Continuous production of silicon tetrafluoride gas in a...

Details Continuous production of silicon tetrafluoride gas in a... Continuous production of silicon tetrafluoride gas in a...

C - Chemistry, Metallurgy

01

B

23/179

C01B 33/10 (2006.01) C01B 33/107 (2006.01)

Patent

CA 1201574

ABSTRACT CONTINUOUS PRODUCTION OF SILICON TETRAFLUORIDE GAS IN A VERTICAL COLUMN Silicon tetrafluoride gas is produced by reacting aqueous fluosilicic acid and concentrated sulfuric acid in a vertical column. The fluosilicic acid is fed to an intermediate point of the column and the sulfuric acid to the top of the column. Silicon dioxide, both dissolved and suspended, is fed with fluosilicic acid in some forms so as to produce a by-product acid substan- tially free of silicon and fluoride values.

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