关键词: 甜水, 杂质, 净化

Abstract: Sweet water is the primary product of glycerol produced from oil and fat hydrolysis. The purification operation of sweet water is one of the key steps in glycerin refining. A new method of coagulation/flocculation for purification of sweet water was proposed, and the effects of various operation factors was investigated. The results showed that the best operation conditions were pH value of 11.4, time of 60min, and stirring speed over 300r/min during pH adjustment phase and coagulant dosage of 75mg/L, flocculent dosage of 20mg/L, stirring speed of 100r/min and flocculation time of 30min during flocculation phase. Compared with the traditional process, the new purification method can achieve lower saponification equivalent and turbidity of the supernant from the treated sweet water. The flocs sediment could be separated easily and recycled thoroughly. Therefore, this purification method is much valuable for practical impurities removal from sweet water.

Key words: sweet water, impurity, purification