55 results about "Decarbonylation" patented technology

The present invention belongs to the technical field of furan synthesis, and specifically relates to a catalyst for furan synthesis by decarbonylation of furfural, and a preparation method and application thereof. The catalyst comprises a carrier and an active component loaded on the carrier, and the active component comprises a main active component and an auxiliary active component; the main active component is located in the outer layer of the carrier, and the main active component is metal palladium; the auxiliary active component is embedded in the carrier, and the auxiliary active component is an alkali metal oxide. The preparation method of the catalyst not only reduces the loading amount of Pd, and its special structure solves the problem that the raw material furfural is easy to coke and causes the catalyst to deactivate quickly, but also improves the activity, selectivity and stability of the catalyst.

The invention belongs to the technical field of coal ethylene glycol, and particularly relates to a process and a device for finely removing impurities from carbon monoxide after cryogenic separation of synthesis gas, the device comprises an impurity removal device, the impurity removal device comprises a desulfurization tank, a dechlorination tank and a decarbonylation tank which are sequentially connected in series, or an adsorption tower which is sequentially filled with desulfurization, dechlorination and decarbonylation adsorbents; the impurity removal device is arranged to remove trace hydrogen sulfide, hydrogen chloride, carbonyl iron and carbonyl nickel in CO after cryogenic separation, so that ppb-level removal of impurities in CO is realized, poisoning of a downstream dimethyl oxalate (DMO) synthesis catalyst is avoided, the service life of the catalyst is prolonged, the production cost of an enterprise is reduced, and the operation stability of the device is improved.

The utility model relates to the field of liquid filling devices, and discloses a novel decarbonylation metal cleaning agent filling structure which comprises a supporting frame and a material storage barrel, the top of the material storage barrel is connected with a material bin cover in a clamped mode, and throttling pipes are fixedly connected to the left side and the right side of the center of the bottom end of the material storage barrel. Grabbing hooks are fixedly connected to the planes of the front end and the rear end of the bottom of the storage barrel, a conveying mechanism is arranged at the grabbing hooks at the bottom of the storage barrel and used for conveying a purifying agent to a designated position, and a conveying mechanism is arranged at the top of the front end of the supporting frame and used for conveying the purifying agent to the designated position; the conveying mechanism is used for conveying the workpieces needing to be filled to a designated place. According to the filling device, the stirring gear lever driven by the motor is matched with the adjustable auxiliary wheel to work, so that the filling precision is improved, and meanwhile, the filling device is convenient and rapid to clean due to the detachable material conveying box and the material bin cover.

The preparation method of the catalyst taking Al2O3-TiO2 composite oxide as the carrier and the application of the catalyst in the furan preparation reaction through furfural gas-phase decarbonylation comprise the following steps that furfural and hydrogen are mixed and pumped into a fixed bed reactor filled with the catalyst, and furfural is subjected to decarbonylation reaction on the catalyst to generate furan. According to the catalyst, Al2O3-TiO2 composite oxide is used as a carrier, the loading capacity of active component precious metal Pd and Pt is 0.15-0.3%, and the loading capacity of auxiliary component potassium and sodium is 1.0-20%. The catalyst has the advantages of low noble metal loading capacity, high activity, high product selectivity, long service life and the like. The reaction for preparing furan through furfural decarbonylation is carried out under normal pressure, the furfural conversion rate is greater than 95%, the furan selectivity is greater than 99%, the single-pass life of the catalyst exceeds 1000 hours, and the regeneration life can still exceed 800 hours. The method is characterized in that TiO2 is doped into a carrier, and precious metal nanoparticles are wrapped, so that the sintering resistance of the catalyst can be effectively improved, and the stability of the catalyst is improved.

The invention provides a method and system for preparing dimethyl carbonate through dimethyl oxalate decarbonylation, and the method comprises the following steps: dimethyl oxalate is subjected to decarbonylation reaction in a reactor, and a gas phase product and a first liquid phase product are respectively obtained from the decarbonylation reactor: the first liquid phase product enters a dimethyl carbonate product tower; cooling the gas-phase product, carrying out gas-liquid separation to obtain a gas-phase material and a second liquid-phase product, and feeding the gas-phase material and the second liquid-phase product into the carbonate product tower; absorbing by-products containing carbon dioxide and dimethyl ether by the gas-phase material through dimethyl carbonate, and desorbing and removing by-products containing carbon dioxide and dimethyl ether by the discharged liquid-phase absorption material in a desorption tower. According to the method, a separate discharging mode is adopted, condensate of a liquid-phase product and condensate of a gas-phase product are treated at the same time through the dimethyl carbonate product tower, the process is simple, and energy consumption is low; dimethyl carbonate is adopted as an absorbent, carbon dioxide and dimethyl ether in carbon monoxide product gas can be effectively separated, the process is simple, and energy consumption is low.

The present application relates to furan preparation technical field, specifically to a kind of furfural decarbonylation catalyst, preparation method and utilize the catalyst preparation furan process.The catalyst includes carrier and active component supported on it, with the mass of the carrier, Pt 0.2%‑0.6%, Co 4%‑8%, Al2O3 74%‑85%, ZrO2 11%‑16%, CeO2 4%‑13%.The present application adopts structural aid ZrO2 and CeO2 to modify Al2O3 carrier, obtains acid moderate composite oxide carrier, can avoid the influence of furfural polymerization and the activity and stability of catalyst;Using Co as auxiliary active component, under the premise of reducing the dosage of main active component Pt, ensure catalytic effect, not only reduce the cost of catalyst, more importantly, it can improve the conversion rate of furfural and furan selectivity in furfural decarbonylation reaction, ensure high furan yield.

The invention relates to a method for generating dimethyl carbonate by decarbonylation of dimethyl oxalate, which comprises the following steps: dissolving dimethyl oxalate in a solvent to prepare a solution, adding a catalyst, and carrying out decarbonylation reaction to obtain dimethyl carbonate, the catalyst comprises a main catalyst and a cocatalyst, the main catalyst is alkoxide of alkali metal, and the cocatalyst is one or more of pyridine, acetone or triethylamine. According to the method, an alkoxide decarbonylation catalyst system of a single alkali metal is changed into a multi-element catalyst system by adding the auxiliary agent, so that the liquid-phase decarbonylation reaction can be carried out at low temperature and low pressure, the reaction condition is milder, the equipment cost and energy consumption of the reaction are reduced, and the catalyst can be recycled for multiple times and has good economic benefits.

The invention belongs to the technical field of organic synthetic chemistry, and discloses a preparation method of an aromatic ketone compound, which comprises the following steps: by taking an unsaturated carbonyl compound obtained by condensing aryl acetaldehyde / acid and aldehyde / ketone molecules as a precursor, carrying out a reaction on the unsaturated carbonyl compound in the presence of a free radical precursor and molecular oxygen under the conditions of illumination and / or heating to obtain the aromatic ketone compound. And carrying out free radical mediated decarbonylation functionalization reaction in an organic solvent to obtain the aromatic ketone compound. The functional group contained in the free radical precursor is introduced to the alpha position of the ketone compound. By improving reaction participants and a reaction mechanism, the aromatic ketone compounds with various structures can be efficiently and highly selectively constructed in one step, the functionalization of the alpha position of the aromatic ketone compounds is synchronously realized, and the preparation method which is simple and convenient to operate, high in atom economy, green and environment-friendly is provided for the aromatic ketone compounds; the obtained compound is especially applicable to the fields of drug synthesis and synthesis of other materials.

A method for producing a cyclic olefin compound, which comprises a decarbonylation and decarboxylation step for obtaining a cyclic olefin compound by decarbonylation and decarboxylation of an alicyclic dicarboxylic acid anhydride in the presence of a nickel complex represented by formula (1) and a metal-based cocatalyst, the metal-based co-catalyst contains one or more elements selected from the group consisting of elemental metals and metal compounds. Ni (Y) m (L) n (1) In formula (1), Ni is 0-valent or 2-valent nickel, Y is an anionic monodentate or polydentate ligand and has at least one Ni-E covalent bond, E is a heteroatom or a pi-bondable group, m is a real number of 0-2, L is a neutral ligand, and n is a real number of 0-6.

The invention discloses a preparation method of a chiral intermediate (S)-3-methyl-1-tert-butoxycarbonyl-1,4-diazepane for treating ocular hypertension, relating to the technical field of pharmaceutical chemicals. The invention comprises the following steps: using 1-benzyl-3-methylpiperidin-4-one as a starting raw material, performing chiral resolution to obtain an intermediate 1, performing an addition-elimination reaction on the intermediate 1 and hydroxylamine hydrochloride to obtain an intermediate 2, performing a Beckmann rearrangement reaction on the intermediate 2 to obtain an intermediate 3, performing an amino deprotection reaction on the intermediate 3 to obtain an intermediate 4, performing an amino protection reaction on the intermediate 4 and di-tert-butyl dicarbonate to obtain an intermediate 5, and performing a decarbonylation reaction on the intermediate 5 to obtain the (S)-3-methyl-1-tert-butoxycarbonyl-1,4-diazepane. The preparation method has the characteristics of readily available raw materials, a simple process and a high product yield, and is suitable for the industrial production of the (S)-3-methyl-1-tert-butoxycarbonyl-1,4-diazepane.

This invention proposes a heterogeneous catalyst and its application in the decarbonylation of alkyl oxalate to alkyl carbonate. The heterogeneous catalyst is a transition metal-modified organic amine-grafted polystyrene resin obtained by grafting chloromethylated polystyrene resin with an organic tertiary amine, followed by modification with a transition metal anion complex. This invention utilizes the heterogeneous catalyst to fully utilize dimethyl oxalate, an important intermediate in the coal-to-ethylene glycol process. By decarbonylating dimethyl oxalate, it can be efficiently converted to dimethyl carbonate and its derived alkyl esters under mild conditions.

The invention provides a method for continuously producing dimethyl carbonate, which comprises the following steps: 1) washing a carbonylation reaction gas-phase mixture with methanol, and separating to obtain a first gas-phase mixture and a first liquid-phase mixture; 2) carrying out flash evaporation and light component removal on the first liquid-phase mixture to obtain a gas-phase mixture containing methyl nitrite and a second liquid-phase mixture; 3) vaporizing the second liquid-phase mixture to obtain a second gas-phase mixture; and 4) carrying out a decarbonylation catalytic reaction on the second gas-phase mixture to obtain a gas-liquid mixture, carrying out gas-liquid separation on the gas-liquid mixture to obtain a gas-phase product and a liquid-phase product, and rectifying the liquid-phase product to provide a dimethyl carbonate product. The invention further provides a system for continuously producing dimethyl carbonate. According to the method and the system for continuously producing the dimethyl carbonate, provided by the invention, MN can be effectively removed, so that a catalytic reaction for preparing DMC by decarbonylation taking DMO as a raw material is smoothly carried out, and continuous and stable production of the DMC is realized.

The present disclosure describes a process for producing a renewable aviation fuel component wherein the process comprises providing a renewable feedstock and subjecting the feedstock to a decarboxylation and / or decarbonylation (DCO) reaction (20) in a DCO zone, thereby obtaining a DCO effluent (21); subjecting at least a portion of the DCO effluent to a hydrotreating (HT) reaction (30) in the HT zone to obtain a hydrotreated effluent (31); subjecting the hydrotreated effluent to gas-liquid separation (40) to obtain a degassed hydrotreated effluent (41); subjecting at least a portion of the degassed hydrotreated effluent to hydroisomerization (H-ISO) (50), thereby obtaining a hydroisomerized effluent (51); and subjecting at least a portion of the hydroisomerized effluent (51) to fractionation (60) and recovering at least renewable aviation fuel components.

The invention relates to a method for decarbonylation alkynylation of ketone, which comprises the following step: in an inert solvent, under the action of a metal catalyst and a ligand, carrying out decarbonylation-reduction coupling reaction on a ketone compound and alkynyl chloride to obtain an alkyne compound. The alkyne is synthesized under the strategy of nickel catalysis, and the method has the advantages of easily available raw materials, simple operation and mild conditions, has very good theoretical guidance significance and practical application value, and conforms to the sustainable green chemistry concept.

This invention relates to the field of gaseous decarbonylation of iron and nickel, specifically to a gaseous decarbonylation protective agent, its preparation method, application, and a method for removing decarbonylation of iron and nickel from methanol synthesis gas. The protective agent comprises an active component, a support, and an auxiliary agent. The active component comprises elemental copper and elemental zinc, and the support comprises kaolin. In this system, the active component is distributed between the kaolin support and adheres to the support. The copper-zinc active system protective agent exhibits good activity and a higher decarbonylation capacity, better protecting the long-term operation of the methanol synthesis catalyst. Kaolin has a large specific surface area and numerous micropores, enabling it to fully physically adsorb carbonylation of iron and nickel, which then catalytically dissociates and deposits afterward at the copper-zinc active centers.

The invention discloses a kind of ethyl benzoate and its preparation method, belong to the field of fine chemical preparation. The preparation method of ethyl benzoate is, in the first step, acrolein and ethyl malonate are subjected to Kneuwengel condensation reaction to generate enester under triethylenediamine catalyst; In the second step, the diene ester and acrolein generated by the first step undergo Diels-Alder reaction to obtain cyclohexene carboxylate substituted with aldehyde group; In the third step, the cyclohexene carboxylate substituted with aldehyde group is subjected to decarbonylation and dehydrogenation reaction to generate ethyl benzoate under metal catalyst. The reaction conditions of the present invention are simple, the catalyst is simple and easy to obtain, and the cost is low. It is a method for synthesizing spices and flavors through a biomass route with great industrialization prospects.

The invention belongs to the technical field of 2-acetylfuran preparation, and discloses a continuous flow synthesis method of 2-acetylfuran, which comprises the following steps: continuously preparing furan by using a furfural decarbonylation method; continuously-flowing acetic anhydride is adopted to absorb continuously-prepared furan, and continuously-flowing raw material mixed liquid is obtained; an acetic anhydride solution of a catalyst is introduced into the continuously flowing raw material mixed solution, a continuously flowing reaction mixed solution is obtained, and the molar ratio of furan to acetic anhydride to the catalyst is 1: (1.05-1.3): (0.05-0.2); the reaction mixed solution is heated to 80-140 DEG C in a continuous flow reactor for a reaction, the reaction pressure is 0.2-0.8 MPa, and 2-acetylfuran is continuously synthesized. No solvent participates in the reaction, continuous post-treatment can be carried out, continuous automatic production is realized, the reaction is completed within a short reaction retention time, the generation of furan ring-opening impurities is greatly reduced, and the reaction selectivity and yield are effectively improved.

The invention relates to a preparation method of a catalyst taking fibrous activated aluminum oxide as a carrier and application of the catalyst in a reaction for preparing furan through furfural gas-phase decarbonylation, which comprises the following steps: mixing furfural and hydrogen, pumping the mixture into a fixed bed reactor filled with the catalyst, and carrying out decarbonylation reaction on furfural on the catalyst to generate furan. According to the catalyst, fibrous active aluminum oxide is used as a carrier, the loading capacity of active component precious metal Pd and Pt is 0.15-0.3%, and the loading capacity of auxiliary component potassium and sodium is 1.0-20%. The method is characterized in that fibrous activated aluminum oxide is used as a carrier, the prepared catalyst is small in main active component particle size, narrow in distribution and good in dispersity, the average particle size of the particles is smaller than 4 nm, and when the catalyst is applied to the reaction for preparing furan through furfural decarbonylation, the higher furfural conversion rate and the higher furan selectivity and stability are achieved; the catalyst is simple in preparation method, mild in operation condition and easy to produce.

The present invention relates to a catalyst for decarbonylation reaction, a preparation method thereof and a use thereof, which are used for preparing dialkyl carbonate by decarbonylating dialkyl oxalate. The catalyst contains two or more of alkali metals, alkaline earth metals and phosphorus, wherein the carrier is a nitrogen-modified carbon-based material.

The present invention discloses a catalyst for the coupling reaction of decarbonylation and carbonylation, its preparation method and application. The catalyst includes a carrier, palladium and phosphate. The preparation method of the catalyst includes: (1) loading a palladium precursor onto the carrier by an impregnation method, drying and reducing to obtain a catalyst intermediate; (2) impregnating the catalyst intermediate obtained in step (1) into an impregnating solution containing phosphate, and drying and calcining under an inert atmosphere to obtain the catalyst. The catalyst of the present invention is a new bifunctional catalyst, which can effectively promote the coupling reaction of decarbonylation and carbonylation, realize the self-production and self-use of CO, improve the atom utilization rate, and can enhance the bifunctional catalytic activity, increase the production of dimethyl carbonate and methyl 3-pentenoate, and extend the service life of the catalyst and save costs when used in the coupling reaction of preparing dimethyl carbonate from dimethyl oxalate and preparing methyl 3-pentenoate from 1,3-butadiene.

The invention relates to a method for synergistically catalyzing a decarbonylation alkylation reaction of alkyl aldehyde through nickel electrochemistry, which comprises the following steps: in an inert solvent, under the action of a metal catalyst, a ligand, an electrode and an electrolyte, carrying out catalytic reaction on an aldehyde compound containing unsaturated alkyl and alkyl bromide to obtain an alkane compound. According to the present invention, the non-activated alkyl aldehyde is adopted as the alkylation reagent, the raw materials are easily available, the operation is simple, the condition is mild, the expensive active metal catalyst or additive is not required to participate in the reaction, the good atom economy is provided, the high value-added alkane compound is obtained under the cheap and easily available current condition, and the synthesis process is environmentally friendly.

The invention provides a preparation method of a melamine grafted chloromethylated bead-based decarbonylation catalyst and alkyl carbonate, and the melamine grafted chloromethylated bead-based decarbonylation catalyst is obtained by carrying out nucleophilic substitution on chloromethylated beads and polyamine to obtain aminated chloromethylated beads, and then carrying out Schiff base condensation on the aminated chloromethylated beads and an aldehyde-terminated melamine-dialdehyde prepolymer to obtain the melamine grafted chloromethylated bead-based decarbonylation catalyst. According to the invention, the melamine with strong coordination ability and chemical stability is chemically grafted to the surface of the chloromethylated resin to construct the multiphase decarbonylation catalyst with stable structure and excellent performance, and the multiphase decarbonylation catalyst shows excellent catalytic activity, selectivity and stability in the decarbonylation reaction of alkyl oxalate; the alkyl oxalate can be efficiently converted into the alkyl carbonate under a mild condition, and a new technical scheme is provided for solving the problems of high-value utilization of the coal-to-ethylene glycol intermediate and green synthesis of the alkyl carbonate.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a preparation method of an alkaline molecular sieve catalyst, and the catalyst is used for synthesizing dimethyl carbonate through decarbonylation of dimethyl oxalate. The catalyst is an alkali metal salt loaded by a molecular sieve carrier, and the molecular sieve carrier comprises one or a combination of more of FAU, MOR, BEA, FER, LTL, MFI, beta, ZSM-5 and silicalite-1. The catalyst can be used for efficient and green decarbonylation synthesis of dimethyl carbonate under the conditions that the reaction temperature is 100-350 DEG C, the reaction pressure is 0.1-7.0 MPa and the reaction time is 10-500 minutes. The catalyst has the dimethyl oxalate (DMO) conversion rate of 90% or above and the dimethyl carbonate (DMC) selectivity of 90% or above, shows excellent stability and has a certain industrial application prospect.

The application belongs to the field of chemical catalysis, and particularly relates to a catalyst for catalyzing continuous decarbonylation hydrogenation reaction and a preparation method and application thereof. The catalyst is Ni-M / SNTs@MgO, which comprises active metal Ni, auxiliary metal M, carrier SNTs and surface-coated MgO, the auxiliary metal M is one or more of Cu, Co, Zn, Zr and Mo, and the carrier SNTs is a silicon dioxide nanotube; and the preparation method comprises surface-coating MgO on Ni-M / SNTs by using an atomic layer deposition method. The catalyst has low cost, excellent catalytic performance when used for preparing tetrahydrofuran by continuous decarbonylation hydrogenation of furfural, furfural conversion rate is greater than 99%, and tetrahydrofuran selectivity is greater than 90%. The catalyst has no obvious deactivation sign when continuously operated for more than 3000 hours, and has a good industrial application prospect.

The invention relates to a method for producing carbon monoxide by decarbonylation of a compound A, B or C, wherein compound A has the structural formula: R5-C6(R1-4)-[N(CHO)-C6(R1-4')] n -R5', compound B has the structural formula: R5-[C6(R1-4)-N(CHO)-C6(R1-4')] n -R5', and compound C has the structural formula: R5-[C6(R1-4)-N(CHO)-C6(R1- 4')-X] n -R5', wherein R1, R2, R3, R4, R1', R2', R3' and R4' independently of one another are H, D, F, an alkyl group or an aryl group, wherein X is an aliphatic bridge, is an aromatic bridge, has an ether group, has an ester group, has an amide group or has a urethane group, and n is in a range from 1 to 100,000. The invention also relates to a method for producing a synthetic fuel, in which method the carbon monoxide is reduced using hydrogen.

A process for producing sustainable aviation fuel (SAF) or components thereto is described, wherein the integrated process comprises in the first arm providing a renewable feedstock comprising triglycerides, hydrolyzing the triglycerides into free fatty acids which are subjected to a decarboxylation and / or decarbonylation (DCO) reactions to produce hydrocarbon intermediate A. As second arm of the integrated process, any carbon oxides and glycerol released in the first arm are refined into further hydrocarbons, hydrocarbon intermediate B, which together with hydrocarbon intermediate A are isomerized and a sustainable aviation fuel or components thereto are provided. The process increases carbon efficiency and yield in sustainable aviation fuel production.

A process for producing a renewable aviation fuel component is described, wherein the process comprises providing a renewable feedstock and subjecting the feedstock to a decarboxylation and / or decarbonylation (DCO) reaction (20) in a DCO zone, thereby obtaining a DCO effluent (21); subjecting at least a portion of the DCO effluent to a hydrotreatment (HT) reaction (30) in a HIT zone, to obtain a hydrotreated effluent (31); subjecting the hydrotreated effluent to a gas-liquid separation (40) to obtain a degassed hydrotreated effluent (41); subjecting at least a portion of the degassed hydrotreated effluent to hydroisomerisation (H-ISO) (50), thereby obtaining a hydroisomerised effluent (51); and subjecting at least a portion of the hydroisomerised effluent (51) to a fractionation (60), and recovering at least the renewable aviation fuel component

The invention relates to the technical field of chemical engineering, in particular to a dimethyl oxalate decarbonylation catalyst and a preparation method and application thereof. A catalyst comprising a carrier; the active component is loaded on the carrier; the active component is one or more of Co, Ni and Pd; the loading capacity of the active component is 0.1%-5%. The preparation method of the catalyst comprises the following steps: S1, pretreating the carrier; s2, dipping the pretreated carrier in a transition metal salt solution, and after dipping, obtaining a first precursor loading body; s3, slowly drying the first precursor loading body, heating and continuously drying to obtain a second precursor loading body; the transition metal salt is one or more of nickel nitrate, palladium chloride and cobalt nitrate; and S4, under the protection of nitrogen, carrying out high-temperature roasting on the second precursor carrier to obtain the catalyst. The catalyst can be used for catalyzing decarbonylation reaction of dimethyl oxalate to prepare dimethyl carbonate, the conversion rate of dimethyl oxalate can reach 95% or above, the highest conversion rate can reach 100%, and the yield of dimethyl carbonate exceeds 90%.

The application discloses a catalyst for co-production of dimethyl carbonate and monomethyl malonate, and a preparation method and application thereof. The catalyst comprises rhodium nanoparticles and grafted ionic liquid coupling agents. When the catalyst is used in a coupling reaction of dimethyl oxalate decarbonylation for preparing dimethyl carbonate and methyl glycolate carbonylation for preparing monomethyl malonate, the modified rhodium nanoparticles can be uniformly dispersed in liquid-phase reaction raw materials, quasi-homogeneous catalysis is realized, CO generated by decarbonylation can be supplied to the carbonylation reaction, atomic utilization is improved, in-situ generated CO can reduce the activation energy required by the carbonylation reaction, the reaction temperature is lower, the selectivity is higher, and the catalytic life of the decarbonylation reaction is prolonged.