Copolyimide gas separation membranes

A technology of gas separation membrane and polyimide, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve the problems such as the tolerance of hydrocarbon solvents that have not been reported

Inactive Publication Date: 2004-03-17
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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Problems solved by technology

However, the resistance of the membranes to hydrocarbon solvents is not reported

Method used

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  • Copolyimide gas separation membranes

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Embodiment Construction

[0033] The invention is described below by way of examples of some representative embodiments thereof, in which all parts, ratios and percentages are by weight unless otherwise indicated. All weights and measurements not originally obtained in SI units have been converted to SI units.

[0034] A 250 mL three necked round bottom flask equipped with a mechanical stirrer, nitrogen inlet and Dean-Stark trap was flame dried under nitrogen atmosphere and allowed to cool to ambient temperature. The diamine mixtures shown in Table I (0.025 moles total) were all dissolved in about 80-90 mL of NMP. The aromatic dianhydride or mixture of dianhydrides in Table I (0.025 mole) was then added along with an additional 10-20 mL of NMP. The solution was stirred at room temperature for 2 hours. Then add about 30mL of o-dichlorobenzene (ODCB) or toluene, heat the solution and keep it at 150-180°C for 5-25 hours to azeotropically remove water. The polymer was then precipitated in water or metha...

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Abstract

A gas separation membrane is formed from a copolyimide produced by copolymerization of monomers which include o-tolidine sulfone, at least one other hydrophilic diamine and 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride. One or more additional aromatic dianhydrides can optionally be included. The novel membrane exhibits an excellent combination of high selectivity of gases to be separated from a gas mixture, high permeability and strong solvent resistance to hydrocarbon chemicals. The membrane is therefore useful in separating gases from gas mixtures in which vapor or liquid hydrocarbon contaminants are present, for example in the separation of carbon dioxide from methane and/or nitrogen in the purification of natural gas.

Description

field of invention [0001] This invention relates to gas separation membranes comprising copolyimides and methods of using such membranes to separate one or more gases from a mixture of gases. Background of the invention [0002] Many industrial gas separation processes employ selectively gas permeable membranes. Aromatic copolyimides are suggested as membrane materials in some gas separation processes. Some aromatic copolyimide membranes have been developed to provide high relative selectivity of one gas over another gas permeating through the membrane. However, this membrane has a low gas permeation rate. On the other hand, different copolyimide gas separation membranes have much higher gas permeation rates, but they have correspondingly lower relative gas selectivities. [0003] In addition to good gas separation properties, industrially important processes often place other stringent requirements on membrane materials. For example, the purification of natural gas invo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/22B01D71/32B01D71/64C08G73/10
CPCY02C10/10B01D53/228B01D71/64Y02C20/40
Inventor J·W·西蒙斯
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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