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US 5,491,226 AGranted
Process for preparing polyol polyesters having low levels of triglycerides
AssigneeThe Procter & Gamble Company
InventorCorey J. Kenneally
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Abstract
A process for preparing polyol fatty acid polyesters having levels of triglyceride below 0.5% is described. Methyl esters having a level of monoglycerides below 500 ppm, a nondetectable level of di- and triglyceride and a glycerine level of less than about 200 ppm are prepared and then used in a two-stage, solvent-free transesterification reaction to prepare the polyol fatty acid polyesters.
Claims14
A process for preparing fat-free nondigestible polyol fatty acid polyesters, which process comprises the steps of:
- A. preparing fatty acid monohydric lower alkyl esters having a level of monoglycerides below 500 ppm, a non-detectable level of di- and triglyceride and a glycerine level below 200 ppm by (1) reacting a fatty acid glycerol ester with a monohydric lower alkyl alcohol in the presence of a suitable catalyst to produce a mixture of fatty acid monohydric lower alkyl esters, fatty acid glycerol esters and glycerol;
- (2) separating the mixture produced in step (1) into a glycerine phase and a fatty acid monohydric lower alkyl ester-containing phase which fatty acid monohydric lower alkyl ester-containing phase has a level of residual mono-, di-, and triglycerides below 2.5%;
- (3) water washing the fatty acid monohydric lower alkyl ester-containing phase under conditions suitable to provide a fatty acid monohydric lower alkyl ester phase containing less than 300 ppm glycerine, and (4) distilling the fatty acid monohydric lower alkyl esters under conditions suitable to provide fatty acid monohydric lower alkyl esters having a level of monoglycerides below 500 ppm, a non-detectable level of di- and triglyceride and a glycerine level below 200 ppm;
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- B. transesterifying the fatty acid monohydric lower alkyl esters and a polyol to provide a polyol fatty acid polyester having a triglyceride level of less than 0.5% in a solvent-free two-stage process wherein the first stage comprises forming polyol fatty acid partial esters from a reaction mixture containing a polyol having more than 4 esterifiable hydroxy groups and at least a portion of the fatty acid esters of the easily removable alcohol in the presence of an effective amount of a basic catalyst and optionally an effective amount of soap emulsifier, and wherein the second stage comprises forming highly esterified polyol fatty acid polyesters from a reaction mixture containing the polyol fatty acid partial esters, the remaining portion of the fatty acid esters and an effective amount of a basic catalyst.
2 more elements
A process for preparing fat-free nondigestible polyol fatty acid polyesters, which process comprises the steps of:
- A. preparing fatty acid methyl esters having a level of monoglycerides below 500 ppm, a non-detectable level of di- and triglyceride and a glycerine level below 200 ppm by (1) reacting a fatty acid glycerol ester with a methyl alcohol in the presence of a suitable catalyst to produce a mixture of fatty acid methyl esters, fatty acid glycerol esters and glycerol;
- (2) separating the mixture produced in step (1) into a glycerine phase and a fatty acid methyl ester-containing phase which fatty acid methyl ester-containing phase has a level of residual monoglycerides below 2.5% and a non-detectable level of di-or triglycerides;
- (3) washing the fatty acid methyl ester-containing phase with from about 2% to about 50% by weight water in a stirred tank, a column or an in-line static mixer with a residence time of from about 0.5 to about 60 minutes at a temperature of from about 21.1.degree. C. to about 93.3.degree. C. at atmospheric pressure;
- (4) separating the water phase from the ester phase to produce an ester phase having a level of glycerin below 300 ppm;
- and (5) distilling the fatty acid methyl esters at a pressure of from about 0.005 mm Hg to about 30 mm Hg and a temperature of from about 121.1.degree. C. to about 301.6.degree. C.;
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- B. transesterifying the fatty acid methyl esters and a polyol in a solvent-free, two-stage process to provide a polyol fatty acid polyester containing less than about 0.5% triglycerides, wherein the first stage comprises forming polyol fatty acid partial esters from a reaction mixture containing a polyol having more than 4 esterifiable hydroxy groups and at least a portion of the fatty acid esters of the easily removable alcohol in the presence of an effective amount of a basic catalyst and optionally an effective amount of soap emulsifier, and wherein the second stage comprises forming highly esterified polyol fatty acid polyesters from a reaction mixture containing the polyol fatty acid partial esters, the remaining portion of the fatty acid esters and an effective amount of a basic catalyst.
4 more elements
Dependencies are inferred from the claim text.