Method for curtailing phosphorous impurity in the production of

Details Method for curtailing phosphorous impurity in the production of Method for curtailing phosphorous impurity in the production of

1981-12-17

1983-07-19

Thomas, Earl C.

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

423484, 423488, C01B 722

Patent

active

043943659

ABSTRACT:
In the generation of hydrogen fluoride gas for the production of AlF.sub.3 by the reaction of fluorspar with concentrated sulphuric acid a small amount of aluminium sulphate is introduced into the reactive mix to assist in the retention of phosphorous compounds in the solid residues of the reaction and thus reduce the phosphorous content of the gaseous HF. Aluminium sulphate may be added as alum or may be generated in situ in the sulphuric acid by addition of an alumina hydrate, preferably before the acid is brought into contact with fluorspar. The addition of a small amount of calcium carbonate to the fluorspar also improves retention of phosphorous compounds in the solid residues in some instances.

REFERENCES:
patent: 3167391 (1965-01-01), Swinehart
patent: 3870786 (1975-03-01), Kidde
patent: 4078047 (1978-03-01), Spreckelmeyer

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