磷钨酸/聚乙烯醇催化膜制备生物柴油的研究

Study of biodiesel production by tungstophosphoric acid/poly (vinyl alcohol) catalytic membrane

关键词:  生物柴油  磷钨酸  催化膜  聚乙烯醇 

Key words:  biodiesel  tungstophosphoric acid  catalytic membrane  poly (vinyl alcohol)

摘要:

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,大豆油最大转化率达到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。 

Abstract:

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 in soybean oil, different co-solvents and the addition of the co-solvents 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 little effects on the transesterification reaction. The recycling times of the catalytic membrane crosslinked by glutaraldehyde was better than that of non-crosslinked catalytic membrane. The conversion of soybean oil was not significantly decreased after the catalytic membrane crosslinked being used for six runs.