Separation and purification of sugar esters
First Claim
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1. A method for purifying a sugar ester product from a crude reaction mixture containing the sugar ester product, which is produced by a solvent-free, transparent emulsion process, which consists essentially of:
- dissolving the crude reaction mixture in a lower aliphatic alcohol to produce a solution with undissolved residue;
removing undissolved residue from the solution to produce a clarified solution; and
combining the clarified solution with a volume of water that is approximately 1 to 5 times the volume of the clarified solution to form a precipitate of the purified sugar ester.
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Abstract
The process uses two steps to separate the sugar ester from the crude sugar ester reaction product. The first step entails forming a precipitate of sugar ester from a mixture of alcohol, water and crude sugar ester reaction product. In a second subsequent step, the recovered sugar ester precipitate is washed with an organic solvent.
43 Citations
16 Claims
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1. A method for purifying a sugar ester product from a crude reaction mixture containing the sugar ester product, which is produced by a solvent-free, transparent emulsion process, which consists essentially of:
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dissolving the crude reaction mixture in a lower aliphatic alcohol to produce a solution with undissolved residue; removing undissolved residue from the solution to produce a clarified solution; and combining the clarified solution with a volume of water that is approximately 1 to 5 times the volume of the clarified solution to form a precipitate of the purified sugar ester. - View Dependent Claims (2, 3, 4, 5, 6, 7, 16)
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8. A method for purifying a sugar ester product from a solvated, crude reaction mixture containing the sugar ester product, which is produced by a solvated transesterification process, which consists essentially of:
combining the solvated, crude reaction mixture with a solvent system of water and a lower aliphatic alcohol wherein the volume of the solvent system is approximately equal to the volume of solvated, crude reaction mixture and the volume to volume proportion of water to alcohol in the system is from about 90;
10 to about 10;
90, to form a precipitate of the purified sugar ester product.- View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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