Optimization of steam explosion parameters in the pretreatment of sweet sorghum bagasse for bioethanol production

Date

4-2012

Degree

Bachelor of Science in Chemical Engineering

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

An optimization study using Central Composite DEsign (CCD) was done for the pretreat of sweet sorghum (Sorghum bicolor(L) Moench) bagasse using steam explosion technology. The treatment factors were saturated steam temperature and holding time while the response variables were reducing sugar yield (RSY) and index of inhibition (II). The statistical model based on RSY showed that steam explosion conditions in the lower to mid-range values (160ºC to 190ºC and 120 second to 240 seconds_ increased the sugar yield, while high-range values (higher than 220ºC and 480 seconds) decreased the sugar yield. The statistical model with index of inhibition as the response was disregarded due to the lack of correlation with the treatment factors. Numerical optimization of the statistical model based on RSY found an optimum condition of 203.4ºC and 304s. Experimental verification showed 19.80% reducing sugar yield, which agreed well with the predicted value of 20.77%. Calculations showed that around 2.00 MJ/Kg-bagasse and 3.20 PHP/Kg-bagasse were projected as the energy yield and revenue from the produced lignocellulosic bioethanol respectively. The ethanol production potential could still be possibly increased if optimum conditions for saccharification and fermentation are done.

Language

English

Location

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

Call Number

LG 993.5 2012 E62 L67

Document Type

Thesis

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