Optimization and Kinetic Study of Cellulose Hydrolysis to Glucose Catalyzed by Phosphoric Acid (H3po4)

International Journal of Advanced Research in Chemical Science Pub Date : 2020-01-01 DOI:10.20431/2349-0403.0707003

Okereke Macjonathan Chimchetam, V. A. Wirnkor, Duru Edbert Chidi

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Abstract

The hydrolysis of cellulose to glucose at the temperature of 100o C using phosphoric acid as catalyst was studied in this work. The effect of acid concentration on glucose yield with 1 g of biomass weight was studied at H3PO4 concentrations of 1 %, 2 %, 4 %, 8 %, 15 % and 20 %. It was found that glucose yield is directly proportional to acid concentration, with best yield of glucose being 21 mg in 35 minutes at acid concentration of 15 %. The hydrolysis could not take place at other concentrations studied. The effect of biomass weight on glucose yield was carried out with 0.5 g, 1.0 g, 1.5 g and 2.0 g of biomass. Results showed that 1.5 g and 2.0 g gave both 22 mg of glucose, while the other biomass weights gave 0 mg. This also indicated a proportional relationship between biomass weight and glucose yields. Optimization studies were carried out using the best values of acid concentration and biomass weight. The results showed that rate of cellulose hydrolysis at these conditions was 0.957 mg/min. The results obtained from this study showed that phosphoric acid is not a good catalyst for cellulose hydrolysis.

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磷酸(H3po4)催化纤维素水解葡萄糖的优化及动力学研究

研究了以磷酸为催化剂，纤维素在1000℃下水解成葡萄糖的过程。在H3PO4浓度为1%、2%、4%、8%、15%和20%的条件下，研究了酸浓度对1 g生物质重量下葡萄糖产率的影响。结果表明，葡萄糖的产率与酸浓度成正比，在酸浓度为15%的条件下，35分钟内葡萄糖的最佳产率为21 mg。在所研究的其他浓度下不发生水解。在生物量为0.5 g、1.0 g、1.5 g和2.0 g时，研究生物量重量对葡萄糖产率的影响。结果表明，1.5 g和2.0 g生物量均给予22 mg葡萄糖，其他生物量均给予0 mg葡萄糖。这也表明了生物量和葡萄糖产量之间的比例关系。利用酸浓度和生物量的最佳值进行了优化研究。结果表明，在此条件下，纤维素的水解速率为0.957 mg/min。研究结果表明，磷酸不是纤维素水解的良好催化剂。

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International Journal of Advanced Research in Chemical Science

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