engleski

Biodiesel production from higher alcohols with guanidine catalyst

Biodiesel is produced by transesterification of vegetable oil (triglycerides) with alcohol, mainly methanol and ethanol. Usually NaOH and KOH are used as catalyst, but they cause saponi-fication, if a higher content of water or free fatty acids is present, which is common for waste cooking oils. This study examines the application of N, N ′, N″-tris(3-dimethylaminopropyl)-gua-nidine as a catalyst for the transesterification of waste cooking oil with methanol, ethanol, 1-propanol, 2- propanol, 1-butanol, 2-butanol, iso-butanol, 1- pentanol, iso-pentanol, 1-hexanol, 1-heptanol, 1- octanol, 1-decanol, 1-dodecanol, and benzyl- alcohol. Conversions in the range from 70 up to 99 mol % (except for 2-propanol and 2-buthanol) were obtained after 5 h at 50°C with 3 wt. % of catalyst and at 1:6.2 molar ratio of vegetable oil and alcohol. Phase separation of biodiesel and glycerol immediately after the transesterification was present only for biodiesel produced with methanol, ethanol and 1-butanol.

biodiesel ; guanidine ; higher alcohols ; transesterification

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