstract: A method for removing contaminants from thermally cracked waste oil is disclosed. The thermally cracked oil is mixed with methanol at an elevated temperature and pressure to accelerate the whole extraction process and to obtain better productivity and better quality of end product oil. The contaminants in methanol liquid phase are separated by flash evaporation and the resulting methanol solvent is recycled.

Abstract: Disclosed is an autothermal aerobic digestion system having closed defoaming system. The system according to the present invention completely controls light and heavy foam by using a series of aeration venturi and defoamer venturi and a foam collector pipe. According to this invention, an internal pressure of a digester is elevated by using inversely troublesome foam, so pathogenic microorganisms is destroyed. In addition to, by using simple venturi, an air inlet, defoaming and a recycling of a warm air can be achieved.