Process for phosphorus purification

Details Process for phosphorus purification Process for phosphorus purification

1982-06-04

1984-11-20

Sever, Frank

Distillation: processes, separatory

Vaporization zone under positive pressure or vacuum

203 99, 203100, 423322, B01D 310

Patent

active

044837461

ABSTRACT:
A continuous process for reducing the arsenic content of phosphorus is described in which the impure phosphorus is continually passed through a heat exchanger and heated to vaporize a portion of the phosphorus at a temperature not above 200.degree. C., separating the vaporized phosphorus in a disengaging zone under subatmospheric pressure and introducing it into a fractionating zone under subatmospheric pressure, fractionating the phosphorus from the less volatile arsenic, condensing under subatmospheric pressure low-arsenic phosphorus rising from the fractionating zone, returning a portion of the low-arsenic phosphorus condensate as reflux to the column, removing high-arsenic liquid phosphorus as bottoms from the fractionating zone, and recovering the remaining portion of low-arsenic phosphorus condensate as product.

REFERENCES:
patent: 3053637 (1962-09-01), Williams
patent: 3401096 (1968-09-01), Wondrak
patent: 3433601 (1969-03-01), Stevens
patent: 3563707 (1971-02-01), Krahl et al.
patent: 4081333 (1978-03-01), Holmes et al.

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