Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1974-08-27
1977-03-01
Vertiz, Oscar R.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423315, 423484, 423390, 423322, C01B 2512, C01B 1516, C01B 2138, C01B 722
Patent
active
040102416
ABSTRACT:
A process for the production of hydrogen fluoride, phosphoric anhydride, calcium polyphosphates and nitric acid, is disclosed, characterized in that natural phosphate is heated by a plasma stream of working gas in the presence of water vapors to form hydrogen fluoride which is recovered as a commercial product. Then the thus defluorinated phosphate is further heated by an air plasma stream having a bulk temperature of at least 3,500.degree. K. and containing nitrogen oxides. Under such conditions, the defluorinated phosphate decomposes to form phosphoric anhydride and calcium oxide.
The gas stream carrying the phosphoric anhydride, the calcium oxide and the nitrogen oxides is cooled down to yield, as commercial products, either phosphoric anhydride and nitric acid, or calcium polyphosphates containing up to 70% P.sub.2 O.sub.5 and nitric acid, or else all of the three products, depending on the cooling conditions.
The advantages of the proposed process are as follows:
High rate of the process,
High concentration of hydrogen fluoride in the gas, and
The possibility of simultaneously producing a range of products from cheap raw material while avoiding the use of other commercial products as feedstock for the process.
REFERENCES:
patent: 3241917 (1966-03-01), Lapple
patent: 3380904 (1968-04-01), Goldberger
patent: 3572991 (1971-03-01), Markey
patent: 3832448 (1974-08-01), Longfield
Burov Igor Sergeevich
Bysjuk Vladimir Vladimirovich
Chelnokov Alexandr Antonovich
Dzjuba Elena Dmitrievna
Ershov Vadim Andreevich
Heller Gregory A.
Vertiz Oscar R.
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