초록 ▼

Nanofiltration is used to decolorize sugar juice or syrup. The resulting permeate may be used directly to crystallize white sugar without an intermediate step of producing a raw sugar; even though the color of the permeate is substantially higher than the highest color that is acceptable in a conven

Nanofiltration is used to decolorize sugar juice or syrup. The resulting permeate may be used directly to crystallize white sugar without an intermediate step of producing a raw sugar; even though the color of the permeate is substantially higher than the highest color that is acceptable in a conventionally decolorized syrup used to crystallize white sugar. Significant cost savings are thus achieved in producing white sugar.

대표청구항 ▼

[ I claim:] [1.] A process for producing white crystalline sucrose from an aqueous liquid comprising a clarified cane sugar juice, a clarified cane sugar syrup, a clarified cane sugar molasses, or a clarified cane sugar refinery liquor; wherein the liquid is essentially free from compounds having a

[ I claim:] [1.] A process for producing white crystalline sucrose from an aqueous liquid comprising a clarified cane sugar juice, a clarified cane sugar syrup, a clarified cane sugar molasses, or a clarified cane sugar refinery liquor; wherein the liquid is essentially free from compounds having a molecular weight greater than about 500,000, and wherein the liquid has a color between about 5,000 IU and about 25,000 IU; wherein a solid-phase raw sugar is present at no point during said process; and wherein said process comprises the steps of:(a) filtering the liquid across a membrane with a molecular weight cut-off between about 2,000 and about 10,000 to produce a permeate having a color less than or equal to about 3,000 IU; and(b) crystallizing sucrose from the permeate, to produce white crystalline sucrose having a color less than or equal to about 50 IU.