| 摘要 |
The invention concerns a method for obtaining quasi-quantitative fatty acid ethyl esters useful as diesel oil substitutes, from natural, vegetable or animal, oils or fats, or other mixtures of glycerides, including the following successive steps: a step (a) which consists in transesterifying the oil, fat or the mixture of glycerides with ethanol using a soluble catalyst, or a catalyst becoming soluble during the reaction; a step (b) which consists in decanting and eliminating the formed glycerin, without resorting to evaporation of excess ethanol; a step (c) which consists in performing a second transesterification reaction to obtain a product whereof the ester content is at least 97 wt. %; a step (d) which consists in controlled neutralizing of the catalyst; a step (e) which consists in eliminating by distillation excess ethanol; a step (f) which consists in purifying the ester by washing sequences with water; and a step (g) which consists in drying the mixture of ester under reduced pressure. |
