Process for preparing hydrogen fluoride

Details Process for preparing hydrogen fluoride Process for preparing hydrogen fluoride

1991-05-30

1993-06-15

Straub, Gary P.

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

423484, 423335, C01B 719, C01B 3314

Patent

active

052195511

ABSTRACT:
A process for preparing hydrogen fluoride, which comprises (i) reacting calcium fluoride with sulfuric acid to produce a gypsum and a gas containing hydrogen fluoride, (ii) separating hydrogen fluoride from said gas containing hydrogen fluoride, (iii) absorbing said hydrogen fluoride-separated gas with water to obtain an aqueous solution containing hydrogen fluoride and silicofluoric acid, (iv) reacting calcium carbonate with said aqueous solution to obtain a suspension containing silicic acid and calcium fluoride, (v) adding an alkaline substance to said suspension to make pH at least 8, thereby stabilizing the silicic acid as a colloidal solution, (vi) separating a calcium fluoride solid and the colloidal solution of silicic acid from said suspension, and (vii) recycling the separated calcium fluoride as a starting calcium fluoride.

REFERENCES:
patent: 1851652 (1932-03-01), Soll
patent: 2735245 (1956-07-01), Mitchell et al.
patent: 2780521 (1957-02-01), Butt
patent: 3907978 (1975-09-01), Spreckelmeyer
patent: 4606901 (1986-08-01), Chu et al.
patent: 4690810 (1987-09-01), Breneman et al.
F. Albert Cotton, "Advanced Inorganic Chemistry", 4th edition, pp. 383-385.
Susan Budavari, "The Merck Index", 11th edition, 1989, p. 654.
Gessner G. Hawley, "The Condensed Chemical Dictionary" 10th edition, pp. 919-920.
Ullmann's Encyclopedia of Industrial Chemistry 5th edition, vol. A11, pp. 310-312, 1988, Weinheim.
Soviet Inventions Illustrated Derwent Publications Ltd., Section Chemical, week 8505, abstract No. 85030550; & SU-A-1101403 (Irkut Alum Magn Ele) Jul. 7, 1984.
Soviet Inventions Illustrated Derwent Publications Ltd., Section Chemical, week 7504, abstract no. 7506983W; & SU-A-420565 ( S. I. Volfkovich et al.) Aug. 22, 1974.

Affiliated with

Also associated with

Rating

Process for preparing hydrogen fluoride does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for preparing hydrogen fluoride, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing hydrogen fluoride will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1040717