Dilute Acid Hydrolysis of Cowpea Hulls: A Kinetic Study

Chioma M. Onyelucheya, Tagbo J. Nwabanne, Okechukwu E. Onyelucheya, Onyinye E. Onuoha


In this study, dilute acid hydrolysis of cowpea hulls was carried out in two stages under the following conditions: pre-hydrolysis (4%v/v H2SO4, 121˚C, 30 minutes) and hydrolysis ( at 10% and 15% v/v H2SO4,varied at different temperatures 150 oC, 160 oC, 170 oC and 180 oC for 2.5 hrs.). The substrate was characterized using both Fourier transform infrared spectroscopy and proximate analysis. The percentage lignocellulosic composition of the substrate was obtained for cellulose, hemicellulose and lignin as 34%, 14% and 4.7% respectively. Maximum glucose concentration of 8.09g was obtained using 10%v/v acid concentration at 170˚C after a reaction time of 90min. Saeman’s model gave a good fit for the experimental data. Activation energy for glucose formation using 10%v/v and 15%v/v H2SO4 was obtained as 38.28KJ and 82.204KJ respectively. From the results obtained it can be concluded that cowpea hulls can be converted to a useful product.


Acid hydrolysis; Agricultural waste; Cowpea Hulls; Glucose; Kinetic study.

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DOI: http://dx.doi.org/10.18517/ijaseit.6.4.866


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