Chemistry of inorganic compounds – Halogen or compound thereof – Hydrogen halide
Patent
1975-07-15
1977-03-01
Vertiz, Oscar R.
Chemistry of inorganic compounds
Halogen or compound thereof
Hydrogen halide
423555, C01B 722, C01F 1146
Patent
active
040102459
ABSTRACT:
In the production of hydrofluoric acid and calcium sulfate by subjecting sulfuric acid and fluorspar to a partial preliminary reaction in a preliminary reaction zone and the reaction is completed in an after-reaction zone at a temperature from about 100.degree. to 500.degree. C, the improvement which comprises effecting the preliminary reaction by circulating preliminary reaction product through said preliminary reaction zone, adding to the circulating preliminary reaction product at spaced locations in the preliminary reaction zone sulfuric acid preheated to a temperature of about 80.degree. to 200.degree. C and fluorspar preheated to a temperature of about 400.degree. to 800.degree. C, removing from said preliminary reaction zone gaseous hydrofluoric acid and a substantially dry mixture of calcium sulfate, unreacted sulfuric acid and fluorspar, and passing said dry mixture of calcium sulfate, unreacted sulfuric acid and fluorspar to said after-reaction zone. Only some of the necessary sulfuric acid may be supplied to the preliminary reaction zone and the balance supplied to the after-reaction zone. Heating of the preliminary reaction zone can be external or materials can be added which will react exothermically, e.g. SO.sub.3 to react with water in the system, CaO to react with sulfuric acid. A suitable apparatus is provided, comprising two parallel troughs connected at their ends by overflows and with oppositely rotating screws to circulate the contents. Means are provided for introducing reactants at spaced locations and for removing a mixture of product plus unreacted starting materials.
REFERENCES:
patent: 3607121 (1971-09-01), Watson et al.
patent: 3718736 (1973-02-01), Watson et al.
patent: 3825655 (1974-07-01), Eipeltauer et al.
Guth Hans
Rohe Hermann
Schabacher Werner
Spreckelmeyer Bernhard
Bayer Aktiengesellschaft
Straub Gary P.
Vertiz Oscar R.
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