8 results about "Zeolite membranes" patented technology

The application belongs to the technical field of chemistry and chemical industry, and particularly relates to a method for regenerating and utilizing waste stripping liquid of photoresist. The waste stripping liquid of photoresist is regenerated and utilized by the following steps: realizing waste liquid demulsification, viscosity reduction and impurity removal through specific modified magnetic nanoparticles, then carrying out pervaporation dehydration through a zeolite membrane covered with a zirconium-tannic acid-polyethyleneimine metal organic coordination network layer, and finally carrying out adsorption polishing and recombination, so that the waste stripping liquid of photoresist is regenerated and utilized, the water removal rate of the waste liquid is greater than 99.9%, and the recovery rate of effective components in the waste liquid is greater than 99.5%.

A zeolite membrane structure (10) includes a support (20), a zeolite membrane (30), and a protective film (40). The zeolite membrane (30) is formed on a surface (23S) of the support (20). The protective film (40) is formed on a surface (30S) of the zeolite membrane (30). The protective film (40) is composed of organic-inorganic hybrid silica or carbon.

The application belongs to the field of fine chemical product preparation, and discloses a method for preparing gamma-valerolactone based on reaction-separation coupling. The method is realized based on a reaction-separation coupling system, and the reaction-separation coupling system comprises a first reactor, a membrane separation system, a second reactor and a rectification system. The specific steps are as follows: furfuryl alcohol is introduced into the first reactor filled with an acid catalyst at a fixed flow rate to complete hydrolysis to generate levulinic acid, the hydrolysis product is dehydrated through a NaA type zeolite membrane separation system, and then is introduced into the second reactor filled with a hydrogenation catalyst to complete a hydrogenation-cyclization reaction in the presence of isopropyl alcohol as a hydrogen donor; the product is separated through the rectification system to obtain high-purity gamma-valerolactone, and the separated water and unreacted raw materials are returned to the first reactor for recycling. The method realizes efficient circulation of materials and improves the preparation efficiency.

The application discloses a kind of green preparation methods of hydrophilic ZSM-5 zeolite membrane and its application, belong to inorganic membrane separation technical field.The application includes the following steps: S1, precoat ZSM-5 seed on the surface of porous carrier;S2, silicon source, aluminum source, alkali source, deionized water and isopropyl alcohol are mixed, and stirring is obtained even organic ammonium template-free synthesis liquid;S3, the porous carrier of precoat seed is placed in the synthesis liquid, and hydrothermal crystallization reaction is carried out;S4, after reaction, membrane body is taken out, and washed to neutral with deionized water, after drying, calcination treatment, obtain hydrophilic ZSM-5 zeolite membrane.The application avoids the high cost and environmental pollution problem caused by organic ammonium template from root, and the prepared zeolite membrane shows excellent separation performance in pervaporation dehydration of ethanol, isopropyl alcohol, acetone and other various organic solvent-water systems, and has good industrial application prospect.

The dehydration membrane reactor for methanol production from CO2 hydrogenation includes one or more porous supports, a dehydration membrane on the one or more porous supports, and a catalyst layer on the dehydration membrane. The one or more porous supports include hollow ceramic fibers and the dehydration membrane includes NaA zeolite. The reactor is made by dip-coating the porous supports in a zeolite crystal seed solution and drying the coated porous support. The coated porous support is dried at about 80° C. and then heated to a temperature above about 200° C. The NaA zeolite membrane is then grown on the seeded support, and a catalyst layer is applied to the zeolite membrane. A feedstream including carbon dioxide and hydrogen is fed to the catalyst layer, where a product stream including methanol and water is evolved. The water is then removed from the product stream through the dehydration membrane to produce a high-purity methanol product.

This invention belongs to the field of membrane separation technology, specifically relating to a method for preparing a Silicalite-1 zeolite membrane and its application. The method involves preparing sizable and highly crystallizable sheet-like and disc-shaped Silicalite-1 crystals, which are then sequentially coated onto a rough macroporous support surface to form a seed double layer. A composite template agent, such as bis-[1,5-(tripropylammonium)]pentamethylene diiodide, is introduced to regulate the crystallization and growth of the Silicalite-1 zeolite membrane, resulting in a continuous and dense thin-film Silicalite-1 membrane exhibiting high selectivity for N₂ / SF₆. The Silicalite-1 zeolite membrane of this invention demonstrates excellent sieving performance for N₂ and SF₆, which have significantly different kinetic diameters, making it particularly suitable for SF₆ recovery and inert gas purification in industrial waste gas. This method is simple and operates under mild conditions, making it valuable for energy conservation and environmental protection.

The application discloses a kind of MFI type zeolite membrane and its preparation method, belong to membrane separation technical field.The method includes: the open hole MFI zeolite nanosheet is deposited on the surface of polymer porous carrier and forms seed layer, then sequentially carried out silicon source vapor treatment and ammonia steam treatment, induce adjacent nanosheet to occur fusion growth, and in-situ form dense continuous MFI zeolite membrane layer on the surface of polymer carrier.The polymer carrier is selected from nylon, PVDF, PP or PES, silicon source is tetraethyl orthosilicate or methyl orthosilicate, ammonia concentration is 2-8 wt.%, and processing temperature is 50-120 DEG C, without high-temperature calcination in whole process.The application solves the problem that high-temperature calcination destroys polymer carrier in the preparation of traditional MFI membrane, and realizes the effective fusion of MFI nanosheet under low temperature condition.The separation factor of the obtained membrane to n-butane / isobutane can reach 19.13, and the n-butane permeation rate is higher than 1.3*10 ‑7 mol·m ‑2 ·s ‑1 ·Pa ‑1 , with good application prospect.

This invention belongs to the field of inorganic membrane separation technology, specifically relating to a method for preparing a hierarchical porous zeolite membrane formed by the symbiosis of MFI and MEL, and its application. Symbiotic seed crystals are prepared using raw materials including SiO2, TBAOH, and water. These seed crystals are dispersed in anhydrous ethanol to obtain a seed crystal suspension. A preheated carrier is immersed in the seed crystal suspension for coating, calcined and solidified, and then immersed in a synthesis mother liquor formed by a mixture of SiO2, TBAOH, and water. A hydrothermal reaction is then performed to synthesize a zeolite membrane, which is dried, calcined, and cooled to obtain the hierarchical porous zeolite membrane. This hierarchical porous zeolite membrane can be used as a preferential pervaporation membrane for biomass ethanol under relatively low temperature conditions. Experimental results show that 2-5 nm mesopores are successfully introduced into the microporous zeolite membrane. The increased porosity reduces the mass transport path and transport resistance. When applied to the pervaporation separation of biomass ethanol, the membrane exhibits a significantly reduced decrease in long-term pervaporation flux.