Process for the preparation of cyclic polydiorganosiloxanes

Details Process for the preparation of cyclic polydiorganosiloxanes Process for the preparation of cyclic polydiorganosiloxanes

1973-12-28

1976-11-02

Shaver, Paul F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07F 708

Patent

active

039897338

ABSTRACT:
Cyclic polydiorganosiloxanes, in particular, cyclic trisiloxanes are continuously prepared from mixed polydiorganosiloxane, the starting material, by subjecting them to thermal cracking and rectification in a reactor composed of a column, vertically held, comprising a catalyst zone at the lower part in which the thermal cracking takes place to produce cyclic polydiorganosiloxanes and a rectification zone at the upper part in which the cyclic polydiorganosiloxanes are rectified into several fractions and a still positioned below the column. The cyclic polydiorganosiloxanes have structures different from the starting polydiorganosiloxanes.

REFERENCES:
patent: 3484469 (1969-12-01), Guinet et al.
patent: 3558681 (1971-01-01), Kuznetsova et al.
patent: 3607898 (1971-09-01), Macher

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