1616results about How to "Improve adsorption capacity" patented technology

The invention belongs to the field of biochar adsorbing materials, and relates to a method for preparing modified biochar with aquatic plant waste and hematite. The method includes the following steps: (1) naturally drying aquatic plants prior to crushing to obtain aquatic plant powder; (2) crushing the hematite to obtain hematite powder; (3) weighing the hematite powder prior to putting the hematite powder into deionized water, and performing ultrasonic treatment to obtain suspension; (4) weighing the aquatic plant powder, soaking the aquatic plant powder in the suspension, and stirring and drying to obtain fully mixed aquatic plant and hematite mixture; (5) weighing the fully mixed aquatic plant and hematite mixture, putting the mixture in a batch-type atmosphere furnace, and feeding nitrogen into the furnace; performing temperature programming to the target temperature, and maintaining final-temperature pyrolysis; after the pyrolysis process is finished, obtaining the target product, namely the modified biochar. The modified biochar has strong adsorbability in nitrate and phosphate, high in stability and reusable.

This invention relates to a highly efficient functional ceramsite for purifying phosphorus-containing wastewater, its preparation method, and its application. Based on a complementary functional strategy, it uses natural clay rich in Al2O3 and SiO2 as a binder and calcium-rich industrial solid waste as the calcium-rich active component. Functional additives are also added to mitigate pH changes caused by calcium oxide reactions. The above raw materials are calcined at high temperature to obtain inexpensive, calcium-rich functional ceramsite with high mechanical strength, large adsorption capacity, and ecological safety. This effectively solves the common problems of increased water pH and poor phosphate adsorption capacity at neutral pH in calcium-based ceramsite, achieving highly efficient phosphorus purification in water. This invention uses inexpensive and readily available natural clay and calcium-rich industrial solid waste as raw materials, resulting in low cost, good effect, and effective application in the treatment of low-pollution water.

The invention relates to the technical field of stainless steel pipe fittings, in particular to a high-performance anti-corrosion stainless steel pipe fitting and a preparation method thereof.The preparation method of the high-performance anti-corrosion stainless steel pipe fitting comprises the following steps that S1, mechanical polishing is conducted; s2, removing oil; s3, acid treatment is conducted, specifically, the stainless steel pipe fitting blank obtained after oil removal is soaked in an acid surfactant solution for 5-10 min, and the stainless steel pipe fitting blank is taken out, washed with water and dried; the solute in the acidic surfactant solution comprises acid and a cationic surfactant; s4, adsorption treatment is conducted, specifically, the stainless steel pipe obtained after acid treatment is soaked in an adsorption solution containing graphene oxide for 4-10 min, and the stainless steel pipe is taken out and dried; and S5, anti-corrosion coating treatment is conducted, specifically, anti-corrosion coating is sprayed to the surface of the stainless steel pipe fitting blank, drying is conducted, and the high-performance anti-corrosion stainless steel pipe fitting is obtained. The method has the advantage that the anti-corrosion performance of the organic anti-corrosion coating can be improved.

The application discloses a kind of nano magnetic flocculants and its preparation method and application, belong to drinking water processing technical field, including the following steps: step S1, modified ferroferric oxide nanosphere is ultrasonically dispersed in ammonia alcohol solution, while stirring, slowly drop adding tetraethyl orthosilicate, continue stirring after drop, after centrifugal separation, wash, obtain silica coated ferroferric oxide nanoparticles;Step S2, phenylalanine modified chitosan is added into glacial acetic acid solution, after completely swelling and dissolving, add silica coated ferroferric oxide nanoparticles and ultrasonic treatment, under low pressure ultraviolet lamp, then with anhydrous ethanol wash purification, vacuum drying to constant weight, obtain nano magnetic flocculants;The method of the application is simple and easy to operate, the nano magnetic flocculants prepared can be quickly adsorbed to the surface of sulfonamide antibiotics, produce flocculation and can be magnetically separated, very suitable for trace sulfonamide antibiotics in drinking water source efficient removal.

The invention provides traditional Chinese medicine fermented disaccharide encapsulated nano anti-dandruff, hair-growing and oil-controlling shampoo and a preparation method, and relates to the field of daily chemical products, and the shampoo comprises the following components: a compound fermentation product, lactobacillus crispatus, lactobacillus plantarum, a disaccharide activity protection system, a basic component and a nano oil-controlling component; the compound leavening is prepared from cacumen biotae, radix polygoni multiflori, radix ginseng, fructus cnidii and orchid; the disaccharide activity protection system comprises maltotetraose and trehalose; the disaccharide activity protection system wraps a fermented material formed by fermenting the compound fermentation product, the lactobacillus crispatus and the lactobacillus plantarum to form a disaccharide glassy state layer; the nano oil control component is prepared from calamine powder and chitosan-sodium alginate; the basic component is prepared from tea bran, radix sophorae flavescentis, herba ecliptae, radix notoginseng, fructus ligustri lucidi, tea saponin microcapsules and tremella polysaccharide. According to the invention, through fermentation conversion of the orchid, disaccharide glassy state protection and slow release of the nano calamine, activity enhancement, stable retention and accurate release are realized, and the effects of removing dandruff, relieving itching, controlling oil and growing hair are achieved.

The invention discloses a preparation method and application of an iron-doped molybdenum disulfide / polymer-based composite solid-state electrolyte, and relates to the technical field of solid-state batteries. After the iron element is doped, defects are introduced into the structure of the modified molybdenum disulfide, phase change is induced, dissociation of the lithium salt is promoted through synergism of the modified molybdenum disulfide and the iron element, and more free lithium ions are released; and meanwhile, the proportion of an amorphous region of the polymer electrolyte is increased, so that the ionic conductivity is improved, and the oxidation resistance is enhanced. In addition, the iron-doped molybdenum disulfide can effectively catalyze decomposition of lithium salt anions, and construction of a uniform and stable solid electrolyte interface (SEI) layer on the surface of the electrode is facilitated. The all-solid-state lithium metal battery assembled based on the modified solid electrolyte shows excellent electrochemical performance.

This invention discloses a method for preparing a heavy metal ion adsorbent, the heavy metal ion adsorbent itself, and its applications. The preparation method includes the following steps: obtaining a mixture of steel slag and red mud; adding water to the mixture obtained in the above step and wet-milling it using a ball mill to obtain slurry 1; introducing CO2 gas into slurry 1 under stirring conditions to carbonize the modified porous framework particles in slurry 1 to obtain slurry 2; and filtering slurry 2 to obtain a solid, washing the solid until the pH is neutral, and drying it to obtain the heavy metal ion adsorbent. This invention uses two industrial solid wastes, steel slag and red mud, as reaction raw materials, resulting in low cost. It prepares a porous adsorbent material loaded with nano-calcium carbonate at room temperature, exhibiting high adsorption efficiency, and realizing high-value utilization of steel slag and red mud for wastewater treatment.

The invention discloses a silver-coated copper powder preparation method based on nickel layer enhanced palladium catalysis and active hydrogen synergistic deposition, and relates to the technical field of powder surface treatment. The method specifically comprises the following steps that copper powder is soaked in acid liquor, then filtering, washing and drying are conducted, and pretreated copper powder is obtained; immersing the pretreated copper powder into a hydrochloric acid solution of nickel chloride hexahydrate, and then filtering, washing and drying to obtain sensitized copper powder; immersing the sensitized copper powder into a hydrochloric acid solution of palladium chloride, and then filtering, washing and drying to obtain activated copper powder; mixing the activated copper powder with the reduction solution to obtain a solid-liquid mixture, adding a silver-ammonia solution into the solid-liquid mixture, heating for reaction, and filtering after the reaction is finished to obtain a solid product; and washing and drying the solid product to obtain the silver-coated copper powder based on nickel layer enhanced palladium catalysis and active hydrogen synergistic deposition. The silver-coated copper powder with a compact silver layer and high binding force is prepared through the ternary synergistic effect of nickel layer sensitization, palladium nanometer activation and formaldehyde reduction.

The invention relates to the technical field of photocatalytic processes, in particular to a catalyst for preparing methanol through photocatalytic reduction of CO2 as well as a preparation method and application of the catalyst. The catalyst comprises a composite carrier and active sites dispersed on the surface or in pores of the composite carrier, the composite carrier is of a heterojunction composite structure formed by a hollow TiO2 sphere and MCN, the hollow TiO2 sphere comprises a shell layer and a spherical cavity structure located in the shell layer, the shell layer is formed by TiO2 nanoparticles, and the MCN has a mesoporous pore structure; a II-type or Z-type heterojunction interface is formed between the hollow TiO2 spheres and the MCN through physical contact and chemical action; the active sites comprise copper nano species, sulfur vacancy defects and amino groups; the copper nano species are copper nano particles or clusters, and the valence state of copper is 0 and / or + 1 valence amino is grafted on the surface of the composite carrier through an organic long chain. The catalyst provided by the invention can greatly improve the yield and selectivity of methanol prepared by photocatalytic reduction of carbon dioxide.

The present invention belongs to the field of lithium extraction, and specifically relates to a H 1.6 Mn 1.6 O4@H2TiO3 composite lithium ion sieve, comprising H 1.6 Mn 1.6 O4 with a porous structure, and H2TiO3 embedded in the pore structure and surface-coated in H 1.6 Mn 1.6 O4. The present invention also includes the preparation of the material and its application in lithium extraction. The material described in the present invention has excellent lithium extraction capacity and cycle stability.

This invention discloses a method for enhancing the recovery of fine-grained titanium ore, belonging to the field of fine-grained titanium ore beneficiation technology. The steps include: (1) pre-enrichment; (2) preparation of modified collectors; (3) desulfurization; (4) multi-dimensional interface-controlled flotation; and (5) deep quality improvement. This invention, by adding a highly efficient activator, interacts with the surface of ilmenite to oxidize more ferrous ions to ferric ions, thereby increasing the number of active adsorption sites of the collector. Simultaneously, it modifies existing unsaturated fatty acid collectors, thereby increasing their dispersion, dissolution, and adsorption capabilities. Under the combined effect of these two factors, the flotation grade and recovery rate of fine-grained ilmenite are significantly improved, achieving the goal of enhancing the recovery of fine-grained titanium ore. The fine-grained titanium ore recovery method provided by this invention not only obtains qualified titanium concentrate, but also features flexible process implementation, low cost, small wastewater treatment volume, and no secondary pollution.

This invention provides a maltodextrin with good encapsulation performance and moisture resistance, and its preparation method. This invention belongs to the field of food processing technology. The preparation method of the maltodextrin with good encapsulation performance and moisture resistance provided by this invention includes the following steps: (1) adding 4-α-glycosyltransferase to a waxy cassava starch slurry for a first-stage enzymatic hydrolysis, inactivating the enzyme, and obtaining a waxy cassava starch slurry; (2) after heat preservation treatment of the waxy cassava starch slurry, adding a heat-resistant starch branching enzyme solution for a second-stage enzymatic hydrolysis, inactivating the enzyme, and obtaining a macrocyclic dextrin slurry; (3) centrifuging the macrocyclic dextrin slurry to remove impurities, freeze-drying, and obtaining maltodextrin with good encapsulation performance and moisture resistance. The maltodextrin prepared by the method of this invention has good encapsulation and adsorption performance, extremely high water solubility and slow digestion characteristics, and also has the advantages of low viscosity, high transparency, non-retrogradation, strong freeze-thaw stability, and good moisture resistance.

This invention discloses a method for preparing and applying a fully biomass-based hemoperfusion adsorbent material, belonging to the field of functional polymer materials. The preparation method includes the following steps: preparing regenerated cellulose microspheres from a cellulose solution using a sol-gel conversion method; mixing the obtained regenerated cellulose microspheres with a phase change lysozyme solution and then incubating to obtain phase change lysozyme-coated regenerated cellulose microspheres, which is the fully biomass-based hemoperfusion adsorbent material of this invention. The phase change lysozyme coating of cellulose in this invention not only improves the biocompatibility of the cellulose adsorbent material but also significantly enhances its adsorption capacity for bilirubin. The fully biomass-based hemoperfusion adsorbent material of this invention can be used as a bilirubin adsorbent for hemoperfusion adsorption of bilirubin in blood.

This invention discloses a muscle-relaxing and meridian-clearing health powder and its preparation and application methods, belonging to the technical field of traditional Chinese medicine external health care products. The health powder is composed of fifteen raw medicinal materials: safflower, angelica, asarum, kudzu root, red peony root, scutellaria, dragon's blood, saposhnikovia root, frankincense, myrrh, cinnamon twig, mugwort leaf, coptis root, *Lycopodium clavatum*, and *Clematis armandii*. These materials are dried, pulverized to 80-120 mesh, and then evenly mixed. This invention, through a unique formulation design, integrates multiple effects such as promoting blood circulation and removing blood stasis, dispelling wind and cold, relieving muscle tension and clearing meridians, and clearing heat and drying dampness. Combined with a refined pulverization process, it significantly improves the dissolution rate and transdermal absorption efficiency of the drugs. During use, a hot compress applied via steam allows the medicinal properties to directly reach the affected area, effectively relieving pain and discomfort in the neck, shoulders, waist, legs, and joints. This invention's product has a scientific formulation, advanced technology, is convenient to use, and highly safe, possessing broad market application prospects.

The utility model provides a dual-purpose anti-leakage enema and excrement collecting device. The dual-purpose anti-leakage enema and excrement collecting device comprises an enema bag, an infusion tube, an exhaust tube, an excrement collecting tube, an exhaust assembly and an anti-leakage assembly. The infusion tube is fixedly connected to the bottom of the enema liquid bag; the exhaust pipe is communicated with the outer wall of one end of the infusion pipe; the excrement collecting tube is communicated with the outer wall of the other end of the infusion tube; the exhaust assembly is arranged on the exhaust pipe; and the anti-leakage assembly is arranged on the infusion tube. According to the dual-purpose anti-leakage enema and excrement collecting device, through the structural design of the enema bag, the infusion tube, the exhaust tube, the excrement collecting tube, the exhaust assembly and the anti-leakage assembly, the enema function and the excrement collecting function are well combined, when enema is conducted on a patient suffering from abdominal distension, gas in the intestinal tract can be conveniently exhausted, leakage in the enema process is reduced, and the enema effect is improved. Leakage can be conveniently adsorbed, and the enema effect is good.

The utility model relates to the field of construction safety, concretely relates to a kind of for safety belt collocation multi-point adsorption type safety fixing device, including main frame, sucking disc, pressure outlet, pressure ware, power, connecting buckle, connecting rope, hook, alarm, the sucking disc evenly distributes in the bottom of the main frame, the pressure outlet is set in the side of one vertex of the main frame, the connecting buckle is set in the front of the main frame, the connecting rope connects the connecting buckle and hook, the pressure ware is set in the main frame and is connected with the sucking disc, the power is electrically connected with the alarm, pressure ware, after sucking disc and adsorption operating surface contact, the pressure ware empties the gas in the sucking disc by the pressure outlet. The adsorption, illuminating property, convenience, safety of the device provide better security guarantee for the safety of worker in construction site, more convenient in construction process, improve the safety index of construction site.

This invention discloses a magnetic solid-phase extraction method for detecting trace amounts of glucocorticoids in hydrophilic media, belonging to the field of sample pretreatment and chromatographic analysis technology. The method includes: adjusting the pH of a hydrophilic medium sample containing glucocorticoids and adding an ionic strength modifier to obtain a pretreated sample; mixing a magnetic covalent organic framework-based composite nanomaterial with the pretreated sample and performing oscillatory extraction under a dynamic gradient magnetic field to adsorb the glucocorticoids onto the material surface; separating the material adsorbed with glucocorticoids using an external magnetic field and discarding the supernatant; performing ultrasonic-assisted elution of the material using an elution solvent and collecting the eluent; and detecting the eluent using high-performance liquid chromatography-diode array detector (HPLC-DID) and calculating the glucocorticoid concentration based on a standard curve.

The application relates to the field of adsorbents, and discloses a LiLSX molecular sieve adsorbent and a preparation method thereof. The method comprises the following steps: 1) sequentially performing molding treatment, first drying and first calcination on a mixture of kaolin and NaLSX molecular sieve powder to obtain a first calcination product; 2) performing pre-wetting treatment on the first calcination product to obtain a pre-wetting product; 3) contacting the pre-wetting product with alkali and a silicon source or contacting the pre-wetting product with alkali and an aluminum source in the presence of water to obtain a contact product; 4) performing second drying and second calcination on the contact product to obtain a second calcination product; and 5) performing lithium ion exchange on the second calcination product by using an exchange solution containing lithium ions, and the amount of the NaLSX molecular sieve powder is 85% or more in weight based on the total weight of the mixture. The method can make the prepared LiLSX molecular sieve adsorbent have excellent adsorption performance and mechanical strength.

This invention belongs to the field of wet electronic chemicals technology, specifically relating to a method for preparing electronic-grade hydrogen peroxide. The method includes the following steps: adjusting the concentration of raw hydrogen peroxide, and then filtering it sequentially through a reverse osmosis membrane, a modified cation exchange resin, an anion exchange resin, and a mixed ion exchange resin to obtain electronic-grade hydrogen peroxide. The modified cation exchange resin used is modified based on conventional cation exchange resin through pore expansion and grafting, optimizing the spatial matching of pore structure and functional sites. This achieves passivation of metal ions, enhanced adsorption capacity, and improved oxidation resistance, as well as a deep synergistic effect of these three effects. Ultimately, it achieves the dual goals of efficient purification and stable operation of the resin in the hydrogen peroxide system. The resulting electronic-grade hydrogen peroxide can reduce the content of single impurity metal ions to below 5 ppt, meeting the requirements of SEMI G5 standards, and can be directly applied to high-end manufacturing fields such as semiconductor wafer cleaning.

The application belongs to the technical field of steel drum processing device, and discloses a high-strength steel drum forming processing device, which comprises an equipment rack, a forming assembly unit is arranged in the equipment rack, the forming assembly unit comprises a barrel-shaped mold inner core fixedly connected in the equipment rack, a hydraulic push rod one is fixedly connected to the lower inner wall of the equipment rack, an arc bottom push plate is mounted at the output end of the hydraulic push rod one, and a hydraulic push rod two is fixedly connected to the left and right inner walls of the equipment rack in a symmetrical mode, the electric guide rail drives the edge seam welding arm and the welding head to move stably, the longitudinal edge seam after the steel sheet is formed can be accurately aligned and welded, the waste gas treatment unit and the welding operation are synchronously operated, the pump machine stably generates a negative pressure suction force, the negative pressure suction force is efficiently transmitted to each dust suction head through a flexible hose, the multiple ring-shaped equidistantly distributed dust suction heads can quickly and comprehensively adsorb the waste gas and dust generated in the welding process, and the waste gas and dust are prevented from diffusing to the operation area.

The application belongs to the technical field of optical part processing devices, and particularly relates to an intelligent processing device for precise parts of optical instruments, comprising a base; side plates are installed on the top of the base, grinding assemblies are arranged between the two groups of side plates, hollow sliding cavities are formed in the end portions of the two groups of side plates, two groups of linkage shafts are slidingly connected in the hollow sliding cavities, the two groups of linkage shafts are slidingly connected at the two ends of the grinding assemblies, purification assemblies for adsorbing and cleaning the grinding assemblies are installed on the outer walls of the two groups of side plates, the driving assembly is used for horizontally moving, adsorbing and rotating the lens of the optical instrument that needs to be edged, the lens is ground at the edge in the horizontal moving and rotating process through the grinding assembly, the ground lens is in a state of flat edge, and the lens before and after grinding can be subjected to optimized treatment of the construction environment through the continuous working of the purification assembly, so that the operation efficiency of self-adaptive processing and adjustment of a single lens is improved.

This invention relates to the field of vapor phase etching (VPE) apparatus technology, specifically a double-sided VPE apparatus for semiconductor silicon wafers. The apparatus includes a VPE apparatus body, a silicon wafer transfer mechanism at the upper end of the apparatus body, an etching chamber fixedly mounted on the outer side of the apparatus body, and a mounting base fixedly mounted on the upper end of the etching chamber. By combining the VPE mechanism with a central air-guiding mechanism, stable adsorption of the semiconductor silicon wafer is ensured during the etching process, avoiding vibration and improving etching efficiency and precision. A Bernoulli-style chuck structure is formed by the cooperation of the air-guiding support stage and the central stage, stably "fixing" the silicon wafer above the air-guiding support stage, minimizing contact with the semiconductor silicon wafer, avoiding physical damage and contamination, and simultaneously enabling multi-directional airflow distribution to meet auxiliary heat dissipation needs for the semiconductor silicon wafer, further improving the accuracy and etching efficiency of the VPE process.

The application relates to the technical field of catalysts, and discloses a nano magnesium oxide material and a preparation method and application thereof. The nano magnesium oxide material has a porous structure, wherein the particle size of the nano magnesium oxide is 20-200 nm; and the pore size of the porous structure is 5-45 nm. The classical nucleation growth process of the magnesium oxide is directionally adjusted in a weak alkaline nucleation system, and then the nano magnesium oxide with a controllable grain size distribution is obtained. The nano magnesium oxide material has good catalytic activity in the synthesis of propylene carbonate from CO2 and an epoxide under the conditions of no solvent and no auxiliary agent, and the catalyst is not deactivated after multiple uses, and has good stability.

A method for preparing a capacitive deionization anode for phosphate adsorption and desorption, and its application, belong to the field of inorganic phosphorus wastewater adsorption and enrichment. This invention aims to solve the problems of existing adsorption materials, such as low phosphate adsorption capacity, difficulty in reusing the adsorbent, or poor conductivity. Method: 1. Preparation of a PEDOT / YMOF-NH2 composite material; 2. Preparation of a capacitive deionization anode. Application: It is used for the adsorption and desorption of phosphates in phosphate-containing water. This invention is used for the preparation of a capacitive deionization anode for phosphate adsorption and desorption.

The application relates to the technical field of pet products and environment-friendly materials, in particular to a cat litter deodorization composite additive and a preparation method thereof, deodorization cat litter containing the cat litter deodorization composite additive and a preparation method thereof. The cat litter deodorization composite additive comprises zeolite and protein peptides with a specific molecular weight; the deodorization cat litter prepared by using the cat litter deodorization composite additive can significantly improve the ammonia-nitrogen adsorption capacity, the ammonia-nitrogen removal rate and the deodorization duration of the cat litter.

The present application belongs to the technical field of biochar, and particularly relates to a high-activity acidolysis biochar, which is prepared by the following steps: S1, pretreating agricultural and livestock waste; S2, acidolysing the pretreated biomass with dilute acid to obtain acidolysed biomass; S3, placing the acidolysed biomass into a high-temperature furnace to perform carbonization under an oxygen-free condition, and using a step-by-step heating mode to obtain preliminary biochar; and S4, mixing the preliminary biochar with a copolymer solution to prepare the high-activity acidolysis biochar. In the present application, the sodium lignosulfonate-polyglutamic acid copolymer forms a stable connection with the biochar through chemical bonding, the porous surface of the biochar is uniformly covered with the copolymer to form a nanoscale film, the composite has stronger complexing, chelating and ion exchange capacity for heavy metal ions and other cations in the soil, and is helpful to reduce toxic substances in the soil and improve the soil environment.

This invention relates to the field of heavy metal contaminated water or soil remediation technology, and discloses the application of magnesium-based cementitious materials in heavy metal ion remediation in ultra-stable mineralized environments. This invention can achieve good heavy metal adsorption effects in a short time, without the release of toxic substances or secondary pollution, and is suitable for the remediation of heavy metal contaminated water or soil.

The application discloses a preparation method of polyurea porous material with flower cluster structure and application thereof. The material prepared by the application is a flower cluster porous polyurea material prepared by a self-assembly reaction in a mixed solvent of acetone and water, with hexamethylene diisocyanate as a reaction monomer. Nucleophilic addition reaction occurs between isocyanate groups and water molecules to generate a urethane intermediate, the intermediate rapidly decomposes to release CO2 gas and generate an amine group; the newly generated amine group immediately reacts with the remaining isocyanate groups in the system to form a polyurea oligomer, and then self-assembles into a flower cluster porous structure. The polyurea flower cluster structure has a high specific surface area, rich pores and controllable surface chemical properties, is an ideal material as an adsorbent, and can effectively capture dye molecules in a solution. The application solves the key technical problems of low adsorption capacity and poor selectivity of traditional adsorption materials in dye wastewater treatment.

The present application relates to the technical field of coke oven gas purification, and discloses a microcrystalline material adsorption equipment for coke oven gas purification, which comprises a feeder, a first rectifying tower, a second rectifying tower and a third rectifying tower connected in sequence; a pressurizing machine is used for pressurizing or cooling the coke oven gas during the adsorption process, which is beneficial to the adsorption of adsorbate on the adsorbent; a heater is used for heating the coke oven gas during the adsorption process, which is beneficial to the regeneration of the adsorbent and the process of adsorption separation cycle; the first rectifying tower is used for primary adsorption and fine removal, and active carbon spherical adsorbents are arranged in the first rectifying tower; the second rectifying tower is used for secondary adsorption and fine removal, and iron oxide adsorbents are arranged in the first rectifying tower; the third rectifying tower is used for tertiary adsorption and fine removal, and hydrophobic microcrystalline material adsorbents are arranged in the third rectifying tower. The present application has the advantages of adopting multiple adsorption components to cooperate with graded adsorption, and adopting heating adsorption and pressure swing adsorption to improve the adsorption and regeneration effect on coke oven gas.

The invention relates to the technical field of catalysts, and discloses a catalyst and a preparation method thereof, and a method for preparing 4-methyl-1-pentene through propylene dimerization, the catalyst comprises a carrier, and an active metal component and an auxiliary metal component loaded on the carrier; wherein the carrier comprises potassium carbonate and a binder, the active metal component is selected from sodium and / or potassium, and the auxiliary metal component is selected from at least one of precious metals; wherein on the basis of the mass of the carrier, the content of the active metal component is 1-20wt% and the content of the auxiliary metal component is 0.1-10wt% in terms of metal elements. The catalyst has high catalytic activity and stability in propylene dimerization reaction.