制备生物航煤山苍子果核油预处理工艺

Pre-treatment of litsea cubeba nucleolus oil for bio-based aviation fuels

山苍子果核油主要成分为月桂酸等,碳原子数主要分布于8~16,目前仅用于制备烷醇酰胺等低端产品,却是生物航煤的优良原料之一.通过双氧水脱色、复合吸附脱色及酶法脱胶等对山苍子果核油原料油进行预处理及参数最优化设计,脱色率可以达到97.33%,磷脂含量由1.036 mg/g降低为0.036 mg/g.并确定双氧水脱色的最优实验参数为双氧水加入量15%,反应时间80min,反应温度110℃;活性炭/改性活性白土复合吸附最优实验参数为活性炭用量W1与改性活性白土用量W2重量比W1/W2=1/15,反应时间40 min,反应温度80℃,吸附剂加入量4%;酶法脱胶最优实验参数为加酶量40 mg/kg,pH5.1,反应时间2.5 h,反应温度48℃.该方法成本低、简单易行、原料油损耗率低,对山苍子果核油成分及性质影响较小,满足后续加氢实验要求,为得到高转化率生物航煤奠定了基础.

Though litsea cubeba nucleolus oil has been used to prepare low level products such as alkanolamides for a long time,the main constituents including lauric acid,are thought to be excellent raw materials for bio-based aviation fuels since the carbon atomic numbers are around 8- 16. Hydrogen peroxide decolorization,activated carbon /modified active floridin decolorization and phospholipase degumming methods were carried out to refine the oil and the best parameters were selected. It proves that the decolorization rate reaches up to 97. 33% and the content of phosphatide is reduced from 1. 036 mg /g to 0. 036 mg /g. The results show that the best parameters are as follows,W( H2O2) =15%,t =80min,T =110℃ for the H2O2decolorization; the ratio of weight( activated carbon /modified active floridin) = 1 /15,t = 40 min,T = 80 ℃,W( adsorbent) =4% for the composite adsorption decolorization; and W( phosphatidase) = 40 mg /kg,pH5. 1,t = 2. 5 h,T =48 ℃ for the phospholipase degumming. It provides a cheap and convenient way with low loss rate and little effect on the component to refine litsea cubeba nucleolus oil to get bio-based aviation fuels by hydrodeoxygenation and other reactions.