Abstract:
The present invention relates to a method of preparing a perm-selective porous membrane and a method of separating gases using the prepared porous membrane. According to the present invention, a membrane is synthesized using a hierarchically structured alumina porous support by a counter diffusion method. During this synthesis, the diffusion rate of metal ions loaded on the porous support is controlled by controlling the pore size of the porous support, and the position at which the membrane is synthesized is controlled by synthesizing the membrane inside the support. This can increase the physical stability of the membrane and make the membrane thicker so as to ensure higher H 2 /CO 2 separation factors.
Abstract:
A membrane contactor system for separating CO2 from a mixed gaseous feed stream comprising CO2, said contactor system comprising: (i) a composite membrane, said membrane having a permeate side and a retentate side; (ii) said retentate side being exposed to a mixed gaseous feed stream comprising carbon dioxide; (iii) said permeate side being exposed to a carbon dioxide capture organic solvent; (iv) said composite membrane comprising a porous layer and a non-porous selective polymer layer, said non-porous selective polymer layer selectively allowing transport of CO2 across the composite membrane from said mixed gaseous feed stream so that it dissolves in said capture solvent whilst limiting the transport of said capture solvent across the composite membrane.
Abstract:
This invention refers to a microporous crystalline material of zeolitic nature that has, in its calcined state and in the absence of defects in its crystalline matrix manifested by the presence of silanols, the empirical formula x(M1/nXO2):yYO2:gGeO2:(1−g)SiO2 in which M is selected between H+, at least one inorganic cation of charge +n, and a mixture of both, X is at least one chemical element of oxidation state +3, Y is at least one chemical element with oxidation state +4 different from Si, x takes a value between 0 and 0.2, both included, y takes a value between 0 and 0.1, both included, g takes a value between 0 and 0.5, both included that has been denoted ITQ-55, as well as a method for its preparation. This invention also relates to uses of the crystalline material of zeolitic nature for adsorption of fluid components, membrane separation of fluid components, storage of fluid components, and catalysis of various conversion reactions.
Abstract:
The present application relates to an apparatus for purifying isopropyl alcohol. The present application enables isopropyl alcohol to be obtained in a high purity from a feed comprising water and isopropyl alcohol with a minimum amount of energy consumption.
Abstract:
The invention relates to a multi-layer, metal or ceramic membrane device comprising a macro-porous substrate layer having pores with a pore diameter greater than 50 nm, and at least one meso-porous intermediate layer arranged thereon and having pores with a pore diameter of 2 to 50 nm. The membrane device according to the invention additionally comprises at least one micro-porous covering layer arranged on the meso-porous intermediate layer and having pores with an average pore diameter of 0.3 to 1.5 nm, comprising graphite oxide or few-layered graphene oxide or graphite or few-layered graphene. In an advantageous embodiment, the covering layer comprises between 5 and 1000 layers of graphene oxide. Via at least partial reduction of the graphene oxide, in an advantageous embodiment, the cover layer can comprise between 5 and 1000 layers of partially reduced graphene oxide or graphene. The multi-layer, chemically and mechanically stable and temperature resistant membrane device according to the invention, comprising the functional micro-porous graphene oxide or graphene-containing covering layer, is advantageously suitable for use in water separation or water purification, or also for gas separation.
Abstract:
There are disclosed a ceramic separation membrane structure in which a zeolite separation membrane formed on a ceramic porous body is repaired, and a repair method thereof. In the ceramic separation membrane structure, a zeolite separation membrane 33 is disposed on a ceramic porous body 9, and defects of the zeolite separation membrane 33 are repaired by zeolite repaired portions 34 containing zeolite of structure different from the structure of zeolite of the zeolite separation membrane 33. The zeolite separation membrane 33 and the zeolite repaired portions 34 are made of a hydrophobic zeolite having a ratio of SiO 2 /Al 2 O 3 = 100 or more.
Abstract translation:公开了一种在陶瓷多孔体上形成的沸石分离膜被修复的陶瓷分离膜结构及其修复方法。 在陶瓷分离膜结构中,在陶瓷多孔体9上设置沸石分离膜33,通过沸石修复部34修复沸石分离膜33的缺陷,沸石修复部34含有与沸石分离沸石结构不同的结构的沸石 沸石分离膜33和沸石修复部34由SiO 2 / Al 2 O 3 = 100以上的疏水性沸石构成。
Abstract:
Effect ion-exchange of an alpha-alumina supported zeolite (e.g. a MFI zeolite, an LTA zeolite or a FAU zeolite) membrane, which process comprises: a) placing the membrane, which has a first surface and a spaced apart second surface, the first and second surfaces defining therebetween the membrane, in an ion exchange apparatus such that the first surface is in contact with an ion exchange solution and the second surface is in contact with a vapor space that is connected to a source of reduced pressure; b) actuating the source of reduced pressure to create a pressure differential between the first and second membrane surfaces of at least 0.4 atmosphere (0.405×105 pascals); and c) maintaining the pressure differential under ion exchange conditions for a period of time sufficient to effect exchange of an ion contained in the ion exchange solution with an ion in the zeolite membrane in an amount that is greater than an amount of ion exchange attained using an apparatus that places the second surface in contact with a liquid solvent that is at a pressure of at least one atmosphere (1.013×105 pascals) and the first surface in contact with the ion exchange solution at a pressure of at least two atmospheres (2.026×105 pascals) so as to establish a pressure differential between the two surfaces of at least one atmosphere (1.013×105 pascals), maintaining the pressure differential for the same period of time, and using the same ion exchange membrane, ion exchange solution and ion exchange temperature, the greater amount of ion exchange yielding an improved ion exchange membrane that a ratio of the ion that entered the membrane from the solution to the ion that left the membrane that is greater than that of the ion exchanged membrane prepared with the second surface in contact with the liquid solvent.
Abstract:
A method of separating oxygen from nitrogen involves delivering air to a first side of a membrane (10) comprising a polymer support (12) and a layer (14) of zeolite nanosheet particles with thickness of 2 nm to 10 nm and mean diameter of 5 nm to 5000 nm. The delivered air provides a pressure differential between opposite sides of the membrane (10), thus causing oxygen in the hollow core to diffuse through the polymer support (12) and the zeolite nanosheet layer (14) to the second side of the membrane (10). The preferential diffusion of oxygen (compared to diffusion of nitrogen) through the membrane produces nitrogen-enriched air on the first side of the membrane (10) and oxygen-enriched air on the second side of the membrane (20).
Abstract:
Provided is a simple method for regenerating a zeolite membrane which has been exposed to water. The method for regenerating a zeolite membrane is a method for regenerating a zeolite membrane which is formed on a ceramic porous body and subjected to removal treatment of structure directing agent. Heating is performed at a regeneration temperature at which the difference in ratio of thermal expansion amount between the ceramic porous body and the zeolite membrane is 0.3% or less when 40°C is set as datum. The regeneration temperature is preferably a temperature not exceeding the oxidative pyrolysis temperature of the structure directing agent used in the formation of the zeolite membrane.