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Preparation method of lithium hypochlorite

A technology of lithium hypochlorite and hypochlorous acid solution, applied in the directions of hypochlorous acid, hypochlorite, chemical instruments and methods, etc., can solve the problems of difficulty in obtaining high-concentration and high-purity lithium hypochlorite, etc. Product purity and yield, the effect of reducing production costs and simplifying production processes

Inactive Publication Date: 2018-09-21
FIRST RARE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But prepare lithium hypochlorite with this method, then be difficult to obtain the lithium hypochlorite of high concentration, high purity

Method used

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Examples

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Effect test

preparation example Construction

[0024] The invention provides a kind of preparation method of lithium hypochlorite, it comprises the steps:

[0025] S1. Passing chlorine gas into the alkali metal hydroxide solution to react to prepare the first solution, the molar ratio of chlorine gas to alkali metal hydroxide is not less than 20:1;

[0026] S2. Distilling the first solution; condensing the distillate at a temperature of -5 to 10°C to obtain a hypochlorous acid solution with a mass concentration of hypochlorous acid not lower than 35wt%;

[0027] S3, mixing and reacting the prepared hypochlorous acid solution and the prepared lithium hydroxide suspension at 0-20° C. to obtain a lithium hypochlorite mixed solution;

[0028] S4. Evaporate and crystallize the lithium hypochlorite mixed solution in a vacuum at 30-60° C.; separate the lithium hypochlorite crystals from the mother liquor; dry the lithium hypochlorite crystals to obtain lithium hypochlorite. The mother liquor obtained in S4 can be recycled to S1 ...

Embodiment 1

[0039] Adopt hypochlorous acid generator, pass 14200g chlorine into 1000g mass concentration according to the ratio of chlorine and sodium hydroxide molar ratio 20:1 and fully react in the sodium hydroxide solution of 40wt% to form the first solution, the first solution is heated to Distill at 100°C to obtain a gas mixture, and cool the gas mixture at 0°C to obtain a 40wt% hypochlorous acid solution.

[0040] Weigh 79g LiOH·H 2 O is placed in 146g water, is configured into 225g 20wt% lithium hydroxide suspension, and the control reaction temperature is 10 ℃, and the hypochlorous acid solution of 40wt% is slowly added in the lithium hydroxide suspension until lithium hydroxide dissolves completely, The molar ratio of lithium hydroxide and hypochlorous acid is 1:1 to form lithium hypochlorite solution. After the lithium hypochlorite solution was vacuum evaporated at 50°C to a water content of 50%, the solution was filtered and separated using a Buchner funnel, and the mother li...

Embodiment 2

[0042] Adopt hypochlorous acid generator, pass 47925g chlorine gas into 2000g mass concentration according to the ratio of chlorine gas and sodium hydroxide molar ratio 30:1 and fully react in the sodium hydroxide solution of 45wt% to form the first solution, the first solution is heated to Distill at 100°C to obtain a gas mixture, and cool the gas mixture at -3°C to obtain a 49.2wt% hypochlorous acid solution.

[0043] Weigh 263g LiOH·H 2 O is placed in 236.7g of water, configured into 499.7g of 30wt% lithium hydroxide suspension, the controlled reaction temperature is 5°C, and 49.2wt% of hypochlorous acid solution is slowly added to the lithium hydroxide suspension until the lithium hydroxide Completely dissolved, the molar ratio of lithium hydroxide and hypochlorous acid is 1:1, forming a lithium hypochlorite solution. After the lithium hypochlorite solution was vacuum evaporated at 45°C to a water content of 50%, the solution was filtered and separated using a Buchner fun...

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PUM

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Abstract

The invention relates to a preparation method of lithium hypochlorite. The preparation method of lithium hypochlorite includes the following steps: S1, chlorine is introduced into alkali metal hydroxide solution to react to form a first solution, wherein the molar ratio of chlorine to alkali metal hydroxide is not less than 20:1; S2, the first solution is distilled; the distillate is condensed atthe temperature of between -5 and 10 DEG C to obtain hypochlorous acid solution with the concentration of hypochlorous acid not less than 35wt%; S3, the prepared hypochlorous acid solution is mixed with the prepared lithium hydroxide suspension at the temperature of between 0 and 20 DEG C to react to obtain a lithium hypochlorite mixed solution; S4, the lithium hypochlorite mixed solution is evaporated and crystallized under the vacuum state and at the temperature of between 30 and 60 DEG C; the lithium hypochlorite crystal and the mother liquid are separated; the lithium hypochlorite crystalis dried to obtain the lithium hypochlorite. By the method, the concentration of various impurities can be reduced to a maximum extent, the purity and the yield of the product are improved, the production cost is reduced, the production process is simplified, and the method is an environment-friendly and economical preparation method of lithium hypochlorite.

Description

technical field [0001] The invention relates to the field of inorganic chemistry, in particular to a preparation method of lithium hypochlorite. Background technique [0002] Lithium hypochlorite has two common forms, liquid and solid. Lithium hypochlorite in liquid state is light yellow and transparent, with a slight chlorine smell and poor chemical stability, which is not conducive to storage and transportation; solid lithium hypochlorite is a dry, loose White powder, slightly chlorine smell, relatively stable chemical properties at normal temperature, easy to decompose when heated, easily soluble in water, clear solution, strong oxidation and bactericidal ability, superior to other inorganic hypochlorite and organic compounds. [0003] Lithium hypochlorite is a promising oxidizing agent, corrosive agent and disinfectant. Low-purity lithium hypochlorite can be widely used in industries such as textiles, papermaking, and semiconductor polishing and corrosion. It can also be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B11/06
CPCC01B11/062C01P2006/80
Inventor 王艳朱刘陈辉
Owner FIRST RARE MATERIALS CO LTD
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