Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing
Patent
1979-05-07
1981-05-05
Carter, Herbert T.
Chemistry of inorganic compounds
Sulfur or compound thereof
Oxygen containing
423240, 423293, 423489, C01B 1790, C01B 3506, C01B 908, C01B 700
Patent
active
042658713
ABSTRACT:
Sulfuric acid contaminated with boron and fluoride values such as the waste acid of a boron trifluoride process is purified by contacting the contaminated acid with an inert gas to desorb boron trifluoride, and the inert gas is stripped by contacting with an absorbing liquid including concentrated sulfuric acid. Fluosulfonic acid is added to contaminated sulfuric acid at levels approximately three times the molar values of boric acid contaminant as an agent to spring non-volatile boron values. The absorption of boron trifluoride into the absorbing sulfuric acid is improved when it contains boric acid. Preferably the contaminated sulfuric acid to be purified is one portion of the waste liquid and the absorbing liquid is another portion of the waste liquid of a boron trifluoride manufacturing process. Boric acid is added to the absorbing liquid, then boron trifluoride is stripped from the inert gas and absorbed into the absorbing liquid. The absorbing liquid along with stripped boron trifluoride is recycled to a boron trifluoride manufacturing process. The inert gas can be recycled to the desorbing step.
REFERENCES:
patent: 2381027 (1945-08-01), Baldeschwieler et al.
patent: 2416133 (1947-02-01), Young et al.
patent: 2697027 (1954-12-01), Swinehart et al.
Eibeck Richard E.
Evans Francis E.
Felice, Jr. Charles J.
Robinson Martin A.
Allied Chemical Corporation
Carter Herbert T.
Doernberg Alan M.
Friedenson Jay P.
Straub Gary P.
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