Esterification of free fatty acids in biodiesel production with sulphonated pyrolysed carbohydrate catalysts

Anders Theilgaard Madsen, Anders Riisager, Rasmus Fehrmann

Research output: Contribution to conferencePosterResearchpeer-review

Abstract

The pre-treatment of free fatty acids in oils and fats in biodiesel production is of pivotal importance, and esterification in acidic medium must be done prior to basic transesterification of glycerides. The free fatty acids may be converted over an acidic catalyst of sulphonated pyrolysed carbohydrates. These were prepared by pyrolysis of the carbohydrates in inert atmosphere at 300-450°C in 1-15 h and sulphonation in concentrated or fuming sulphuric acid at 150°C. A monophasic fatty model mixture of lauric acid, tricaprylate and methanol was subsequently treated with the prepared catalysts. Conversion of free fatty acids to methyl esters were monitored by gas chromatography. Sulphonated pyrolysed sugar or starch showed free fatty acid conversions of about 75% in 1 h and about 95% in 3 h.
Original languageEnglish
Publication date2009
Publication statusPublished - 2009
Event9th European Congress on Catalysis: Catalysis for a Sustainable World - Salamanca, Spain
Duration: 30 Aug 20094 Sep 2009
Conference number: 9
http://www.europacat2009.eu/

Conference

Conference9th European Congress on Catalysis
Number9
Country/TerritorySpain
CitySalamanca
Period30/08/200904/09/2009
Internet address

Keywords

  • free fatty acid
  • biodiesel production
  • esterification

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