Parametric study on the pretreatment of Jatropha curcas L. press cake for cellulosic ethanol production

Date

4-2011

Degree

Bachelor of Science in Chemical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Jovita L. Movillon

Committee Member

Denise Ester O. Santiago, Rex B. Demafelis

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Abstract

A parametric study on the pretreatment of Jatropha curcas L. press cake using a two-stage alkaline-acid pretreatment was conducted. The alkaline-stage pretreatment using sodium hydroxide was first performed followed by acid-stage pretreatment using dilute sulfuric acid. For the first stage of pretreatment, the parameters varied were alkaline concentration, temperature and time. A total of 18 combinations of the parameters were conducted by varying the temperature at 80, 90 and 100°C; concentration at 1, 5 and 10% v/v sodium hydroxide; and time at 1 hour and 1.5 hours. Total sugar analysis using phenol-sulfuric method was conducted on each sample to determine the effect of the parameters on the sugar yield of the substrate. On the other hand, for the acid pretreatment stage, the effects of varying the parameters temperature, acid concentration and time on the sugar yield were determined. Again, the total number of combinations for this part was 18 since three temperatures (70, 80, 90°C), three concentration of sulfuric acid (0.5, 1 and 1.5%v/v) and two reaction time (1 and 1.5 hours) were varied. The results showed the best combination of parameters for the alkaline pretreatment stage was pretreatment using 5% v/v NaOH at 90°C for one hour while acid pretreatment for the press cake was most suitable when the experiment was conducted at 1% v/v sulfuric acid concentration, 80°C and one hour. Total and reducing sugar concentration from these combinations were 4.39 mg/ml and 5.04 mg/ml filtrate, respectively.

Language

English

LC Subject

Jatropha. Ethanol, Biomass energy

Location

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

Call Number

LG 993.5 2011 E62 P37

Document Type

Thesis

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