Process for purifying crude phosphoric acid

Details Process for purifying crude phosphoric acid Process for purifying crude phosphoric acid

1978-03-24

1980-11-11

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423321R, 423 8, C01B 2522

Patent

active

042332788

ABSTRACT:
Aqueous phosphoric acid, e.g., a slurry of the acid produced by the "wet" process, is contacted with steam under organic volatile-removing conditions to remove volatile organic material. A "wet process" aspect of the process involves contacting crude phosphoric acid produced by the wet process at a temperature, preferably not greater than 100.degree. C., while binding bindable solid impurities present and controlling the density of the acid to avoid deleterously affecting the processing character of the acid. In a first facet of this aspect, humic-extracting extractants are employed to remove humics, and in a second facet, heavy metal-extracting extractants are employed to recover heavy metals, from the acid.

REFERENCES:
patent: 1838431 (1931-12-01), Milligan
patent: 3781410 (1973-12-01), Von Semel
patent: 3894143 (1975-08-01), Von Semel et al.
patent: 4018869 (1977-04-01), Beltz et al.
patent: 4087512 (1978-05-01), Reese et al.
Cason, Basic Experimental Organic Chemistry, 1964, pp. 44-53.

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