Decolorization of aqueous saccharide solutions and sorbents...

Details Decolorization of aqueous saccharide solutions and sorbents... Decolorization of aqueous saccharide solutions and sorbents...

C - Chemistry, Metallurgy

13

B

252/23, 260/234.

C13B 20/12 (2011.01)

Patent

CA 1291108

ABSTRACT OF THE DISCLOSURE The invention is a process for the removal of impuri- ties comprising phenolics, dextrans or amino nitrogen from an aqueous saccharide solution. The solution is contacted with a sorbent, which itself is also an embodiment of the invention, comprising a cationic nitrogenous surfactant, the molecules of which contain at least one alkyl group of at least 8 carbon atoms, deposited on the surface of a micropo- rous hydrophobic polymeric support. The deposition is ac- complished by contacting a solution of the surfactant in an appropriate solvent with the support. The impurities are adsorbed onto the sorbent and the aqueous saccharide solu- tion is removed from contact with the sorbent. The solvent must be completely miscible with the saccharide solution and the solution of the surfactant in the solvent must have a maximum sorbent wetting rate of at least 100 g/m2?min., and a sorbent bed retention of at least 140%, based on the bed interstitial volume. The partitioning coefficient of the impurities in the surfactant and solvent deposited on the support, as compared to in water, must be at least 20. The process is extremely effective in removing impurities from saccharide solutions having very high concentrations of impurities, and at very high flow rates.

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