Abstract: Provided is a method for producing a separation membrane including a silicalite membrane without using NaOH or the like that causes an increase in cost with respect to equipment, facilities, and process time. The method for producing a separation membrane is a method for producing a separation membrane including a porous support and a silicalite membrane that is formed on the support and has an MFI-type zeolite crystal structure, and is characterized in that the method includes a step of producing a seed crystal, a step of attaching the seed crystal onto the porous support, a step of producing a membrane synthesis raw material composition containing SiO2, an organic template, and H2O, and a step of immersing the porous support having the seed crystal attached thereto in the membrane synthesis raw material composition and performing hydrothermal synthesis, and the composition ratio of the membrane synthesis raw material composition is as follows: SiO2:organic template:H2O=1:(0.05 to 0.15):(50 to 120).

Abstract: Provided is a method for producing a separation membrane including a silicalite membrane without using NaOH or the like that causes an increase in cost with respect to equipment, facilities, and process time. The method for producing a separation membrane is a method for producing a separation membrane including a porous support and a silicalite membrane that is formed on the support and has an MFI-type zeolite crystal structure, and is characterized in that the method includes a step of producing a seed crystal, a step of attaching the seed crystal onto the porous support, a step of producing a membrane synthesis raw material composition containing SiO2, an organic template, and H2O, and a step of immersing the porous support having the seed crystal attached thereto in the membrane synthesis raw material composition and performing hydrothermal synthesis, and the composition ratio of the membrane synthesis raw material composition is as follows: SiO2:organic template:H2O=1:(0.05 to 0.15):(50 to 120).

Abstract: The invention provides a process for separation and recovery of an olefin from a mixture of a paraffin and an olefin, contains a separation membrane containing a porous substrate and a zeolite layer that is formed on a surface and/or in a surface layer of the substrate, the zeolite layer being a hydrophilic zeolite layer that has an Si/Al ratio of 1.3 Si/Al 3.5 and a separation factor ?, which is expressed by a value of a water/IPA weight ratio of a permeated component divided by that of a feed component in a pervaporation test at a temperature of from 40 to 75° C. of a water-isopropanol mixture containing from 15 to 30% by weight of water, of 10 a 4,000.

Abstract: The invention provides an apparatus for separation and recovery of an olefin, having a separation membrane that permeates an olefin with high selectivity and is excellent in durability. The apparatus for separation and recovery of an olefin from a mixture of a paraffin and an olefin, contains a separation membrane containing a porous substrate and a zeolite layer that is formed on a surface and/or in a surface layer of the substrate, the zeolite layer being a hydrophilic zeolite layer that has an Si/Al ratio of 1.3?Si/Al?3.5 and a separation factor ?, which is expressed by a value of a water/IPA weight ratio of a permeated component divided by that of a feed component in a pervaporation test at a temperature of from 40 to 75° C. of a water-isopropanol mixture containing from 15 to 30% by weight of water, of 10???4,000.

Abstract: The method for separating water by a separation membrane is a method for separating water from an aqueous organic acid solution by the separation membrane, and the separation membrane consists of polycrystalline membrane of mordenite (the chemical composition of the frame: AlnSi40-nO96, 2?n?, further, a major component of exchangeable cations present in ion exchange sites of the mordenite is protons (H+). The separation membrane for dehydrating an aqueous organic acid solution exhibits unexpectedly remarkable water permeability and has excellent acid resistance, without damaging water separation selectivity. The method for separating water using this separation membrane enables, for example, realizing the process of dehydrating acetic acid by the separation membrane, and a great energy saving. There are provided the above-described separation membrane for dehydrating an aqueous organic acid solution, and the method for manufacturing it.