| 主权项 |
1. A process for producing a biodiesel fuel comprising a mixture of fatty acid esters, said mixture containing a naturally occurring non-fossil compound of formula ROOC—(CH2)n—CH2—R1, in which R is either CH3 or C2H5, n is 7 or 9, and R1 is either C2H5 or CH═CH2, said non-fossil compound comprising a C11 and/or C13 ω-unsaturated ester, the content of said non-fossil compound in said mixture being between 20 and 70%, the said process comprising
utilizing, as raw material, oil resulting from castor and/or lesquerella seeds, subjecting said oil to a reaction for transesterification of triglycerides of the oil with an alcohol to form a mixture comprising glycerol, nonhydroxylated fatty esters, and ricinoleic and/or lesquerolic acid hydroxy esters, separating the glycerol from the mixture, separating the nonhydroxylated fatty esters to form a fraction enriched in ricinoleic and/or lesquerolic acid hydroxy esters, cracking the fraction enriched in ricinoleic and/or lesquerolic acid hydroxy esters to form a mixture comprising heptanaldehyde and acid esters of formula ROOC—(CH2)n—CH2—R1 in which R is either CH3 or C2H5, n is 7 or 9, and R1 is CH═CH2, without having an effect on residual C18 unsaturated esters, separating the heptanaldehyde from the mixture, and mixing an effluent comprising C11 and/or C13 ω-unsaturated esters and ricinoleic and/or lesquerolic acid hydroxy esters not converted during the preceding cracking with the previously separated nonhydroxylated fatty esters to form said biodiesel fuel. |
