US 5,512,692 AGranted

Process for removing glycerol from glycerides

AssigneeSiegfried Peter

InventorsSiegfried Peter, Bernd Czech, Eckard Weidner

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Abstract

Described is a process for removing glycerol and/or diglycerol from glycerides and glyceride mixtures by extraction, which process is characterized in that the glyceride or glyceride mixture is dissolved in organic compounds which preferably contain carbonyl and hydroxyl groups, if desired in combination with hydrocarbons, and that glycerol is extracted from the resulting solution with the aid of water. Thereby glycerol concentrations in the material to be purified of 0.1 weight % or lower may be obtained in a simple manner.

Claims18

Dependent claims

Process for removing glycerol and/or diglycerol from glycerides or glyceride mixtures by liquid-liquid extraction carried out under subcritical conditions, characterized in that the glyceride or glyceride mixture is dissolved in a solvent selected from the group consisting of:

solvent (a) consisting of:
i. 30 to 100 weight %, based on the admixture, of at least one organic compound having at least one functional group selected from the group consisting of a carbonyl group;
a sulfoxide group, a sulfone group, or a combination thereof and a solubility in water of at most 15 weight % and a boiling point of at most 200.degree. C. in mixture with:
ii. 0 to 70 weight %, based on the admixture, of at least one organic compound having a carbonyl and/or sulfoxide and/or sulfone group and a solubility in water of more than 15 weight %, and
iii. 0 to 70 weight %, based on the admixture, of at least one compound containing a hydroxyl group and having a boiling point of at most 200.degree. C.;
solvent (b) consisting of:
i. 5 to 95 weight %, based on the admixture, of at least one compound selected from the group of compounds set forth in (a), in mixture with:
ii. 5 to 95 weight %, based on the admixture, of at least one compound, having up to 20 carbon atoms, selected from the group consisting of hydrocarbons, halosubstituted hydrocarbons, ethers and combinations thereof;
solvent (c) consisting of:
i. 20 to 100 weight %, based on the admixture, of at least one ether having up to 20 carbon atoms, in mixture with:
ii. 0 to 80 weight %, based on the mixture, of at least one compound, having up to 20 carbon atoms, selected from the group consisting of hydrocarbons, halosubstituted hydrocarbons, and combinations thereof;
and
solvent (d) consisting of:
i. 5 to 100 weight %, based on the admixture, of carbon dioxide, in mixture with:
ii. 0 to 95 weight %, based on the admixture, of propane, butane, or both propane and butane;
the amounts of said solvent (a), (b), (c) or (d) being chosen so that the amount of the glycerides, or glyceride mixture, to be purified is 5 to 80 weight % of the resulting solution, and the glycerol, diglycerol or both is extracted from said resulting solution with the aid of water.

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Dependencies are inferred from the claim text.

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Abstract

solvent (a) consisting of:
i. 30 to 100 weight %, based on the admixture, of at least one organic compound having at least one functional group selected from the group consisting of a carbonyl group;
a sulfoxide group, a sulfone group, or a combination thereof and a solubility in water of at most 15 weight % and a boiling point of at most 200.degree. C. in mixture with:
ii. 0 to 70 weight %, based on the admixture, of at least one organic compound having a carbonyl and/or sulfoxide and/or sulfone group and a solubility in water of more than 15 weight %, and
iii. 0 to 70 weight %, based on the admixture, of at least one compound containing a hydroxyl group and having a boiling point of at most 200.degree. C.;
solvent (b) consisting of:
i. 5 to 95 weight %, based on the admixture, of at least one compound selected from the group of compounds set forth in (a), in mixture with:
ii. 5 to 95 weight %, based on the admixture, of at least one compound, having up to 20 carbon atoms, selected from the group consisting of hydrocarbons, halosubstituted hydrocarbons, ethers and combinations thereof;
solvent (c) consisting of:
i. 20 to 100 weight %, based on the admixture, of at least one ether having up to 20 carbon atoms, in mixture with:
ii. 0 to 80 weight %, based on the mixture, of at least one compound, having up to 20 carbon atoms, selected from the group consisting of hydrocarbons, halosubstituted hydrocarbons, and combinations thereof;
and
solvent (d) consisting of:
i. 5 to 100 weight %, based on the admixture, of carbon dioxide, in mixture with:
ii. 0 to 95 weight %, based on the admixture, of propane, butane, or both propane and butane;
the amounts of said solvent (a), (b), (c) or (d) being chosen so that the amount of the glycerides, or glyceride mixture, to be purified is 5 to 80 weight % of the resulting solution, and the glycerol, diglycerol or both is extracted from said resulting solution with the aid of water.

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