Preparation method of high-purity selenium sulfide

Abstract

The invention discloses a preparation method of high-purity selenium sulfide. The method is characterized by comprising the following steps that 1, raw material selenium is dissolved into a nitric acid solution; 2, splenic acid obtained after the reaction in the solution is separated by crystallization; 3, splenic acid crystals are dissolved into water and filtered to obtain a saturation solution;4, the saturation solution is stirred, an ammonium sulfide solution and a glacial acetic acid solution are added into the saturation solution, or an ammonia hydrogen sulfide solution and a glacial acetic acid solution are added; 5, absolute ethyl alcohol or absolute methanol is added into the mixed solution obtained in step 4, and then, stirring continues to be performed; after stirring, standingand aging are performed; 6, filtering is performed, ethyl alcohol is used for repeatedly washing filtrates; after washing, drying is performed. The purity of selenium sulfide finally prepared throughthe technology reaches up to 99.99%, and the requirement for high purity is met.

Description

Technical field [0001] The invention relates to an industrial preparation method for preparing high-purity selenium disulfide. Background technique [0002] Selenium disulfide has a molecular formula of SeS2, a molecular weight of 143.09, a melting point of 111°C, and a boiling point of 118-119°C. It is an orange-yellow or orange-brown powder with a slight smell of hydrogen sulfide, and it is almost insoluble in water and organic solvents. Selenium disulfide has excellent anti-seborrhea effect and anti-fungal effect. It has a good effect on various diseases such as seborrheic dermatitis and tinea versicolor. It also has good effects on patients with dandruff. It is currently widely used in various washes. Among the supplies. [0003] There are two main methods for preparing 4N selenium disulfide on the market. [0004] One is fire synthesis: [0005] Add selenium and sulfur in the closed quartz tube according to the proportion, and synthesize at high temperature. The disadvantages ...

AI Technical Summary

Problems solved by technology

[0006] 1. Before sealing the tube, professional glass workers are required to vacuum the quartz tube to a negative pressure of 10-5Pa and then burn it, which requires high equipment and personnel

[0007] 2. Due to the extremely high saturated vapor pressure of sulfur and selenium, the pressure inside the quartz tube will rise sharply during high-temperature synthesis, which is very prone to explosion. Only 5-10g of materials can be loaded into a quartz tube

[0008] 3. The small amount of charge leads to a sharp increase in production cost, and the cost of producing one kilogram of high-purity 4N selenium disulfide finished product is as high as 10,000 yuan or more

[0011] Its disadvantage is that the purity of selenium disulfide reaches about 95%, which cannot meet the high-purity requirements

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