C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
260/440.6
C07F 7/18 (2006.01) C08G 77/04 (2006.01) C08G 77/08 (2006.01) C08G 77/10 (2006.01)
Patent
CA 1048520
ABSTRACT OF THE DISCLOSURE A continuous process for producing diorganopoly- siloxane oils of 3 to 50,000 centipoise viscosity at 25°C with a controlled hydroxy content comprising continuously transferring a fluid siloxane feed mixture into contact with a catalyst bed of acid-activated granular carbon black having a carbon to acid ratio of 10 parts to 1 to 40 parts to 1, which catalyst bed is maintained at 85 to 150°C and over which catalyst bed there is maintained a vacuum of 5 to 200 millimeters of mercury . From this catalyst bed there is continually removed water. From the catalyst bed there is continually removed water. From the catalyst bed there continuously passes a product stream containing the desired diorganopolysiloxane product of 3 to 50,000 centipoise viscosity and various other low boiling siloxanes, which product stream contains 100 parts per million to 1% by weight of water and from 0 to 5 parts per million of acid. In a variation of this continuous process, the siloxane feed stream is passed into a first catalyst bed which may be in a column which is again filled with acid-activated granular carbon black with the same carbon to acid ratio as set forth above and over which there is a vacuum such that the water is continuously removed from the siloxane feed mixture so that there passes from said first catalyst bed a first product stream containing less than 100 parts per million of water. Said first product stream is passed into a second catalyst bed of acid- activated granular carbon black of the same carbon to acid ratio as set forth in the previous process and which second catalyst bed is again maintained at 85 to 150°C and which is at least at atmospheric pressure. There is continually transferred from the second catalyst bed a second product stream containing the desired diorganopolysiloxanes of 3 to 50,000 centipoise viscosity at 25°C and also having therein various low boiling siloxanes which second product stream has 0 to 50 parts per million of acid and less than 100 parts per million of water.
211070
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