Method for preparing polyazacycloalkanes grafted on silica gel and use of grafted compounds

US6372903B1 · kind B1 · utility

Assignees

• COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR
• L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude · FR

Inventors

• Ahmad Mehdi · Montpellier, FR
• Franck Denat · Dijon, FR
• Frédéric Barbette · Langres, FR
• Roger Guilard · Talant, FR
• Gilles Lagrange · Les Ulis, FR

Key dates

• Filing date: Jul 26, 2000
• Grant date: Apr 16, 2002
• Expiry date: Jul 26, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F7/1804
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention concerns a method for preparing polyazacycloalkanes immobilised on a silica gel from a polyazacycloalkane of formula (A) in which: R1 and R2 represent a hydrogen atom, an alkyl radical, or a [hetero(aryl)]alkyl radical; W1, W2 and W3 represent a radical of formula (B): —[(CT1T2)n—[N(R3)]p—(CT3T4)m]l— such as defined in the description; R3 represents a hydrogen atom, an alkyl radical or a [hetero(aryl)]alkyl radical, provided that the polyazacycloalkane ring of the compound of formula (A) comprises not more than 30 cyclic carbon atoms, and not more than 6 cyclic nitrogen atoms. The invention is characterised in that: (a) the compound of formula (A) is reacted with a compound of formula (C): Z—R4—Si(X1)(X2)(X3), such as defined in the description to form a compound of formula (D); (b) said compound of formula (D) is condensed on the silanol sites of a silica gel to form the immobilised polyazacycloalkane of formula (E); and (c) some ethanol sites having not reacted are, if required, protected by Z′, a group protecting the hydroxyl function. The invention is useful for separating oxygen from air.