Method for purification of polyhydric alcohols
AssigneeEcodyne Corporation
InventorsRobert Kunin, Louis I. Blaine
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Abstract
A method for purification of polyhydric alcohols such as sugar syrup by removing chromophoric components, trace metals, and other impurities comprising preparing a liquid slurry mixture of filter particles, including an anion exchange resin, a cation exchange resin, and a filter aid material, the anion and cation exchange resins being smaller than about 100 mesh (about 150 microns); precoating a porous support means with the slurry mixture; and passing the polyhydric alcohol through the precoat layer and the porous support means to purify the alcohol. A further embodiment includes the step of regenerating the precoat layer by delivering a brine solution having a pH between 7 and 10 through the precoat layer.
Claims12
A method for purification of a polyhydric alcohol comprising:
- preparing a liquid slurry mixture of filter particles, including an anion exchange resin, a cation exchange resin, and a filter aid material, said anion exchange resin particles and said cation exchange resin particles being smaller than about 37 microns;
- precoating a porous support means with said slurry mixture to form a precoat layer;
- and
- passing the polyhydric alcohol through said precoat layer and said porous support means to purify the polyhydric alcohol.
A method of purifying sugar syrup by removing chromophoric components, trace metals and other impurities, comprising:
- preparing a mixture of filter particles in a size range of 10 to 30 microns in a liquid slurry, said filter particles including an anion exchange resin having a moisture content between 45 and 80 percent, a cation exchange resin, and a fibrous filter aid material;
- precoating a tubular, porous filter element with a layer of said filter particles by delivering the slurry mixture to said filter element so that a precoat layer of 0.1 to 1.0 pounds per square foot of filter element area is formed;
- and
- passing sugar syrup through said precoat layer and said filter element at a temperature between 120.degree. F. and 180.degree. F., and a flow rate of 0.1 to 2 gallons per minute per square foot.
Dependencies are inferred from the claim text.