초록 ▼

A polysulfone-zeolite composite membrane can be used to separate gas pairs such as hydrogen/carbon dioxide. Zeolite, preferably zeolite 3A particles are covalently bonded to the polymer using an aminofunctional methoxysilane as a coupling agent to bind the zeolite particles to an aldehyde modified p

A polysulfone-zeolite composite membrane can be used to separate gas pairs such as hydrogen/carbon dioxide. Zeolite, preferably zeolite 3A particles are covalently bonded to the polymer using an aminofunctional methoxysilane as a coupling agent to bind the zeolite particles to an aldehyde modified polysulfone matrix.

대표청구항 ▼

1. A composite gas separation membrane comprising a polymer covalently bonded to a zeolite. 2. The membrane of claim 1, wherein the polymer is bonded to the zeolite by a coupling agent capable of bonding with the polymer and the zeolite. 3. The membrane of claim 2, wherein the polymer polysulfone al

1. A composite gas separation membrane comprising a polymer covalently bonded to a zeolite. 2. The membrane of claim 1, wherein the polymer is bonded to the zeolite by a coupling agent capable of bonding with the polymer and the zeolite. 3. The membrane of claim 2, wherein the polymer polysulfone aldehyde is bonded to zeolite 3A by a coupling agent capable of bonding with the zeolite and with the polysulfone alderhyde. 4. The membrane of claim 3, wherein the coupling agent is aminopropyltrimethoxysilane. 5. The membrane of claim 4, including 5 to 7 wt % of polysulfone aldehyde and 33 to 50 wt % of zeolite based on the total weight of the membrane exclusive of coupling agent. 6. The membrane of claim 5, including 5 to 7 wt % of polysulfone aldehyde and 41% zeolite, based on the total weight of the membrane exclusive of coupling agent. 7. The membrane of claim 1, wherein the polymer is polysulfone bonded to the zeolite by a coupling agent capable of bonding with the zeolite and with the polysulfone. 8. A process for preparing a composite glassy polymer zeolite gas separation membrane comprising the step of covalently bonding zeolite particles to the polymer. 9. The process of claim 8, wherein bonding is effected by preparing a solution of the polymer, preparing a dispersion of ground zeolite particles; and mixing the dispersion with the polymer solution and a coupling agent capable of covalently bonding the zeolite particles to the polymer. 10. The process of claim 9, wherein the polymer is polysulfone and the zeolite is zeolite 3A. 11. The process of claim 9, wherein the polymer is polysulfone aldehyde and the particles are zeolite 3A. 12. The process of claim 11, wherein the coupling agent is aminopropyltrimethoxysilane. 13. The process of claim 8, wherein the polymer is polysulfone aldehyde and bonding is effected by preparing and refluxing a suspension of ground zeolite and coupling agent in a solvent; adding a solution of polysulfone aldehyde to the mixture thus produced, casting the solution onto flat moulds; and drying the resulting film to yield the membrane. 14. The process of claim 13, wherein drying is effected in a first drying step at room temperature in an inert atmosphere, and then, in a second drying step, at 75° C. for a first period of time and, in a third drying step at 60° C. for a second period of time. 15. The process of claim 14, wherein each said first, second and third drying steps lasts twenty-four hours.