Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30517
A Comparison of Dilute Sulfuric and Phosphoric Acid Pretreatments in Biofuel Production from Corncobs

Authors: Jirakarn Nantapipat, Apanee Luengnaruemitchai, Sujitra Wongkasemjit


Biofuels, like biobutanol, have been recognized for being renewable and sustainable fuels which can be produced from lignocellulosic biomass. To convert lignocellulosic biomass to biofuel, pretreatment process is an important step to remove hemicelluloses and lignin to improve enzymatic hydrolysis. Dilute acid pretreatment has been successful developed for pretreatment of corncobs and the optimum conditions of dilute sulfuric and phosphoric acid pretreatment were obtained at 120 °C for 5 min with 15:1 liquid to solid ratio and 140 °C for 10 min with 10:1 liquid to solid ratio, respectively. The result shows that both of acid pretreatments gave the content of total sugar approximately 34–35 g/l. In case of inhibitor content (furfural), phosphoric acid pretreatment gives higher than sulfuric acid pretreatment. Characterizations of corncobs after pretreatment indicate that both of acid pretreatments can improve enzymatic accessibility and the better results present in corncobs pretreated with sulfuric acid in term of surface area, crystallinity, and composition analysis.

Keywords: Pretreatment, sulfuric acid, Corncobs, Phosphoric acid

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2992


[1] Sun, Y., and Cheng, J., (2002). Hydrolysis of lignocellulosic materials for ethanol production: A review. Bioresource Technology. 83, 1-11.
[2] Zheng, Y., Pan, Z.L., and Zhang, R.H. (2009). Overview of biomass pretreatment for cellulosic ethanol production. Agricultural and Bioenergy, 33, 1-7.
[3] Tangmanasakul, K., (2011). Combined Acid Pretreatment and Enzymatic Hydrolysis of Corn Cobs, M.S. Thesis, The Petroleum and Petrochemical College, Chulalongkorn University, unpublished.
[4] Satimanont, S., (2012). Dilute Phosphoric Acid Pretreatment of CornCob for Biofuels Production, M.S. Thesis, The Petroleum and Petrochemical College, Chulalongkorn University, unpublished.
[5] Romero, I., Moya, M., SÓ╣ünchez, S., Ruiz, E., Castro, E., and Bravo, V. (2007). Ethanolic fermentation of phosphoric acid hydrolysates from olive tree pruning, Industrial Crops and Products. 25, 160-168.
[6] Kumar, R., Mago, G., Balan V., and Wymand, C.E. (2009). Physical and chemical characterizations of corn stover and poplar solids resulting from leading pretreatment technologies. Bioresource Technology. 100, 3948-3962.
[7] Ezeji, T., Qureshi, N., and Blaschek, H.P. (2007). Butanol Production From Agricultural Residues: Impact of Degradation Products on Clostridium beijerinckii Growth and Butanol Fermentation. Biotechnology and Bioengineering, 97, 1460-1469.
[8] Redding, A.T., Wang, Z.Y., Keshwani, D.P., Cheng, J. (2011). High temperature dilute acid pretreatment of coastal Bermuda grass for enzymatic hydrolysis. Bioresource Technology, 102, 1415-1424.
[9] Yoshida, M., Liu, Y., Uchida, S., Kawarada, K., Ukagami, Y., Ivhinose, H., Kaneko, S., Fukuda, K. (2008). Effect of cellulose crystallinity, hemicelluloses, and lignin on the enzymatic hydrolysis of miscanthus sinensis to monosaccharides. Bioscience, Biotechnology, and Biochemistry, 72, 805-810.
[10] Kim, T.H., Kim, J.S., Sunwoo, C., and Lee, Y.Y. (2003). Pretreatment of corn stover by aqueous ammonia. Bioresource Technology. 90, 39- 47.
[11] Gabhane, J.D., William Prince, S.P.M., Vaidya, A.N., Mahapatra, C.T. (2011). Influence of heating source on the efficacy of lignocellulosic pretreatment-A cellulosic ethanol perspective. Biomass and Bioenergy, 35, 96-102.