The present disclosure relates to the field of porous material synthesis, and particularly to a method for preparing porous aromatic framework membranes based on an inorganic salt template method. It aims at the problem of difficulty of preparation of porous aromatic framework membranes in large scale and large size. It uses alkynyl-containing building units and bromine-containing building units as raw materials and obtains continuous, dense, defect-free porous aromatic framework membranes through Sonogashira-Hagihara coupling polymerization. It specifically successfully prepares porous aromatic framework nanosheets on an inorganic salt substrate, and then produces a centimeter-scale large size continuous porous aromatic framework membrane through self-assembly. The method has mild conditions, a simple preparation process, and it is easy to operate. The prepared membranes have high yield and large area, and meet the requirements of actual industrial production.

Provided is a separation membrane that when used in membrane separation of a mixture of a linear hydrocarbon and a branched hydrocarbon and/or cyclic hydrocarbon of equivalent carbon number to the linear hydrocarbon, can efficiently separate the linear hydrocarbon and the branched hydrocarbon and/or cyclic hydrocarbon. The separation membrane includes a porous support and a porous separation layer disposed on the porous support and containing an MFI-type zeolite. In an X-ray diffraction pattern obtained through X-ray diffraction measurement of the porous separation layer, the intensities of diffraction peaks attributed to specific MFI-type zeolite crystal planes satisfy specific relationships.

An osmotic membrane comprises an active layer and a composite support layer. The active layer selectively allows passage of water molecules but rejects at least some dissolved ions. The composite support layer includes a side that is bonded to the active layer and comprises an electrospun-fiber sub-layer and a phase-inversion sub-layer.

The present disclosure may provide a CHA-DDR type zeolite membrane including: a first layer including a CHA structure and a DDR structure; and a second layer which is provided on the first layer and includes a DDR structure, wherein the CHA-DDR type zeolite membrane is in the form of a film having a thickness of 100 nm to 5 m, including a CHA structure and a DDR structure.

A crystalline material contains oxygen, aluminum and phosphorus, and has powder X-ray diffraction peaks shown below. When the peak at 2=14.170.2 is used as the reference peak and the intensity of the reference peak is set to 100, for example, the relative intensity of the peak at 2=8.650.2 is 1 to 15. The relative intensity of the peak at 2=9.990.2 is 1 to 15. The relative intensity of the peak at 2=16.520.2 is 5 to 80. The relative intensity of the peak at 2=17.370.2 is 1 to 15. The relative intensity of the peak at 2=21.810.2 is 10 to 80.

Provided is a composition for use in fabricating a carbon molecular sieve membrane, including a fluorine-containing polymer matrix and polysilsesquioxane. The composition shows high selectivity to the gas to be separated and high separation quality by controlling the mixing ratio of the fluorine-containing polymer matrix with polysilsesquioxane as well as the type of fluorine-containing polymer matrix and polysilsesquioxane. Ancillary selective pore formation is enhanced by a so-called autogenous fluorinated gas induced siloxane etching (A-FISE) mechanism of fluorine-containing polymer/polysilsesquioxane blend precursors during carbonization. Therefore, it is possible to effectively separate gases having a small difference in particle size, which, otherwise, are difficult to be separated with the conventional polymer membranes.

The invention discloses a method for the pervaporation and vapor-permeation separation of a gas-liquid mixture or a liquid mixture by a SAPO-34 molecular sieve membrane prepared in a dry gel process, comprising: 1) synthesis of SAPO-34 molecular sieve seeds; 2) coating the SAPO-34 seeds on a porous support; 3) preparation of a mother liquor for dry gel synthesis of SAPO-34 molecular sieve membrane; 4) supporting the mother liquor for dry gel synthesis on the porous support coated with SAPO molecular sieve seeds and drying; 5) placing the porous support prepared in step 4) into a reaction vessel, adding a solvent, performing crystallization of the dry gel; 6) calcining; 7) using the SAPO-34 molecular sieve membrane obtained from step 6) to perform separation of a gas-liquid mixture or a liquid mixture by a process of pervaporation separation or vapor-permeation separation. The invention has the advantages of very high methanol selectivity and permeation flux, lowering synthesis cost of molecular sieve membrane and lowering environment pollution.

The present invention discloses a method for the pervaporation and vapor-permeation separation of a gas-liquid mixture or a liquid mixture by a SAPO-34 molecular sieve membrane, which comprises: 1) mixing an Al source, tetraethyl ammonium hydroxide, water, a Si source and a P source, and subjecting the resultant to hydrothermal crystallization, then centrifuging, washing and drying to get SAPO-34 molecular sieve seeds; 2) coating the SAPO-34 molecular sieve seeds onto the inner surface of a porous support tube; 3) synthesis of a SAPO-34 molecular sieve membrane tube; 4) calcining the obtained SAPO-34 molecular sieve membrane tube to obtain a SAPO-34 molecular sieve membrane; 5) using the SAPO-34 molecular sieve membrane obtained from step 4) to perform separation of a gas-liquid mixture or a liquid mixture via a process of pervaporation separation or vapor-permeation separation. The invention has the advantages of very high methanol selectivity and permeation flux, and provides an efficient and energy-saving separation way via pervaporation or vapor-permeation separation.

Porous liquid-filtering membranes having a repeatable distribution of pores of a small dimension are provided, as well as pillar templates that are used to produce such liquid filtering membranes. Also disclosed are methods of making and using the pillar templates to make porous liquid filtering membranes.

One object of the present invention is to provide a zeolite membrane that can achieve both practically sufficient separation performance and throughput and maintain the separation performance stably for a long period. Provided is a method of producing a zeolite membrane having CHA crystal structure on an intermediate layer of a porous support, wherein Si/Al (a molar ratio) of CHA zeolite particles is from 9.5 to 100.5 and, in an X-ray diffraction pattern obtained by applying X-ray onto a surface of the zeolite membrane, a peak intensity near 2=18 is less than 0.5 times a peak intensity near 2=21, and/or a peak intensity near 2=10 is less than 4 times a peak intensity near 2=21, the method including: forming the zeolite membrane having the CHA crystal structure on the intermediate layer of the porous support by hydrothermal synthesis, using an aqueous reaction mixture including a Si element source, an Al element source, an alkali source, and an organic template, wherein non-dealuminated FAU zeolite is used as the Si element source and the Al element source.