Apparatus for distilling phosphorus

Details Apparatus for distilling phosphorus Apparatus for distilling phosphorus

1984-06-01

1986-03-11

Bascomb, Wilbur

Distillation: apparatus

Apparatus

Systems

202159, 202161, 202187, 202198, 202205, 203 88, 203 91, 423322, B01D 314

Patent

active

045754039

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: 1504588 (1924-08-01), Tunison
patent: 1730892 (1929-10-01), Leslie
patent: 2224926 (1940-12-01), Potts et al.
patent: 2852446 (1958-09-01), Bromberg
patent: 2903401 (1959-09-01), Heere
patent: 3658655 (1972-04-01), Heere
patent: 3860491 (1975-01-01), Baird et al.
patent: 4033617 (1977-07-01), Cocuzza et al.
patent: 4390398 (1983-06-01), Coker et al.

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