Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1976-04-21
1978-06-20
Shaver, Paul F.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C07F 720
Patent
active
040961605
ABSTRACT:
An improved process is provided for preparing a linear diorganopolysiloxane fluid having terminal hydroxy groups, which is substantially free of cyclic polysiloxanes. In the process, a linear diorganopolysiloxane fluid containing lower boiling cyclic polysiloxanes is continuously fed with steam into an evacuated, tortuous, confined passageway to form a turbulent mixture of the silicone fluid and steam in the passageway, the mixture is passed through the passageway at elevated temperatures and moderate vacuum to form a vaporized mixture comprising steam and cyclic polysiloxanes which have been freed from the linear diorganopolysiloxane fluid, the vaporized mixture of steam and cyclics and the linear diorganopolysiloxane substantially free of cyclics are removed from the passageway, and the vaporized mixture of steam and cyclics is separated from the cyclic-free diorganopolysiloxane fluid.
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patent: 3469617 (1969-09-01), Palmason
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patent: 3803195 (1974-04-01), Nitzsche et al.
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patent: 3903047 (1975-09-01), Ashby
General Electric Company
Shaver Paul F.
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