65 results about "Methylcyclohexane" patented technology

The invention discloses a preparation method of a catalyst for dehydrogenation of methylcyclohexane. The preparation method specifically comprises the following steps: step 1, preparing a catalyst carrier 2D-CrB; and 2, preparing the catalyst Pt / 2D-CrB according to the product obtained in the step 1. The invention also discloses a catalyst for dehydrogenation of methylcyclohexane. The problem that the efficiency is low when the existing catalyst is used for catalyzing the dehydrogenation reaction of methylcyclohexane is solved.

A preparation method of a platinum-boron aluminum catalyst for dehydrogenation of methylcyclohexane comprises the following steps: step 1, taking aluminum nitrate nonahydrate, adding CTAB (cetyltrimethyl ammonium bromide), and pouring absolute ethyl alcohol into a beaker A; adding boric acid and deionized water into a beaker B, and pouring the solution in the beaker B into the beaker A; slowly dropwise adding ammonia water into the beaker A, then adding absolute ethyl alcohol, and aging; evaporating the solution in the beaker A, drying in a drying oven, and finally putting in a muffle furnace; preparing a B-O-Al carrier with a large specific surface area; step 2, putting the B-O-Al carrier with the large specific surface area and absolute ethyl alcohol into a beaker, then adding a chloroplatinic acid solution, then putting the beaker into ultrasonic waves for oscillation, and then putting the beaker into a drying oven for drying to obtain a Pt / B-O-Al (unreduced) catalyst; and putting the Pt / B-O-Al (unreduced) catalyst into a tubular furnace, and reducing the Pt / B-O-Al (unreduced) catalyst under the condition of H2 to finally obtain the Pt / B-O-Al catalyst. The catalyst has the characteristics that the low-temperature requirement is low, the sintering inactivation resistance is high, and high-efficiency, long-life and stable dehydrogenation can be realized under the low Pt loading capacity (1wt%).

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.

The utility model belongs to the resource recovery technical field relates to a methylcyclohexane separation and recovery device, including heavy separation tower, heavy separation tower top reflux pump, de -heavy tower, de -heavy tower reflux pump, product tank and naphtha pipeline, the tower top of heavy separation tower communicates with one end of heavy separation tower top reflux pump, the other end of heavy separation tower top reflux pump communicates with the tower side of heavy separation tower and the tower side of de -heavy tower respectively, the tower top of de -heavy tower communicates with the tower side of de -heavy tower and product tank respectively after de -heavy tower reflux pump. The utility model further realizes the efficient separation and recovery of methylcyclohexane by de -heavy tower, thereby reducing the content of methylcyclohexane in heavy separation tower kettle liquid, improving methylcyclohexane yield and raw material utilization, and avoiding direct economic loss, increasing the income.

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 application discloses a method for extracting high-purity hydrogen from hydrogen-natural gas mixed components, and specifically comprises the following steps: step 1, preparing a platinum-based MXene / MAX hybrid monomer catalyst; step 2, carrying out a hydrogenation reaction of hydrogen-mixed natural gas and toluene under the action of the catalyst obtained in step 1 to obtain methylcyclohexane and realize hydrogen storage; and step 3, carrying out a dehydrogenation reaction on the methylcyclohexane obtained in step 2 under the catalysis of the catalyst obtained in step 1 to obtain toluene and hydrogen. The bieffect platinum-based MXene / MAX hybrid monomer catalyst prepared by the application can realize hydrogenation / dehydrogenation bieffect functions and improve the hydrogen purification rate.

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 invention discloses a synthesis method of ETFE, and belongs to the technical field of organic synthesis. The method comprises the following steps: carrying out a dehydration reaction on THFA and alkali metal hydroxide in methylcyclohexane, separating out water generated in the dehydration reaction, and adding halogenated ethane to carry out a condensation reaction, so as to obtain a salt-containing ETFE crude product; and filtering the salt-containing ETFE crude product to remove halide salt, and sequentially separating and recovering methylcyclohexane and ETFE distillate through atmospheric distillation. According to the method, the synthesis process of alkoxide is simplified, side reactions are few, subsequent condensation and distillation separation are facilitated, the yield of the obtained ETFE is higher than 98.0%, and the mass content is gt; the anionic polymerization structure regulator has the advantages of low cost, environmental protection, safety and reliability, and can meet the application requirements of the anionic polymerization structure regulator.

The invention provides a gas-liquid separation and purification system and method based on a liquid organic dehydrogenation process. A methylcyclohexane dehydrogenation product is separated into a gas-phase dehydrogenation product and a liquid-phase dehydrogenation product through a first gas-liquid separator; the absorption tower receives the gas-phase dehydrogenation product and absorbs and removes organic matter components in the gas-phase dehydrogenation product with the help of an absorbent, and crude hydrogen is obtained; the molecular sieve filter receives the crude hydrogen and filters and purifies the crude hydrogen to obtain high-purity hydrogen; the solvent regeneration tower is used for analyzing and regenerating 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 matter components are enriched at the top of the tower, and the absorbent enriched at the bottom of the tower is returned to the absorption tower to complete regeneration and reuse of the absorbent. Through the combination of the absorption tower and the regeneration solvent tower, the problem of separation of hydrogen and aromatic organic matters can be solved, the load of a pure working section is reduced, the material service life of an absorption working section is effectively prolonged, and deep purification of hydrogen and efficient recovery of organic matters are realized.

This invention relates to a room-temperature reactive silicone-containing matte semi-permanent release agent and its preparation method. The purpose of this invention is to solve the problems of existing release agents requiring one application per mold and high-temperature curing. The room-temperature reactive silicone-containing matte semi-permanent release agent is prepared by mass fraction of 30%–80% solvent, 10%–30% film-forming aid, 10%–20% spreading agent, 1%–10% film-forming agent, and 0.1%–2% catalyst. The film-forming aid is n-nonane and 2,6-dimethyloctane; the spreading agent is 1-ethyl-4-methylcyclohexane and 1,2,4-trimethylcyclohexane; and the film-forming agent is methoxy-terminated silicone resin and hydroxyl-terminated polymethylphenylsiloxane. The release agent prepared by this invention adheres firmly to the mold surface based on chemical bonding, exhibiting a low transfer rate during repeated demolding of the product, thus achieving "one-time coating, multiple demoldings".

The application discloses a pure-silicon Beta molecular sieve encapsulated metal catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: dissolving a silicon source, a template agent, a ligand, a metal salt and a mineralizer in water to perform a crystallization reaction at 120-200 DEG C, and then performing calcination treatment and reduction treatment on the solid after crystallization to obtain the pure-silicon Beta molecular sieve encapsulated metal catalyst. The pure-silicon twelve-membered ring large-pore Beta molecular sieve encapsulated metal catalyst is prepared through a ligand protection in-situ hydrothermal synthesis strategy, which can not only reduce the size of metal nanoclusters and improve the high-temperature thermal stability of the metal nanoclusters, but also can control the adsorption and diffusion process of guest molecules, and thus exhibits excellent catalytic performance in catalyzing propane dehydrogenation reaction and methylcyclohexane dehydrogenation reaction, and realizes efficient and stable propane and methylcyclohexane dehydrogenation performance.

The present invention discloses a method for separating toluene and methylcyclohexane, which utilizes hetero[3]aromatic hydrocarbon crystal materials to absorb and separate a mixture of toluene and methylcyclohexane. The chemical structure of the hetero[3]aromatic hydrocarbon crystal materials is as follows: The separation process of the present invention is simple to operate and has low equipment requirements; the separation process does not require distillation operation, has low energy consumption, saves energy, and reduces the production cost of toluene; the crystal materials used are highly stable and can be recycled without reducing the separation effect.

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 application discloses a renewable high-activity Pt / CeO2-Al2O3@SiO2 catalyst and a preparation method and application thereof, and relates to the technical field of catalysts. The method comprises the following steps: firstly, preparing a CeO2-Al2O3 composite carrier through a hydrothermal synthesis method; then, loading metal Pt onto the carrier by using an impregnation method; finally, taking tetraethyl orthosilicate as a silicon source, depositing silicon onto the surface of the Pt / Al2O3 catalyst to form the Pt / CeO2-Al2O3@SiO2 catalyst, the loading amount of Pt in the catalyst is 1.5 wt.%, the molar ratio of Ce / Al is 1 / 10, and the added amount of Si is 0.5-1.5 wt.%. The catalyst is effectively prevented from sintering and leaching of the metal Pt in the multiple regeneration processes through the strong interaction between the carrier and the metal and the synergistic physical coating effect of the surface SiO2; the catalyst maintains stable activity after 10 regeneration cycles in the methylcyclohexane dehydrogenation reaction.

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.