17results about How to "Improve hydrogenation performance" patented technology

The invention relates to a multi-section quench trickle bed reaction system and reaction method for liquid phase hydrogenation of aldehyde and ketone, the system comprises a multi-section quench liquid phase hydrogenation reactor filled with at least two sections of catalyst bed layers, a product circulating liquid inlet is arranged above each section of catalyst bed layer and is used for introducing a product circulating liquid into the corresponding catalyst bed layer; the adiabatic temperature rise of each section of the catalyst bed layer of the reactor is independently controlled by controlling the flow and the temperature of the circulating quenching liquid of each section of the catalyst bed layer; the method can effectively reduce the adiabatic temperature rise of the catalyst bed layer, prolong the service life of the catalyst, reduce the occurrence of side reactions, improve the product quality and yield, reduce the circulation volume of the liquid-phase product, and reduce the energy consumption. And a better hydrogenation effect can be realized by adopting a single trickle bed reactor, so that the equipment investment is reduced.

The invention belongs to the field of material preparation and chemical engineering, and particularly relates to an N-doped modified MOFs (Metal-Organic Frameworks) derived core-shell nanoreactor as well as a preparation method and application thereof. The preparation method comprises the following steps: taking cobalt as a node metal, synthesizing an N-doped modified MOFs material with an organic ligand and a nitrogen source through a hydrothermal reaction, then coating the surface of the material with porous silicon dioxide, and preparing the N-doped modified MOFs derived core-shell nanoreactor through a two-step calcination method. The MOFs derived core-shell nanoreactor prepared by the invention has a large specific surface area, a rich pore structure and excellent catalytic activity and stability, and is high in catalytic activity, good in recycling stability and suitable for large-scale popularization and application when being used as a catalyst for alpha, beta-unsaturated aldehyde transfer hydrogenation.

The invention relates to a method for preparing 4, 4 '-diaminodiphenyl ether. According to the method, 4, 4 '-dinitrodiphenyl ether is used as an initial raw material, and 4, 4'-diaminodiphenyl ether is prepared through catalytic hydrogenation reduction of a supported catalyst; in the preparation of the catalyst, the dispersion degree of the metal active component on the carrier is improved by virtue of the membrane dispersion microreactor on the premise of not using a surfactant, the metal dosage is reduced, the supported structure is integrally formed, and continuous production of the catalyst precursor is realized. The preparation process provided by the invention is more green and efficient, is applied to hydrogenation reduction of 4, 4 '-dinitrodiphenyl ether under mild reaction conditions, shows excellent performance, and reduces the production cost.

The application discloses a method for cracking tar into high value-added products, which adopts a route of separating light components by fractional distillation and then hydrogenating heavy components, so that the yield of target products can be affected by hydrogenation of naphthalene, methyl naphthalene and the like below 250 DEG C in the process of hydrocracking, and on the other hand, the components below 250 DEG C account for about 30% to 50%, so that the hydrogen consumption in the subsequent hydrocracking can be reduced by separating the components in advance. After the heavy fraction is subjected to hydrocracking, part of polycyclic aromatic hydrocarbons in the heavy fraction can be cracked into part of monocyclic aromatic hydrocarbons, which can be used for producing aromatic solvent oil, so that the light fraction in the hydrocracking product is separated and mixed into the light fraction generated by pre-fractionation, and the next step processing is carried out, so that the yield of high value-added products can be further improved.

The application provides a titanium dioxide type low-temperature hydrogenolysis catalyst and a preparation method and application thereof. The catalyst comprises a titanium dioxide carrier and an active component loaded on the titanium dioxide carrier, and the active component comprises scandium oxide and tungsten oxide. The preparation method of the catalyst comprises the following steps: dipping the titanium dioxide carrier in a mixed solution of scandium salt and tungsten salt for a period of time, so that the scandium salt and the tungsten salt are loaded on the titanium dioxide carrier; and then drying and calcining the titanium dioxide carrier loaded with the scandium salt and the tungsten salt, to obtain the titanium dioxide type low-temperature hydrogenolysis catalyst. The catalyst has good sulfur dioxide hydrogenation activity and organic sulfur hydrolysis activity, and can be applied to a process for treating sulfur recovery tail gas at a low temperature of 210-220 DEG C.

The invention discloses a waste wind power lubricating oil hydrogenation catalyst, a preparation method and its application in waste wind power lubricating oil regeneration base oil, belonging to the technical field of waste wind power lubricating oil regeneration. The catalyst is a shell-type Pd@γ‑Al 2 O 3 Catalyst. The use of the catalyst in the regeneration of base oil from waste wind power lubricating oil comprises: subjecting the waste wind power lubricating oil to a vacuum distillation and a low-temperature short-range critical molecular distillation in sequence to obtain a crude base oil; adding the crude base oil and the catalyst to a reactor for kettle-type hydrogenation and quality improvement to obtain a regenerated base oil. The present invention adopts a low-temperature short-range critical molecular distillation combined with kettle-type hydrogenation refining and quality improvement, which is simple to prepare and not easy to be poisoned. It can effectively reduce the coking and scaling problems of waste wind power lubricating oil on the inner wall of the evaporator, and can greatly extend the working time of the device. Shell-type Pd@γ‑Al 2 O 3 The catalyst can greatly reduce the amount of Pd used, improve the Pd dispersion and atomic utilization, and enhance the hydrogenation effect.

This invention discloses a magnesium-aluminum layered double hydroxide (MLD)-based solid alkali-supported ruthenium catalyst, its preparation method, and its application, belonging to the field of chemical catalytic materials technology. This invention uses magnesium-aluminum MLD as a support, metallic ruthenium as the hydrogenation active component, and magnesium oxide as the alkaline component. The preparation method involves mixing an aqueous dispersion of magnesium-aluminum MLD with frozen magnesium salt and an alkaline solution. The core step is to utilize a freeze-thaw process to perform high-dispersion exfoliation and hydrolysis reactions between the magnesium-aluminum MLD layers, generating magnesium hydroxide attached to the support. This magnesium hydroxide is then pyrolyzed to form a MgO / LDHs solid alkali catalyst precursor. This precursor is dispersed in water, mixed with an aqueous ruthenium salt solution, and reduced with a reducing agent solution to obtain the final catalyst. The freeze-thaw process of this invention significantly improves the dispersibility of the active component, achieving a catalyst specific surface area of ​​185 m² / g and a pore volume of 0.28 m³ / g. Applied to the selective hydrogenation reaction of nitrobenzene using methanol as a hydrogen source, no external alkali is required, achieving a nitrobenzene conversion rate of 61.50% and an aniline selectivity of 100%.

The present invention discloses a grading method and application of a hydrogenation catalyst. The method includes a hydrodemetallization reaction zone, wherein the hydrodemetallization reaction zone includes at least a first hydrodemetallization reaction zone and a second hydrodemetallization reaction zone which are sequentially connected in series along the direction of the logistics, and the catalyst loaded in the second hydrodemetallization reaction zone is a second hydrodemetallization catalyst, wherein at least one catalyst is loaded; and the active metal component of the second hydrodemetallization catalyst is distributed in a "protein type"; and the second hydrodemetallization catalyst adopts a specific loading method. The grading method is applied to the heavy oil hydrogenation reaction, which can reduce the deposition of metal impurities and carbon deposits on the catalyst, slow down the catalyst deactivation rate, improve the demetallization, desulfurization and residual carbon removal stability of the entire system, and extend the operation cycle of the catalyst.

The invention provides a rhodium-iron bimetallic catalyst as well as a preparation method and application thereof, and relates to the technical field of preparation of carbon dioxide hydrogenation catalysts. A sequential reduction method is adopted for preparation, rhodium atoms are reduced in advance under the condition of a dispersing agent, agglomeration of the rhodium atoms is avoided, the rhodium atoms are evenly dispersed on the surface of a titanium dioxide carrier, iron is further reduced, high-dispersion rhodium-iron bimetallic catalytic active sites are formed, the atom utilization efficiency of active components in the catalyst is improved, and the catalytic activity of the catalyst is improved. The catalyst has the characteristics of high carbon dioxide conversion rate and high methane selectivity in a carbon dioxide methanation reaction.

The invention discloses an oil-soluble molybdenum disulfide hydrogenation catalyst and a preparation method thereof. The oil-soluble molybdenum-based catalyst is prepared by mixing and reacting distillate oil in coal tar with sodium hydroxide and an inorganic molybdenum source. The preparation method comprises the following steps: (1) mixing distillate oil of coal tar with deionized water, then adding sodium hydroxide and an inorganic molybdenum source, and stirring to react for 12-36 hours in a nitrogen environment; and (2) adding deionized water into the reaction solution in the step (1), washing for three times, and separating. And (3) dissolving the upper-layer organic phase obtained in the step (2) in an organic solvent, filtering to remove solid particles, then removing the organic solvent through a rotary evaporator, and carrying out vacuum drying to obtain the oil-soluble molybdenum-based catalyst.

This invention discloses a catalyst for the hydrogenation of dry gas to produce low-carbon hydrocarbons and its preparation method. The catalyst comprises a support a of activated magnesium oxide and a support b of alumina; the active components are group VIB metal sulfides and group VIII metal sulfides, and the active promoters are one or more of Cu, Ag, Ni, Co, W, and Mo; the total acid content of the catalyst is 0.1~0.3 mmol / g, of which strong acids at 400-500℃ account for 5-15%, moderately strong acids at 250-400℃ account for 10-20%, and weak acids at 150-250℃ account for 65%-85%. The preparation method is as follows: the alumina and magnesium oxide impregnated with the active components are separately calcined at high temperatures, then mixed, and after molding, drying, and calcination, the catalyst is obtained. The catalyst prepared by this method exhibits excellent CO2 removal performance and does not have a particularly adverse effect on the removal of organic sulfur impurities and the hydrogenation saturation reaction of olefins, enabling the hydrogenation of dry gas with high CO2 content to produce low-carbon hydrocarbons.

The application discloses a kind of carbon four alkylation raw material pretreatment catalyst and preparation method and pretreatment method, belong to carbon four light hydrocarbon processing technical field.Its technical scheme is: carbon four alkylation raw material first enters extraction column and is extracted, water-washed carbon four alkylation raw material is extracted from top and enters catalytic rectification column, catalytic rectification column is divided into rectification section, reaction section and stripping section from top to bottom, catalyst of the application is placed in reaction section;Carbon four alkylation raw material enters reaction section, butadiene therein and hydrogen gas occur reaction, and 2-butene generated in the reaction process is removed constantly;Catalytic rectification column bottom is extracted and pretreated carbon four alkylation raw material.The pretreatment method of the application carries out corresponding desulfurization, denitrogenation, deoxidant and diene hydrocarbon etc.pretreatment before carbon four alkylation raw material enters alkylation device, meets the requirement of alkylation feed to raw material impurity, improves alkylation oil quality, reduces the material loss of alkylation process.

The invention discloses a preparation method of a ZIF-8 coated supported palladium catalyst and application thereof in a selective hydrogenation reaction of acetylene. The catalyst consists of a carrier, an active component loaded on the carrier and a film selectively coating the active component, wherein the active component is metal palladium, the carrier is α-Al2O3, the film selectively coating Pd / Al2O3 is a zeolite imidazole framework ZIF-8, the regular pore structure of ZIF-8 separates Pd active sites with a molecular-level grid framework, and can significantly improve ethylene selectivity; the molecular-level network does not cover the active sites, and substantially maintains a hydrogenation activity equivalent to that of Pd / Al2O3, and can simultaneously take into account acetylene hydrogenation activity and ethylene selectivity in the selective hydrogenation reaction of acetylene. The preparation method of the invention is simple, easy to operate, and is conducive to industrial large-scale production.

The invention discloses a tungsten oxide loaded carbon coated nickel catalyst and a preparation method and application thereof, the catalyst comprises a carrier and an active component loaded on the carrier, the carrier is tungsten oxide containing positive pentavalent tungsten ions and positive hexavalent tungsten ions at the same time, and the active component is carbon layer coated nickel. The catalyst can be applied to preparation of ethylene glycol through catalytic conversion of cellulose, 100% conversion of the cellulose can be achieved in a water solvent only in the initial hydrogen atmosphere, the yield of ethylene glycol monomers can reach 75%, one-step conversion of the cellulose to high-value fuel is completed, and the catalyst is suitable for industrial production. The preparation and reaction processes of the catalyst have the characteristics of high efficiency, greenness, economy and reproducibility, and the industrial application prospect is wide.

The present application discloses a kind of condensed ring aromatic hydrocarbon hydrogenation catalyst and its preparation method and application.The catalyst includes porous carrier, active metal component and auxiliary component, the active metal component is selected from at least one of La system, group VIB or group VIII metal element, the auxiliary component is selected from at least one of group IIA metal element, the catalyst, with X-ray photoelectron spectroscopy characterization, metal component M a+ (a>1) is reduced to M (a‑1)+ The ratio of M a+ Total reduction of at least 80%, preferably at least 90%.The catalyst of the present application is used for condensed ring aromatic hydrocarbon hydrogenation reaction, especially naphthalene and naphthalene hydrogenation reaction, with the characteristics of improving the conversion rate of reactants, the selectivity of target product.

The invention discloses a method for preparing a core-shell structure hydrocracking catalyst, comprising: (1) adding a sodium aluminate solution, a sodium molybdate solution and a CO2 gas to a Ni-containing solution A in parallel to perform a first gelling reaction, aging, obtaining a first slurry, filtering to obtain a filter cake, and then mixing with an aluminum salt and an organic alcohol aqueous solution to form a slurry; (2) the Ni-containing solution B, a sodium tungstate solution, a precipitant and the slurry in parallel to form a gel, aging, and generating a second slurry; (3) aging the second slurry, drying, rolling and mixing with a β molecular sieve, and molding to obtain a molded product; (4) soaking the molded product in an organic acid solution of a carboxylic acid polymer and / or an organic phosphonic acid compound, desalting, and obtaining a catalyst. The catalyst prepared by the method of the invention has a large pore volume and pore size, small active metal oxide particles, excellent isomerization performance and aromatic conversion capacity, and is suitable for the hydrocracking process of producing specialty oils and lubricating oil base oils.

This invention relates to the field of methanation catalysts, disclosing a methanation catalyst, its preparation method, and its applications. The method includes: reducing a nickel precursor in the presence of water using a reducing agent; then, in the presence of a protective agent, mixing the resulting reduction product with a dispersant and allowing it to stand and separate into layers to form a layered liquid; wherein the protective agent is a hydrophobic inert liquid; the layered liquid comprises an upper layer and a lower layer, the upper layer containing the protective agent, and the lower layer containing water and catalyst particles, the catalyst particles containing amorphous nickel and the dispersant; adjusting the pH of the lower layer to 7-9, and then removing the water from the lower layer, so that the protective agent coats the catalyst particles. The active component in this methanation catalyst is amorphous nickel, which, compared to catalysts with crystalline nickel as the active component, improves the hydrogenation capacity of the active component. Furthermore, this methanation catalyst is itself in a reduced state, requiring no reduction before use, making it more suitable for slurry bed reactors.