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A kind of preparation method of infrared spectrum grade potassium bromide

A technology of potassium bromide and infrared light, which is applied in the field of preparation of infrared spectrum-grade potassium bromide, can solve the problems of increased production cost, high energy consumption, complicated process, etc., and achieve the effect of low production cost and easy operation

Active Publication Date: 2019-05-17
阿拉丁试剂(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the introduction of ethylenediaminetetraacetic acid (EDTA) makes the process complicated, which not only increases the production cost, but also roasts at a high temperature of 700°C, which consumes a lot of energy and is not suitable for large-scale production.

Method used

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  • A kind of preparation method of infrared spectrum grade potassium bromide

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Comparison scheme
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Embodiment

[0022] A kind of preparation method of infrared spectrum grade potassium bromide:

[0023] The first step: under room temperature condition, 500g of potassium bromide raw material of purity 99% is dropped into acetone solution (deionized water: acetone mass ratio is the solution that 1: 20 prepares), the mass ratio of acetone solution and potassium bromide raw material 3:1, ultrasonic irradiation and vibration for 6h, temperature controlled at 20-60°C, vacuum filtration, and dry filter cake;

[0024] The second step: Put the filter cake obtained in the first step into 500mL deionized water, heat the electric heating mantle to 90°C, stir and mix evenly, continue to stir for 30 minutes and then perform hot filtration;

[0025] The third step: Slowly add the filtrate obtained in the second step into 100 mL of tetrahydrofuran in batches, and continue to stir the obtained mixture for 60 minutes, then let it stand at room temperature, and further freeze and crystallize, and keep war...

Embodiment 2

[0028] A kind of preparation method of infrared spectrum grade potassium bromide:

[0029] The first step: under room temperature condition, 1500g of potassium bromide raw material of purity 99% is dropped into acetone solution (deionized water: acetone mass ratio is the solution that 1: 10 prepares), the mass ratio of acetone solution and potassium bromide raw material 5:1, ultrasonic irradiation and vibration for 8h, temperature controlled at 20-60°C, vacuum filtration, and dry filter cake;

[0030] The second step: put the filter cake obtained in the first step into 2250mL deionized water, heat the electric heating mantle to 100°C, stir and mix evenly, continue to stir for 60 minutes and then carry out hot filtration;

[0031] The third step: Slowly add the filtrate obtained in the second step into 1200mL tetrahydrofuran in batches, and continue to stir the obtained mixture for 30 minutes, then let it stand at room temperature, and further freeze and crystallize, and keep w...

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Abstract

The invention provides a preparation method of infrared spectrum grade potassium bromide. The preparation method is characterized by comprising steps as follows: raw materials of potassium bromide are fed into an organic solvent and are subjected to ultrasonic irradiation and oscillation for 6-8 h and reduced-pressure suction filtration, and a filter cake is dried by pressing; the filter cake is fed into deionized water and is stirred and mixed uniformly, and a mixed solution is filtered; a filtrate is slowly added to a refining agent in batches for further freezing crystallization; after a solid-liquid mixture is subjected to reduced-pressure filtering and separation, crystals are washed with the refining agent, a filter cake is dried by pressing and subjected to vacuum drying, and infrared spectrum grade potassium bromide is obtained and encapsulated under the protection of nitrogen. By means of deep purification and refined purification of potassium bromide with common specifications, impurities with high infrared absorption in the raw materials are effectively removed, and the preparation method is simple and convenient to operate, low in production cost and suitable for large-scale production and is not involved in a chemical reaction process, thereby being a green method for preparing infrared spectrum grade potassium bromide.

Description

technical field [0001] The invention relates to a preparation method of a spectroscopic-grade special reagent, in particular to a preparation method of infrared spectroscopic-grade potassium bromide. Background technique [0002] Potassium bromide is colorless crystal or white powder, has a strong salty taste, turns yellow when exposed to light, and has certain hygroscopicity. Potassium bromide is widely used in medicine and daily chemical industry. It is used as a nerve sedative in medicine. It is used as a lithographic ink and special soap filler in the daily chemical industry. It is used in the production of photosensitive film, developer, and film thickening in the photosensitive material industry. Toner, toner and color photo bleach, etc. An important application of potassium bromide in the field of modern analytical science is as a test carrier for infrared spectroscopy samples. Potassium bromide pressing is the most important method for preparing solid infrared sampl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/18C01D3/14C01D3/10
CPCC01D3/10C01D3/14C01D3/18C01P2002/82C01P2006/80
Inventor 程俊朱洋凌青
Owner 阿拉丁试剂(上海)有限公司