Process for hydrophobing pyrogenically produced silicon dioxide

Details Process for hydrophobing pyrogenically produced silicon dioxide Process for hydrophobing pyrogenically produced silicon dioxide

C - Chemistry, Metallurgy

01

B

23/192, 117/47.8

C01B 33/18 (2006.01) C09C 1/30 (2006.01)

Patent

CA 1203667

ABSTRACT OF THE DISCLOSURE After separating the hydrogen halide pyrogenically produced silicon dioxide is mixed with nitrogen and fed into a cyclone. After separating the silicon dioxide from the gases, which are returned to the cooling zone of the production appar- atus, the silicone dioxide is mixed first with organo-halo silane and then with water vapour and nitrogen. The hydrophob- ing reaction is subsequently carried out in a conventional manner in a fluidized bed reactor. The waste gases from the reaction are returned to the cyclone.

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