Bulk lactulose/lactose separation by selective adsorption on zeolitic molecular sieves
AssigneeUnion Carbide Corporation
InventorsChien C. Chao, John D. Sherman
Life of this patent
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Abstract
Lactulose is selectively adsorbed from admixture with lactose using specific cationic forms (particularly barium or potassium) of modified zeolite Y.
Claims5
A process for separating lactulose from admixture with lactose by selective adsorption which comprises contacting a mixture comprising said compounds at a temperature of from 30.degree. C. to 100.degree. C. and at a pressure sufficient to maintain the system in the liquid phase with an adsorbent composition comprising at least one crystalline aluminosilicate zeolite selected from a group consisting of modified zeolite Type Y having a cation site concentration of from about 40 to about 10 equivalents per mole unit cell and a face centered cubic unit cell having an a.sub.o for the decationized form of from 24.3 to 24.6 A in which the zeolitic cations are more than 50% barium or potassium, whereby lactulose is selectively adsorbed thereon;
- removing the nonadsorbed portion of said mixture from contact with the zeolite adsorbent;
- and desorbing the lactulose therefrom by contacting said adsorbent with a desorbing agent and removing the desorbed lactulose.
A process for separating lactulose from admixture with lactose by selective adsorption which comprises contacting a mixture comprising said compounds at a temperature of from 30.degree. C. to 100.degree. C. and at a pressure sufficient to maintain the system in the liquid phase with an adsorbent composition comprising at least one crystalline aluminosilicate zeolite of modified Type Y having a cation site concentration of from about 40 to about 10 equivalents per mole unit cell and a face-centered cubic unit cell having an a.sub.o for the decationized form of from 24.3 to 24.6 A in which the zeolite cations are more than 50% barium, whereby lactulose is selectively adsorbed thereon;
- removing the non-adsorbed portion of said mixture from contact with the zeolite adsorbent;
- and desorbing the lactulose therefrom by contacting said adsorbent with a desorbing agent and removing the desorbed lactulose.
Dependencies are inferred from the claim text.