C - Chemistry – Metallurgy – 11 – B
Patent
C - Chemistry, Metallurgy
11
B
C11B 11/00 (2006.01) C07C 67/58 (2006.01) C07C 69/58 (2006.01) C10L 1/02 (2006.01) C10L 1/18 (2006.01) C11B 7/00 (2006.01) F02B 3/06 (2006.01)
Patent
CA 2120661
Abstract of the Disclosure: Mixtures of fatty acid esters of low monovalent alcohols, for instance ethanol and methanol, are fractionated by extractive crystallization using urea. The starting material has a given solidification point, a first fraction is obtained with a relatively lower and a second fraction is obtained with a relatively higher solidification point than the given solidification point of the starting material. A fatty acid ester mixture is reacted with an aqueous urea solution by intensive mixing. The solid urea adduct thus obtained is mechanically separated out, leaving a mixture of two liquid phases. An oily phase (fraction F1) with the fatty acid esters having the relatively lower solidification point is separated from the aqueous urea solution. The solid urea adduct is then heated for dissociating into two liquid phases, including a light, oily phase (fraction F2), which are the fatty acid esters with the higher solidification point. The light oily phase is then separated outfrom the aqueous urea solution. Finally, the aqueous urea solutions obtained in the two separating steps are combined for use in a renewed fractionation. The oily phase (fraction F1) is used as a substitute Diesel fuel for Diesel engines above 0°C and the light, oily phase (fraction F2) at temperatures as low as -25°C.
Ridout & Maybee Llp
Wimmer Theodor
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