30results about How to "Improve adsorption and separation efficiency" patented technology

The invention discloses a 5A molecular sieve adsorbent for adsorptive separation of distillate containing n-alkane and a preparation method of the 5A molecular sieve adsorbent. The preparation method comprises the following steps: adding polyquaternary ammonium salt serving as a crystallization synthetic soft template agent into a sol system formed by mixing a silicon source with an aluminum source, and carrying out hydrothermal synthesis to obtain a hierarchically porous 4A molecular sieve with a microporous-mesoporous structure; after the 4A molecular sieve is subjected to soft template agent removal, carrying out roll forming on the treated 4A molecular sieve and a binder to obtain small balls with particle sizes of 0. 2 to 0.8mm; drying, roasting and then carrying out calcium ion exchange and activating to obtain the 5A molecular sieve adsorbent with the microporous-mesoporous structure, wherein the proportion of a 5A molecular sieve in the adsorbent is 90 to 97 weight percent, and the proportion of the binder is 3 to 10 percent. The preparation method of the adsorbent, provided by the invention, has the advantages that a diffusion coefficient of the n-alkane in the molecular sieve is remarkably improved while the synthesized hierarchically porous 5A molecular sieve maintains higher equilibrium adsorption capacity for the n-alkane, thereby increasing the rate of adsorptive separation.

The invention discloses preparation and application of a high-stability cuprous modified metal organic framework material. The high-stability cuprous modified metal organic framework material is involved and comprises a hydrophobic coating and a cuprous modified metal organic framework material; the mass ratio of the hydrophobic coating to the cuprous modified metal organic framework material is (0.02-0.3):1. The preparation method of the high-stability cuprous modified metal organic framework material is further involved. The method comprises the step that the surface of the cuprous modifiedmetal organic framework is coated with the hydrophobic coating. The stability and humidity resistance of the high-stability cuprous modified metal organic framework material are high, and the high-stability cuprous modified metal organic framework material can be applied to desulfuration of fuel oil, separation of olefin and alkane and recycling of carbon monoxide.

The invention discloses a method for liquid phase simulated moving bed adsorption separation of p-xylene in C8 aromatic hydrocarbon. The method includes: introducing a C8 aromatic hydrocarbon raw material into a simulated moving bed to adsorb bed p-xylene therein to obtain raffinate, introducing a desorption agent into adsorption bed layers to desorb the adsorbed p-xylene, discharging the obtainedextracted liquid out of the simulated moving bed, separating the adsorption bed layers into a desorption area, a purification area, an adsorption area and an isolation area by the materials going inand out of the simulated moving bed, wherein the adsorbent active ingredient is BaX or BaKX zeolite, and the desorption agent is p-diethylbenzene, controlling the temperature of the C8 aromatic hydrocarbon raw material entering the adsorption bed layers of the simulated moving bed at 100-155DEG C, and the temperature of the desorption agent introduced into the adsorption bed layers of the simulated moving bed at 170-210DEG C. The method can improve the separation efficiency of the process for simulated moving bed separation of p-xylene in C8 aromatic hydrocarbon.

The invention discloses a method for adsorbing and separating p-cresol and m-cresol. The method comprises the following steps: feeding a mixture of p-cresol and m-cresol into an adsorption zone of a liquid-phase simulated moving bed to be in contact with an adsorbent, wherein the p-cresol is adsorbed by the adsorbent while the m-cresol is not adsorbed; extracting the liquid as raffinate, introducing a desorption agent into the adsorbent for desorbing the adsorption components and obtaining an extract liquid; wherein the liquid-phase simulated moving bed comprises the following four functionalareas: a first functional area, a second functional area and a third functional area, a desorption zone, a purification zone, an adsorption zone and a buffer zone, the temperature of feeding an adsorption raw material into the adsorption area is 100-230 DEG C; the temperature of feeding a desorption agent into the desorption area is 120-250 DEG C; the temperature of the desorption agent introducedinto the desorption area is controlled to be 10-100 DEG C higher than the temperature of the adsorption raw material introduced into the adsorption area; the active component of the adsorbent is selected from any one of BaX, BaKX and KY molecular sieves, and the desorption agent is a mixture of 30-96% by mass of C3-C5 fatty alcohol and 4-70% by mass of C7-C9 alkane. The method is used for adsorbing and separating a mixture of p-cresol and m-cresol, and high-purity p-cresol and m-cresol products can be respectively obtained.

The invention discloses preparation and application of high-stability cuprous modified mesoporous oxide material. The high-stability cuprous modified mesoporous oxide material is involved and comprises a hydrophobic coating and a cuprous modified mesoporous oxide; the mass ratio of the hydrophobic coating to the cuprous modified mesoporous oxide is (0.02-0.5):1. The preparation method of the high-stability cuprous modified mesoporous oxide material is further involved. The method comprises the step that the surface of the cuprous modified mesoporous oxide is coated with the hydrophobic coating. The stability and humidity resistance of the high-stability cuprous modified mesoporous oxide material are high, and the high-stability cuprous modified mesoporous oxide material can be applied to desulfuration of fuel oil, separation of olefin and alkane and recycling of carbon monoxide.

The invention discloses a multi-stage pore 5A molecular sieve adsorbent for n-alkane adsorption separation and a preparation method thereof. The preparation method comprises adding a long-chain double biquaternary ammonium salt as a soft template agent into a silicon source-aluminum source mixed sol system, carrying out hydrothermal synthesis to obtain a microporous-mesoporous structure multi-stage pore 4A molecular sieve, removing the soft template agent in the 4A molecular sieve, rolling to mold the 4A molecular sieve and a binder so that small particles having diameters of 0.2-0.8mm are obtained, carrying out drying and calcination, and carrying out calcium ion exchange and activation to obtain a microporous-mesoporous structure multi-stage pore 5A molecular sieve, wherein a ratio of the 5A molecular sieve in the adsorbent is 90-97wt% and a ratio of the binder is 3-10%. In the preparation method of the adsorbent, the multi-stage pore 5A molecular sieve has a high equilibrium adsorption capacity of n-alkane, improves a diffusion coefficient of the n-alkane in the molecular sieve and improves an adsorption separation rate.

The invention relates to a magnetic prussian blue material, a preparation thereof, and applications of the magnetic prussian blue material in adsorption of cesium ions. The preparation method comprises following steps: under the effect of a thermal initiator, Fe3O4 nanometer particles and a pyridine compound containing carbon-carbon double bonds, a nonsaturated aromatic hydrocarbon, and an oil soluble crosslinking agent are reacted in water, and polymer coated magnetic nanometer particles are obtained after reaction, wherein the surfaces of the Fe3O4 nanometer particles are modified with double-layer fatty acid; the magnetic nanometer particles and pentacyano mon-ammine ferroate are subjected to ligand exchange reaction so as to obtain the magnetic prussian blue material. The magnetic prussian blue material can be used for adsorption on cesium ions in soil, especially in clay; the magnetic prussian blue material and cationic chitosan are combined for pre-treatment of clay, the adsorption efficiency on cesium ion is high, and soil high efficiency purifying can be realized.

The invention discloses a specific method for rapidly preparing a ZIFs adsorption film by using a vapor phase growth method. The preparation method comprises: coating the surface of a base film with acobalt/zinc-based sol, putting the base film into a drying oven, heating and aging to obtain a cobalt/zinc-based gel coating film, and carrying out a reaction on the cobalt/zinc-based gel coating film and a 2-methylimidazole gas-phase ligand through a gas-phase growth method to prepare the ultrathin ZIFs adsorption film. According to the invention, the preparation method is simple in process, hascontrollability, and is expected to be further applied to preparation of other types of metal organic framework material adsorption films.

The invention discloses a preparing method of a modified aluminum oxide dehydrant. The preparing method comprises the following steps: uniformly blending alumina gel, silica gel, calcium oxide, zinc oxide and sesbania and carrying out kneading, molding, granulating, primary drying, primary roasting, impregnating, secondary drying and secondary roasting in sequence to prepare finished products, carrying out dehydration process before chlorine and oxygen are separated from the mixed gas generated by catalytic oxidation reaction of hydrogen chloride by using adsorption separation method, the mass ratios of alumina gel to silica gel to calcium oxide to zinc oxide to sesbania are (70-82):(7-14):(0.5-2.0):(5-10):(5-10). In the preparing method, water absorption drying agent which is allowed to be used in chlorine-containing gas with small amount of water, and can form the compound absorption bed layer together with the silica gel, the compound bed absorption agent is arranged at the gas outlet end of the compound absorption bed layer to deeply dry and dehydrate gas.