Preparation device of lithium dihydrogen phosphate

Abstract

The invention discloses a device for preparing lithium dihydrogen phosphate, which can slow down the corrosion to a negative pressure evaporator. The device for preparing the lithium dihydrogen phosphate comprises the negative pressure evaporator and a heating circulation chamber, wherein a circulating pump is arranged between the heating circulation chamber and the negative pressure evaporator; the negative pressure evaporator, the circulating pump and the heating circulation chamber are connected together in sequence to form a circulation loop; and the heating circulation chamber is connected with a heating device. When the device works, solution of the lithium dihydrogen phosphate is circulated between the negative pressure evaporator and the heating circulation chamber so as to avoid an over-high temperature appearing on the inner wall of the negative pressure evaporator and greatly reduce the corrosion to the negative pressure evaporator; and simultaneously, in the circulation process, internal circulation spaces of the negative pressure evaporator and the heating circulation chamber can be used fully, so the device improves the heat exchange efficiency, is more favorable for the evaporation concentration of the solution of the lithium dihydrogen phosphate, can avoid product deposition caused after the concentration of the solution of the lithium dihydrogen phosphate, can make crystals uniform, and is suitable to be popularized and used in preparing various acidic chemical substances.

Description

technical field [0001] The invention discloses a device for preparing chemical substances, in particular to a device for preparing lithium dihydrogen phosphate. Background technique [0002] At present, the preparation of lithium dihydrogen phosphate is mainly obtained by reacting lithium hydroxide monohydrate with phosphoric acid, and after the lithium dihydrogen phosphate solution is obtained, it is evaporated and concentrated in an evaporation concentration device. The domestic and foreign studies on evaporative concentration devices mainly focus on two aspects: the corrosion resistance of the device and the control of temperature. In terms of corrosion, we mainly study new materials with higher corrosion resistance to phosphoric acid, and develop evaporating and concentrating devices such as enamel, stainless steel, and plastic; in terms of temperature, we mainly study the influence of temperature on the corrosion of phosphoric acid. Corrosion is more serious. Based on ...

AI Technical Summary

Problems solved by technology

The main problem that this method exists is: when the lithium dihydrogen phosphate solution is evaporated and concentrated, because the negative pressure evaporator is directly heated, the contact temperature between the inner wall of the negative pressure evaporator and the lithium dihydrogen phosphate solution is very high ( This temperature is greater than the liquid temperature in the negative pressure evaporator), which leads to serious corrosion of the negative pressure evaporator, and a set of negative pressure evaporators is scrapped after less than 3 months of use; in addition, in the negative pressure evaporator After the upper liquid in the cavity evaporates, the upper space cannot be effectively used to exchange heat for the lithium dihydrogen phosphate solution, so the production efficiency is low

Images