22results about How to "Improve hydrogenation efficiency" patented technology

The invention provides a preparation method of a hydrogenated cycloolefin polymer, which comprises the following steps: reacting a cycloolefin polymer with hydrogen in the presence of a hydrogenation catalyst and a hydrogenation aid to obtain the hydrogenated cycloolefin polymer, the hydrogenation auxiliary agent is selected from one or more of aliphatic dibasic acid esters, phthalate esters and benzene polyacid esters. Compared with the prior art, in the presence of the hydrogenation catalyst and the hydrogenation auxiliary agent, the cycloolefin polymer and the hydrogen are subjected to hydrogenation reaction, and an induced dipole is induced in the adjacent cycloolefin polymer through the hydrogenation auxiliary agent molecule with an inherent dipole; the molecular attraction between the induced dipole and the inherent dipole destroys the entanglement of the original molecular chain, and the friction force between the cycloolefin polymer molecules is reduced, so that the viscosity between the polymers is reduced, and the mass transfer effect of the reaction is improved; meanwhile, intramolecular electron conjugation can be inhibited, double bonds in molecules in the hydrogenation process can be damaged more easily, the hydrogenation efficiency is improved, and then the production efficiency is improved.

This invention relates to the field of rubber hydrogenation, and discloses a stirred tank reactor and its application in rubber hydrogenation, as well as a batch hydrogenation method for nitrile rubber. The stirred tank reactor includes a cylindrical body and a stirrer and hollow finger-shaped baffles placed inside the body. The stirrer includes a hollow stirring shaft and a stirring paddle mounted on the shaft. A hydrogen inlet is located at the top of the hollow stirring shaft, and an annular gas distributor is located at the bottom. The hollow finger-shaped baffles include a hollow straight tube and at least two short, downward-sloping straight tubes arranged along the bottom of the tube. The bottom of the hollow straight tube is connected to a hydrogen inlet pipe at the bottom of the cylindrical body. The multiple hollow finger-shaped baffles within the stirred tank reactor enable good dispersion and mixing of hydrogen in the rubber solution, and, together with the hollow stirring shaft and gas distributor, achieve a top-to-bottom self-circulation of hydrogen in the gas phase space within the reactor, thereby improving the hydrogenation efficiency of the rubber hydrogenation reaction.

The invention provides a method for preparing hydrogenated rubber latex by a one-step method, which comprises the following steps: emulsifying a comonomer and a diene monomer in the presence of a surfactant, a hydrogenation catalyst, other auxiliaries and water, lowering the temperature, adding an initiator, and introducing hydrogen with certain pressure to carry out prepolymerization reaction, and raising the temperature to carry out polymerization and hydrogenation reactions to obtain the hydrogenated rubber latex. According to the hydrogenated rubber latex prepared by prepolymerizing the diene monomer and the copolymerizable monomer at low temperature and certain hydrogen pressure and then raising the temperature to continue the reaction, nano-particle micelles in the latex are stable in performance, the nano-micelles are good in size uniformity, small in particle size distribution range, small in particle size and not prone to demulsification, and the preparation method is simple, convenient to operate and suitable for industrial production. The industrialization is easy to realize.

The invention relates to the technical field of hydrogen peroxide production, and discloses a method for preparing high-concentration hydrogen peroxide, which comprises the following steps: fully mixing low-concentration hydrogen peroxide with the concentration of 34-42wt% with an oxidation liquid with higher hydrogen peroxide content after precision filtration, and dissolving part of hydrogen peroxide in the oxidation liquid into the low-concentration hydrogen peroxide in the mixing process, the method comprises the following steps of: firstly, separating an oil phase from a water phase through a separator to obtain a high-concentration hydrogen peroxide crude product with the concentration of 48-56wt%, and separating to remove organic matters entrained in the high-concentration hydrogen peroxide crude product to obtain a high-concentration hydrogen peroxide finished product with the concentration close to 50wt%. The high-concentration hydrogen peroxide with the concentration close to 50 wt% can be prepared without a concentration process, the production cost of the high-concentration hydrogen peroxide can be reduced, and the process safety can be improved.

The invention discloses a catalyst and a preparation method thereof, and a system and a method for continuously preparing methylhexahydrophthalic anhydride, and belongs to the technical field of methylhexahydrophthalic anhydride preparation. The catalyst has a double-layer structure, the outer layer is a stainless steel hollow structure, and the inner layer is a Raney nickel-cobalt metal structure. The catalyst not only has high activity and high hydrogenation efficiency of a Raney nickel catalyst, but also has the advantages of high strength, long service life, strong stability and the like, and can be used for preparing methylhexahydrophthalic anhydride. Besides, according to the system for continuously preparing methylhexahydrophthalic anhydride provided by the invention, the hydrogenation process is divided into two sections, and the catalyst is used for the second-section hydrogenation process, so that higher hydrogenation efficiency, shorter hydrogenation residence time and higher production efficiency can be obtained in this way, the saturation degree of a hydrogenation product is high, and the yield of the product is increased. The method has the advantages of low iodine value, light color number, high purity, higher yield, few byproducts and the like.

This invention discloses a working solution for synthesizing hydrogen peroxide via the anthraquinone method, comprising a solvent and a working carrier. The solvent comprises aromatic hydrocarbons, diisobutylmethanol, and terephthalamide derivative A. Terephthalamide derivative A, by volume, has C9~C64... 10 The aromatic hydrocarbon comprises 30-95 parts, preferably 60-80 parts; the diisobutylmethanol comprises 2-20 parts, preferably 5-15 parts; and the terephthalamide derivative A comprises 5-30 parts, preferably 5-15 parts; the aromatic hydrocarbon is generally C9-C6. 10 Aromatic hydrocarbons; the working carrier is one or more of anthraquinone and its derivatives. This working solution exhibits excellent solubility and mass transfer capabilities for hydrogen, anthraquinone, and hydroanthraquinone, with a hydrogenation efficiency exceeding 13 g / L. It has low miscibility with water, good extraction and separation effects, and stable physicochemical properties. It can improve the production efficiency of the anthraquinone process for producing hydrogen peroxide and has promising prospects for industrial application.

The present invention provides a system for recovering protein in a production process of an ultrahigh maltose syrup, including a saccharification tank, an enzyme preparation tank, a first plate heat exchanger, a second plate heat exchanger, a plate and frame filter, a buffer tank and a rotary drum filter. The present invention further provides a method of recovering protein by using the system. After the sugar liquid in the saccharification tank is stood, the protein floats at the upper part of the saccharification tank and the lower liquid is clear and transparent and thus the sugar liquid can be directly filtered. When the saccharification tank is discharged, the lower liquid is firstly discharged with the remaining liquid being bottoms containing protein. During a production process, enzymatic hydrolysis is performed for the sugar liquid containing protein before filtration to improve the filtration effect of the sugar liquid. Assisted by the plate and frame filter, protein can be recovered. The present invention improves the economic benefits, reduces the production costs, and thus solves the problem of difficulty in recovering protein in a production process of an ultrahigh maltose syrup.

The present application relates to a kind of methyl hexahydrophthalic anhydride preparation method, comprising the following steps: with the refined methyl tetrahydrophthalic anhydride that is not isomerized as raw material, raw material and hydrogen are sent into ebullated bed hydrogenation reactor, then special catalyst is added to carry out hydrogenation;Waste hydrogen and methyl tetrahydrophthalic anhydride light component are taken out by gas phase from the top of reactor, waste catalyst is taken out from the bottom of reactor, and the hydrogenation product crude methyl hexahydrophthalic anhydride is taken out by pump control liquid level from the side of reactor;Crude methyl hexahydrophthalic anhydride is sent into the separation device with thin film evaporator and is subjected to vacuum distillation, and finished product methyl hexahydrophthalic anhydride is obtained.The catalyst used in the present application has moderate activity, high hydrogenation efficiency;Catalyst and product have no separation process, less loss, low safety risk;Post-treatment process has high heat transfer efficiency, short residence time, low colority;Product has less by-product, high yield, stable acid value and anhydride group content, and excellent performance.

The application discloses a catalytic hydrogenation method of carbon nine resin, and is characterized in that the method comprises the following steps: (1) placing a Pd-W-Yb / silica gel-activated carbon co-precipitation catalyst in the front half of a fixed bed, placing a Co-Ru-Yb / silica gel co-precipitation catalyst in the rear half of the fixed bed, and reducing by hydrogen; (2) catalytically hydrogenating pretreated carbon nine resin in the fixed bed. Compared with the prior art, the catalytic hydrogenation method of carbon nine resin has high catalytic efficiency and simple process, and the catalytic hydrogenation method can obtain a product with good colority and low bromine value.

Disclosed are a method and system for producing hydrogen peroxide, the method comprising : 1) carrying out a hydrogenation reaction on a working solution containing an alkyl anthraquinone in the presence of hydrogenation catalyst particles and hydrogen, separating the resultant to obtain a circulating slurry and a hydrogenated solution, and recycling the circulating slurry; 2) dividing the hydrogenated solution into two streams, and regenerating the first stream of the hydrogenated solution to obtain a regenerated hydrogenated solution; 3) contacting the second stream of the hydrogenated solution and the regenerated hydrogenated solution with an oxygen-containing gas for oxidation reaction to obtain an oxidized solution; and 4) carrying out extraction separation on the oxidized solution to obtain an extract liquor containing hydrogen peroxide and a raffinate, and recycling the raffinate. The method can substantially eliminate the temperature difference of the reactor bed, effectively improve the hydrogenation selectivity, plant efficiency and hydrogenation efficiency, and prolong the service life of the hydrogenation catalyst.

The invention relates to the technical field of hydrogen storage and hydrogenation equipment, in particular to an explosion-proof hydrogen storage and hydrogenation pry. The gas storage tank is fixedly arranged at the top of the supporting frame, an observation ladder is arranged on one side of the gas storage tank, a protective fence is arranged on the observation ladder, and an observation part is arranged at the top of the gas storage tank; the connecting assembly is arranged in the gas outlet pipe and the gas filling pipe and is used for quickly and stably connecting the gas outlet pipe and the gas filling pipe; the buffer assembly is arranged in the gas outlet pipe and used for adaptively adjusting the hydrogen pressure at the two ends of the gas outlet pipe, and the adjusting box and the buffer assembly are combined for use, so that the pressure change of hydrogen is effectively adjusted, and the stability and the safety in the hydrogenation process are ensured; due to the quick connection function of the connecting assembly, the operation time in the hydrogenation process is shortened, the hydrogenation efficiency is improved, the overall structure is simple and reasonable, installation and maintenance are convenient, the device is suitable for various hydrogen filling scenes, and the safety and practicability of equipment are improved.

The present invention discloses a method for chemically modifying a fullerene C60 carrier and its application in electrochemical hydrogenation of soybean oil. The method for chemically modifying a fullerene C60 carrier comprises the following steps: weighing a C60 / Pt catalyst and placing it in a centrifuge tube, adding isopropanol, a dispersant, and an adhesive for ultrasonic treatment to obtain a chemically modified fullerene C60 / Pt catalyst. The present invention utilizes an SPE hydrogenation reactor to hydrogenate soybean oil, and optimizes the oil hydrogenation process from the perspective of chemically modifying the fullerene C60 carrier. Since the chemical method introduces a dispersant to modify the fullerene C60, the adverse effects of the agglomeration of the fullerene C60 itself and the shedding of Pt particles during the hydrogenation process on the hydrogenation reaction can be effectively avoided. As a carbon-based material, fullerene C60 has good electrical conductivity, can provide a higher current density for the catalyst, give full play to the catalytic performance of the Pt particles, and improve the oil hydrogenation efficiency.

The invention provides magnesium hydride powder and a preparation method thereof. The preparation method comprises the following steps: filling a first magnesium particle group and a second magnesium particle group into a reactor, introducing hydrogen, and heating the reactor to a reaction temperature T1 of 305-310 DEG C through an external heating mechanism, so that the second magnesium particle group and at least part of hydrogen are subjected to a first hydrogenation reaction and heat is released; the first magnesium particle group is jointly heated by heat released by the reaction of the second magnesium particle group and hydrogen and an external heating mechanism, the first magnesium particle group and the remaining hydrogen are subjected to a second hydrogenation reaction, the reaction time for converting the first magnesium particle group into magnesium hydride powder is shortened, and the magnesium hydride powder with the preset purity is obtained. According to the preparation method provided by the invention, the problems of insufficient safety, slow hydrogenation kinetics and high energy consumption of a magnesium hydride preparation process in the prior art are effectively solved, and the hydrogenation efficiency is remarkably improved.

The invention relates to the technical field of hydrogen peroxide production, and discloses a method for producing high-concentration hydrogen peroxide through extraction, which comprises the following steps: firstly, carrying out primary extraction on low-concentration hydrogen peroxide and a first oxidation solution with higher hydrogen peroxide content to obtain a high-concentration hydrogen peroxide crude product; the second oxidation liquid obtained through the first extraction is subjected to countercurrent extraction with weakly acidic water to obtain low-concentration hydrogen peroxide, and meanwhile, residual hydrogen peroxide in the second oxidation liquid is completely extracted, so that the concentration of the low-concentration hydrogen peroxide is ensured, and meanwhile, the content of hydrogen peroxide in raffinate obtained through the second extraction does not exceed the standard; the hydrogen peroxide product with the concentration close to 50wt% can be produced without concentration, and compared with a process for producing high-concentration hydrogen peroxide through concentration, the process is mild in operation condition and relatively simple in flow, production energy consumption is reduced, and the process is higher in safety and reliability.

The invention provides a method for preparing hydrogenated rubber latex by a one-step method, which comprises the following step: simultaneously carrying out polymerization and hydrogenation reaction on a diene monomer and a comonomer in the presence of a polymerization initiator, a surfactant and a hydrogenation catalyst to obtain the hydrogenated rubber latex. According to the method, polymerization and hydrogenation reactions are carried out simultaneously, the hydrogenation efficiency is high, and the hydrogenation degree is high; the conversion rate of the monomer is extremely high; and all procedures required from post-treatment of the unsaturated rubber latex to hydrogenation of the unsaturated rubber latex are reduced.

The invention particularly relates to a ZIF-8-derived nitrogen-doped carbon-loaded copper catalyst as well as a preparation method and application of the ZIF-8-derived nitrogen-doped carbon-loaded copper catalyst. The method comprises the following steps that copper acetate, zinc acetate and methyl alcohol are subjected to ultrasonic dissolution and mixed with a methyl alcohol solution of 2-methylimidazole, then stirring, heating, centrifugal washing, freeze drying and roasting reduction are conducted, the Cu / NC catalyst, namely the ZIF-8 derived nitrogen-doped carbon-loaded copper catalyst is prepared, and the loading capacity of copper is 5-20 wt%; according to the invention, products MM and MG are obtained in a dimethyl oxalate hydrogenation path on the prepared ZIF-8 derived nitrogen-doped carbon-loaded copper catalyst for the first time; a metal-nitrogen-carbon synergistic effect exists between the copper nanoparticles and the nitrogen-doped carbon carrier, the chemical state of a Cu component can be effectively adjusted through interaction of copper sites and nitrogen doping sites, on one hand, adsorption and dissociation of DMO molecules are promoted, on the other hand, adsorption and dissociation of hydrogen can be promoted, and then hydrogenation efficiency and product selectivity are improved.

The present application belongs to the technical field of catalyst, and particularly relates to a method for hydrogenation reaction in production of triethylaluminum catalyzed by aluminum hydrogen structure activator. The present application provides a method for hydrogenation reaction in production of triethylaluminum catalyzed by aluminum hydrogen structure activator, which comprises adding triethylaluminum mother liquor and aluminum powder mixture mixed with aluminum hydrogen structure activator in advance into a reaction kettle, heating under stirring, passing in hydrogen and pressurizing, continuously keeping hydrogen passing in during the reaction to ensure that the reaction kettle is in a constant pressure state, and obtaining target product diethylaluminum hydride and hydrogenolysis byproduct ethane after the reaction is completed. The present application provides a hydrogenation reaction with introduction of aluminum hydrogen structure activator, effectively improves the hydrogenation reaction speed and production efficiency, simultaneously reduces by-reactions and production cost, the activator is convenient to add, does not additionally increase process burden, related by-products are easy to remove and do not affect the environment and production safety.

The present invention belongs to the technical field of fuel chemical industry, and provides a kerosene co-refining method. The method comprises the following steps: macro-separating the enriched micro-components from the raw coal to obtain a vitrinite high-enriched coal sample and an inertinite high-enriched coal sample; subjecting the inertinite high-enriched coal sample to catalytic depolymerization treatment, and dividing the product of the catalytic depolymerization treatment into two parts, one part of which is subjected to distillation treatment to obtain a heavy component; the other part is subjected to semi-coke gasification treatment; the heavy component and the heavy oil are mixed to obtain co-refined oil, and the co-refined oil and the vitrinite high-enriched coal sample are mixed to perform a co-refining hydrogenation reaction to obtain a co-refined product. The kerosene co-refining method provided by the present invention greatly expands the restrictions of kerosene co-refining on raw coal, and at the same time, by coupling the catalytic depolymerization technology of the inertinite high-enriched coal sample, the source and quality of the oil sample of kerosene co-refining are broadened, and by using the coal sample by quality, the yield and quality of the kerosene co-refining product are greatly improved.

The invention belongs to the technical field of organic matter synthesis, and particularly relates to a preparation method of Advantame. The polymerization inhibitor is used before the aspartame is added, so that side reaction can be reduced; tetrahydropyrrole is adopted to catalyze formation of an imine intermediate, side reaction is controlled, and the yield of the product is increased; the reaction temperature for generating the imine intermediate is controlled to be a low temperature of-20 to-10 DEG C, and the side reaction is controlled, so that the reaction is safer and more efficient. According to the present invention, the monatomic dispersion catalyst Pd1 / TiO2 is adopted, palladium is dispersed on the TiO2 skeleton as monatomic, such that the contact area with the catalytic substrate can be increased so as to significantly improve the hydrogenation efficiency, and through the secondary hydrogenation reaction, the limitation and the influence of the water produced during the first hydrogenation reaction process on the reaction can be reduced so as to further improve the yield. The method is simple and easy to implement, few in by-products, high in product purity, high in yield and environmentally friendly.

The invention discloses a method for improving the catalytic SBS hydrogenation efficiency of a titanocene catalyst. The method comprises the following steps: obtaining a styrene / butadiene / styrene copolymer glue solution through an anionic polymerization method; carrying out hydrogenation reaction on the styrene / butadiene / styrene copolymer glue solution under the action of a siloxane cocatalyst, dicyclopentadiene titanium dichloride and lithium hydride to obtain a hydrogenated styrene / butadiene / styrene copolymer; by adopting the siloxane cocatalyst, the hydrogenation degree of the high-molecular-weight SBS can reach 98% or above, the problems of chromaticity and smell of the product can be solved, and in addition, a certain anti-sticking effect is achieved.

The invention provides a method for preparing 2,2-dimethylolbutyraldehyde (DMB) and trimethylolpropane (TMP). The method uses formaldehyde, n-butyraldehyde and secondary alcohol as raw materials, and an aldol condensation reaction occurs under the catalyst of an organic base. During the process, a Meerwein-Ponndorf-Verley (MPV) reaction occurs under the catalysis of a catalyst to suppress the occurrence of a Cannizzaro reaction, reduce the generation of formic acid, obtain a condensation reaction liquid of high-content 2,2-dimethylolbutyraldehyde (DMB), and the reaction liquid is hydrogenated to obtain trimethylolpropane (TMP). The method of the present invention has the advantages of high condensation yield, few by-products, high total yield of TMP, and low cost.

The invention discloses a method for hydrogenating a terpene resin, and belongs to the technical field of terpene resin production. The method for hydrogenating a terpene resin comprises the following steps: turpentine oil is catalyzed by aluminum chloride and trimethylsilyl chloride in toluene to obtain a crude terpene resin, a magnetic catalyst is added to the crude terpene resin with stirring, nitrogen is charged to replace the gas three times, hydrogen is charged to replace the gas three times, the temperature is raised to 250-260°C, constant temperature stirring is performed for reaction for 8-10 hours, after the reaction is completed, the product is naturally cooled to room temperature to obtain a product, the magnetic supported catalyst is separated by a magnetic field to obtain a product, the product is impurity-removed by an adsorbent to obtain an impurity-removed product, the impurity-removed product is then subjected to reduced pressure distillation to remove low-boiling impurities, and then cooled to room temperature to obtain a terpene resin. The invention improves the selection of a catalyst for hydrogenation, and efficiently removes ruthenium ions by a self-made adsorbent, thereby ultimately improving the comprehensive performance of the prepared terpene resin.