39results about How to "Avoid hydrogenation" patented technology

A process for purifying a crude furan 2,5-dicarboxylic acid composition (cFDCA) by hydrogenation of a FDCA composition dissolved in a hydrogenation solvent such as water, and hydrogenating under mild conditions, such as at a temperature within a range of 130° C. to 225° C. by contacting the solvated FDCA composition with hydrogen in the presence of a hydrogenation catalyst under a hydrogen partial pressure within a range of 10 psi to 900 psi. A product FDCA composition is produced having a low amount of tetrahydrofuran dicarboxylic acid, a low b*, and a low amount of 5-formyl furan-2-carboxylic acid (FFCA).

A process for purifying a crude furan 2,5-dicarboxylic acid composition (cFDCA) by hydrogenation of a FDCA composition dissolved in a hydrogenation solvent such as water, and hydrogenating under mild conditions, such as at a temperature within a range of 130° C. to 225° C. by contacting the solvated FDCA composition with hydrogen in the presence of a hydrogenation catalyst under a hydrogen partial pressure within a range of 10 psi to 900 psi. A product FDCA composition is produced having a low amount of tetrahydrofuran dicarboxylic acid, a low b*, and a low amount of 5-formyl furan-2-carboxylic acid (FFCA).

A coupling method for preparing ª†-butyrolactone and cyclohexanone, carrying out integral reaction with the mixture of cyclohexanol and anhydride under the condition of gas phase, existence of additional hydrogen or no additional hydrogen, proper temperature and hydrogen catalyst. The invention is characterized compared with current technology by the integral reaction of hydrogenation and dehydrogenation, low energy consumption, no need for hydrogenation or hydrogen recovery, low producing cost, high selectivity and recovery rate, simple preparing process and easy-to-operate.

The invention discloses a preparation method of a bi-functional catalyst of a (Ru / MeOx)@MeOx core-shell structure. The method is characterized in that a center suitable for surface catalyzing is formed by core phase Ru / MeOx and shell phase m-MeOx. A ruthenium-based catalyst prepared by the method has high dispersing performance, so that benzene is dissociated and absorbed more easily at a lower temperature to improve the conversion rate of the benzene;the cyclohexene is allowed to be desorbed on a shell by a hydrophilic m-MeOx shell phase to prevent further hydrogenation and improve the selectivity of the cyclohexene, the loss of activated species can be reduced by the core-shell structure to allow the catalyst to be more stable, the mass transfer resistance can be reduced, the excellent composite performance can be applied to part of hydrogenation cyclohexene reaction of benzene, and extremely high selectivity and yield are obtained. The preparation method is simple, the conditions are mild, the repeating is easy, and the method is suitable for large-scale industrial production.

The invention discloses a production method for pre-melted slag for small-batch electroslag remelting. The production method comprises the steps that firstly, a slag melting bag with the volume being300 kg is selected and used; secondly, pre-melted slag raw materials are taken to be preheated and baked in a slag baking furnace; thirdly, the baked pre-melted slag raw materials with the weight being smaller than or equal to 300 kg in the second step are placed in the slag melting bag in the first step, a double-pole series connection electroslag furnace is used for arc strike for slag melting in the slag melting bag, and after slag melting is over, the slag liquid is poured into a steel tank to be cooled and solidified; and fourthly, slag blocks solidified in the third step are crushed through a small crusher, and the slag blocks serve as pre-melted slag for electroslag remelting after being weighed. The double-pole series connection electroslag furnace is utilized for slag melting in the slag melting bag, production of small-batch pre-melted slag with the weight being smaller than or equal to 300 kg is achieved, and the problem that pre-melted slag for the small-batch test steel grade is hard to produce and purchase is solved. The method is simple, convenient to use and worthy of popularization and application.

A purified acid composition including 2,5-furandicarboxylic acid is prepared by a process including a) providing an acid composition solution of a crude acid composition in a polar solvent, the crude acid composition including 2,5-furandicarboxylic acid (FDCA) and 2-formyl-furan-5-carboxylic acid (FFCA); b) contacting the acid composition solution with hydrogen in the presence of a hydrogenation catalyst to hydrogenate FFCA to hydrogenation products, such that the hydrogenation products contain a minor amount of 2-methyl-furan-5-carboxylic acid (MFA) or no MFA, yielding a hydrogenated solution; c) separating at least a portion of the FDCA from the hydrogenated solution by crystallization.

The invention relates to a production method for effectively controlling gas content in beam blank. The production method comprises processes of raw material pre-treating, converter smelting, deoxidation alloying, and refining, wherein the materials maintain dry, the process of adding slag charge is moved forward to avoid adding material operation 3 minutes before the terminal point; the process of modifying converter slag is moved backward, synthesis slag is added on top of the steel slag after the converter furnace has been stocked with steels other than going into the converter furnace with the steel water, synthesis slag is subjected to a ultra-high-temperature baking by utilizing the steel slag to maximumly reduce the water in the synthesis slag and the crystal water contained by the synthesis slag; electrode powder replaces carbon powder to match with carbon in the refining process to reduce the effect of carbon matching on molten steel hydrogenation. The production method can effectively control hydrogen addition in production process, reduces the hydrogen content in molten steel, makes the hydrogen content in the steel stay in a range of 1 to 3 ppm, reduces casting blank pinhole defects, and improves casting blank yield rate.

In a nuclear fuel rod a cladding tube is provided having a closed inner space and manufactured from at least one of the materials in the group zirconium and a zirconium-based alloy, and a pile of nuclear fuel pellets arranged in the inner space in the cladding tube. The nuclear fuel pellets fill part of the inner space. A fill gas is arranged in the closed inner space to fill the rest of the inner space. The internal pressure of the fill gas in the nuclear fuel rod amounts to at least 2 bar (abs) or at least 10 bar (abs). The fill gas contains a proportion of inert gas a proportion of carbon monoxide that is greater than 3 volume percent of the fill gas or greater than 2 volume percent of the fill gas.

The invention particularly relates to a nitrogen-filling electroslag process for a cavity of a nitrogen-containing steel hollow blank, which is different from a common process in which nitrogen is added into an electrode blank of nitrogen-containing steel and then electroslag is carried out. The process is characterized in that nitrogen is not added during smelting of an electrode blank, a nitrogen-free hollow electrode blank is adopted, nitrogen is injected from a reserved hole during electroslag, nitrogen is added into steel through the physical and chemical reaction of nitrogen and steel slag, the nitrogen flow is controlled according to the nitrogen content of different steel types, and alloying of the nitrogen element is completed in the electroslag remelting process. The process can be applied to common electroslag equipment only, and a special pressurizing electroslag furnace high in price does not need to be arranged. Due to the fact that the blank is a hollow blank, the hot spot is not in the center of a molten pool, the shape of an electroslag molten pool is greatly improved, the molten pool tends to be in a flat state, the consistency of internal and external crystalline states of an ingot is higher, redundant nitrogen overflows from the periphery to form a protective atmosphere, oxygen increasing and hydrogen increasing of molten steel are avoided, the alloying target of the nitrogen element can be easily achieved, and the quality of the electroslag ingot can be improved.

The invention provides a multipurpose environment-friendly cleaning paste and a preparation method thereof. The multipurpose environment-friendly cleaning paste comprises, by weight, 5-15% of stearic acid, 4-10% of palm oil, 4-10% of coconut oil, 0.8-2% of sodium hydroxide, 0.1-0.5% of potassium hydroxide, 0.2-0.8% of soda ash, 0.8-2% of peregal O, 0.8-2% of tween-20, 0.8-2% of tween-80, 5-15% of carnauba wax, 15-20% of water-soluble silicone oil, 8-15% of OP-10, 0.2-0.8% of preservative, 0.1-0.5% of essence and 20-45% of purified water. The multipurpose environment-friendly cleaning paste has the unique advantages of being green, environment-friendly, free of corrosion and foreign smell and strong in detergency, sterilizing, polishing, waxing and saving water and time. Besides, the multipurpose environment-friendly cleaning paste removes dust, leaves no trace and is long in duration time, simple to manufacture, practical and simple and convenient to operate and use.

The invention belongs to the technical field of organic synthesis and chemical catalysis, and discloses a large-steric-hindrance N-heterocyclic carbene palladium complex, a preparation method thereof, application of the large-steric-hindrance N-heterocyclic carbene palladium complex to efficient catalysis of C-N coupling reaction at room temperature, and a synthesis method of Sonidegib based on the large-steric-hindrance N-heterocyclic carbene palladium complex. According to the structure of the large-steric-hindrance nitrogen heterocyclic carbene palladium complex, diphenyl imidazole serves as a main ligand framework, functionalized allyl serves as an auxiliary ligand, and the functionalized allyl is introduced beside a metal center of a catalyst to serve as the auxiliary ligand, so that the large-steric-hindrance nitrogen heterocyclic carbene palladium complex has remarkably improved catalytic activity and stability and can be applied to efficient catalysis of C-N coupling reaction; and especially, the catalyst can efficiently catalyze C-N coupling reaction at room temperature, and the yield can reach 99%. The invention also provides a three-step method for synthesizing the Sonidegib at room temperature by taking aryl / aliphatic amine and aryl chloride as reactants under the catalysis of a palladium catalytic system, the synthesis method provided by the invention has few steps, and the total yield can be up to 74.5%.

The invention relates to a preparation method and application of a Pt nanoparticle-loaded biochar catalyst, and belongs to the technical field of catalysts. According to the catalyst, biochar is takenas a carrier, and Pt nanoparticles are loaded; Pt nanoparticles are used as active sites, the loading capacity of the Pt nanoparticles is 1-10wt.%, and the particle size of the Pt nanoparticles is 1-3nm. The carrier and the Pt nanoparticles are combined through an impregnation method, the operation is simple, the cost is low, the Pt nanoparticles are uniformly distributed on the carrier, the sizeof the Pt nanoparticles is small, and the utilization rate is higher.

The invention discloses a preparation method of an aluminum-calcium multifunctional slag washing material, and belongs to the technical field of steel smelting. The preparation method of the aluminum-calcium multifunctional slag washing material comprises the following steps: S1, preparing raw materials; S2, drying; and S3, mixing. In the step S1, the raw materials comprises, by mass, 5%-20% of Al, 10%-40% of Al2O3, 30%-50% of CaO and 5%-20% of an additive; in the step S2, the CaO is put into a drying box and dried; and in the step S3, the Al and the Al2O3 are crushed until the particle size is less than 5mm, the CaO is crushed until the particle size is less than 60mm, and the additive is added for mixing. According to the preparation method, finished products and the raw materials do not contain polluting elements, so that the safety and the environmental protection property are remarkable; and a high-temperature melting environment is not needed in the preparation process, so that the energy digestion is reduced, and safety is further improved.

The invention discloses a slag system for electroslag remelting, which belongs to the technical field of electroslag metallurgy. The composition and mass percentage of the slag system for electroslag remelting are: CaF2: 50-60%, CaO: 5-20%, SiO2 : 20-35%, Al2O3: 5-15%, and the rest are unavoidable impurities. Compared with the conventional slag material, the material of the present invention reduces the content of CaO and Al2O3, increases the percentage content of SiO2, and has low air permeability of the slag, which is beneficial to prevent hydrogenation, especially in the humid rainy season. The slag composition is conducive to keeping the slag resistance constant, and the melting point is low, and the power consumption is reduced during remelting. Deformable silicate-type inclusions with small size, thus improving the fatigue properties of the steel.

The invention discloses a production method for pre-melted slag for small-batch electroslag remelting. The production method comprises the steps that firstly, a slag melting bag with the volume being300 kg is selected and used; secondly, pre-melted slag raw materials are taken to be preheated and baked in a slag baking furnace; thirdly, the baked pre-melted slag raw materials with the weight being smaller than or equal to 300 kg in the second step are placed in the slag melting bag in the first step, a double-pole series connection electroslag furnace is used for arc strike for slag melting in the slag melting bag, and after slag melting is over, the slag liquid is poured into a steel tank to be cooled and solidified; and fourthly, slag blocks solidified in the third step are crushed through a small crusher, and the slag blocks serve as pre-melted slag for electroslag remelting after being weighed. The double-pole series connection electroslag furnace is utilized for slag melting in the slag melting bag, production of small-batch pre-melted slag with the weight being smaller than or equal to 300 kg is achieved, and the problem that pre-melted slag for the small-batch test steel grade is hard to produce and purchase is solved. The method is simple, convenient to use and worthy of popularization and application.

The invention belongs to the technical field of reactor engineering stress corrosion, and discloses a method for alleviating stress corrosion of a pressurized-water-reactor primary-loop structure material. The method comprises adding a noble metal salt solution into a coolant of a pressurized-water-reactor primary loop, wherein the concentration scope of the noble metal salt solution in the coolant is 10-1000 mu g / Kg, the injection amount is 1-100 mu g / day, and the noble metal salt solution is a salt solution of one or a mixture of Pt and Rh. The method possesses the advantages of being capable of alleviating the electrochemical corrosion potential at the surface of the pressurized-water-reactor primary-loop structure material, improving the stress corrosion resistance of the structure material and prolonging the service life of the structure material.