Process for the production of ethyl esters
First Claim
1. A process for the production of ethyl esters of fatty acids from a fatty acid glycerides starting substance selected from the group consisting of vegetable oil, animal oil, fat and or mixtures of glycerides, the process comprising the following stages:
- (a) transesterifying the fatty acid glyceride starting substance with hydrated ethyl alcohol at a temperature of 5 to 50°
C. using an alkaline catalyst to form a medium comprising ethyl esters and excess ethyl alcohol said hydrated ethyl alcohol having an ethyl alcohol content of 92 to 99% by weight and being in a proportion of 30-100% by weight with respect to the starting substance;
(b) adding a glycerine phase to said medium, and evaporating the excess ethyl alcohol to produce two immiscible phases, an ester phase and a glycerine phase A, and recycling said excess ethyl alcohol to stage (a), said excess ethyl alcohol having an ethyl alcohol content at least equal to the alcohol content of the hydrated ethyl alcohol used in step (a);
(c) separating said glycerine phase A and said ester phase to obtain the desired ethyl esters;
(d) neutralizing said glycerine phase A with acid, and separating resultant "fatty acids+esters" phase and a glycerine phase B, and drying the latter phase; and
(e) subjecting the "fatty acids+esters" phase to glycerolysis with at least a fraction of the dried glycerine phase B in the presence of an alkaline catalyst to form a mixture of glycerides and esters, and passing said mixture into transesterification stage (a).
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Abstract
For the production of ethyl esters of fatty acids from fatty acid glycerides such as vegetable or animal oil or fat or other mixtures of glycerides, the process comprises the following stages: (a) transesterifying fatty acid glycerides with hydrated ethyl alcohol using an alkaline catalyst to form a medium comprising ethyl esters and excess ethyl alcohol; (b) adding a glycerine phase to said medium, and evaporating the excess ethyl alcohol to produce two immiscible phases, an ester phase and a glycerine phase A, and recycling said excess ethyl alcohol to stage (a); (c) separating said glycerine phase A and said ester phase to obtain the desired ethyl esters; (d) neutralizing said glycerine phase A with acid, and separating resultant "fatty acids+esters" phase and a glycerine phase B, and drying the latter phase; (e) subjecting the "fatty acids+esters" phase to glycerolysis with at least a fraction of the dried glycerine phase B in the presence of an alkaline catalyst to form a mixture of glycerides and esters, and passing said mixture into transesterification stage (a).
40 Citations
18 Claims
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1. A process for the production of ethyl esters of fatty acids from a fatty acid glycerides starting substance selected from the group consisting of vegetable oil, animal oil, fat and or mixtures of glycerides, the process comprising the following stages:
- (a) transesterifying the fatty acid glyceride starting substance with hydrated ethyl alcohol at a temperature of 5 to 50°
C. using an alkaline catalyst to form a medium comprising ethyl esters and excess ethyl alcohol said hydrated ethyl alcohol having an ethyl alcohol content of 92 to 99% by weight and being in a proportion of 30-100% by weight with respect to the starting substance;
(b) adding a glycerine phase to said medium, and evaporating the excess ethyl alcohol to produce two immiscible phases, an ester phase and a glycerine phase A, and recycling said excess ethyl alcohol to stage (a), said excess ethyl alcohol having an ethyl alcohol content at least equal to the alcohol content of the hydrated ethyl alcohol used in step (a);
(c) separating said glycerine phase A and said ester phase to obtain the desired ethyl esters;
(d) neutralizing said glycerine phase A with acid, and separating resultant "fatty acids+esters" phase and a glycerine phase B, and drying the latter phase; and
(e) subjecting the "fatty acids+esters" phase to glycerolysis with at least a fraction of the dried glycerine phase B in the presence of an alkaline catalyst to form a mixture of glycerides and esters, and passing said mixture into transesterification stage (a). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 17)
- (a) transesterifying the fatty acid glyceride starting substance with hydrated ethyl alcohol at a temperature of 5 to 50°
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11. In a process for the production of ethyl esters of fatty acids from a starting substance selected from the group consisting of vegetable or animal oil fat, and mixtures of glycerides, the improvement comprising transesterifying the starting substance with a hydrated ethyl alcohol having a content of 92 to 99% by weight of ethyl alcohol, said hydrated ethyl alcohol being in a proportion of 30 to 100% by weight of ethyl alcohol with respect to the starting substance, said transesterifying being conducted in the presence of an alkaline catalyst and at a temperature of 5 to 50°
- C., evaporating the excess ethyl alcohol and separating the resultant glycerine and ethyl esters.
- View Dependent Claims (12, 13, 14, 15, 16, 18)
Specification