Microwave-mediated non-catalytic transesterification of algal biomass under supercritical ethanol conditions

Prafulla D. Patil, Harvind Reddy, Tapaswy Muppaneni, Sundaravadivelnathan Ponnusamy, Peter Cooke, Tanner Schuab, Shuguang Deng

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

A novel integrated approach has been proposed to convert lipid-rich, dry algae (Nannochloropsis salina) into fatty acid ethyl esters (FAEE) under microwave-mediated supercritical ethanol (MW-SCE) conditions with a non-catalytic transesterification approach. This process enables simultaneous extraction of lipids from algal biomass and conversion/transesterification of them into algal biodiesel in a relatively short reaction time, which may reduce energy consumption versus traditional processes due to simplified separation and purification steps. High conversion rates can be possible when the extractive-transesterification of algal biomass is performed near-critical or supercritical conditions. The use of passive heating elements made of silicon carbide (SiC) to aid the microwave-mediated heating process at higher temperatures is also described. Experimental runs were designed to optimize the process parameters to evaluate the effect on the algal biodiesel under controlled power conditions. The algal biomass characterization and algal biodiesel analysis were performed using various analytical instruments such as FTIR, SEM-EDS, TGA and GC-MS. It was demonstrated in this work that this direct conversion technique has the potential to provide an energy-efficient and economical route for algal biodiesel production.

Original languageEnglish (US)
Pages (from-to)67-72
Number of pages6
JournalJournal of Supercritical Fluids
Volume79
DOIs
StatePublished - 2013
Externally publishedYes

Fingerprint

Biofuels
Transesterification
biomass
Biodiesel
Biomass
Ethanol
ethyl alcohol
Microwaves
microwaves
lipids
Lipids
heating
energy consumption
algae
fatty acids
Electric heating elements
purification
reaction time
silicon carbides
Microwave heating

Keywords

  • Algal biomass
  • Biodiesel
  • Extractive transesterification
  • Microwave irradiation
  • Supercritical ethanolysis

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Chemical Engineering(all)
  • Condensed Matter Physics

Cite this

Microwave-mediated non-catalytic transesterification of algal biomass under supercritical ethanol conditions. / Patil, Prafulla D.; Reddy, Harvind; Muppaneni, Tapaswy; Ponnusamy, Sundaravadivelnathan; Cooke, Peter; Schuab, Tanner; Deng, Shuguang.

In: Journal of Supercritical Fluids, Vol. 79, 2013, p. 67-72.

Research output: Contribution to journalArticle

Patil, Prafulla D. ; Reddy, Harvind ; Muppaneni, Tapaswy ; Ponnusamy, Sundaravadivelnathan ; Cooke, Peter ; Schuab, Tanner ; Deng, Shuguang. / Microwave-mediated non-catalytic transesterification of algal biomass under supercritical ethanol conditions. In: Journal of Supercritical Fluids. 2013 ; Vol. 79. pp. 67-72.
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