【摘要】 研究了高酸值(酸值(KOH)27 mg/g)米糠油制备生物柴油的工艺参数,通过单因素试验和正交试验得出,预酯化的最优工艺条件为:甲醇用量30%(占原料质量)、硫酸催化剂用量3%、反应温度70℃、反应时间2.5 h。酯交换的最优工艺条件为:甲醇用量30%、氢氧化钠催化剂用量1.5%、反应温度70℃、反应时间2.0 h。在此最优条件下测得转化率为96%。一级薄膜蒸发工艺参数为:真空度0.097 MPa,温度100℃,转子转速300 r/min,物料流量300 g/h;一级刮膜式分子蒸馏工艺参数:进口温度170℃,出口温度150℃,真空度20 Pa,物料流量295.70 g/h。更多还原

【Abstract】 The high acid value(acid value(KOH)27 mg/g) rice bran oil was used as material to prepare biodiesel by two-step method.Through single factor experiment and orthogonal test,the optimum reaction conditions of esterification were determined as follows: methanol dosage 30%(based on the weight of stuff),catalyst(sulfuric acid)dosage 3%,reaction temperature 70 ℃,reaction time 2.5 h.The optimum reaction conditions of transesterification were as follows: methanol dosage 30%,catalyst(sodium hydroxide) dosage 1.5%,reaction temperature 70℃,reaction time 2.0 h.The conversion rate under the optimum reaction conditions was 96%.The parameters of first-level film evaporation were: 0.097 MPa,temperature 100℃,feed rate 300 g/h;and the parameters of first-level scraped film type molecular distillation were as follows:inlet temperature 170℃,outlet temperature 150℃,vacuum 20 Pa,feed rate 295.70 g/h.更多还原