Ion exchange and recrystallization combined preparation apparatus and method for high-purity boric acid

Abstract

The invention discloses a device and a method for preparing a high-purity boronic acid by means of ion exchange and recrystallization. The device comprises an ion exchange column and a cooling groove, wherein the ion exchange column comprises an inner cavity and a heating device; and cation exchange resin particles are placed into the inner cavity. The method is as follows: a boronic acid solution is added into the ion exchange column and metallic ions in the boronic acid solution are removed; and the boronic acid solution after ion exchange is cooled through the cooling groove and purified by means of recrystallization. The metallic ions in the boronic acid solution are removed by utilizing the strongly acidic cation exchange resin and the boronic acid and is purified through the cooling groove by means of the recrystallization, so that the device has a simple structure; the method is convenient to operate; purification and quantitative control are convenient; and the boronic acid is purified to have a high purity of more than 99.9999 percent by a guaranteed reagent.

Description

technical field [0001] The invention relates to a preparation device and method of boric acid, in particular to a combined preparation device and method of ion exchange and recrystallization of high-purity boric acid. Background technique [0002] The purification of boric acid mainly contains two kinds of technological methods in the prior art. One method is the recrystallization method. When a substance is partially solidified from a liquid state to a solid state, due to the different solubility of impurities in its liquid state and solid state, the concentration of impurities in the solid state is often lower than that in the liquid state. The phenomenon is segregation. This phenomenon can be used to purify substances. But because the solubility of boric acid is not high, the dissolution curve is not steep enough, the efficiency of recrystallization method is very low, the purification effect is not ideal, and the single purification efficiency is not high, and multiple...

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Problems solved by technology

This method uses a certain amount of platinum material as an electrode, and also requires a certain permeable membrane. The price of these materials is relatively expensive, and the production cost is relatively high.

At the same time, because the ionization degree of boric acid in water is low, the concentration of borate ions is small, the electrolytic efficiency is very low, and the time required for electrolytic purification is long; when the content of metal impurities is very low, the electrode voltage must be greatly increased, which will cause the precipitation of hydrogen. , can not play the role of depositing metal impurities

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