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    • 7. 发明授权
    • Purification of boron-containing sulfuric acid
    • 含硼硫酸的纯化
    • US4265871A
    • 1981-05-05
    • US36464
    • 1979-05-07
    • Charles J. Felice, Jr.Francis E. EvansMartin A. RobinsonRichard E. Eibeck
    • Charles J. Felice, Jr.Francis E. EvansMartin A. RobinsonRichard E. Eibeck
    • C01B35/00C01B17/90C01B35/06C01B7/00C01B9/08
    • C01B17/90
    • 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.
    • 用硼污染的硫酸和三氟化硼处理的废酸等氟化物值通过使被污染的酸与惰性气体接触以解吸三氟化硼来净化,并且通过与包含浓硫酸的吸收液体接触来汽提惰性气体 。 将氟磺酸加入到污染硫酸中,其水平为硼酸污染物的摩尔值的三倍,作为弹性非挥发性硼值的试剂。 当含有硼酸时,三氟化硼在吸收硫酸中的吸收得到改善。 优选地,被净化的污染硫酸是废液的一部分,吸收液是三氟化硼制造方法的废液的另一部分。 将硼酸加入到吸收液中,然后从惰性气体中汽提三氟化硼并吸收到吸收液中。 将吸收液与汽提的三氟化硼一起再循环至三氟化硼制造方法。 惰性气体可以再循环到解吸步骤。