Separation of anion and cation exchange resins in a mixed resin bed
AssigneeThe Dow Chemical Company
InventorsLeonard J. Lefevre, Tetsuo Sato
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Abstract
A mixture of anion and cation exchange resins is separated into their respective resin types by classifying the resin mixture, using a fluid such as water, in the presence of a solid, inert material (e.g., copolymer beads of styrene, divinylbenzene and methyl methacrylate) which, upon classification, forms a layer intermediate between the layers of the anion and cation resins. The degree of resin separation and the location of the layers of the classified anion resin and cation resin are determined by measuring a conductivity property of the resulting classified resin bed.
Claims14
A method for separating a resin bed of a mixture of anion and cation exchange resins comprising the steps of:
- (a) classifying the mixture of the cation and anion resins using a classifying fluid in the presence of a solid, inert material which (1) imparts measurably different conductivity properties to the classifying fluid than the cation and anion exchange resin and (2) has fluidization characteristics such that, upon classification, it forms an intermediate layer positioned between the layer of anion resin and layer of cation resin and
- (b) measuring a conductivity property of the resin bed within the conductivity property varies with the degree of separation of the anion and cation resins and the position of the solid, inert material.
Dependencies are inferred from the claim text.