以经过2次液-液萃取脱酸的乌桕脂为目标油脂,研究了D202型大孔阴离子交换树脂脱酸工艺的可行性。采用中心组合旋转响应面设计(CCRD)对树脂脱酸工艺中的物料比、反应时间、树脂用量3个工艺参数进行优化,得到阴离子交换树脂脱酸的适宜工艺条件是:改性脂质与正己烷的物料比为1∶4.91,反应时间控制在7.28 h,树脂用量为9.23 g。在此条件下脱酸后,改性脂质的酸价可降低至0.11 mgKOH/g。3个因素对树脂脱酸效果的影响次序为,树脂用量>反应时间>物料比。

Deacidification of modified Chinese tallow oil has been investigated using a strategy consisted of twice liquid-liquid extraction and deacidification process of D202 polymeric anion ion exchange.The effects of material ratio,reaction time and dosage of resin were investigated by central composite response design(CCRD) to obtain the optimum process.The optimum parameters were material ratio1:4.91,reaction time 7.28h,dosage of resin 9.23g.Under these optimum process parameters,acid value of modified lipid reduced to 0.11 mgKOH/g after deacidification of D202 resin.The sequences of three factors influenced on the deacidification of modified lipid were dosage of resin>extraction time>material ratio.