... 3.higher recycled oil quality 4.Vacuum distillation equipment for used oil This DIR-VIII vacuum distillation machine was ... catalyst, through catalyzing, the harmful substances are selectively processed, for example, polymerization, shielding, passivation effect and discharged as residues, ... vacuum pump set;6,Oil storage system:Receiving tanks for all distilled fractions;7,Control system:Instruments and ...