Device for preparing pure water for analytical laboratory by ion exchange method

Abstract

The invention discloses a device for preparing pure water for an analytical laboratory by an ion exchange method. A multistage multi-column exchange column is connected behind a multi-column system in series, so as to form a multi-column-multistage multi-column ion exchange pure water device; and cation exchange resin and anion exchange resin are alternately filled in a shorter exchange column according to a certain proportion, the two kinds of resin are separated by a sieve plate so as to form a multistage multi-column unit, and a plurality of multistage multi-column units are connected in series to from the multistage multi-column. Compared with a multi-column method, in the ion exchange method, as one multistage multi-column is connected in series, a plurality of times of exchange balance can be realized in the multi-column, and the water purity is increased; and compared with a mixing column, in the multi-column, the cation exchange resin and the anion exchange resin are separated by the sieve plate, the direct mixing of the two kinds of the resin can be avoided, and the regeneration is easy.

Description

technical field [0001] The invention belongs to pure water preparation equipment for analysis laboratories, and relates to a device for preparing pure water for analysis laboratories by an ion exchange method. Background technique [0002] Ion exchange method is one of the commonly used preparation methods for pure water used in analytical laboratories. The ion exchange pure water devices commonly used at present can be divided into three categories: one is the double column system, the cation and anion exchange columns are arranged alternately and used in series; The exchange column is filled later; the third is the compound column-mixed column system, that is, a mixed column is connected in series after the compound column system. [0003] The characteristics of compound column, mixed column and compound column-mixed column ion exchange pure water device are very obvious. For the compound column, the cation and anion ion exchange resins are not mixed, so the regenera...

AI Technical Summary

Problems solved by technology

For compound columns, the cation and anion ion exchange resins are not mixed, so the regeneration is easy, but the purity of the effluent is low. If the purity of the effluent is improved by increasing the number of columns connected in series, the flow resistance will be greatly increased; the mixed column is equivalent to the cation and anion exchange columns. Unlimited series connection has the advantage of high effluent purity, but the disadvantage is that resin regeneration is difficult, because the cation and anion exchange resins need to be separated during regeneration; the composite column-mixed column system can reduce resin separation in the mixed column compared with the mixed column and the number of regenerations, the disadvantage of difficult resin regeneration still exists

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