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Production method of ammonium iodide

A production method and ammonium iodide technology, applied in the direction of ammonium halide and the like, can solve the problems of reducing product yield, reducing production efficiency, increasing production cost, etc., and achieving the effects of increasing heating temperature, increasing heating temperature, and increasing speed

Inactive Publication Date: 2011-07-27
TIANJIN KERMEL CHEM REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of the above method is: since the process adopts decompression heating and concentration, decompression equipment needs to be equipped and the heating temperature should not be too high, so the production efficiency has been reduced and the production cost has been increased; in addition, since the ammonium iodide crystal is soluble in anhydrous Ethanol, when washing with absolute ethanol, a large amount of ammonium iodide finished product will be lost, which reduces the product yield

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0024] Get 10kg content and be 45% hydroiodic acid (its volume is about 6700ml) under agitation, add content and be 25% ammoniacal liquor, adding speed should not be too fast, prevents splashing when reacting violently. Know according to calculation, should add ammoniacal liquor 5kg (its volume is about 5400ml), when approaching the end of reaction, will control adding rate, add dropwise, adjust the pH value of ammonium iodide solution, make solution pH=7, stop adding ammonia. Then, the ammonium iodide solution was evaporated and concentrated by heating. When the solution was concentrated until a crystal film appeared, the heating was stopped, the temperature of the solution was lowered to 70° C., and hydrazine hydrate with a content of 40% was added dropwise. After measuring and calculating, 10kg content is that hydriodic acid of 45% should produce ammonium iodide about 5kg in theory,,, be 0.1%~0.3% to calculate by the content of free iodine in the ammonium iodide product, th...

Embodiment 2

[0026] Get 10kg content and be 45% hydroiodic acid (its volume is about 6700ml) under agitation, add content and be 25% ammoniacal liquor, adding speed should not be too fast, prevents splashing when reacting violently. Know according to calculation, should add ammoniacal liquor 5kg (its volume is about 5400ml), when approaching the end of reaction, will control adding rate, add dropwise, adjust the pH value of ammonium iodide solution, make solution pH=8, stop adding ammonia. Then, the ammonium iodide solution was evaporated and concentrated by heating. When the solution was concentrated until a crystal film appeared, the heating was stopped, the temperature of the solution was lowered to 60° C., and hydrazine hydrate with a content of 40% was added dropwise. After measuring and calculating, 10kg content is that hydriodic acid of 45% should produce ammonium iodide about 5kg in theory,,, be 0.1%~0.3% to calculate by the content of free iodine in the ammonium iodide product, th...

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Abstract

The invention discloses a production method of ammonium iodide, comprising the following steps of: (1) reacting hydroiodic acid with ammonia water to generate an ammonium iodide solution; (2) heating to concentrate the ammonium iodide solution generated from the step (1) under an ordinary pressure, and stopping heating when concentrating till crystals are to appear; (3) dripping a hydrazine hydrate solution to the ammonium iodide solution so that the ammonium iodide solution is changed from orange red to white; (4) continuously heating to concentrate till white ammonium iodide crystals appear; and (5) filtering the crystals, and drying at a low temperature. According to the production method disclosed by the invention, direct heating and concentration are carried out under the ordinary pressure, the hydrazine hydrate reacts with precipitated free iodine to generate the ammonium iodide, therefore, not only is the production efficiency improved, but also the yield rate of products is enhanced.

Description

technical field [0001] The invention relates to the field of manufacturing inorganic chemical products, in particular to a method for producing ammonium iodide. Background technique [0002] The production method of existing ammonium iodide is: by hydroiodic acid (content ≥ 45% (wt%)) and ammoniacal liquor (content ≥ 25% (wt%)) reaction, generates ammonium iodide solution, then decompression heating and concentrating , the vacuum concentration equipment used is a distillation bottle, an electric heating mantle, a vacuum pump, etc. The temperature of the electric heating mantle is controlled at about 200°C, and the vacuum degree is at 600-660mmHg (80-88Kpa). Due to the decompression, the water can be evaporated at about 90°C and concentrated until crystallization occurs. The ammonium iodide finished product should be white crystals, and due to the free iodine after concentration, the ammonium iodide crystals will appear orange-yellow or even orange-red. Suction filter the c...

Claims

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Application Information

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IPC IPC(8): C01C1/16
Inventor 闫大洋
Owner TIANJIN KERMEL CHEM REAGENT
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