70results about "Raney catalysts" patented technology

The application discloses a method for preparing 6-hydroxy-8-chlorooctanoic acid ethyl ester by hydrogenation reduction of 6-carbonyl-8-chlorooctanoic acid ethyl ester. The carbonyl group of 6-carbonyl-8-chlorooctanoic acid ethyl ester is reduced to a hydroxyl group through a catalytic hydrogenation reduction reaction under high pressure, so that 6-hydroxy-8-chlorooctanoic acid ethyl ester is obtained. In the reaction process, strong acid, strong base and toxic substances are not involved, the catalyst used can be repeatedly used, the required equipment is not high, the process is simple, the obtained product has high purity and yield, and the method is favorable for large-scale production of enterprises, and provides a new preparation method which is simple and easy to realize, safe and stable, green and environmental protection, low in production cost and high in efficiency, and is suitable for the prior art and actual production.

The invention relates to the technical field of sugar alcohol preparation, and discloses a preparation method of high-purity crystalline maltitol, which comprises the following steps: firstly, by taking corn starch milk as a raw material, preparing ultrahigh-content maltose syrup with the maltose content of more than or equal to 91%, the wheat triose content of less than or equal to 0.4% and the glucose content of less than or equal to 4% through an enzyme conversion method; carrying out hydrogenation reaction on the syrup by adopting a Raney nickel catalyst, and controlling the hydrogenation side reaction to be 2% or below, so as to obtain hydrogenated liquid with maltitol content of more than or equal to 88%; and then, a pigment separation procedure in a traditional process is omitted, and the hydrogenated liquid is directly subjected to decoloration, ion exchange, evaporation concentration, crystallization, centrifugation and drying treatment to finally prepare crystalline maltitol. According to the method, by screening a specific compound enzyme system and finely regulating the pH value and temperature control environment of a saccharification reaction system, the generation of maltose is effectively promoted, and side reactions such as excessive hydrolysis of glucose and reverse synthesis of trisaccharide are inhibited at the same time, so that the high-purity maltose syrup precursor is obtained.

The application provides a catalyst, a preparation method and application thereof. The catalyst comprises a porous substrate and an auxiliary agent arranged on at least part of the surface of the porous substrate, the porous substrate comprises a Raney cobalt material, and the auxiliary agent comprises metallic rhenium, an alkali metal and an alkaline earth metal; wherein the Raney cobalt material comprises a Co-S chemical bond. The catalyst provided by the application has excellent activity, and can effectively improve the conversion rate of dinitrile compounds and the selectivity of diamines.

The invention relates to a process for the manufacturing of biobased 3-methyl-delta-valerolactone (3MdVL) and 3-methyl-1,5-pentanediol (3MPD) via one- pot hydrogenation of anhydromevalonolactone (aMVL) in the presence of a Raney- Nickel catalyst. The hydrogenation occurs without solvent at a temperature from 120ºC-180ºC, preferably at 130ºC-170ºC and a pressure between 15-30 bar, preferably at a pressure between 18 and 22 bar. The hydrogenation time may vary between 3 and 25 hours, preferably between 6 and 24 hours.

The invention relates to a preparation method of 4, 4 '-bis (3-aminophenoxy) biphenyl, and relates to the technical field of organic synthesis. The method comprises the following steps: adding m-fluoronitrobenzene, potassium carbonate, biphenol and a mixed solvent into a water separation device for reaction; after the reaction is finished, filtering, carrying out reduced pressure distillation, adding an ethanol solution of toluene, pulping and filtering; adding pure water into the filter cake for pulping, thermally filtering and drying to obtain an intermediate 1; adding the intermediate 1, a hydrogenation catalyst, a phase transfer catalyst and tetrahydrofuran into an autoclave for reaction, filtering, performing rotary evaporation on filtrate, adding methanol for pulping, filtering and drying to obtain 4, 4 '-bis (3-aminophenoxy) biphenyl; the phase transfer catalyst is prepared from allyl trimethyl ammonium chloride, 4-vinylbenzene-15-crown ether-5, isopropanol, azodiisobutyronitrile and an ethylene boron anhydride pyridine complex; the yield and the purity of the 4, 4 '-bis (3-aminophenoxy) biphenyl can be remarkably improved, and the method is suitable for industrial production.

The invention relates to the technical field of catalyst treatment, in particular to a Raney nickel catalyst reduction and passivation treatment system and a passivation method.The system comprises a deactivation pool, a hydrogenation reactor and a circulation pipeline which are connected in a closed loop mode; a sodium nitrate solution supply end, a temperature adjusting system and a multi-dimensional sensing assembly (a concentration sensor, a temperature sensor, a pH sensor, a pressure sensor, a flow sensor and the like) are arranged, and the core is a processing unit integrating a control module and a dynamic soft measurement model. The desalted water injection amount, the sodium nitrate solution concentration and the deactivation solution temperature are preset and dynamically optimized through the treatment unit, closed-loop circulation of a reaction system is achieved through a circulation pipeline, and the passivation process is judged based on the pH value change. According to the method, the passivation rate and the completion time are predicted by means of the dynamic soft measurement model, the optimal process parameters are output in a self-adaptive mode, and the problems that a traditional passivation method depends on artificial experience, and is low in safety and insufficient in efficiency are solved by combining a safety interlocking mechanism and a uniform mixing regulation and control strategy.

The application provides a preparation method and product of 1,3-propanediol. The preparation method comprises the following steps: subjecting 3-hydroxypropionaldehyde aqueous solution to a first-stage hydrogenation reaction under the action of a first-stage hydrogenation catalyst to obtain a first-stage hydrogenation reaction product; and subjecting the first-stage hydrogenation reaction product to a second-stage reaction under the action of a second-stage hydrogenation catalyst to obtain a 1,3-propanediol product. The preparation method adopts two-stage hydrogenation, effectively improves the economy of the propenal hydration hydrogenation process, and solves the problems that the impurities generated in the 1,3-propanediol preparation route of the propenal hydration process are difficult to treat and resource utilization.

The application provides a method for carbon dioxide capture and hydrogenation synthesis of methanol based on a eutectic solvent, and belongs to the technical field of carbon capture and utilization. The method comprises the following steps: weighing acetyl guanidine and ethylene glycol according to a proportion, mixing the acetyl guanidine and the ethylene glycol, stirring to prepare a eutectic solvent at a given temperature, capturing carbon dioxide in flue gas by using the eutectic solvent to form a rich liquid, transferring the rich liquid into a high-pressure reaction kettle, adding a catalyst, filling in hydrogen, increasing the temperature to perform a carbon dioxide hydrogenation reaction, filtering to obtain a catalyst and a mixture of the eutectic solvent and methanol after the reaction, and performing flash evaporation on the mixture to obtain product methanol and regenerated eutectic solvent. After capturing carbon dioxide in the flue gas, the method directly performs in-situ carbon dioxide hydrogenation in the absorbent to prepare methanol, avoids problems such as high energy consumption of carbon dioxide desorption, high reaction temperature and low single-pass conversion rate in a traditional gas-solid phase reaction process, and has a simple process and easy regeneration of the eutectic solvent.

The invention relates to the technical field of organic synthesis, in particular to a synthesis method of N, N-dimethyl-1, 3-propane diamine. The synthesis method comprises the steps that N, N-dimethyl propionitrile and a modified Raney nickel-cobalt catalyst are mixed for a catalytic hydrogenation reaction, and the modified Raney nickel-cobalt catalyst is prepared from 0.1%-2.5% of chromium, 80%-85% of cobalt, 0.1%-2.5% of nickel and 7%-8% of aluminum. According to the synthesis method, caustic alkali or liquid ammonia does not need to be added, the raw material conversion rate is increased, the requirements of high-end products with ultra-purity (99.8%) and low moisture (less than or equal to 0.05%) can be met, and the impurity introduction risk is reduced.

Provided is a method for preparing a diol. In the method, a saccharide and hydrogen as raw materials are contacted with a catalyst in water to prepare the diol. The employed catalyst is a composite catalyst comprised of a main catalyst and a cocatalyst, wherein the main catalyst is a water-insoluble acid-resistant alloy; and the cocatalyst is a soluble tungstate and / or soluble tungsten compound. The method uses an acid-resistant, inexpensive and stable alloy needless of a support as a main catalyst, and can guarantee a high yield of the diol in the case where the production cost is relatively low.

The present invention provides a membrane electrode for hydrogen production by alkaline water electrolysis, a method for producing the same, and an electrolytic cell. The manufacturing method according to the present invention is a method of direct coating and hot pressing, which can obtain a membrane electrode in which the catalyst layer is uniform and firmly attached to the surface of the diaphragm, can be given good stability to the membrane electrode, and the obtained membrane electrode has a significantly reduced water electrolysis overpotential. The manufacturing method includes the step of directly coating a catalyst slurry on both sides of a diaphragm, drying it, hot pressing it, and then forming a catalyst layer on each side of the diaphragm to obtain the membrane electrode, wherein the diaphragm is selected from a porous diaphragm or an alkaline anion exchange membrane, the catalyst slurry contains a binder solution and a catalyst, the binder solution is one or more of a perfluorosulfonic acid resin solution and a perfluorosulfonic acid ionomer dispersion, the mass concentration of the binder solution is 5 to 30%, and the mass ratio of the binder solution to the catalyst is 1:1 to 4:1.

The invention discloses waste catalyst magnetic recovery equipment and a waste catalyst magnetic recovery method, and belongs to the technical field of catalyst recovery. The waste catalyst magnetic recovery equipment comprises a waste liquid bin, a collecting bin, a supporting and moving mechanism and a supporting frame; the magnetic adsorption mechanism comprises a driving motor, a rotating shaft, a mounting frame, an edge-changing adsorption auxiliary desorption assembly and a semi-adsorption magnetic rod assembly, and a non-return-scraping magnetic rod desorption mechanism and an all-directional washing mechanism are mounted on the inner wall of the collecting bin. Through the mode, the magnetic adsorption direction of the semi-adsorption magnetic rod assembly is changed by the side-changing adsorption auxiliary desorption assembly, so that the adsorption force of the semi-adsorption magnetic rod assembly to attachments is effectively reduced, and the bottom ends of the back-scraping-free magnetic rod desorption mechanism and the semi-adsorption magnetic rod assembly are washed through the all-directional washing mechanism; residual attachments are washed into the collecting bin, so that the waste catalyst recycled from the waste water flows out of the discharging hopper, and the waste catalyst can be conveniently barreled and collected.

This invention provides a method for manufacturing electrode materials that have excellent water electrolysis performance in water electrolysis devices. [Solution] A method for manufacturing an electrode material used in the electrodes of a water electrolysis device includes a step of obtaining Raney nickel contained in the electrode material, and the step of obtaining Raney nickel includes an alkali treatment step of dissolving aluminum from the NiAl alloy with an alkaline substance. The component composition of the NiAl alloy, excluding unavoidable impurities, is the composition formula Al3Ni (2-x) Cu x (x is 0)

The invention discloses a preparation method of 2-pyrrolidone, and belongs to the technical field of fine chemical engineering and catalysis. According to the method, maleimide is taken as a raw material, and 2-pyrrolidone is prepared by hydrogenation reaction under mild conditions in a 1, 4-dioxane solvent by utilizing the synergistic effect of a main catalyst Raney nickel and a cocatalyst rare earth Lewis compound; the mass ratio of 1, 4-dioxane to maleimide is (10: 1)-(2: 1), the mass ratio of maleimide to a Raney nickel catalyst is (1000: 1)-(100: 1), the molar ratio of maleimide to a rare earth Lewis compound is 1: 1, the hydrogen pressure is 2-4MPa, the reaction temperature is 140-180 DEG C, reacting for 16-24 hours, filtering and recovering Raney nickel after the reaction, and carrying out reduced pressure distillation to separate a solvent and a product, and the rare earth compound is recycled after being purified. According to the method, selective hydrogenation is achieved through the synergistic effect of the composite catalyst, the product yield reaches 95.3%-99.5%, the purity is larger than or equal to 99.2%, compared with a traditional method, the condition is mild, use of precious metal catalysts is avoided, the catalyst and the solvent can be recycled, and the production cost and pollution are reduced.

The invention relates to a method for preparing 1, 4-butanediol. The method can include reacting a solution comprising 1, 4-butynediol with hydrogen in the presence of an effective amount of a catalyst. The catalyst may comprise copper.

This disclosure pertains to the preparation of bifunctional compounds (e.g., Compound 1), intermediates in the preparation of such compounds, and preparation of such intermediates.

The present invention relates to a process for the preparation of hexamethylenediamine by hydrogenation of adiponitrile in the presence of a Raney nickel catalyst and a basic co-catalyst containing potassium hydroxide, wherein the basic co-catalyst contains a further basic compound selected from the group consisting of alkaline hydroxides, alkaline earth hydroxides and ammonium hydroxides.

The present invention relates to an electrode for the reduction of carbon dioxide CO2, for example, to carbon monoxide CO and / or syngas CO / H2, the electrode containing cadmium chalcogenide and / or zinc chalcogenide nanoparticles as a catalyst, an electrochemical process for the reduction of carbon dioxide CO2, for example, to carbon monoxide CO and / or syngas CO / H2 using an electrode containing cadmium chalcogenide and / or zinc chalcogenide nanoparticles, and the use of cadmium chalcogenide and / or zinc chalcogenide nanoparticles as catalysts in an electrode for the electrochemical reduction of a reduced species, such as carbon dioxide CO2, to carbon monoxide CO and / or syngas CO / H2.

The invention provides a catalyst, a preparation method and application thereof. The catalyst comprises a porous matrix and an auxiliary agent arranged on at least part of the surface of the porous matrix, the porous matrix comprises a Raney cobalt material, and the auxiliary agent comprises metal rhenium, alkali metal and alkaline earth metal; wherein the Raney cobalt material comprises a Co-S chemical bond. The catalyst provided by the invention has excellent activity, and can effectively improve the conversion rate of dinitrile compounds and the selectivity of diamine.

The invention discloses a preparation method of a multi-component metal framework catalyst, and belongs to the field of catalytic materials. The preparation method comprises the following steps that S1, metal elementary substance particles including aluminum elementary substances are mixed in proportion, and then uniform molten metal is formed through induction melting; s2, discharging the melt through a limiting hole, and atomizing and cooling by using a high-pressure water and silicone oil mixed coolant to obtain micron-sized spheroidic alloy or intermetallic compound particles; and S3, carrying out acid and alkali treatment on the alloy or intermetallic compound particles, removing a surface oxide layer and activating a pore structure to prepare the metal framework catalyst. The multi-component metal framework catalyst has excellent mechanical strength and wear resistance. The unique sphere-like morphology and the metal skeleton structure can effectively reduce particle wear in the reaction process, significantly prolong the service life of the catalyst, and are suitable for industrial continuous production.

The present invention provides a method for synthesizing 7-ketolithocholic acid or its intermediates produced from a novel intermediate I-1. In the method, bisnoralcohol, a decomposition product of phytosterol, is used as a starting material, and 7-ketolithocholic acid or its intermediates can be obtained through oxidation, Knoevenagel reaction (or Wittig reaction), hydrogenation, esterification, ketal protection, allylic oxidation, ketal deprotection, and hydrogenation. The method of the present invention allows easy availability of raw materials, high yields, simple and mild reaction conditions, and is suitable for industrial production.

The invention relates to a process for preparing a mixture containing cyclohexanol and cyclohexanone, comprising the step of hydrogenating cyclohexylhydroperoxide in cyclohexane in the presence of a Raney nickel catalyst to obtain cyclohexanol and cyclohexanone.

The application discloses a preparation method of hexamethylene diamine, which comprises the following steps: 1) catalyst pretreatment: mixing a hydrogenation catalyst and a modifier, and treating under a nitrogen atmosphere for 0.5-2h to obtain a modified catalyst; and 2) hydrogenation reaction: hydrogenating adiponitrile into hexamethylene diamine in the presence of the modified catalyst. The hexamethylene diamine prepared by the method has the advantages of good catalyst stability, high product yield and low DCH generation amount, and the problem of frequent shutdown of a device can be avoided due to the non-introduction of inorganic alkali.

This method for producing an electrode material used for an electrode of a water electrolysis device includes a step for obtaining Raney nickel contained in the electrode material. The step for obtaining Raney nickel includes an alkali treatment step for eluting aluminum from a NiAl alloy using an alkali substance. The component composition of the NiAl alloy, excluding inevitable impurities, is represented by the compositional formula Al3.00Ni(2.00 − (x + y))CuxFey (x and y are values satisfying 0.00 < x + y ≤ 0.45, 0.00 < x ≤ 0.40, and 0.00 < y ≤ 0.30).

The present application relates to a kind of catalyst and its preparation method and application, belong to catalytic field.The catalyst includes metal-based active component and surface metal oxide active component;The metal-based active component includes at least one of nickel-based catalyst or cobalt-based catalyst;The surface metal oxide active component includes at least one of tungsten oxide or molybdenum oxide deposited on the surface of metal-based active component.The catalyst can be used for the preparation of multistage amine, and its operation is simple.The catalyst has high activity, high safety, high selectivity and good stability for reduction amination reaction, can be repeatedly used, is conducive to improving the quality and quality stability of product, reduces process cost, modification cost is low, is conducive to large-scale production.

The invention relates to a method for producing a metal-foam body, comprising the steps of (a) providing a metal-foam body A, which consists of nickel, cobalt, copper, or alloys or combinations thereof, (b) applying an aluminum-containing material MP to metal-foam body A so as to obtain metal-foam body AX, (c) thermally treating of metal-foam body AX, with the exclusion of oxygen, to achieve the formation of an alloy between the metallic components of metal-foam body A and the aluminum-containing material MP so as to obtain metal-foam body B, wherein the duration of the thermal treatment is chosen in dependence on the temperature of the thermal treatment and the temperature of the thermal treatment is chosen in dependence on the thickness of the metal-foam body AX. The invention also relates to the metal-foam bodies obtainable by the methods according to the invention and to the use thereof as catalysts for chemical transformations.

This method for producing an electrode material used for an electrode of a water electrolysis device includes a step for obtaining Raney nickel contained in the electrode material. The step for obtaining Raney nickel includes an alkali treatment step for eluting aluminum from a NiAl alloy using an alkali substance. The component composition of the NiAl alloy, excluding inevitable impurities, is represented by the compositional formula Al3.00Ni(2.00 − x)Cux (x is a value satisfying 0.00 < x < 0.30).

This invention discloses a method for preparing m-phenylenediamine, relating to the field of fine chemical hydrogenation synthesis technology. The method involves preparing a homogeneous feed solution by mixing pretreated isophthalonitrile and anhydrous methanol. A modified Raney Ni catalyst is added to the homogeneous feed solution for low-pressure hydrogenation. The modified Raney Ni catalyst is then separated from the homogeneous feed solution after the low-pressure hydrogenation reaction to obtain a crude m-phenylenediamine solution. The crude m-phenylenediamine solution is then purified by distillation after removing methanol to obtain m-phenylenediamine. The entire process is continuous, and the obtained m-phenylenediamine yield is ≥98.5%, purity is ≥99.5%, and moisture content is ≤0.1%. The modified Raney Ni catalyst is a Mo-Co dual-auxiliary modified Raney Ni catalyst, which can be reused to reduce costs.

This invention relates to the field of catalytic hydrogenation, and more particularly to the semi-hydrogenation of allenes to corresponding alkenes in the presence of heterogeneous catalysts.

An improved process for producing low-impurity 1,3-butylene glycol includes: (a) aldolizing acetaldehyde in a reactor to produce acetaldol; (b) hydrogenating the acetaldol in a hydrogenation reactor in the presence of a hydrogenation / dehydrogenation catalyst to produce a crude 1,3-butylene glycol stream containing an active hydrogenation / dehydrogenation catalyst; (c) removing or deactivating catalyst in the crude 1,3-butylene glycol stream; and (d) distilling the treated crude 1,3-butylene glycol stream in a distillation train to provide a purified 1,3-butylene glycol product.