Chromatographic separation using ion-exchange resins
First Claim
1. A process for the chromatographic separation of a fluid mixture which contains at least a first component and a second component into a recoverable stream rich in said first component and another recoverable stream rich in said second component, wherein at least one of said first and second components is a saccharide, comprising(a) contacting said fluid mixture with a bed of an ion-exchange resin exhibiting an apparent cross-link density of at least about 1.1 times the actual cross-link density and having a water retention capacity, on a fully functionalized basis, of at least about 40 percent, said ion-exchange resin being prepared by functionalizing a gel-type copolymer, the gel-type copolymer being prepared in a multi-stage polymerization process employing seed copolymer particles,(b) eluting said fluid mixture such that the fluid mixture passes through said resin bed under conditions such that the rate of passage of said first component through the resin bed is retarded relative to the rate of passage of said second component, and(c) recovering a product stream rich in said first component and another product stream rich in said second component, the first component being recovered at a percent yield which is at least about 20% greater than the percent yield obtained when an ion-exchange resin made from a single step process having an equivalent average particle size and water retention capacity is employed in an otherwise similar process.
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Abstract
This invention is a process for the chromatographic separation of a fluid mixture in which the mixture is contacted with an ion-exchange resin, eluted through the resin under conditions such that the rate of passage of one component of the mixture through the resin bed is retarded relative to the rate of passage of a second component of the mixture, and a first product stream rich in said first component and a second product stream rich in said second component are recovered. The invention involves the use of an ion-exchange resin made from a copolymer which is prepared in a multi-stage polymerization process. The use of this resin is found to provide fast separation kinetics and increases the overall speed and efficiency of the separation. This invention is particularly suited for fructose/glucose separations in the preparation of high fructose corn syrup.
114 Citations
26 Claims
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1. A process for the chromatographic separation of a fluid mixture which contains at least a first component and a second component into a recoverable stream rich in said first component and another recoverable stream rich in said second component, wherein at least one of said first and second components is a saccharide, comprising
(a) contacting said fluid mixture with a bed of an ion-exchange resin exhibiting an apparent cross-link density of at least about 1.1 times the actual cross-link density and having a water retention capacity, on a fully functionalized basis, of at least about 40 percent, said ion-exchange resin being prepared by functionalizing a gel-type copolymer, the gel-type copolymer being prepared in a multi-stage polymerization process employing seed copolymer particles, (b) eluting said fluid mixture such that the fluid mixture passes through said resin bed under conditions such that the rate of passage of said first component through the resin bed is retarded relative to the rate of passage of said second component, and (c) recovering a product stream rich in said first component and another product stream rich in said second component, the first component being recovered at a percent yield which is at least about 20% greater than the percent yield obtained when an ion-exchange resin made from a single step process having an equivalent average particle size and water retention capacity is employed in an otherwise similar process.
- 18. In a process for the chromatographic separation of a fluid mixture, wherein said mixture is passed through an ion-exchange resin bed under conditions such that the rate of passage of a first component of said mixture is retarded relative to the rate of passage of at least a second component of said mixture, wherein at least one of said first and second components is a saccharide, the improvement comprising employing an ion-exchange resin which is characterized in that it is prepared by a multi-step polymerization process wherein seed copolymer particles are prepared from a monomer mixture containing about 0.05 to less than about 5 weight percent of a cross-linking monomer, the ion-exchange resin exhibiting an apparent cross-link density of at least about 1.1 times the actual cross-link level and a water retention capacity, on a fully functionalized basis, of at least about 40 percent, the first component capable of being recovered at a percent yield which is at least 20% greater than the percent yield obtained when an ion-exchange resin made from a single step process having an equivalent average particle size and water retention capacity is employed in an otherwise similar process.
Specification