Microporous molecular separation membrane with high...

Details Microporous molecular separation membrane with high... Microporous molecular separation membrane with high...

B - Operations, Transporting

01

D

B01D 71/70 (2006.01) C08G 77/50 (2006.01) C08G 77/52 (2006.01) C08L 83/14 (2006.01)

Patent

CA 2636322

A hydrothermally stable, microporous organic-inorganic hybrid membrane based on silica, having an mean pore diameter of between 0.2 and 1.5 nm, is characterised in that between 5 and 40 mole% of the Si-O-Si bonds have been replaced by mo ieties having the one of the formulas: Si-{[CmH(n-1)X]-Si-}q, Si-[CmH(n-2)X2]-Si or Si-CmHn-Si{(CmHn)-Si-}y in which m = 1-8, n = 2m, 2m-2, 2m-4, 2m-6 or 2m-8; provided that n >= 2, X = H or (CH2)pSi, p = 0 or 1, and q = 1, 2, 3 or 4. The membrane can be produced by acid-catalysed hydrolysis of suitable bis- silane precursors such as bis(trialkoxysily)alkanes, preferably in the presence of monoorganyl-silane precursors such as trialkoxy- alkylsilanes.

L'invention concerne une membrane hybride organique-inorganique microporeuse, hydrothermiquement stable, à base de silice, présentant un diamètre de pore moyen compris entre 0,2 et 1,5 nm, ladite membrane étant caractérisée en ce qu~entre 5 et 40 % en moles des liaisons Si-O-Si ont été remplacées par des fonctions représentées par l~une des formules : Si-{[CmH(n-1)X]-Si-}q, Si-[CmH(n-2)X2]-Si ou Si-CmHn-Si{(CmHn)-Si-}y avec m = 1-8, n = 2m, 2m-2, 2m-4, 2m-6 ou 2m-8 ; à condition que n >= 2, X = H ou (CH2)pSi, p = 0 ou 1, et q = 1, 2, 3 ou 4. La membrane peut être fabriquée par hydrolyse catalysée par des acides de précurseurs bis-silane appropriés tels que les bis(trialcoxysily)alcanes, de préférence en présence de précurseurs monoorganyl-silane tels que les trialcoxy-alkylsilanes.

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