Parametric and local optimization studies of two-stage high temperature dilute acid hydrolosis of rice (Oryza sativa) for xylose extraction

Date

2012

Degree

Bachelor of Science in Chemical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

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

The Rice (Oryza sativa) straw samples were analyzed for its composition, and afterwards hydrolyzed by the fiorst stage of acid hydrolysios. The composition of the rice straw is 2.44% acid soluble lignin, 38.17% acid soluble lignin, 25.29 hemicellulose,34.86% alphacellulose (lignin to cellulose is on extractive-free and moisture-free basis),4.31% extractives (moisture-free basis), 23.01% ash. For the second stage of hydrolysis, the different factors considered were acid concentration (2, 4, 6% v/v H₂SO₄), temperature (104.44, 115.56, 126.67ºC), and reaction time (15,37.5, 60 min). It was observed that only the acid concentration, the interaction between temperature and reaction time, and the interaction between all three conditions had significant effect. Generally, as the acid concentration increases, the xylose yield decreases. the pattern on the temperature is that as its increases, the xylose yield decreases. On the reaction time, the xylose yield decreases as it increases. The point of most desirability was computed to be at 2% v/v acid, 104.44ºC, and 15 minutes. The predicted yield at the maximum desirability point 1.00237%. There was no furfural detected before and after the detoxification.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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