37 results about "Methylcyclohexane" patented technology

The invention discloses a toluene hydrogenation catalyst used at room temperature and normal pressure as well as a preparation method and application thereof, oxidation modified carbon nanofibers are adopted as a carrier, and face-centered cubic Ru is loaded on the oxidation modified carbon nanofibers in the form of nanoparticles through solvothermal reaction to obtain the toluene hydrogenation catalyst. The catalyst provided by the invention can efficiently catalyze toluene hydrogenation to generate methylcyclohexane under the conditions of room temperature and normal hydrogen pressure. Compared with a traditional catalyst, the carbon oxide nanofiber supported ruthenium catalyst not only can work under relatively mild conditions, but also can keep relatively high activity in long-time use, and provides a key support for low cost of an organic liquid hydrogen storage technology.

This invention relates to the field of chemical hydrogen storage, and discloses a carbon-based catalyst, its preparation method and application, and a method for the dehydrogenation of methylcyclohexane. The catalyst comprises nitrogen (N), carbon (C), hydrogen (H), and platinum nanoparticles; the catalyst has the following properties: "Pt x C y N z H a The schematic chemical composition of the catalyst is shown in the figure, where z:a = 1.5~5; z:x = 5~50; z:y < 0.016; in the catalyst, nitrogen atoms are covalently bonded to at least two carbon atoms; nitrogen atoms are covalently bonded to hydrogen atoms; the carbon tetrachloride adsorption value (CTC) of the catalyst is ≥80%; in the XRD spectrum of the catalyst, the A of the Pt(111), (200), (220), (222) crystal plane diffraction peaks of the platinum nanoparticles is ≥85%, and A = (Pt(111) peak area) / (peak area of ​​Pt(111) + peak area of ​​Pt(200) + peak area of ​​Pt(220) + peak area of ​​Pt(222))) × 100%. This catalyst has good catalytic activity and low hydrogenolysis activity, making it particularly suitable for dehydrogenation reactions, such as the dehydrogenation reaction of alkyl-substituted cycloalkanes. It can effectively control the hydrogenolysis reaction during the dehydrogenation process and reduce the generation of by-products. It is especially suitable for the application of methylcyclohexane dehydrogenation reaction. After the dehydrogenation reaction, the conversion rate of methylcyclohexane is high, and the methane content in the product is <0.3wt%.

The application discloses a high-activity Pt / GaCe-Al2O3 catalyst and a preparation method and application thereof. Firstly, an Al2O3 carrier doped with Ga and Ce is synthesized through a hydrothermal synthesis method; then, metal Pt is loaded on the synthesized GaCe-Al2O3 carrier through an impregnation method, so as to obtain the Pt / GaCe-Al2O3 catalyst with high dehydrogenation activity. The catalyst has a nanosheet structure and has strong adsorption performance on methylcyclohexane, and under the condition of 300 DEG C and normal pressure, the catalyst has excellent catalytic dehydrogenation activity and stability in a methylcyclohexane dehydrogenation reaction, and can realize an ultrahigh hydrogen release rate.

The present application provides a BOG helium extraction method and system, and a MOF slurry absorbent and a preparation method thereof. The absorbent comprises 20-40wt% of a metal organic framework material and 60-80wt% of an organic solvent; the metal organic framework material comprises at least one of HKUST-1, CALF-20, ZIF-67 and ZIF-8; and the organic solvent comprises at least one of dimethyl phthalate, 1,3-dimethyl-2-imidazolinone, N-methyl pyrrolidone, sulfolane and methylcyclohexane. The BOG helium extraction method comprises: pretreating BOG raw gas to obtain He and N2 mixed gas; and under specific temperature and pressure conditions, contacting the He and N2 mixed gas with a volume ratio of 15-30:1 with the MOF slurry absorbent to obtain He. The technical scheme of the present application realizes efficient BOG absorption-adsorption separation and helium extraction under mild temperature and pressure conditions.

The utility model belongs to the technical field of coal tar treatment, and relates to a heavy naphtha recovery system in a coal tar hydrogenation process, which comprises a first atmospheric tower, a second atmospheric tower, a first atmospheric pipeline, a second atmospheric pipeline and a connecting pipeline, the normal first pipeline is communicated with the first atmospheric tower; the atmospheric second pipeline is communicated with the second atmospheric tower; one end of the connecting pipeline is communicated with a first normal pipeline, the other end of the connecting pipeline is communicated with a second normal pipeline, and a communicating valve is arranged on the connecting pipeline; according to the heavy naphtha recovery system in the coal tar hydrogenation process, the connecting pipeline is arranged, so that light naphtha flows into the connecting pipeline along the normal first-line pipeline and then flows into the normal second-line pipeline through the connecting pipeline to be extracted, and heavy naphtha is extracted along the outlet end of the normal first-line pipeline; therefore, meaningless deep processing of heavy naphtha without methyl cyclohexane is avoided, and energy consumption of a heavy naphtha recovery system in a coal tar hydrogenation process is reduced.

A process of hydrogenating a hydrocarbon stream is disclosed. The process comprises passing a dehydrogenated feed stream to a hydrogenation reactor. A hydrogen stream is passed to the hydrogenation reactor. In the hydrogenation reactor, the dehydrogenated feed stream is hydrogenated in the presence of hydrogen and a hydrogenation catalyst to produce a hydrogenated effluent stream comprising methylcyclohexane. The hydrogenated effluent stream is cooled by indirect heat exchange with an organic heat exchange fluid stream to provide a vaporized organic heat exchange fluid stream. The vaporized organic heat exchange fluid stream is expanded to provide electrical power. A product stream is separated from a cooled hydrogenated effluent stream.

A process of hydrogenating an unsaturated hydrocarbon is disclosed. The process comprises passing a hydrocarbon feed stream comprising toluene to a hydrogenation reactor. A hydrogen stream is passed to the hydrogenation reactor. In the hydrogenation reactor, the hydrocarbon feed stream is hydrogenated in the presence of hydrogen and a hydrogenation catalyst to produce a hydrogenated effluent stream comprising methylcyclohexane. The hydrogenated effluent stream is indirectly contacted with a water stream to produce a steam stream. The steam stream is taken from the hydrogenation reactor. In an electrolyzer, hydrogen is separated from the steam stream to produce the hydrogen stream which is passed to the hydrogenation reactor.

The invention provides an efficient catalyst system for methyl cyclohexane dehydrogenation reaction and a preparation method of the efficient catalyst system, and the preparation method comprises the following steps: pretreating a carrier through anions, and loading platinum group metal by adopting a deposition-precipitation method to prepare a dehydrogenation catalyst with a stable structure and high activity. According to the invention, the comprehensive improvement of the dehydrogenation catalyst in the aspects of activity, stability and carbon deposition resistance is realized. The prepared catalyst can keep high activity for a long time in MCH dehydrogenation reaction, the problem that high metal utilization rate, high activity and high stability cannot be achieved at the same time can be effectively solved, the service life of the catalyst is remarkably prolonged, the operation cost and energy consumption caused by frequent regeneration or replacement are reduced, and after a stability test at the temperature of 300 DEG C for 45 h, the stability of the catalyst is greatly improved. And the activity is still kept above 40%.

The present invention relates to the use of a compound of formula (1) or of its mixtures with a compound of formula (II)where R and the dotted line are as defined in the claims and the description, as aroma ingredient, to the use thereof to impart an aroma to a composition, and to a method of imparting an aroma to a composition. The present invention further relates to a composition comprising the compound of formula (I) or a mixture thereof with compound (II), to mixtures of the compound of formula (I) with the compound (II), and to specific compounds of formula (I).

The present invention relates to a method for dehydrogenating a feedstock comprising methylcyclohexane in order to produce a dehydrogenation effluent comprising hydrogen and toluene, by bringing said feedstock into contact with a dehydrogenation catalyst implemented in a reaction section comprising at least one adiabatic reactor, the catalyst comprising an active phase comprising at least platinum and potassium in an amount of between 0.03% and 1% by weight of elemental potassium relative to the total weight of the catalyst, and a support comprising alumina.

The present application relates to natural gas safe storage and transportation technical field, specifically relates to a kind of hydrate promoting composition and its application and gas storage and transportation method.The composition contains neutralizing agent and hydrate formation promoter;Wherein, the neutralizing agent contains component A;The component A is selected from one or more than two of methylcyclohexane, methyl tert-butyl ether, oxidized cyclopentene and tetrahydrofuran-3-ketone.The hydrate promoting composition can still improve the generation rate of hydrate, gas storage capacity and recovery rate in hydrate decomposition recovery stage under the adverse conditions that alcohol and / or salt exist in water source.

This invention provides an electrically internally heated Pt / CeO2 / Foam monolithic catalyst, its preparation method, and a method for dehydrogenating methylcyclohexane. The catalyst preparation method includes: mixing a CeO2 dispersion with a Pt precursor solution, followed by static aging, drying, and calcination to obtain a Pt-CeO2 composite; mixing the Pt-CeO2 composite with a solvent to obtain a slurry, coating it onto a metal foam, and then vacuum drying and reduction pretreatment to obtain the electrically internally heated Pt / CeO2 / Foam monolithic catalyst. The electrically internally heated Pt / CeO2 / Foam monolithic catalyst provided by this invention has a highly dispersed active component Pt, and the CeO2 surface has abundant and tunable oxygen defect structures. Pt and CeO2 exhibit strong interactions, and the geometric and electronic structures of Pt are tunable. Furthermore, as a monolithic catalyst, it possesses excellent electrical and thermal conductivity, as well as good mass and heat transfer performance.

The application provides a gas-liquid separation and purification system and method based on a liquid organic dehydrogenation process, which separates methylcyclohexane dehydrogenation products into gaseous dehydrogenation products and liquid dehydrogenation products through a first gas-liquid separator; an absorption tower receives the gaseous dehydrogenation products and removes organic components in the gaseous dehydrogenation products by means of an absorbent to obtain crude hydrogen; a molecular sieve filter receives the crude hydrogen, and high-purity hydrogen is obtained after filtration and purification; a solvent regenerator performs resolution and regeneration treatment on the liquid phase mixed components discharged from the absorption tower, so that the absorbent in the liquid phase mixed components is enriched at the bottom of the tower, the organic components are enriched at the top of the tower, the absorbent enriched at the bottom of the tower is returned to the absorption tower, and the regeneration and reuse of the absorbent are completed. The combination of the absorption tower and the regenerator can solve the separation problem of hydrogen and aromatic organic matter, reduce the load of the purification section, effectively prolong the service life of the material in the absorption section, and realize deep purification of hydrogen and efficient recovery of organic matter.

The invention relates to a water-in-oil emulsion-based method for enhancing hydration curing hydrogen storage and a method for calculating the hydrogen storage capacity of the water-in-oil emulsion-based method for enhancing hydration curing hydrogen storage, and the water-in-oil emulsion-based method for enhancing hydration curing hydrogen storage comprises the following steps: adding a water-in-oil emulsion into a hydrate reaction container; an oil phase in the water-in-oil emulsion is at least one of cyclopentane, cyclohexane, methyl cyclohexane, methyl cyclopentane and hydrocarbon mineral oil; according to the phase equilibrium diagram of the hydrogen-thermodynamic promoter binary hydrate, obtaining a target temperature and a target pressure for generating the hydrogen hydrate; hydrogen is injected to target pressure, then the temperature is reduced to target temperature, heat preservation is conducted, and meanwhile stirring is conducted to generate hydrogen hydrate; or reducing the temperature to the target temperature and preserving heat, injecting hydrogen to the target pressure, and stirring to generate the hydrogen hydrate. By using the water-in-oil emulsion, a gas-liquid contact interface can be obviously increased, hydrogen storage conditions are reduced, hydrogen mass transfer and hydrate conversion rate can be efficiently enhanced, environmental friendliness and economical efficiency are achieved, and hydrogen storage efficiency can be obviously improved.

The present invention relates to a process for dehydrogenating a feed comprising methylcyclohexane to produce a dehydrogenation effluent comprising hydrogen and toluene, by contacting said feed with a dehydrogenation catalyst implemented in a reaction section comprising at least one adiabatic reactor, said catalyst comprising an active phase comprising at least platinum and potassium at a content of between 0.03% and 1% by weight of element potassium relative to the total weight of the catalyst, and a support comprising alumina.

To address the problem of high negative electrode compaction density and poor cycle life in lithium-ion batteries, this invention provides a non-aqueous electrolyte and a lithium-ion battery. The non-aqueous electrolyte comprises a lithium salt, an organic solvent, and additives. The additives include 1,3-di(isocyanate methyl)cyclohexane and propylene sulfate. The mass percentage of 1,3-di(isocyanate methyl)cyclohexane in the non-aqueous electrolyte is A, and the mass percentage of propylene sulfate is B. A and B satisfy the following relationship: 0.5 ≤ A + B ≤ 3, and 0.1 ≤ A × B ≤ 1. This invention effectively improves the cycle performance and heat resistance of lithium-ion batteries through the compounding of 1,3-di(isocyanate methyl)cyclohexane and propylene sulfate and the optimization of their ratio.

The invention discloses a preparation method of a methylcyclohexane-toluene liquid organic hydrogen storage catalyst. The preparation method specifically comprises the following steps: step 1, preparing lamellar V2CTx; and 2, preparing the methylcyclohexane-toluene liquid organic hydrogen storage catalyst according to the product obtained in the step 1. The invention also discloses a methylcyclohexane-toluene liquid organic hydrogen storage catalyst. By adopting the catalyst prepared by the invention, side reaction can be inhibited while the dehydrogenation efficiency is improved.

The present invention relates to a polycarbonate composition comprising the following components, relative to the total weight of the composition: A) 0-76 wt. % of copolycarbonate resin containing bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane units and substituted or unsubstituted bisphenol units, B) 0-58 wt. % of an aromatic linear polycarbonate resin, C) 15-52 wt. % of poly(1,4-cyclohexylenedimethylene 1,4-cyclohexanedicarboxylate), and D) 1-60 wt. % of methyl methacrylate-n-butyl acrylate-butadiene-styrene copolymer, The composition according to the present invention has a high light transmittance, a low haze, and a low birefringence.

The invention discloses a preparation method of a catalyst carrier and a catalyst for methyl cyclohexane dehydrogenation, and belongs to the technical field of hydrogen energy storage, transportation and catalysis. The preparation of the catalyst carrier comprises the following steps: by taking carbonization pseudo-boehmite as a base material, adding a pore-enlarging agent, a binder and cerium / lanthanum salt, and carrying out high-speed mixing, banburying, extrusion molding, drying and roasting, thereby obtaining the catalyst carrier. And preparation of the catalyst: preparing a platinum salt solution according to the water absorption of the carrier, adding a precipitator after adsorption, reacting at 40-70 DEG C for 1-4 hours, cleaning until the conductivity is less than 50 [mu] S / cm, and roasting to obtain the catalyst with the Pt loading capacity of 0.48-1%. The carrier can be independently used, the catalyst is cooperated with a Pt process through the carrier, the problems of insufficient low-temperature activity, poor stability and high cost of the existing scheme are solved, the process is simple and easy to industrialize, and the catalyst has extremely high practical value.

The application belongs to the technical field of organic electroluminescence, and relates to an organic compound, an organic electroluminescent device using the same and an electronic device. The organic compound is composed of a fused aromatic ring of tetramethylcyclohexane and an indolocarbazole connection. The organic compound is used in an organic electroluminescent device, and the performance of the organic electroluminescent device can be significantly improved.

The invention belongs to the technical field of liquid organic hydrogen storage, and particularly relates to a supported multi-metal atomic-scale dispersion catalyst for hydrogenation of a liquid organic hydrogen storage carrier and a preparation method of the supported multi-metal atomic-scale dispersion catalyst. According to the supported multi-metal atomic-scale dispersion catalyst for hydrogenation of the liquid organic hydrogen storage carrier, platinum and auxiliary metal are dispersed on the surface of the carrier in an atomic-scale manner, a synergistic effect is shown in a toluene hydrogenation reaction, the catalytic toluene hydrogenation reaction activity and the methylcyclohexane selectivity are obviously improved, meanwhile, the cyclic stability is good, and the catalyst can be applied to hydrogenation of the liquid organic hydrogen storage carrier. The catalyst is a high-performance catalyst; meanwhile, by adjusting the dosage of the auxiliary metal, the temperature during calcination heat treatment and the dosage of the carrier, the catalytic toluene hydrogenation reaction activity and the methylcyclohexane selectivity can be further optimized, and therefore the technical problem that in the prior art, a liquid organic hydrogen storage carrier hydrogenation reaction catalyst is low in performance is solved.

The application discloses a preparation method of a methylcyclohexane dehydrogenation catalyst Pt-based manganese-titania, and specifically comprises the following steps: step 1, preparing Mn-TiO2 powder; and step 2, preparing a Pt / Mn-TiO2 catalyst according to the product obtained in step 1. In the application, Mn is doped in the crystal lattice of TiO2 to form Mn-TiO2, and then Pt catalytic active centers are further introduced to improve catalytic activity, so that the hydrogenation / dehydrogenation dual-effect function can be realized, and the hydrogen purification rate is improved.

This application discloses a method for predicting the catalytic dehydrogenation performance of organic hydrogen storage liquids based on a large language model. This application proposes an intelligent prediction and recommendation framework that integrates a large language model and domain knowledge retrieval. The RAG module matches input conditions and catalyst information with highly relevant content in the knowledge base, and combines this with multimodal feature analysis and latent pattern reasoning using a large language model to generate predicted catalytic performance values ​​for the target LOHC system, as well as recommended catalyst composition and reaction conditions. This application is adaptable to various LOHC systems, including methylcyclohexane, demethylnaphthalene, and diphenylmethane, achieving cross-system, high-precision performance prediction and optimization.

The invention discloses a self-activation catalyst for catalyzing ethylene tetramerization to prepare 1-octylene, a preparation method and an application method. The self-activation catalyst comprises an aryl ether-silicon bridged diphosphine ligand chromium complex [L1L2Cr] < + > and tetraphenyl boron anions paired with the aryl ether-silicon bridged diphosphine ligand chromium complex [L1L2Cr] < + >; the aryl ether-silicon bridged diphosphine ligand chromium complex [L1L2Cr] < + > has a structure as shown in a formula (1). When the self-activation catalyst is used, 1-octene can be obtained through self-activation catalysis of ethylene tetramerization in inert solvents such as methylcyclohexane without cocatalysts such as methylaluminoxane or aluminum alkyl, catalyst preparation steps are simplified, and reaction cost is reduced.

The application discloses a preparation method of a dihydroxyethyl bisphenol A ether and belongs to the technical field of organic synthesis. The steps of the preparation method are as follows: bisphenol A, a mixed acetate catalyst and a solvent are added into a reaction kettle, nitrogen is replaced after stirring is started, the temperature is increased to a reaction temperature, then the reaction is started by introducing ethylene oxide, the temperature is kept after the ethylene oxide is added completely, the reaction is continued until the pressure does not decrease, the temperature is decreased to a desolventizing temperature, then desolventizing is carried out until no solvent comes out, and then the temperature is decreased, the gas is removed, and the product is discharged, so that the dihydroxyethyl bisphenol A ether is obtained; wherein the mixed acetate catalyst is composed of calcium acetate, magnesium acetate and barium acetate; and the solvent is methylcyclohexane. The preparation method has excellent catalytic effect, the prepared dihydroxyethyl bisphenol A ether has high content, low hydroxyl value and light color, and the solvent has small toxicity and is easy to recycle.

This application discloses a photocatalytic dehydrogenation device and method for methylcyclohexane, comprising a gasifier, a heating reaction device, a chromatograph, and a product collector connected in sequence. The gasifier has a hydrogen inlet and a methylcyclohexane inlet. A xenon lamp light source is installed at a corresponding position in the heating reaction device. This device can dehydrogenate methylcyclohexane without external heating, achieving a hydrogen release process under mild conditions. The photocatalytic methylcyclohexane dehydrogenation has a fast start-up speed, on the order of seconds, significantly faster than the tens of minutes required for traditional thermal catalysis. Furthermore, the photocatalytic device of this application uses a fixed-bed reactor, enabling continuous feeding of methylcyclohexane and thus continuous hydrogen release. In addition, the device is equipped with a heating furnace, which provides additional heat for the photocatalytic reaction, further increasing the methylcyclohexane dehydrogenation rate and accelerating the hydrogen release speed.

This invention relates to the field of precious metal nanocatalytic materials, specifically to carbon-coated alumina-supported Pt / CeO2 catalytic materials, their preparation methods, and applications. The catalyst of this invention uses carbon-coated alumina (CCA) as a support, with platinum / cerium oxide (Pt / CeO2) active components dispersed in islands on the support surface. The cerium oxide nanoparticles strongly anchor platinum species through oxygen vacancies, forming a stable Pt-CeO2 interface, thereby effectively inhibiting high-temperature platinum sintering. Furthermore, the thin carbon layer on the support surface neutralizes the acidic sites of the alumina, reducing the formation of carbon precursors at the source, achieving a balance between "anti-sintering" and "anti-carbon deposition." The catalyst of this invention exhibits high dispersibility and stability under low platinum loading, with significantly improved platinum utilization. It achieves a conversion rate >95% and a selectivity of nearly 100% in the dehydrogenation of methylcyclohexane, cyclohexane, and propane. Its stability and resistance to deactivation after more than 50 hours far exceed those of traditional catalysts, demonstrating broad application prospects and significant industrial promotion value in hydrogen energy storage and transportation and green chemical engineering.

A process of hydrogenating a hydrocarbon stream is disclosed. The process comprises passing a dehydrogenated feed stream to a hydrogenation reactor. A hydrogen stream is passed to the hydrogenation reactor. In the hydrogenation reactor, the dehydrogenated feed stream is hydrogenated in the presence of hydrogen and a hydrogenation catalyst to produce a hydrogenated effluent stream comprising methylcyclohexane. The hydrogenated effluent stream is cooled by indirect heat exchange with an organic heat exchange fluid stream to provide a vaporized organic heat exchange fluid stream. The vaporized organic heat exchange fluid stream is expanded to provide electrical power. A product stream is separated from a cooled hydrogenated effluent stream.

The invention belongs to the technical field of liquid organic hydrogen storage carrier catalytic dehydrogenation, and particularly relates to a nano-diamond / graphene composite material loaded platinum-based bimetallic catalyst, preparation and application thereof in methyl cyclohexane dehydrogenation reaction. According to the catalyst, a nano-diamond / graphene composite material with a high specific surface area is used as a carrier, platinum is anchored on the surface of the carrier in an atomic-scale dispersed cluster form, and auxiliary metal is anchored on the surface of the carrier in an atomic-scale dispersed cluster or monatomic form. The loading capacity of platinum in the catalyst is 0.01-0.5 wt.%, and the loading capacity of the auxiliary agent metal is 0.1-1 wt.%. Compared with a traditional catalyst, the catalyst provided by the invention can realize efficient and stable dehydrogenation of methylcyclohexane under a mild low-temperature condition (200-300 DEG C) to obtain toluene and hydrogen. The catalyst disclosed by the invention is low in production cost, simple in preparation method, high in catalytic activity and stable in performance, and a technical basis is provided for low-temperature efficient hydrogen production of a liquid organic hydrogen storage medium.