Conductionmetric resin separation |
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| 申请号 | EP84105261 | 申请日 | 1984-05-09 | 公开(公告)号 | EP0128363A3 | 公开(公告)日 | 1986-11-20 |
| 申请人 | ECODYNE CORPORATION; | 发明人 | Salem, Eli; | ||||
| 摘要 | A method for separating resins of an exhausted, mixed bed resin. The exhausted, mixed bed resin includes (a) an exhausted cation exchange resin having a first density and a first conductance value when suspended in the classifying fluid at a first concentration; (b) inert particulate material having a second density that is less than the first density and having a second conductance value when suspended in the classifying fluid that is at most about 30 percent at the conductance of the cation exchange resin when measured in the classifying fluid at the first concentration; and an exhausted anion exchange resin having a third density that is less than the second density and also having a third conductance value that is greater than the second conductance value when the exhausted anion exchange resin is suspended in classifying fluid and measured at the first concentration. The mixed resin bed is classified with the classifying fluid in a container to form a vertical column of resin such that the cation exchange resin forms a bottom layer, the inert resin forms an intermediate layer and the anion exchange resin forms a top layer. The slurry is passed out of the bottom of the container while the classification is maintained. The conductance value of the passing slurry is measured, and after the conductance value has become substantially constant, the conductance value is stored to determine an initial conductance value. Subsequent conductance values of the passing slurry are also measured and those subsequent conductance values are compared to the initial conductance value. The passage of the slurry out of the container is terminated when the first subsequently measured conductance value is at most about 30 percent of the initial conductance value. A second embodiment of the invention utilizes only cation and anion exchange resin. The method steps are substantially the same as recited with the embodiment utilizing the inert resin, except that the slurry passage is terminated when the first subsequently measured conductance value is at most about 55 percent of the initial cation exchange resin conductance. | ||||||
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