Production of red phosphorus
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United States of America Patent
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Dec 24, 1991
Issued Date -
N/A
app pub date -
Nov 19, 1990
filing date -
Dec 8, 1986
priority date (Note) -
Expired
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Abstract
Amorphous red phosphorus useful for matches, or as flame retardant is made by forming a slurry of 10-45% red phosphorus in molten white phosphorus, reducing the content of yellow phosphorus to less than 20% of the red phosphorus by separation at less than 280.degree. C., and then heating the product at above 295.degree. C. to convert, and preferably also evaporate, the white phosphorus.
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