杂化膜催化酯化与固体碱酯交换集成工艺制备生物柴油

摘要

以废鸡油为原料,建立杂化膜催化酯化-固体碱催化酯交换集成工艺制备生物柴油.考察醇油质量比、反应温度等对酯化反应的影响.采用气相色谱分析产物中脂肪酸组成;核磁共振氢谱计算鸡油中甘油三酯酯交换反应的转化率.结果表明,最佳工艺条件为:反应温度338 K,甲醇与废鸡油质量比为3:1,鸡油酯化反应转化率为93.5％.气相色谱显示,废鸡油原料中含有的五种脂肪酸都转化成为脂肪酸甲酯,鸡油酯交换反应转化率为98.1％.制备出的生物柴油样品酸值、密度、运动黏度、闪点和硫含量多项指标均满足我国GBT 20828—2015、美国ASTM 6751—06e1和欧洲EN 14214生物柴油标准.%An integrated process of esterification by hybrid membrane and transesterification by sodium methoxide was carried out to produce biodiesel from waste chicken oil and methanol. Influence of some crucial variables on the conversion was systematically investigated,such as mass ratio of oil to methanol and reaction temperature. The composition of transesterification product was obtained by Gas Chromatogra-phy (GC). The conversion of transesterification was calculated by 1 H NMR. The result showed that the esterification conversion was 93. 5％ under the optimum conditions of the methanol/ chicken oil mass ratio 3: 1,reaction temperature 338 K. The GC showed five fatty acids in chicken oil were converted five esters. The esterification conversion was 98. 1％ . Biodiesel sample obtained showed light yellow. The properties of the product met well the standard of GBT 20828—2015,ASTM 6751—06e1 and EN 14214.