Selenium synthesis

9synthesis methods

Product Name:Selenium
CAS Number:7782-49-2
Molecular formula:Se
Molecular Weight:78.96

Selenium (Se), a nonmetallic element of the sulfur group, is widely distributed in nature. It is obtained along with tellurium as a by-product of metal ore refining, chiefly from copper deposits. About 16 ton is mined a year globally. The global refinery production of selenium, excluding the U.S. production, increased from about 1,400 metric ton in 2000 to about 1510 metric ton in 2008 and 1500 in 2009.
Because selenium is present in fossil fuels, up to 90% of the selenium content in ambient air is emitted during their combustion. Air pollution concentrations averaged from 0.38 ng/m³ in remote areas to 13 ng/m³ in urban areas. The mass medium particle diameter was 0.92 mm. The worldwide emissions of 10,000 tons/year from natural sources exceed the atmospheric emissions from anthropogenic sources (5100 ton). However, 41,000 tons is emitted into the aquatic ecosystems. The largest contributors are electric power generating plants that produce 18,000 ton; manufacturing processes account for 12,000 ton.
Most of the world’s selenium today is provided by recovery from anode muds of electrolytic copper refineries. Selenium is recovered by roasting these muds with soda or sulfuric acid or by melting them with a soda and niter.

22216-66-6
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7782-49-2
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$27.00/25g

38762-70-8
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100-66-3 Synthesis

100-66-3
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Yield:100-66-3 41.3 %Chromat. ，38762-70-8 34 %Chromat. ，7782-49-2 22%

Reaction Conditions:

with hydrogen iodide in chloroform;water at 60; for 6 h;

Steps:

Acidolysis of compound (2).

To a solution of 0.29 g (1 mmol) of compound 2 in 5 mL of CHCl3 was added at stirring 3 mL of HI (54% water solution), themixture was heated at 60°C and kept for 6 h. Chloroform solution was separated from water layer and filtered. We isolated 17 mg (22%) of selenium. According to GC-MS data the chloroform solutioncontained anisole (41.3%), initial compound 2(21.4%), and bis(4-methoxyphenyl) diselenide (34%).

References:

Balina;Russkikh;Orlova;Ogneva;Shelkovnikov [Russian Journal of Organic Chemistry,2015,vol. 51,# 2,p. 198 - 201][Zh. Org. Khim.,2015,vol. 51,# 2,p. 210 - 213,4]