Abstract:
A purification method employs nanofiltration of an aqueous solution containing one or several sugars, multivalent cations, monovalent metal cations, monovalent anions and multivalent inorganic anions and/or organic acid anions. The method includes replacement of at least a part of said multivalent cations and/or said multivalent inorganic anions and organic acid anions respectively by monovalent metal cations and/or monovalent anions to produce a solution. Nanofiltration of the solution is carried out to obtain a retentate, and at least part of the retentate is subject to crystallization.
Abstract:
A method is provided for decalcification of an aqueous solution that has multivalent Ca2+ and Mg2+ cations and anions able to form complexes with at least a part of the multivalent cations. The method includes replacing at least part of the anions to form complexes of the aqueous solution by monovalent anions such as Cl−, non-able to form such complexes. The method also replaces at least a part of the multivalent cations of the aqueous solution by monovalent metal cations such as Na+ and/or K+ This later replacement step is performed simultaneously with or after the first replacement step.
Abstract:
A method is provided for producing lactose from whey or a permeate resulting from the ultrafiltration of whey. The method includes replacing at least part of the multivalent cations of the whey or permeate by monovalent metal cations to obtain a whey or permeate depleted of multivalent cations. The method then replaces at least part of the multivalent inorganic anions and organic acid anions of the whey or permeate, by monovalent anions non-able to form complexes with the multivalent cations, this latter replacement step is carried out before or simultaneously with the replacement of at least part of the multivalent cations of the whey or permeate. The method then crystallizes the whey or permeate resulting from the replacement steps to obtain crystallized lactose and a mother liquor enriched in monovalent metal cations.
Abstract:
This invention relates to a process for the manufacture of crystal sugar from an aqueous sugar juice containing sugars and organic and mineral impurities, including Ca.sup.2+ and/or Mg.sup.2+ ions, such as a sugar cane or sugar beet juice, comprising the following operations:(a) concentration of said sugar juice to give a syrup, and(b) crystallization of said syrup to give a crystal sugar and a molasses,characterized in that it also comprises an operation:(c) of tangential microfiltration, tangential ultrafiltration or tangential nanofiltration, this operation being effected before operation (a).It also relates to a process for the production of crystal white sugar from a sugar juice of the sugar cane juice type, comprising the above-mentioned process for the production of crystal sugar, completed by re-melt, decolorization and crystallization operations.
Abstract:
A process for refining a raw sugar, particularly raw sugar from the sugar cane sugar industry, characterized in that it comprises the steps of:(a) remelting of the raw sugar for obtaining a raw sugar syrup,(b) carbonatation or phosphatation of said raw sugar syrup, and(c) tangential microfiltration and/or tangential ultrafiltration of the raw sugar syrup, which has been subjected to carbonatation or phosphatation.The process is completed by the steps of:(d) decolorization of the sugar syrup resulting from step (c), and(e) crystallization and/or demineralization of the sugar syrup resulting from step (d).
Abstract:
A purification method employs nanofiltration of an aqueous solution containing one or several sugars, multivalent cations, monovalent metal cations, monovalent anions and multivalent inorganic anions and/or organic acid anions. The method includes replacement of at least a part of said multivalent cations and/or said multivalent inorganic anions and organic acid anions respectively by monovalent metal cations and/or monovalent anions to produce a solution. Nanofiltration of the solution is carried out to obtain a retentate, and at least part of the retentate is subject to crystallization.
Abstract:
Process for manufacturing crystallized sugar from an aqueous sugar solution containing colorants, polyvalent cations such as Ca2+ and Mg2+ ions and possibly polyvalent anions, said process comprising the step of submitting said solution to a crystallization procedure to obtain a crystallized sugar, the process being characterized in that, in order to decrease the occlusion of colorants in the crystals of said crystallized sugar, it further comprises the step of treating said solution so as to increase the number of polyvalent anion equivalents such as adding COB− anions with regard to the number of polyvalent cation equivalents in said solution.
Abstract:
This invention relates to a process for the manufacture of crystal sugar from an aqueous sugar juice containing sugars and organic and mineral impurities, including Ca.sup.2+ and/or Mg.sup.2+ ions, such as a sugar cane or sugar beet juice, comprising the following operations:(a) concentration of said sugar juice to give a syrup, and(b) crystallization of said syrup to give a crystal sugar and a molasses,characterized in that it also comprises an operation:(c) of tangential microfiltration, tangential ultrafiltration or tangential nanofiltration, this operation being effected before operation (a).It also relates to a process for the production of crystal white sugar from a sugar juice of the sugar cane juice type, comprising the above-mentioned process for the production of crystal sugar, completed by re-melt, decolorization and crystallization operations.