Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1980-09-25
1982-05-04
Vertiz, O. R.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423395, 423551, 423641, C01B 2530, C01D 502, C01D 904
Patent
active
043281966
ABSTRACT:
Alkali metal-containing salt products selected from the group consisting of alkali metal dihydrogen phosphate, alkali metal sulfate, alkali metal nitrate, and mixtures thereof, together with alkaline earth metal fluoride, are produced from alkali metal fluosilicate by the steps of:
(a) reacting alkali metal fluosilicate with alkaline earth metal ion in an aqueous solution to form alkali metal hydroxide and solid alkaline earth metal fluoride with SiO.sub.2 ;
(b) separating the solid alkaline earth metal fluoride and SiO.sub.2 and recovering as useful products;
(c) reacting the remaining alkali metal hydroxide solution with a mineral acid selected from the group consisting of phosphoric acid, sulfuric acid, nitric acid, and mixtures thereof, at a temperature in the range of about 30.degree.-100.degree. C. until the reaction is complete; and
(d) recovering the alkali metal-containing product.
Also provided by this invention is a continuous system for conducting this reaction whereby mother liquors may be recycled and the acid reused in the process, and wherein mineral acid is recovered from which anhydrous HCl can be produced.
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Drechsel Erhart K.
Sardisco John B.
Langel Wayne A.
Pennzoil Company
Vertiz O. R.
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