Sugar Production from the Hydrolysis of Biomass under Hot Compressed-Waterin the Presence of Solid Acid Catalysts

Name: Nutrada Tamthiengtrong

keyword: Biomass

Abstract: The hydrolysis of eucalyptus (containing 45% cellulose, 2 1 % hemicelluloses and 30% lignin) under Hot Compressed Water (HCW) condition in the presence of various catalysts i.e. solid acid catalysts (H2S04-Activated carbon, H3PO4-Activated carbon, HC1-Activated carbon, HNO3-Activated carbon, H2S04-Glucose, H2S04-Sucrose) and liquid H2S04 catalyst was studied with an aim to maximize the yield of sugar production. Prior to the catalyst testing, the effects of operating conditions (i.e. reaction temperature, particle size of material, and retention time) were studied. It was found that the suitable operating conditions for hydrolysis of eucalyptus were using 0.l g eucalyptus (with the particle size of 106-250 pm) in the presence of 5% of catalyst and 1 ml of DI water at 20 bar, 200°C (with the heating rate of 10 °C/min) for 5 min. Under these conditions, the main products from the reaction are glucose and xylose with slight formations of HMF and furfural as by-products. In the presence of solid acid catalysts, the yields of sugar are relatively higher than the reaction without catalyst, fiom which the highest sugar yield of 22% can be enhanced by applying H3P04-activated carbon as catalyst. Importantly, it was found that lignin presenting in eucalyptus plays an important role on the hydrolysis performance, fiom which lignin greatly promotes the hydrolysis of cellulose and xylan under HCW condition in the presence of solid acid catalyst. For better understanding of the mechanism of biomass hydrolysis, the hydrolysis of cellulose and xylan (as the representative of hemicellulose) were also studied. The suitable conditions for hydrolyzing cellulose appeared to be at the reaction temperature of 230-250°C with the reaction time of 3 min at 20 bar. The main products of the reaction are C6 sugar with slight formation of HMF and furfural. For the hydrolysis of xylan, the suitable hydrolysis conditions are at the reaction temperature of 200°C with the reaction time of 9 min at 20 bar. The main products of the reaction are C5 sugar with slight formation of only furfural. Importantly, it was revealed that the presence of catalyst does not promote the hydrolysis of cellulose and xylan unlike the reaction without catalyst. The important parameter that strongly affects the yield of sugar production fiom the hydrolysis of cellulose and xylan seems to be the operating conditions i.e. reaction temperature, reaction time and heating rate.

King Mongkut's University of Technology Thonburi. KMUTT Library

Address: BANGKOK

Email: info.lib@mail.kmutt.ac.th

Name: Nutrada Tamthiengtrong

Role: Advisor

Created: 2011

Modified: 2555-11-08

Issued: 2012-10-30

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: JGSEE298

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Energy Management Technology

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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