Pretreatment of sugarcane bagasse by sequential ammonium hydroxide impregnation and steam explosion for biofuel ethanol production

Date

12-2014

Degree

Bachelor of Science in Chemical Engineering

Major Course

Major in Sugar Technology

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Catalino G. Alfafara

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

This study investigated the pretreatment of sugarcane bagasse by sequential ammonium hydroxide (NH4OH) impregnation and steam explosion A factorial experiment was used to identify significant impregnation factors (NH4OH) concentration, contact time, temperature and solid-to-liquid ratio) affecting the response variable (reducing sugar yield, RSY). Statistical analyses showed that temperature and contact time were significant impregnation factors, but were not optimized due to safety and experimental set-up constraints. Response surface method was used to maximize the RSY from steam explosion. The factors optimized were (1) steam temperature and (2) contact time. Statistical analysis showed that a quadratic model best fitted the data. The model was significant, the lack of fit was desirably insignificant, the lack of fit was desirably insignificant, and the regression coefficients R2) were in reasonable agreement. Numerical optimization for steam explosion gave the following optimum condition: 176.37 degree and (2) 279.40 s with predicted RSY value of 33.83%. Experimental verification of the optimum condition gave an RSY value if 31.46% w/w which was close to the predicted value. Fermentation of the optimally impregnated-steam exploded bagasse resulted to a 60.89% glucose-to-ethanol conversion and a final ethanol yield of 0.41% v/v.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2014 E62 /F35

Document Type

Thesis

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