Method for preparing fixed carrier compound membrane for CO2 separation by utilizing interfacial polymerization

Abstract

The invention discloses a method for preparation of CO2 carrier- fixed complex film with interfacial polymerization, belonging to the technique for preparation of film. The method contains the following steps: using a sheet film of polysulfone or polyethersulfone or a hollow fibre film as the basilemma, treating the surface of basilemma with a sodium dodecyl sulfonate water solution; soaking the treated basilemma in a diethylenetriamine, triethylene tetraamine, tetraethylene pentamine or polyethylene polyamine water solution in room temperature, and then adding to a trimesoyl- chloride skellysolve B solution or isophthaloyl- chloride skellysolve B solution or trimesoyl- chloride and isophthaloyl- chloride skellysolve B solution to generate interfacial polymerization; purifying the complex film with ionic hydration and drying naturally or drying naturally after a definite thermal treatment. The prepared complex film has a separation factor of 40- 200 to the mixture of CO2 / CH4, and a penetration ratio of 1- 6* 10- 5cm3(STP) / cm2.s.cmHg of CO2. The process is simple and it is easy to operate.

Description

technical field

[0001] The invention relates to a method for preparing and separating CO by interfacial polymerization 2 The invention relates to a method for fixing a carrier composite membrane, which belongs to the preparation technology of a gas separation composite membrane. Background technique

[0002] Fixed carrier gas separation composite membrane is a new type of gas separation membrane, which has high permeability and selectivity at the same time. Compared with other types of carrier membranes - liquid membranes and ion exchange membranes, the fixed carrier composite membrane is not easy to lose, and its stability is greatly improved. Separation of CO 2 Gas immobilized carrier composite membranes are rare in research at home and abroad, and only a few researchers focus on preparing immobilized carrier composite membranes by dip coating or plasma polymerization. Interfacial polymerization is a simple and practical method for preparing ultrathin composite films. ...

Images