Continuous process for preparing silanes and siloxanes having Si

Details Continuous process for preparing silanes and siloxanes having Si Continuous process for preparing silanes and siloxanes having Si

1980-11-24

1981-11-03

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

556417, 556440, 556457, 556470, C07F 704, C07F 710, C07F 718

Patent

active

042987539

ABSTRACT:
A continuous process for preparing silanes and siloxanes having SiOC groups which comprises (a) introducing in a liquid phase a chlorosilane and a hydroxyl-containing aliphatic compound in parallel flow into a first stage of a first reactor in an amount such that from 0.5 to 0.9 gram-mole of hydroxyl group is present per gram-atom of Si-bonded chlorine; (b) removing the liquid reaction mixture from the first reactor; (c) introducing the reaction mixture at the head of a column used as the second reactor which is maintained at an elevated temperature; (d) adding a hydroxyl-containing aliphatic compound as a gas at the lower end of the column or at a point between the lower end and the upper end of the lower one-third of the column, in an amount at least sufficient to completely react with the Si-bonded chlorine present in the reaction mixture obtained from the first stage and (e) removing the silane containing SiOC groups or polysiloxane containing SiOC groups from the column at a point below the point of addition of the hydroxyl-containing aliphatic compound.

REFERENCES:
patent: 3244739 (1966-04-01), Emblem et al.
patent: 3651117 (1972-03-01), Bennett
patent: 3792071 (1974-02-01), Nitzsche et al.
patent: 4209454 (1980-06-01), Graf et al.
patent: 4226793 (1980-10-01), Kotzsch et al.

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