103 results about "Methylcyclohexane" patented technology

The invention discloses a pure silicon Beta molecular sieve packaging 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, carrying out a crystallization reaction at 120-200 DEG C, and carrying out calcination treatment and reduction treatment on the crystallized solid to obtain the pure silicon Beta molecular sieve packaging metal catalyst. The pure silicon Beta molecular sieve packaged metal catalyst is obtained. The pure silicon twelve-membered ring macroporous Beta molecular sieve encapsulated metal catalyst is prepared through a ligand protection in-situ hydrothermal synthesis strategy, so that the size of a metal nanocluster can be reduced, the high-temperature thermal stability of the metal nanocluster is improved, the adsorption and diffusion processes of guest molecules can be regulated and controlled, and the stability of the metal nanocluster is improved. Furthermore, the catalyst shows excellent catalytic performance when being used for catalyzing a propane dehydrogenation reaction and a methyl cyclohexane dehydrogenation reaction, and efficient and stable propane and methyl cyclohexane dehydrogenation performance is achieved.

The invention belongs to the technical field of toluene hydrogenation catalysts, and particularly relates to a magnetically separable carbon-supported ruthenium cluster catalyst as well as a preparation method and application thereof. According to the catalyst, a nickel-coated graphene core-shell structure carbon material is used as a carrier, and ruthenium is loaded on a graphene shell layer in a cluster form through a deposition and precipitation method. The catalyst can efficiently catalyze toluene hydrogenation to generate methylcyclohexane under the mild condition of 80-110 DEG C and the hydrogen pressure of 10-30 bar. Compared with a traditional catalyst, the magnetic separable catalyst not only can work under a relatively mild condition, but also can be separated, recycled and reused by externally applying a magnetic field, so that the targets of environmental protection, energy conservation and emission reduction are further achieved.

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.

The preparation method comprises the following steps: combining a solvent confinement hydrolysis-polymerization volatilization method with a roasting crystal transformation in-situ metal doping technology to prepare a mesoporous Ni-Al composite oxide carrier with an excellent structure, texture and surface properties, and carrying out in-situ metal doping on the mesoporous Ni-Al composite oxide carrier to prepare the Pt-loaded Ni-Al composite oxide catalyst for dehydrogenation of methylcyclohexane, so as to obtain the Pt-loaded Ni-Al composite oxide catalyst for dehydrogenation of methylcyclohexane. The preparation method comprises the following steps: loading a low-loading-capacity Pt active component by virtue of an impregnation method, realizing highly uniform dispersion and stable immobilization of Pt active sites on the surface of a carrier in a single atomic cluster form by virtue of a strong bonding effect between coordinated unsaturated aluminum species on the surface of the carrier and a Pt precursor, improving an electronic structure of the metal Pt active sites, and preparing the catalyst. The catalytic activity of the catalyst on a low-temperature dehydrogenation reaction of methylcyclohexane is improved. The Pt dispersity of the Ni-Al composite oxide loaded Pt catalyst reaches 60.0% or above, and the Ni-Al composite oxide loaded Pt catalyst shows extremely high catalytic activity, selectivity, stability and reproducible and reusable performance in a low-temperature dehydrogenation reaction of methylcyclohexane.

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 bletilla striata polysaccharide gel patch for wound repair and a preparation method of the bletilla striata polysaccharide gel patch, and relates to the field of high polymer materials. When the bletilla striata polysaccharide gel patch for wound repair is prepared, graphene oxide sequentially reacts with 3-methylaminopropylamine and 4-(N-maleimidomethyl) cyclohexane-1-carboxylic acid succinimide ester, and modified graphene oxide is prepared; the preparation method comprises the following steps: extracting bletilla striata polysaccharide from bletilla striata, and reacting the bletilla striata polysaccharide with maleic anhydride and N-methyldopamine in sequence to prepare modified bletilla striata polysaccharide; and reacting the modified bletilla striata polysaccharide, the modified graphene oxide and 1, 5-dibromopentane, mixing with deionized water, coating, and preparing a film, so as to obtain the bletilla striata polysaccharide gel patch for wound repair. The bletilla striata polysaccharide gel patch for wound repair, prepared by the invention, has antibacterial, high-adhesion and antioxidant capacities.

The invention discloses an extractive distillation dehydration separation method of an isopropanol and water azeotropic system, and relates to the field of distillation dehydration. According to the method, an azeotropic entrainer methyl cyclohexane is added into a rectifying tower, the azeotropic entrainer methyl cyclohexane can be mixed with raw materials and can also be added at a position higher than a feeding position in the tower, and the azeotropic entrainer methyl cyclohexane and water form a new low-boiling-point azeotrope. According to the characteristics that an azeotrope formed by methylcyclohexane and water is an unstable azeotrope and the intersolubility of methylcyclohexane and water is low at normal temperature, a tower top reflux tank can be set as an oil-water separator to separate oil-phase methylcyclohexane and water in a water phase, the oil-phase methylcyclohexane is used as an azeotropic entrainer to flow back into the tower, the water is discharged as waste liquid, and the azeotrope is recycled. Therefore, the isopropanol is separated from the water to obtain the high-purity isopropanol. The method has the advantages of simple process, low energy consumption, high product purity, environment-friendly azeotropic entrainer and the like, and is suitable for large-scale industrial production.

A supported carbon molecular sieve membrane having aluminum atomically distributed in it, wherein: the aluminum is present in an amount of equal to or lower than 15 wt. % of the carbon molecular sieve membrane; the membrane comprises a pore size distribution in which at least 70% of the pores have a pore size from 0.25 to 0.7 nm; and which is obtainable by dip-coating a support with a solution comprising a phenolic-resin and aluminum ions, followed by carbonization. The carbon content of the carbon molecular sieve membrane is from 75 wt. % to 95 wt. %, the oxygen content is from 2.5 wt. % to 8 wt. %, and the hydrogen content is from 1.5 wt. % to 6% wt. %. These CMSMs are useful for gas separation, H2 recovery from natural gas grids, H2 production from biomass, solvent dehydration, obtaining oxygen-enriched air, or dehydrogenation of methylcyclohexane, and as a catalytic membrane reactor or part of a catalytic membrane reactor.

The invention relates to a dehydrogenation catalyst, a preparation method and application thereof and a methyl cyclohexane dehydrogenation method. The catalyst comprises a Pt element, a hydrocarbon compound and a carrier, the graphitization degree ID / IG of the hydrocarbon compound is 1.9-1.2, ID is the intensity of a disordered carbon peak, and IG is the intensity of an ordered carbon peak. An organic compound is introduced in the reduction stage of catalyst preparation, and the dehydrogenation catalyst containing the hydrocarbon compound is obtained. An organic compound is converted into a hydrocarbon compound in situ in the reduction process of the catalyst, high-activity sites in the catalyst are reasonably covered, the C-C bond activation capacity of the active sites is weakened or eliminated, the C-H bond activation capacity of the active sites is reserved, and the dehydrogenation selectivity of the catalyst is improved on the premise that the dehydrogenation activity of the catalyst is not weakened.

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 invention relates to the technical field of lithium ion batteries, in particular to a preparation method of water-resistant carbon coating slurry for a lithium battery. According to the invention, methyl cyclohexane diisocyanate, hydroxyethyl methylacrylate, n-dodecanethiol, a surfactant fatty alcohol-polyoxyethylene ether, octadecyl acrylate and a cross-linking monomer N-hydroxymethyl acrylamide are used to prepare an acrylic resin emulsion as a carbon-coated slurry base material, and compared with a common polyacrylic acid binder, the acrylic resin emulsion has the advantages that the viscosity is high; the prepared acrylic resin emulsion has more excellent water resistance, and the problems of stripping, electrolyte leakage and the like caused by the fact that an electrode material easily absorbs water or is decomposed in a high-humidity or liquid contact environment can be solved.

The invention discloses an organic liquid component of a hydrogen carrier and a preparation method of the organic liquid component. The organic liquid component comprises 72-88% by mass of a high-melting-point hydrogen storage component and 28-12% by mass of a low-melting-point solvent component, the high-melting-point hydrogen storage component is naphthalene or indole or a mixture of the naphthalene and the indole; and the low-melting-point solvent component is at least one of trans-decahydronaphthalene, methyl cyclohexane and perhydrogenated indole. The hydrogen storage organic liquid carrier has the advantage that the melting point of the hydrogen storage carrier can be reduced to-32 DEG C or below. The melting point is lower, and the material can be stored and transported at lower temperature, so that the energy consumption and the cost are reduced. Low-temperature storage: because the melting point of the low-melting-point organic liquid is relatively low, the low-melting-point organic liquid can be stored and transported at relatively low temperature, so that the energy consumption and the cost are reduced. The organic liquid has high hydrogen storage capacity, more hydrogen can be stored under the same volume, and the hydrogen storage efficiency is improved. And the organic liquid has good cycle life and can be recycled for multiple times, so that the waste and the cost are reduced.

The invention belongs to the technical field of hydrogen bond organic framework materials, and provides a synthesis method of a thieno [3, 2-b] thiophene-based fluorescent hydrogen bond organic framework material, which comprises the following steps: S1, ligand synthesis; the preparation method comprises the following steps: S1-1, synthesizing 2, 3, 5, 6-tetrabromo thieno [3, 2-b] thiophene; s1-2, synthesizing a compound 4, 4 ', 4' ', 4 '''-(2, 3, 5, 6-tetraphenyl thieno [3, 2-b] thiophene) tetracyano group by adopting a Suzuki-Mipu coupling reaction; and S2, carrying out single crystal synthesis to obtain the HOF-TT-1. The invention further discloses application of the fluorescent hydrogen bond organic framework material based on thieno [3, 2-b] thiophene in separation of methylbenzene and methylcyclohexane, HOF-TT-1 can efficiently adsorb and separate a mixed solution of methylbenzene and methylcyclohexane after being activated, the methylbenzene adsorption efficiency is 89.7%, reversible fluorescence change is accompanied, and the fluorescent hydrogen bond organic framework material has excellent thermal stability and acid-base stability, and can be used for preparing the fluorescent hydrogen bond organic framework material based on thieno [3, 2-b] thiophene. The material is a high-elasticity material capable of cyclically regenerating, adsorbing and separating a mixed solution of toluene and methylcyclohexane.

The invention discloses a method for catalyzing dehydrogenation of methylcyclohexane by using a high-entropy alloy supported catalyst, which comprises the following step of: carrying out dehydrogenation reaction on methylcyclohexane in a fixed bed reactor under the action of a Ni-Cu-Fe-Co / SiO2 catalyst to obtain methylbenzene and hydrogen. According to the catalyst, due to the fact that Fe has good toluene selectivity in the nickel-copper system catalyst, Co has good methyl cyclohexane conversion rate in the nickel-copper system catalyst, the advantages of Fe and Co are coupled through the Ni-Cu-Fe-Co / SiO2 catalyst, compared with the Ni-Cu / SiO2 catalyst, the hydrogen desorption rate is increased, and the hydrogen desorption stability is kept; due to the addition of transition metals Co and Fe, the surface structure of the carrier is changed, the loading active sites of the carrier are enriched, meanwhile, the carrier has the advantages of being high in specific surface area, not prone to carbon deposition, relatively stable in alkaline medium and the like, and strong interaction is generated between the metals, so that a better catalytic effect is obtained.

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.

Disclosed is a concentration ratio measurement method for measuring the concentration ratio of a solution that contains toluene or methylcyclohexane, the concentration ratio measurement method comprising: a step for measuring the absorbance of the solution at a specific wavelength; and a step for calculating the concentration ratio t:m of the concentration t of the toluene to the concentration m of the methylcyclohexane on the basis of a calibration curve that is recorded in advance on the basis of the absorbance. The specific wavelength is at least one wavelength or wavelength range in the wavelength range of 1,120 nm to 1,140 nm inclusive, the wavelength range of 1,190 nm to 1,230 nm inclusive, the wavelength range of 1,620 nm to 1,680 nm inclusive, the wavelength range of 1,730 nm to 1,850 nm inclusive, the wavelength range of 1,800 nm to 2,050 nm inclusive, the wavelength range of 2,150 nm to 2,180 nm inclusive, and the wavelength range of 2,360 nm to 2,420 nm inclusive.

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.

In various embodiments, the present disclosure relates to compositions and methods for preventing or treating cancer, preventing, treating or inhibiting viral or microbial infection or replication, or preventing, treating or inhibiting other diseases. In some embodiments, the composition includes at least one of an arginine mimetic (TA-R) or a histidine mimetic (TA-H), or an application thereof. In some embodiments, the at least one of TA-R or TA-H is TA-R, which may include, but is not limited to, trans-4-guanidine methylcyclohexanecarboxylic acid (TA-R1), amino (((((1r, 4r)-4-(methoxycarbonyl) cyclohexyl) methyl) amino) methylenimine chloride (TA-R1-OMe), amino ((((1r, 4r)-4-(methoxycarbonyl) cyclohexyl) methyl) amino) methylenimine chloride (TA-R), and TA-H (TA-R). (3-(methoxycarbonyl) cyclohexyl) methyl) amino) methyleneimine chloride (TA-R2), cis-amino (((3-carboxycyclohexyl) methyl) amino) methyleneimine chloride (TA-R3), cis-amino (((3 (methoxycarbonyl) cyclohexyl) methyl) amino) methyleneimine chloride (TA-R3-OMe) and cis-3-(guanidinyl) cyclopentane-1-formic acid (TA-R4), and the compound is prepared from the following raw materials in parts by weight: (4r, 4r)-4-carboxycyclohexyl) amino) methyleneimine chloride (TA-R2), (3r, 4r)-4-carboxycyclohexyl) amino) methyleneimine chloride (TA-R3), (3r, 4r)-4-carboxycyclohexyl) amino) methyleneimine Compounds having cycloalkanes containing two or more functional groups other than cycloalkanes, derivatives thereof, salts thereof, and combinations thereof.

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 a method for (masking or) making it difficult to sense the odor of sotolon without affecting the taste (flavor) of food and beverages, and to a flavoring composition that can be suitably used to mask the deterioration odor of food and beverages. The present invention can suppress the odor of sotolon without impairing the taste of a product by using, at specific concentrations in food and beverages, β-caryophyllene oxide, ethyl acetoacetate, methyl isovalerate, ethyl valerate, triethyl citrate, eugenol, hexyl octanoate, bornyl acetate, γ-methyl ionone, 1,4-cineole, 3,7-dimethyl-2-methylene-6-octen-1-ol, 8-decenal, N-(2-hydroxy-2-phenylethyl)-2-isopropyl-5,5-dimethylcyclohexane-1-carboxamide, mustakone, and (2E)-4-methyl-2,4-tridecadienal.

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".