247results about "Adsorption purification/separation" patented technology

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 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.

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.

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.

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 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.

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.

The application discloses a method for removing alpha-olefin impurities, which is suitable for raw material refining and reaction circulating agent purification in polyolefin elastomer production. The method comprises the following steps: preparing modified cyclodextrin, using the modified cyclodextrin for refining unit adsorption, realizing deep purification of raw materials and solvents, using ZSM-5 zeolite molecular sieve to construct a fixed bed adsorption column, and efficiently adsorbing and removing internal olefin impurities. In addition, the method can be combined with a rectification process for pre-separation, and then the pre-separated product is further purified through molecular sieve adsorption, so that the circulating utilization is realized. The method for removing alpha-olefin impurities comprises raw material refining, polymerization reaction, devolatilization treatment, extrusion molding and internal olefin removal, and the circulating agent after the impurities are removed can be returned to the refining unit for repeated use. The method has the advantages of simple process, low cost and strong adaptability, improves the internal olefin removal efficiency, effectively controls the impurity content in the polyolefin product, guarantees the product performance, and is suitable for industrial large-scale production.

To provide a process for dehydrogenating normal paraffins derived from natural oils to olefins.SOLUTION: A feed stream is passed through an adsorbent bed comprising alkaline or alkaline earth cation exchange X-zeolite to remove 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.SELECTED DRAWING: Figure 2

The invention discloses a crystalline porous organic molecular framework material POM-OFPDT constructed by non-covalent pi accumulation as well as a preparation method and application of the crystalline porous organic molecular framework material POM-OFPDT. The crystalline porous organic molecular framework material POM-OFPDT constructed by non-covalent pi stacking provided by the invention has a capsule-shaped permanent one-dimensional pore channel in the a-axis direction, has good thermal stability, recyclability and high selectivity, and can effectively realize efficient separation of aromatic hydrocarbons / cycloalkanes.

The present application relates to a kind of paraxylene adsorbent and its preparation method and application, it is related to mixed xylene separation technical field, the active component of the paraxylene adsorbent includes Silicalite-1 molecular sieve;The Silicalite-1 molecular sieve has hydrophobicity, there is no structural defect, contain mesoporous structure at 2.6nm and crystal is the flaky structure of preferential orientation growth along the direction of mass transfer benefit.This application uses this special crystal structure and the Silicalite-1 molecular sieve of morphology as active component, after rolling ball forming, paraxylene adsorbent of spherical shape is made, effectively solve the existing paraxylene adsorbent due to strong water absorption and lead to deactivation, slow adsorption speed and low paraxylene adsorption capacity and other technical problems.

The invention relates to the technical field of separation of ethane and ethylene, in particular to a device and a method for realizing separation of ethane and ethylene. In order to solve the problem that the recovery rate of ethylene is low when ethane-ethylene separation is realized by adopting an ethane selective porous material, the invention provides a novel device for realizing ethane-ethylene separation. Comprising a compressor, a gas inlet buffer tank, an ethylene product flow control valve, an ethylene product gas buffer tank, an ethane product gas buffer tank, a vacuum pump, a plurality of adsorption towers filled with ethane selective porous materials, a plurality of product gas control valves, a plurality of pressure equalizing control valves, a plurality of raw material gas control valves, a plurality of ethane replacement control valves and a plurality of vacuum control valves. By adopting the device disclosed by the invention, the efficient separation of ethane and ethylene can be realized, the demand pressure of ethylene resources is relieved, the continuous treatment of ethane and ethylene mixed gas can be realized, and the treatment efficiency is improved.

The invention provides a method for preparing methane through pyrolysis of medical waste and application of the method, and relates to the technical field of medical waste treatment and energy recovery, and the method comprises the following steps: pyrolyzing the medical waste to obtain pyrolysis gas, purifying the pyrolysis gas, then carrying out steam reforming reaction to obtain reacted gas, separating and purifying the reacted gas to obtain the methane. Methane is obtained; during pyrolysis, the temperature is increased to 190 DEG C to 210 DEG C and kept for 8 min to 12 min, then the temperature is increased to 390 DEG C to 410 DEG C and kept for 13 min to 17 min, and then the temperature is increased to 540 DEG C to 560 DEG C and kept for 30 min to 40 min; the steam reforming reaction catalyst is a lanthanum modified nickel-based catalyst. According to the method, the technical effects of destroying pathogens in the medical wastes, cracking macromolecular organic matters, improving the methane yield and purity and reducing the treatment cost are achieved, and harmless, resourceful and efficient treatment of the medical wastes is realized.

The invention relates to the technical field of sizing agent preparation, in particular to a method for preparing an ASA sizing agent based on enhanced olefin isomerization. Comprising the following steps: step 1, deep pretreatment of alpha-olefin; 2, preparing a composite catalyst; step 3, field-enhanced isomerization reaction; step 4, precisely purifying internal olefin; 5, solvent-free ASA closed-loop synthesis is carried out; and 6, ASA targeted post-treatment: cooling the product in the step 5, adding amino modified graphene to adsorb residual maleic anhydride, filtering, carrying out gradient cooling crystallization on the filtrate according to a set rate, and filtering to obtain a high-purity ASA sizing agent crystal. Through deep pretreatment of the alpha-olefin, the content of heavy metal ions in the straight-chain alpha-olefin can be controlled to be less than or equal to 0.05 ppm, and the content of mercaptan impurities can be controlled to be less than or equal to 0.05 ppm; by combining the design of recycling unreacted alpha-olefin through supercritical CO2 extraction and circulating the unreacted alpha-olefin to the step 1, the consumption of the alpha-olefin raw material can be reduced, and the utilization rate of the raw material is high.

The invention relates to a high-purity ethylene production method and system. The production method comprises the following steps: S1, gasifying: pressurizing an industrial ethylene raw material and gasifying; s2, primary adsorption and purification: feeding the gasified industrial ethylene raw material gas into a primary adsorber for primary purification, and removing H2O, C2H2, CO2 and hydrocarbon impurities above C3 from the raw material gas through the primary adsorber; s3, secondary adsorption and purification: introducing the primarily purified ethylene gas subjected to primary adsorption and purification into a secondary adsorber, and carrying out adsorption-expansion desorption to obtain quasi-high-purity ethylene; s4, entering a multi-stage membrane filtration unit: enabling the quasi-high-purity ethylene subjected to secondary adsorption purification to sequentially penetrate through a plurality of membranes loaded with metal ions, so as to obtain high-purity ethylene; the metal ions are one or a mixture of more of silver ions, cobalt ions, copper ions and titanium ions. Compared with the prior art, the method provided by the invention has the advantages of short flow, low energy consumption, good separation effect, strong process continuity, high product purity and low impurity content, and can meet the production of high-purity ethylene above G5 requirements.

The application discloses a scandium-based MOF crystal material, a preparation method and application thereof. The MOF crystal is formed by [Sc3(mu2-OH)3(CO2)4O6] n The three-dimensional porous framework structure is formed by the mutual connection of an inorganic metal chain, 2,5-thiophene dicarboxylic acid and a nitrate ion, is directly synthesized by a solvothermal reaction with a metal Sc based on the ligand 2,5-thiophene dicarboxylic acid, and has relatively mild, simple and easy reaction conditions. The MOF crystal has high crystallinity, excellent thermal stability, water stability, solvent stability and wide pH stability. Under normal temperature and pressure, C3H6 is preferentially adsorbed, then C2H6, and finally C2H4, and the MOF crystal has good C3H6 / C2H4 and C2H6 / C2H4 separation performance, thereby obtaining high-purity C2H4 and recovering C3H6, and can be applied to the effective separation of C2H4 and C3H6 in a methanol-to-olefin (MTO) mixture.

Processes for producing mono-methyl alkylbenzenes from natural oils are described. The processes includes a linear selective cracking process to crack C14+ chains into C9 to C14 chains which are useful for making linear alkylbenzene for use in detergents and a hydroisomerization step to produce paraffins with mono-methyl branching which can be reacted with benzene to form the mono-methyl alkyl benzenes.

The invention relates to the technical field of adsorption separation, in particular to a sulfur modified adsorbent, a preparation method thereof and an ethylene / ethane adsorption separation method. The sulfur modified adsorbent comprises a carrier and active components, part of the active components are loaded on the surface and / or inside of the carrier in the form of metal sulfide, and the remaining active components are loaded on the surface and / or inside of the carrier in the form of at least one of metal simple substances, metal oxides and metal ions; wherein in the sulfur modified adsorbent, the molar ratio of the active component to the sulfur element in terms of metal elements is (30-170): 1. According to the sulfur-modified adsorbent, the pi complexing action of the sulfur-modified adsorbent and ethylene is optimized by regulating and controlling the chemical environment of the pore channels of the adsorbent, so that the ethylene dynamic adsorption capacity and the ethylene / ethane separation factor of the sulfur-modified adsorbent are improved.