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 evaporating excess ethanol in the presence of a catalyst in conditions adapted to avoid inverse reaction of transesterification, the ethanol obtained being practically anhydrous (it may be recycled in the process without being rectified); a step (e) which consists in purifying the ester by washing sequences with water; and a step (f) which consists in drying the mixture of ester under reduced pressure.
摘要:
A method allowing, from natural fat or oils, vegetable or animal, or from other glyceride mixtures, to obtain in a quasi-quantitative way fatty acid ethyl esters that can be used as gas oil substitutes, comprises the succession of stages as follows: a stage (a) wherein the oil, the fat or the glyceride mixture is transesterified by ethanol using a soluble catalyst or a catalyst that becomes soluble during the reaction, a stage (b) wherein the glycerin formed is decanted and removed, without requiring an excess ethanol evaporation operation, a stage (c) wherein a second transesterification reaction is carried out so as to obtain a product whose ester content is at least 97% by mass, a stage (d) wherein controlled neutralization of the catalyst is carried out, a stage (e) wherein the excess ethanol is removed by distillation, a stage (f) wherein the ester undergoes purification by means of water wash sequences, and a stage (g) wherein the ester mixture is dried under reduced pressure.
摘要:
The invention concerns a method for making linear monocarboxylic acid ethyl esters of 6 to 26 carbon atoms from acid or neutral, virgin or recycled vegetable or animal oils. The method is characterized in that it includes: a step (1) which consists in reacting said vegetable or animal oil, with methanol, in the presence of a heterogeneous catalyst comprising a combination formed between at least one metal oxide and alumina or a combination formed between at least two oxides and optionally with alumina; and a step (2) which consists in reacting the product derived from step (1), with ethanol in the presence of a heterogeneous catalyst such as the heterogeneous catalyst defined for use in step (1). Said method enables a mixture of fatty acid esters rich in fatty acid ethyl esters and a high purity glycerin to be obtained from vegetable or animal oils.
摘要:
The invention relates to a method for producing biofuels by transforming triglycerides into at least two biofuel families: fatty acid monoesters and ethers and/or soluble glycerol acetals involving at least one transesterification stage consisting in reacting said triglyceride by heterogeneous catalysis with at least one type of primary monoalcohol selected between methanol and ethanol in such a way that at least one type of methyl and/or ethyl ester of fatty acid(s) of initial triglyceride(s) and a glycerol are produced, said products being devoid of sub-products, an esterification stage consisting in reacting glycerol with at least one type of olefinic hydrocarbon having from 4 to 12 carbon atoms an/or an acetalisation stage consisting in reacting glycerol with at least one compound selected between aldehydes, cetones and aldehyde or cetone acetal derivatives.