Chromatographic column packing having a bonded organosiloxane co

Details Chromatographic column packing having a bonded organosiloxane co Chromatographic column packing having a bonded organosiloxane co

1980-05-14

1981-06-30

Adee, John

Gas separation

Means within gas stream for conducting concentrate to collector

2101983, 55386, B01D 1508

Patent

active

042760615

ABSTRACT:
Improved packings for columns useful in gas chromatography are made by a multistep process whereby polysiloxane molecules having various organic substituents are chemically bonded to the surface of a siliceous support. The process comprises one or more cycles of successive reactions with an activated support surface of silicon tetrachloride, an organic dichlorosilane, silicon tetrachloride a second time, a polysiloxane polyol, with intermediate hydrolyses where appropriate to provide reactive terminal silanol groups and a final capping reaction with an organic monochlorosilane. The packing as so prepared is further improved by coating with a conventional stationary phase.

REFERENCES:
patent: 3417028 (1968-12-01), Montgomery et al.
patent: 3954631 (1976-05-01), Donike
patent: 4131542 (1978-12-01), Bergna
Journal of Chromatography Science; vol. 15, pp. 335-350, Sep. 1977.

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