论文部分内容阅读
以聚乙烯醇(PVA)为载体,磷钨酸(HWP)为催化粒子,通过溶剂挥发法制备HWP/PVA催化膜,研究并优化HWP/PVA质量比、催化膜厚度、原料油中含水率、共溶剂种类、共溶剂添加量对大豆油转化率的影响。实验结果表明,经优化制备的HWP/PVA催化膜在最佳反应条件下,大豆油转化率达到最大值90.6%。当原料油中的含水率≤5%(w)时,催化膜可以吸收原料油中的水分,原料油中的水分对酯交换反应影响较小。经过戊二醛交联后的催化膜较未交联催化膜重复使用性好。交联的催化膜使用6次后,大豆油转化率没有明显下降。A catalytic membrane from tungstophosphoric acid (HWP) as the catalyst and poly(vinyl alcohol) as the carrier were prepared by the solvent evaporation method. The effects of HWP/PVA mass ratio of the catalytic membrane, membrane thickness, the water content of soybean oil, different co-solvents and the amount of the co-solvent on the catalytic performances of HWP/PVA membrane were studied. The experimental results indicated that under the optimum reaction conditions, the conversion of soybean oil reached a maximum of 90.6%. When the water content of soybean oil was below 5 wt%, the HWP/PVA catalytic membrane could absorb the water in soybean oil, and the water had few effects on the transesterification reaction. The recycling times of the catalytic membrane crosslinked by glutaraldehyde was better than that of non-crosslinked catalytic membrane. After six runs, the conversion of soybean oil was not significantly decreased.
The HWP / PVA catalytic membrane was prepared by the solvent evaporation method using polyvinyl alcohol (PVA) as support and HWP as catalytic particle. The effects of HWP / PVA mass ratio, catalytic membrane thickness, moisture content in feedstock oil, Effect of co - solvents and cosolvent addition on the conversion of soybean oil. The experimental results show that under the optimal reaction conditions, the conversion of soybean oil reached the maximum of 90.6% after the optimized preparation of HWP / PVA catalytic membrane. When the moisture content in the feedstock is less than or equal to 5% (w), the catalytic membrane can absorb the moisture in the feedstock oil and the moisture in the feedstock oil has less effect on the transesterification reaction. After glutaraldehyde cross-linked catalytic membrane than the non-cross-linked catalytic membrane reusability. After six times of cross-linking of the catalytic membrane, there was no obvious decrease in the conversion of soybean oil. The catalytic effect of HWP / PVA mass ratio of the catalytic membrane, membrane thickness, the water content of soybean The experimental results indicated that under the optimum reaction conditions, the conversion of soybean oil reached a maximum of 90.6%. When the water content of soybean oil was below 5 wt%, the HWP / PVA catalytic membrane could absorb the water in soybean oil, and the water had few effects on the transesterification reaction. The recycling times of the catalytic membrane crosslinked by glutaraldehyde was better than that of non-crosslinked catalytic membrane. After six runs, the conversion of soybean oil was not significantly decreased.