Optimization of solvent extraction of oil from microwave-pretreated Chlorella vulgaris Beyerinck microalgae using Response Surface Methodology (RSM) for biodiesel production

Date

4-2014

Degree

Bachelor of Science in Chemical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Denise Ester O. Santiago

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 a rotatable Central Composite Design (CCD) was done on the solvent extraction of oil from microwave-pretreated (Chlorella vulgaris micro algal biomass. The experimental factors were solvent-to-biomass ratio, temperature, and contact time while the response variable was oil yield. Prior to optimization, a two and full factorial design with center points was conducted for the detection of a significant curvature in the design space. The statistical model via RSM showed that contact time was the dominant factor affecting oil yield. Using numerical optimization of the statistical model based on oil yield, the optimum conditions were solvent-to-biomass ratio of 6.13 mL/g, temperature of 55°C, and contact time of 33.02 minutes. Experimental verification showed that the average oil yield of 3.5498% (w/w) from the confirmatory experiment agreed well with the predicted value of 3.9943% and was within the production interval (3.2431% to 4.6455%) of the confirmation node of the design expert 8.06, Software at 5% significance level. In this study, it was validated that using microwave (MW) as a pretreatment method for solvent extraction was effective. This was proven by the significant increase of about 80% in oil yield of the MW ? pretreated biomass as compared to the untreated one after the extraction process.

Language

English

Location

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

Call Number

LG 993.5 2014 E62 /V59

Document Type

Thesis

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