690 results about "Adsorption selectivity" patented technology

The invention relates to a porous metal organic framework material based on transition metal cobalt and a preparation method thereof. The metal organic framework material is a compound with supramolecular porous network structure and formed by self-assembly of metal ions and organic ligands through coordination complexation. The porous cobalt-based metal organic framework material contains one or more metal ions, and one or more organic ligands; and at least one of the metal ions is Co (II). The porous cobalt-based organic framework material has excellent selective adsorption on CH4 in a separation process of CH4 and N2; and the advantage of adsorption selectivity on CH4 is particularly evident under low pressure. The material is particularly suitable for development and recovery of oil field gas, coal bed methane and biogas.

The resin-based dearsenifying adsorbent is prepared with macroporous and gel type strong alkaline anionic exchange resin as basic material and water solution of FeCl3, HCl, NaCl in different compounding proportions as reagent, and through reaction. The strong alkaline anionic exchange resin has Fe(III) carrying amount of 2-9 wt%. Compared with strong alkaline anionic exchange resin without Fe(III) carried, the strong alkaline anionic exchange resin with Fe(III) has even higher adsorption selectivity and adsorption capacity on high toxicity As(III) and As(V) in water and excellent kinetic performance. The resin-based dearsenifying adsorbent of the present invention has greatly raised, normally 200 times raised, adsorption selectivity on micro as in water solution, and raised, normally 40-300 % raised, adsorption capacity, and is favorable to improving water environment quality.

The adsorbent for adsorbing and separating paraxylene includes active adsorbing component in mass fraction 85-95 % and adhesive in mass fraction 5-15 %. The active adsorbing component is selected from BaX zeolite and BaKX zeolite, and the adhesive is selected from kaolin, silica and alumina, with the crystal grain size of X zeolite in the adsorbent being 0.5-1.0 micron. The adsorbent is suitable for adsorption and separation of paraxylene from C8 arene and has high adsorption selectivity.

The invention discloses a nano-compound adsorbent for efficiently removing trace phosphorus, arsenic and antimony from a water body, belonging to the technical field of environment functional materials. The organic framework of the nano-compound adsorbent of the invention is hypercrosslinked styrene-divinylbenzene ion exchange resin, a functional group for surface binding of the organic framework is a quaternary ammonium group or pyridyl, nano-inorganic functional particles are loaded, and the total volume of 1-20nm nano-pores accounts for greater than or equal to 90% of the total volume of all the pores of the organic framework. The nano-inorganic functional particles are nano-hydrated ferric oxide or nano-hydrated manganese oxide. The nano-compound adsorbent of the invention has more obvious nano effect, strong reaction activity, great adsorption capacity and high selectivity, well solves the defects of obvious swelling, weak adsorption reaction activity, small adsorption capacity, lower adsorption selectivity and the like of the existing nano-compound adsorbent, and is more suitable for advanced treatment of micro-pollution of water and waste water.

A slurry includes a plurality of particles and at least one selective adsorption additive. The particles are preferably composite particles including a core surrounded by a shell provided by the selective adsorption additive. The slurry can be used to polish a structure including silicon dioxide or a low K dielectric film and a silicon nitride containing film, such as to form a shallow trench isolation (STI) structure or a metal-dielectric structure. The silicon nitride containing film surface substantially adsorbs the selective adsorption additive, whereas the silicon dioxide or low K dielectric film shows non-substantial adsorption characteristics to the adsorption additive. In another embodiment of the invention, silicon dioxide or low K dielectric film shows non-substantial adsorption of the selective adsorption additive at a pressure above a predetermined first pressure, and substantial adsorption of the selective adsorption additive for pressures below a predetermined second pressure, where the first pressure is greater than the second pressure.

The invention discloses a porous metal organic framework material reinforcing methane adsorption separation and preparation and application thereof, the porous metal organic framework material is a supramolecular porous network structural compound prepared from metal ions at least containing CuII and at least one organic compound which can be coordinated with the CuII and at least is provided with two teeth. The CuII-containing porous metal organic framework material can be synthesized by co precipitation, hydrothermal, microwave, ball milling and other different methods, the biggest feature of the porous metal organic framework material is to improve the methane adsorption separation performance by use of effect of weakly polar or nonpolar solvents on the surface in the preparation process of. The CuII-containing porous metal organic framework material has excellent CH4 adsorption selectivity in the separation process of CH4 and N2, the equilibrium adsorption selectivity can reach more than 6, and the material is particularly suitable for use in oil field gas, shale gas, coal seam gas and biogas development and utilization process.

The invention is concerned with the plastic framework-style bentonite composite sorbent and the preparation method. The crude bentonite or the character-changed bentonite is the main material for the composite sorbent, the thermoplastic macromolecule polymer is as the framework connecting material and also add the assistant selective material, the blowing hole-make material by the working procedure such as mixture, model melt extrude, dryness and cut grain. The preparation method is dry preparation method with simple process and without secondary pollution, the product can adjust the powder intensity, the size of the hole, the porosity, the density and the adsorbing selectivity according to the change of the selected group and dosage. The sorbent is not easy pulverization in water which can use for waste water dispose with heavy metal ion and organic infectant.

The invention discloses a preparation method of amidoxime group uranium extraction sorbent, comprising the following steps: firstly, adopting polyacrylonitrile powder as a raw material, producing uranium extraction sorbent containing amidoxime group by amidoximation; adding titanium dioxide sol which is prepared by the sol-gel method for blending to ensure that the weight percent of titanium dioxide and polyacrylonitrile is 0.4-2.0%; producing hybridized amidoxime group uranium extraction sorbent by water washing, alcohol washing and drying. The invention has the advantages that the amidoxime group uranium extraction sorbent material which is hybridized with titanium dioxide has higher mechanical strength, higher adsorption quantity of uranium, and higher adsorption selectivity to uranium in the presence of calcium and magnesium ions.

The embodiment of the invention discloses a polymeric adsorbent and a preparation method thereof. The preparation method comprises the following steps of: preparing a bead-like resin from chloromethyl styrene serving as a polymerization monomer and divinyl benzene serving as a cross-linking agent by a suspension polymerization method; and adding a hydroxyl-containing monomer at the post-crosslinking stage to perform super cross-linking reaction so as to prepare the polymeric adsorbent. In the method, pores are formed in the polymeric adsorbent at the post-crosslinking stage of polychloromethyl styrene by using a chemical modification method, and polar groups are formed on the frame of the polymeric adsorbent by introducing the hydroxyl-containing monomer for modification, so the adsorption of an adsorbent substance by the polymeric adsorbent is increased. The preparation method provided by the invention is simple and the substances harmful to human body such as chloromethyl ether and the like and pore-forming agents are not used in the method. Experimental results show that the polymeric adsorbent prepared by the invention has the advantages of high specific surface area, small aperture, high adsorption selectivity and particularly high capacity of absorbing aromatic compounds.

The invention relates to a method for preparing di-dithiocarbamate modified chitosan beads. The method comprises the following steps of: after dissolving 5 g of chitosan in an acetic acid solution at first, solidifying the chitosan in a sodium hydroxide solution to form chitosan beads with the diameter of 2-3 mm, wherein the solidifying time is 8-26 h; and, after carrying out Shiff alkali reaction, etherification, amination and elimination of benzaldehyde of the chitosan beads, grafting carbon disulfide under an alkaline condition to obtain di-dithiocarbamate modified chitosan. Compared with the original chitosan, the chitosan disclosed by the invention as a water treatment agent has stronger adsorption property and can be applied to treatment of heavy metal ions in wastewater, such as electroplating wastewater, battery wastewater, wastewater in mining industries and the like; the adsorption selectivity of the chitosan is increased; furthermore, the chitosan can be recycled for many times; and the purpose of rationally utilizing resources is achieved.

The invention discloses a spherical cellulose chelate sorbent with amidoxime group and carboxyl group and a preparation method thereof. The average pore size of the spherical cellulose chelate sorbent is 5-40nm, the specific surface area is 160-750m<2>/g, the skeletal density is 0.94-1.45g/ml, the apparent density is 0.35-0.78g/ml, the pore volume is 0.25-1.3ml/g, the water content is 45%-70%, the contents of the amidoxime group and the carboxyl group are respectively 10.6-15.0mmol/g and 0.30-0.80mmol/g. The preparation method comprises the steps of graft copolymerization, saponification and the formation of amidoxime. The spherical cellulose chelate sorbent with the amidoxime group and the carboxyl group of the invention has the advantages of high polarity and excellent special noble metal absorption selectivity, simple and easy preparation method and low manufacturing cost; and the cellulose is an abundant natural renewable material; therefore, the spherical cellulose chelate sorbent with the amidoxime group and the carboxyl group can produce practical economic benefit and environmental benefit on enrichment recovery of the noble metals, etc.

The invention relates to a method for preparing dithiocarbamate-based modified porous starch. The method comprises the steps that: using starch as the raw material; carrying out enzymolysis on the starch for 1 to 26 hours under the condition that the pH is between 4 and 6 and the temperature is between 30 and 60 DEG C by a complex enzyme consisting of a saccharifying enzyme and an alpha-amylase; drying the obtained product to prepare porous starch; and after carrying out crosslinking, etherification and aminating modification on the porous starch, grafting the product with carbon disulfide under the alkaling conndition to obtain the dithiocarbamate-based modified porous starch. Compared with the conventional porous starch, the dithiocarbamate-based modified porous starch of the invention has strong absorption characteristic and high adsorptive selectivity. When the adsorption effect is reduced, the dithiocarbamate-based modified porous starch is taken out and immersed in 2mol.L-1 of HNO3 solution to carry out desorption, the desorption ratio is over 90 percent, and the absorption effect is not reduced by repeated desorption. The invention has commendable economic and social benefits, and can be used for treatment of heavy metal ions in waste water in galvanization, battery and mining industries and the like.

An adsorbing collagen fibre-solidified tannin material for adsorbing and separating metallic ions (Pb, Cd, Hg, Cr and Cu) is prepared from animal skin through preparing collagen fibre membrane or granules, adding the said collagen fibres along with the aqueous solution of tannin to a reactor, reacting at 10-45 deg.c for 6-24 hr, laying aside for 12-24 hr, filtering, washing to remove excessive tannin, adding cross-linking agent, reacting at 20-70 deg.c for 2-8 hr, filtering, washing and drying at 60 deg.c for 12-24 hr. It has very high adsorption selectivity.

The invention discloses a method for removing radioactive cobalt by using a graphene loaded nanometer zero-valent iron composite material, and belongs to the technical field of radioactive waste treatment. The method comprises the following steps: adding the graphene loaded nanometer zero-valent iron composite material into a water sample containing the radioactive nuclide Co, vibrating the mixture at constant temperature, and removing the radioactive nuclide Co after a certain time. The graphene loaded nanometer zero-valent iron composite material used in the method disclosed by the invention can absorb and select the nuclide, is large in adsorption capacity, and less susceptible to desorption; the absorbed particle has the magnetic property, easy to recycle, small in size, and convenient to store temporarily, the experiment condition is mild, and therefore the composite material has an advantage in the aspect of removing the nuclide Co in the radioactive wastewater. The maximal equilibrium adsorption capacity of the graphene loaded nanometer zero-valent iron composite material used in the method disclosed by the invention on Co is 114.08mg/g.

The invention relates to ionic liquid extraction resin capable of realizing high-efficiency recycling of rare earth as well as preparation and an application method of the ionic liquid extraction resin. The ionic liquid extraction resin has a designable zwitterion structural characteristic; the physical and chemical property of the ionic liquid extraction resin can be regulated and controlled by changing the structure or the type of zwitterions, so that the problems of the conventional extraction resin has a single function and the conventional extraction agent is low in stability are solved; and the ionic liquid extraction resin can be used for recycling and separation of rare earth in a solution. According to the preparation method of the ionic liquid extraction resin, syrene anion exchange resin is used as a carrier material, and an acidic phosphine extraction agent is introduced into a syrene-divinylbenzene framework under the action of a non-covalent bond, so that the ionic liquid extraction resin modified by the acidic phosphine extraction agent is obtained. The ionic liquid extraction resin provided by the invention can effectively recycle rare earth ions, is high in adsorption rate and adsorption selectivity to the rare earth ions and can be used for the separation and the recycling of the rare earth in a complicated system.

The invention provides a composite carbon dioxide adsorbent, which includes a silicon-based mesoporous material and organic matter adsorbed in the pores of the mesoporous material and on the surface of the mesoporous material. The pore diameter of the silicon-based mesoporous material is 2-40 nanometers, and its weight percentage in the composite adsorbent is 18%-50%. The invention also provides a preparation method of the composite adsorbent and its application in carbon dioxide adsorption and separation. The preparation process of this kind of composite adsorbent is simple, and it has a large adsorption capacity and high adsorption selectivity for carbon dioxide. The characteristics of organic amines in the process of collecting carbon dioxide are volatile and easy to corrode equipment, which meets the requirements of industrial waste gas treatment.

The invention relates to a method for synthesizing surface molecular engram materials, in particular to a method for preparing phenol molecular engram polymers on the surface of silica gel, which solves the problems in the prior surface molecular engram polymers of low molecular weight of functional macromolecules, low content of functional groups, low grafting percent of engram materials and so on. The method comprises the following steps: firstly, the silica gel is activated, reacts with a coupling agent, and reacts with a polymine aqueous solution; secondly, the surface of the silica gel is chemically grafted with polymine to prepare a grafting material PEI/SiO2; thirdly, the grafting material PEI/SiO2 which absorbs template molecules to be balanced is added into an ethanol aqueous solution of a crosslinking agent for reaction; and fourthly, reacted materials are repeatedly washed by a hydrochloric acid for removal of the template molecules, washed by distilled water to neutralization, and subjected to vacuum drying. The preparation process is simple, and the silica gel surface engram materials prepared have high absorption capacity and superior absorption selectivity on the template molecules, have actuating locus inside silica gel surface polymer films, have small diffusion resistance and quick mass transfer speed, and are easy to achieve absorption equilibrium.

The invention provides a technology for removing sulfides in MTBE by adsorptive distillation. The technology is characterized in that a substance with a boiling point higher than that of MTBE and relatively high absorptive selectivity upon thioether, mercaptan, disulfide and thiophene is adopted as an adsorbent; under certain temperature and technologcial conditions, sulfides in MTBE are selectively absorbed by the adsorbent; and the sulfur-containing adsorbent is regenerated and recycled with a vacuum distillation method, and sulfides are recovered, such that sulfides in MTBE are removed and recycled. With the technology, the content of sulfides in MTBE can be reduced from 600-800ug/g to below 20ug/g, and MTBE target product yield is greater than 99.8%.

The invention relates to a porous carbon composite material for adsorbing CO2 and a preparation method and application thereof. The material comprises the following components in parts by weight: 100 parts of organic precursor, 1-2 parts of catalyst, 0-300 parts of inorganic template agent and 15-200 parts of polyethyleneimine. The organic precursor, the catalyst and the inorganic template agent are mixed and aged, and then the porous carbon composite material for adsorbing the CO2 is obtained after the processes of drying, carbonization, inorganic template agent removal and the loading of the polyethyleneimine. The material is arranged in a fixed bed adsorption tower to adsorb carbon dioxide. Compared with the prior art, the invention has the advantages of high adsorption capacity, high adsorption selectivity, good high-temperature adsorption effect and good absorption-desorption narrow temperature operation, and water has small influence on the adsorption, and even promotes the adsorption of the carbon dioxide.

The invention discloses a process for hypercritical extraction of grape seed oil and resin adsorption abstraction of proanthocyanidin, which comprises, employing hypercritical carbon dioxide to extract grape seed oil from comminuted grape seeds under abstraction pressure of 20-35MPa at 40-50 deg. C, heating degreased grape seeds with 25-35% water solution of ethanol for backflow, charging 50-70% ethanol or isopropanol solution into the concentrated extract liquid, agitating and stewing, decompressing and filtering, thus obtaining proanthocyanidin crude extract liquid, then adsorbing with polystyrene resin, carrying out desorption with desorbent after adsorption saturation, drying the eluent under reduced pressure, finally obtaining refined proanthocyanidin product.

The invention discloses a preparation method of ion imprinted hydroxamic acid chelate resin. According to the invention, propenyl hydroxamic acid is subjected to coordination with imprinting metal ions such as manganese, copper, cobalt, nickel, lanthanum, cerium, yttrium, praseodymium, neodymium, and the like; under the effects of a crosslinking agent and an initiating agent, a propenyl hydroxamic acid-metal ion chelate is polymerized; and the imprinting metal ion is eluted, such that the ion imprinted hydroxamic acid chelate resin is obtained. The method provided by the invention has the advantages of mild reaction condition and high reaction efficiency. The prepared resin has the advantages such as high absorption capacity, high absorption selectivity, and the like.

The invention relates to endotoxin adsorbing material for curing endotoxemia in the bioseparation and the biomedical engineering fields. The adsorbing material which takes sepharose gel as a carrier is coupled with spacer arm molecules through the activating reaction, and then is coupled with two groups of quarternary ammonium salt cations and dewatering molecules as functional groups to be prepared. The adsorbing material is simultaneously coupled with the two groups of functional groups mutually effected with endotoxin, and further the adsorbing selectivity of the adsorbing material to the endotoxin is improved. The physicochemical property of the adsorbing material is steady, and the adsorbing material has good blood compatibility, thereby being able to used for removing the endotoxin in blood plasma, and curing the endotoxemia. The preparation process of the adsorbing material is simple, the preparation cost is low, and the adsorbing material belongs to the novel endotoxin adsorbing material.

The invention relates to anion resin for bilirubin absorption and a preparation method thereof. According to the invention, in the anion resin for bilirubin absorption, styrene is adopted as monomers, divinyl benzene is adopted as a cross-linking agent, maleic anhydride copolymer microspheres and organic small molecules are adopted as a pore-forming agent, and oil dispersible hyperoxide is adopted as an initiating agent; porous microspheres are prepared through suspension polymerization; and the anion resin with preferential bilirubin adsorption ability is obtained through quaternary ammoniation treatment, wherein the theoretical crosslinking degree of the resin is 4-20%, the average pore size of total pores is 80-120nm, and functional groups are quaternary ammonium salt groups. Accordingto the invention, the anion resin with uniform pore sizes, good permeability, good blood compatibility, high preferential adsorption of bilirubins, is obtained, and the problems in the prior art, such as poor absorption selectivity, high prices of imports, and the like, are solved.