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Process for softening a sugar-containing aquesous solution, such as sugar juice or molasses
| Details |
Inventors: Saska, Michael; Lancrenon, Xaivier;
Assignee: Board of Supervisors of Louisiana State University and Agricultural and (Baton Rouge, LA); Societe Nouvelle de Recherches et D'Applications Industrielles (Epone, FR)
Primary Examiner: Lieberman; Paul
Assistant Examiner: Hailey; Patricia
Attorney, Agent or Firm: Runnels; John H.
The invention relates to a process for softening an aqueous sugar juice containing sugars and Ca.sup.2+ and/or Mg.sup.2+ ions, such as a sugar factory molasses by means of a cation exchange resin, in the form of Na.sup.+ and/or K.sup.+, and for regeneration of said resin, comprising: (a) a softening step wherein the said sugar juice is brought into contact with the said cation exchange resin, in the form Na.sup.+ and/or K.sup.+, to give, on the one hand, a softened sugar juice depleted in Ca.sup.2+ and/or Mg.sup.2+ ions and charged with Na.sup.+ and/or K.sup.+ ions and, on the other hand, a cation exchange resin charged with Ca.sup.2+ and/or Mg.sup.2+ ions, and (b) a step for the regeneration of said latter resin, characterised in that the regeneration step (b) comprises bringing the said resin into contact with a liquid effluent produced on separation by chromatography of the sugars from a softened aqueous sugar juice containing sugars and Na.sup.+ and/or K.sup.+ ions, said liquid effluent containing the majority of the Na.sup.+ and/or K.sup.+ ions initially present in the softened sugar juice. |
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DETAILED DESCRIPTION We claim: 1.
A process comprising the steps of: (a) contacting an aqueous solution of sugar and calcium or magnesium divalent cations with an ion-exchange resin comprising sodium or potassium monovalent cations, until the concentration of sodium or potassium cations in said aqueous solution has been enriched in comparison to the initial concentration of sodium or potassium cations in said aqueous solution, and the concentration of calcium or magnesium cations in said aqueous solution has been depleted in comparison to the initial concentration of calcium or magnesium cations in said aqueous solution; (b) separating the sodium-or-potassium-cation-enriched solution into two fractions: a first fraction comprising a major portion of the sugar from the sodium-or-potassium-cation-enriched solution, and a second, raffinate fraction comprising an aqueous effluent containing concentrated sodium or potassium cations from the sodium-or-potassium-cation-enriched solution; and (c) regenerating the ion-exchange resin by contacting the resin with the effluent until a major portion of the calcium or magnesium cations in the resin have been replaced by potassium or sodium cations.
2.
A process as recited in claim 1, wherein the aqueous solution comprises sugar juice.
3.
A process as recited in claim 1, wherein the aqueous solution comprises molasses.
4.
A process as recited in claim 1, wherein the effluent is concentrated prior to regenerating the ion-exchange resin.
5.
A process as recited in claim 1, wherein sodium or potassium monovalent cations are added to the effluent prior to regenerating the ion-exchange resin.
6.
A process as recited in claim 1, wherein the ion-exchange resin comprises a strong acid cation exchange resin in sodium or potassium form; and wherein said separating step is performed with a strong acid cation exchange resin in sodium or potassium form, and with elution with water.
7.
A process as recited in claim 1, wherein said separating step comprises a chromatographic separation
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