Process for the purification of phosphorus pentasulphide by distillation under vacuum
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United States of America Patent
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Feb 22, 1983
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N/A
app pub date -
Mar 2, 1981
filing date -
May 20, 1977
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Expired
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Abstract
Process for the purification of phosphorus pentasulphide by means of distillation under vacuum at a residual pressure of about 6 mmHg and carried out according to a 'thermal profile' comprising, immediately before and immediately after the liquid-vapor-liquid double passage of state, two stationary stages wherein said pentasulphide is maintained in the liquid state at a temperature very close to the boiling temperature of the pentasulphide itself.
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