440results about "Adsorption purification/separation" patented technology

The invention relates to a preparation method of a normal-temperature normal-pressure efficient gas adsorption composite material. The method comprises the following steps: firstly, pretreating activated carbon to obtain surface-OH modified mesoporous activated carbon; then modifying the surface-OH modified mesoporous activated carbon with the ZIF-8 material to obtain ZIF-8 (at) OH-AC; and finally, performing surface hydrophobization modification to obtain the adsorption material. Wherein in the modification process, ZIF-8 is firmly loaded and uniformly distributed on the surface of hydroxyl-modified mesoporous activated carbon by adopting an in-situ growth technology, the interface bonding force is enhanced, the loading capacity of the activated carbon on the MOFs material is improved, and by utilizing the chemical adsorption effect of ZIF-8 Zn < 2 + > and methane and the high porosity of the mesoporous activated carbon, the MOFs material can be prepared. The adsorption capacity of the composite material to methane is greatly improved, meanwhile, the moisture resistance of the composite material is effectively improved, the composite material can still keep stable and efficient adsorption performance in a high-humidity environment, and the problem that an existing material is prone to inactivation in a humid environment is solved.

The invention provides an SSZ-13 molecular sieve as well as a preparation method and application thereof, the preparation method comprises the following steps: mixing activated silica-alumina minerals, SSZ-13 seed crystals, a silicon source, a template agent and a second alkali source to obtain dry glue, and then carrying out crystallization treatment on the dry glue in the presence of water vapor to obtain the SSZ-13 molecular sieve. According to the preparation method, a solvent is not adopted, a small amount of deionized water is used for providing a steam phase, the utilization rate of the raw materials can be increased, the high solid yield is obtained, the loss of a solid phase is reduced, no alkaline wastewater is generated, and the synthesis cost of the SSZ-13 molecular sieve is remarkably reduced. When the SSZ-13 molecular sieve prepared by the method is used for CO2 / CH4 adsorption separation, the SSZ-13 molecular sieve has relatively high separation selectivity.

The invention relates to an adsorbent based on an X molecular sieve and preparation and application thereof, and a preparation method of the adsorbent comprises the following steps: (1) mixing the X molecular sieve with a binder, molding and roasting to obtain a molded body; (2) treating the molded body obtained in the step (1) with an alkali solution to perform in-situ crystallization on the binder in the molded body to obtain a crystallized product; (3) carrying out partial barium ion exchange on the crystallized product obtained in the step (2) by using a barium salt solution, and drying to obtain a dried product; (4) carrying out ammonium ion exchange on the dried product obtained in the step (3) by using an ammonium salt solution, and roasting in a flowing atmosphere to obtain a roasted product; and (5) performing barium ion exchange and optional potassium ion exchange on the roasted product obtained in the step (4), and then drying to obtain the adsorbent. The adsorbent has at least two kinds of mesoporous channels with different apertures, has high barium ion exchange capacity, high adsorption capacity and compressive strength, and shows good adsorption selectivity and mass transfer performance when used for adsorption separation of p-xylene.

A method for separating and purifying 4MP1 from a mixture containing 4MTP2 and 1-Hexene comprises the following steps: continuously introducing a solution in which 4MTP2, 1-Hexene and 4MP1 with any concentration are dissolved into a simulated moving bed chromatography system as a raw material solution, collecting a high-purity 4MP1 solution from raffinate of the simulated moving bed chromatography system by adopting a metal organic framework material as a stationary phase, and separating the high-purity 4MP1 solution from the raffinate of the simulated moving bed chromatography system. The extraction liquid is a solution containing impurities 4MTP2 and 1-Hexene. The invention provides a brand new method for separating 4MP1 from 4MTP2 and 1-Hexene, and a complete separation scheme is provided for the prior art; in the separation of high-concentration 4MP1, the relative purity of the separated and purified 4MP1 can reach gt; the recovery rate is gt; and in the separation of low-concentration 4MP1, the rectification level is also exceeded, and the method is more suitable for 4MP1 thermosensitive substances.

The invention relates to the technical field of chemical separation and purification, and discloses a method for separation and purification of taxadiene from tobacco and GC-MSMS quantitative detection.The method for separation and purification of taxadiene from tobacco comprises the following steps that S1, tobacco leaves are made into powder, an extracting agent is added, ultrasonic extraction is conducted for multiple times, and extract liquor is obtained; s2, evaporating the extract to dryness, adding an organic solvent, and dissolving to form a concentrated solution; s3, the concentrated solution is added into a silica gel column for gradient elution, and an extraction sample is obtained; and S4, evaporating the extracted sample to dryness, adding acetonitrile for dissolving, and carrying out secondary recrystallization to obtain purified taxadiene. According to the method, the efficiency and purity of separating the taxadiene from the tobacco are improved, and the taxadiene is accurately quantified.

The invention relates to the field of acetylene purification and new materials, and particularly provides a double-interspersed MOF (Metal Organic Framework) and a preparation method and application thereof in acetylene purification, and the specific synthesis method comprises the following steps: reacting a tricarboxylic acid ligand 1, 3, 5-tris (4-carboxylphenyl) benzene (H3btb) with a nitrogen-containing methyl-containing ligand 3-methyl-1H-1, 2, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3-tetramethyl-1 The MOF (Zn-btb-fmtrz) with ultrahigh stability performance is synthesized from 2, 3, 4-triazole (fmtrz) and a zinc-containing compound, and the material can be used as an adsorbent, has strong acetylene adsorption action force, high selectivity and good stability, is suitable for industrial production, and shows a more excellent separation effect on low-concentration acetylene compared with a traditional method. The synthesized material is stable and has good acetylene adsorption capacity, and a new direction is provided for using MOF as an acetylene purification material.

The present invention relates to an X molecular sieve-based adsorbent. The adsorbent comprises at least 92 wt% of an X molecular sieve, and has a micropore volume of 0.18-0.30 mL / g and a mesopore volume of 0.01-0.1 mL / g. A pore size distribution curve of the adsorbent shows at least two mesopore distribution peaks, wherein the most probable pore size corresponding to one mesopore distribution peak ranges from 3.0 to 9.0 nm, and the most probable pore size corresponding to the other mesopore distribution peak ranges from 10.0 to 19.0 nm. The present invention further relates to a preparation method for the adsorbent, a use of the adsorbent, and a device comprising the adsorbent.

The invention relates to the field of oxygen-containing compound adsorption and removal, and discloses a molecular sieve adsorbent as well as a preparation method and application thereof. The method comprises the following steps: mixing a silicon source and an aluminum source, carrying out preliminary crystallization, aging and crystallizing in a gel-like mother solution containing the silicon source and the aluminum source to obtain an FAU molecular sieve seed crystal, and carrying out mixed crystallization on the FAU molecular sieve seed crystal, various molecular sieves and the aluminum source, forming and roasting the obtained molecular sieve mixed crystal, the sodium metaaluminate modified carbon nanotube, an aluminum source and an auxiliary component; and finally, carrying out surface modification by adopting anhydrous amino acid ionic liquid. The molecular sieve adsorbent has a hierarchical pore structure composed of abundant micropores and mesopores and a relatively high specific surface area, the adsorption performance is improved through modification of the amino acid ionic liquid and addition of the modified carbon nanotubes, and when the molecular sieve adsorbent is used for adsorbing and removing oxygen-containing compounds in olefins, the molecular sieve adsorbent shows a relatively good removal rate and a relatively long adsorption period, and the molecular sieve adsorbent has relatively good application prospects. The production cost can be effectively reduced, and the method has high production and application value.

The invention discloses a process for adsorbing and separating ethane by using catalytic dry gas, and aims to solve the technical problems that in the prior art, the ethane adsorption effect is relatively poor, an adsorbent is not easy to regenerate, the chemical stability is relatively poor, next adsorption can be carried out only after desorption is completed after adsorption saturation, and the working efficiency is low. The process comprises the following steps: S1, pretreating dry gas; s2, preparing an adsorbent; and S3, the dry gas pretreated in the S1 is pressurized to the pressure condition required by the process through a compressor, and then the dry gas is cooled through circulating water and low-temperature refrigerant water in sequence. According to the process, the adsorbent is prepared by loading copper chloride on activated carbon, the prepared adsorbent has a better adsorption effect on ethane, the adsorbent can be regenerated and is good in chemical stability, and through the design of the two adsorption beds, one adsorption bed performs desorption while the other adsorption bed performs adsorption operation; and continuous adsorption and desorption operation can be realized, and the working efficiency is higher.

Processes for dehydrogenating normal paraffins derived from natural oils to olefins are described. The feed stream is passed through an adsorption bed comprising alkaline or alkaline earth cation exchange X-Zeolite to removes essentially all oxygenates and aromatics from the feed stream. One or more additional adsorbent beds having different adsorbents can also be included to remove additional oxygenates and aromatics as well as sulfur compounds, nitrogen compounds, phosphorous compounds, or combinations thereof. The dehydrogenation process can be part of a process for producing alkylbenzenes from natural oils.

The application discloses a flexible metal organic framework material with molecular sieve-like separation performance and a preparation method and application thereof, and preparation of the flexible metal organic framework material comprises the following steps: a copper hexafluorosilicate solution is added drop by drop into a 3,5,3,5-tetramethyl-1H,1H-[4,4]bipyrazole solution in an ice water environment, after dropping, the reaction is stirred for 10-15 hours in the ice water environment, and the obtained reaction solution is subjected to post-treatment to obtain the flexible metal organic framework material [Cu(bpz)(SiF6)] with molecular sieve-like separation performance. The framework material has a great adsorption difference for C2H2 and CO2, can be used for separating C2H2 / CO2 mixed gas, has very high separation selectivity, has a large adsorption capacity for C2H2, and is a solid physical adsorbent with both characteristics.

The application discloses a process for converting broken hair into methane and relates to the technical field of energy conversion, and comprises the following steps: hair pretreatment, hair crushing and screening, raw material mixing and catalyst adding, anaerobic fermentation reaction, and methane separation and purification. Compared with the prior art, the process has the advantages of rich raw materials, environmental protection, high conversion efficiency, high product quality and strong controllability.

The invention relates to the technical field of adsorption materials, in particular to modified adsorption resin for a high-impurity n-heptane raw material and a purification method of the modified adsorption resin. The resin is prepared from the following raw materials: polystyrene-divinylbenzene resin microspheres, chloromethyl ether, 1, 3, 5, 7-tetra (4-chloromethylphenyl) adamantane, 2-methylimidazole and the like. During preparation, polystyrene-divinylbenzene resin microspheres are subjected to chloromethylation to introduce active sites, adamantine crosslinking to construct rigid pore channels, and imidazolyl functionalization to introduce specific adsorption sites. During purification, dynamic adsorption is performed after pretreatment of two stages of adsorption columns, mild regeneration is performed by using an ethanol-acetone mixed solution, isoparaffin, aromatic hydrocarbon and oxygen-containing compounds can be synchronously removed, high-purity n-heptane is obtained, the resin regeneration performance is excellent, and the whole process is easy to industrialize.

The utility model relates to the technical field of petrochemical engineering, in particular to a p-diethylbenzene recovery system which comprises a p-diethylbenzene collecting tank, an air cooler, a p-diethylbenzene tank area, a steam heat exchanger, a carclazyte tower and a circulating pipeline, an outlet header pipe of the p-diethylbenzene collecting tank is connected to a p-diethylbenzene tank area through a first branch pipeline, the air cooler is arranged on the first branch pipeline, and the p-diethylbenzene tank area is sequentially connected with a steam heat exchanger and a carclazyte tower through a tank area outlet pipeline. An outlet of the carclazyte tower is connected to a p-diethylbenzene system through a p-diethylbenzene external supplement pipeline, an outlet sampler is arranged on the p-diethylbenzene external supplement pipeline, and the p-diethylbenzene external supplement pipeline is connected to an inlet of a p-diethylbenzene collecting tank through a circulating pipeline. According to the utility model, the outlet sampler is arranged at the outlet of the carclazyte tower, the treated diethylbenzene is sampled and detected, the diethylbenzene is circularly treated through the circulating pipeline, and after the diethylbenzene is monitored to be qualified, the diethylbenzene is merged into the system, so that the system is prevented from being polluted.

A process for separating 1-butene from a C4 raffinate gas composition includes introducing the C4 raffinate gas composition to a reactor containing an adsorbent material and passing the C4 raffinate gas composition through the adsorbent material; adsorbing the 1-butene from the C4 raffinate gas composition onto the adsorbent material to separate the 1-butene from the C4 raffinate gas composition and form a residue gas composition; and desorbing the 1-butene by heating the adsorbent material after the adsorbing to form the 1-butene and regenerate the adsorbent material. The adsorbent material is at least one of a zeolite adsorbent and an alkali-modified zeolite adsorbent having at least 99% by weight selective towards 1-butene for adsorption in comparison to iso-butene and iso-butane.

The invention discloses a method for preparing industrial hexane with ultralow benzene content through pre-hydrogenation. The method comprises the following steps: light naphtha, hydrogen and a hydrogenation catalyst are subjected to a hydrogenation reaction in a hydrogenation reactor for desulfurization and dearomatization, and a first mixture is obtained; feeding the first mixture into a gas-liquid separator to respectively obtain a liquid-phase product and a hydrogen-containing gas-phase product, and separating hydrogen from the gas-phase product through a circulating hydrogen compressor for recycling; and sequentially carrying out second rectification and third rectification on the liquid-phase product to obtain a heavy component substance, and adsorbing the heavy component substance through a molecular sieve. According to the method, by means of front hydrogenation reaction and rear molecular sieve adsorption, on one hand, the reaction load of molecular sieve adsorption is greatly reduced while the reaction activity of the hydrogenation reaction is improved; on the other hand, an extracting agent does not need to be added, other gas-phase and liquid-phase components are not introduced except hydrogen, the preparation process is greatly simplified, and the benzene content in the obtained cyclohexane is smaller than 5 ppm.

The present invention discloses a molecular sieve with a point screening structure, a preparation method thereof, and an application thereof in the adsorption separation of propylene and propane. The molecular sieve of the present invention is composed of 1,2-ethanedisulfonate anion, 4,4'-dipyridyl sulfide and Cu 2+ Formed by coordination bonds, chemical formula [MSL2] ∞ , where M represents Cu 2+ , S represents 1,2-ethanedisulfonate anion, L represents 4,4'-dipyridyl sulfide, and ∞ represents that the molecular sieve is formed by several structural units composed of MSL2 and expanded in space; the molecular sieve of the present invention has local point-like pore contraction. Preparation method: Cu 2+ A molecular sieve having a point-sieving structure is prepared by mixing a source, 1,2-ethanedisulfonate, and 4,4'-dipyridyl sulfide in a reaction solvent. The present invention has outstanding advantages such as good material stability, high adsorption selectivity, high adsorption capacity, high adsorption rate, and easy regeneration, and has good industrial application prospects.

This application relates to the field of organic synthesis technology, specifically disclosing a process for preparing tert-butyl vinyl ether. The raw materials include solid tert-butanol, acetylene, tetrahydrofuran solvent, and potassium hydroxide catalyst, supplemented with auxiliary materials such as type 3A molecular sieves and activated alumina adsorbents. The preparation method involves: after dehydration and purification of the raw materials, the materials are introduced into a reaction vessel; temperature and pressure are controlled, and the reaction endpoint is monitored using an infrared spectrometer; byproducts are quenched and acetylene is recovered; the process involves multi-stage condensation, water washing to remove impurities, distillation separation, and solvent purification and recycling, with simultaneous integration of waste heat recovery and continuous material feeding. The tert-butyl vinyl ether prepared by this process, as an important fine chemical intermediate, can be used in coatings, adhesives, and polymer material modification, possessing advantages such as high purity and good stability. The preparation method achieves efficient utilization of materials and energy through multi-stage synergistic linkage, combining the advantages of green environmental protection, continuous and stable operation, and high resource utilization.

The invention belongs to the technical field of natural gas treatment, and discloses a process and a system for recovering ethane and other light hydrocarbon components from oilfield associated gas. A washing tower is arranged before dehydration, heavy hydrocarbon components in the oilfield associated gas are removed, the influence of the heavy hydrocarbon components on a molecular sieve dehydration device is reduced, the service life of a molecular sieve is prolonged, and a liquid phase separated by a low-temperature separator is cooled by a cold box to be cooled and throttled to enter the top of a demethanizing tower; and the low-temperature freezing blockage influence of the carbon dioxide component on the demethanizer can be well reduced.

The invention discloses a modified MOF material, an adsorbent, a method for purifying linear alpha-olefin and an ethylene oligomerization method, and belongs to the technical field of metal organic material preparation. The preparation method of the modified MOF material comprises the following steps: heating a mixture containing the MOF material, carbohydrate and palladium on carbon in an inert atmosphere to obtain the modified MOF material. According to the method, the modified MOF material is used as an adsorbent, olefin or alkane containing a ring structure can be removed under a mild condition, the purpose of purifying linear alpha-olefin is achieved, the modified MOF material can be reused, and the method has good economic benefits and practical application value.

Disclosed are apparatuses and processes for preparation and conversion comprising / using: a fractionation chain (4-6) that produces a xylene fraction (24); a xylene separation unit (10) that treats the xylene fraction to produce a para-xylene extract (39) and a raffinate (40); an isomerization unit (11) treating the raffinate to produce an isomerization product (42) of xylenes fed to the fractionation chain; the synthesis gas production unit (14; 15) that treats the hydrocarbon feedstock (30) to produce a synthesis gas (34) containing CO and CO2; a methanol synthesis reaction section (50) that treats the synthesis gas (34) to produce methanol (51); a toluene alkylation reaction section (13) treating the toluene-containing fraction (23) with methanol (51) to produce an alkylation effluent (32) containing xylene and fed to the fractionation chain.

A portable pressure swing adsorption method and system for fuel gas conditioning. A fuel gas conditioning system includes a pressure swing adsorption (PSA) system fluidly coupled to a rich gas stream, the PSA system including a plurality of adsorbent beds and configured to condition the rich natural gas stream and produce therefrom a high-quality fuel gas and gaseous separated heavier hydrocarbons, a product end of the adsorbent beds fluidly coupled to a fuel gas line, wherein the high-quality fuel gas is discharged from the product end and supplied to the fuel gas line, and a feed end of the adsorbent beds configured to be fluidly coupled to the rich natural gas stream or a raw natural gas stream, wherein the produced gaseous separated heavier hydrocarbons are recirculated into the rich natural gas stream or the raw natural gas stream.

The utility model discloses an acetylene pressure swing adsorption recovery device, including the recovery organism, the corner position of recovery organism outer wall all is equipped with the vertical frame, and the top of recovery organism is installed the machine cover, and the upper end fixed in recovery organism is equipped with the baffle, and the bottom of baffle is installed a plurality of filter drums, and the central position of filter drum top all is equipped with the cylinder mouth, and the outside of a plurality of filter drums is equipped with the scraper, and the top of scraper and the bottom of baffle touch, and the both sides inner wall on the bottom of recovery organism all are installed first elevating drive through support, and the top of first elevating drive and the bottom of scraper are connected, and the below of filter drum all is equipped with the lower baffle, and the top of lower baffle and the bottom of filter drum touch, and the outside of one side of recovery organism is equipped with the gas injection valve pipe. The utility model not only guarantees the adsorption recovery effect of acetylene when using the recovery device, but also improves the convenience when using the recovery device, and can classify and collect according to the quality of acetylene adsorption particle discharge.

A method for upgrading biogas comprising methane and nitrogen, where the biogas is provided in at least one pressurized vessel at a pressure of at least 65 atm (6586 kPa). The method includes a pressure swing adsorption (PSA) cycle having a feed phase, where biogas is fed into a first adsorbent bed when the inlet end is open and the outlet end is closed, followed by a first depressurization phase, where a gas enriched in methane is withdrawn through the outlet end with the inlet end being closed. This gas enriched in methane can be pipeline quality and at pipeline pressures. A methane recovery phase is provided, which can improve methane recovery, wherein gas is withdrawn and the pressure drops to one or more lower values, and where this gas can be recycled for use in the feed phase, used in a regeneration phase, and / or fed to a second bed.

The invention discloses application of a pillared metal organic framework material in adsorption and separation of xylene isomers. Wherein the pillared metal organic framework material is used as an adsorbent to adsorb and separate mixed gas containing xylene isomers, the pillared metal organic framework material comprises metal ions and ligands, the ligands comprise main ligands and pillared ligands, the main ligands are selected from C6-C10 aromatic ring dicarboxylic acids containing or not containing substituent groups, the pillared ligands are selected from C6-C10 aromatic ring dicarboxylic acids containing or not containing substituent groups, and the pillared ligands are selected from C6-C10 aromatic ring dicarboxylic acids containing or not containing substituent groups. The substituent group is selected from one or more of C1-C5 alkyl groups, halogen, C1-C5 halogenated alkyl groups, amino groups, hydroxyl groups, cyano groups and C1-C5 alkoxy groups. The metal organic framework material provided by the invention is good in stability, developed in pore structure, large in BET (Brunauer, Emmett and Teller) specific surface area, high in adsorption capacity and high in adsorption separation selectivity when being applied to adsorption separation of xylene isomers.

A contaminant removal device may be configured to transport a contaminant to an ionic liquid sorbent or from the ionic liquid sorbent. The contaminant removal device may include a housing include a liquid inlet configured to introduce the ionic liquid sorbent into the housing. The contaminant removal device may further include a packed bed configured to receive the ionic liquid sorbent and rotate about a device axis to centrifugally force the ionic liquid sorbent through the packed bed.

The application mixes NaX type molecular sieve with kaolin mineral as a binder, then rolls into a ball, calcines at high temperature, converts kaolin into metakaolin, then treats with alkali, converts into X type molecular sieve in situ, then ion exchanges to prepare high selective adsorbent. The prepared adsorbent has high trimethylbenzene adsorption selectivity, compression strength and bulk density.

The invention discloses an adsorbent for removing methanol from liquid hydrocarbon as well as a preparation method and application of the adsorbent, belongs to the technical field of liquid hydrocarbon dealcoholization, and can effectively remove methanol from liquid hydrocarbon through combination of active adsorption species and a porous carrier in a specific proportion. The mass loading amount of the active adsorption species is in the range of 5-50%, enough adsorption capacity is ensured, meanwhile, the stability and mechanical strength of the adsorbent are kept, the adsorbent can effectively adsorb methanol in liquid hydrocarbon, the technical problem that the methanol content in the liquid hydrocarbon is high, and consequently products such as ethane, liquefied petroleum gas and stable light hydrocarbon contain methanol is solved, and the method is suitable for industrial production. The adsorbent with excellent methanol removal performance can be efficiently prepared through simple preparation steps including dissolving, mixing, drying by distillation under reduced pressure and drying. The method is low in cost and easy for industrial production, and the liquid hydrocarbon raw material containing trace methanol is treated by the solid adsorbent bed layer, so that methanol can be efficiently removed, and a liquid hydrocarbon product meeting requirements is obtained.

A portable pressure swing adsorption system and method for fuel gas conditioning. A fuel gas conditioning system includes a pressure swing adsorption (PSA) system fluidly coupled to a compressed rich gas stream, the PSA system including a plurality of adsorbent beds and configured to condition the compressed rich natural gas stream and produce therefrom a high-quality fuel gas and gaseous separated heavier hydrocarbons, a product end of the adsorbent beds fluidly coupled to a fuel gas line, and a feed end of the adsorbent beds configured to be fluidly coupled to the compressed rich natural gas stream or a raw natural gas stream, wherein the produced gaseous separated heavier hydrocarbons are desorbed at at least 50 psia and recirculated into the rich natural gas stream or the raw natural gas stream without post-desorption compression.