Process for removing boron from sulfuric acid

Details Process for removing boron from sulfuric acid Process for removing boron from sulfuric acid

1986-05-19

1988-11-01

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423293, C01B 1790, C01B 3506

Patent

active

047819090

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. Hydrogen fluoride and/or fluorosulfuric acid are added to contaminated sulfuric acid as agents to spring non-volatile boron value. In addition, the water content of the contaminated acid is adjusted within a narrow concentration range, to improve the efficiency of both the stripping and the absorption operations. 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: 4265871 (1981-05-01), Felice, Jr. et al.
patent: 4520006 (1985-05-01), Laviron et al.

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