119 results about "Oxidative carbonylation" patented technology

The present invention relates to double-component carried catalyst PdCl2-Cu(OAc)2/zeolite for synthesizing diphenyl carbonate and its preparation. The catalyst consists of zeolite in 50-100 weight portions, PdCl2 in 0.1-10 weight portions and Cu(OAc)2 in 0.1-30 weight protions. It is prepared through equi-volume soaking and roasting at 250-750 deg.c. The catalyst system has also metal acetate as inorganic oxidation-reduction assistant, hydroquinone as organic oxidation-reduction assistant, and tetrabutyl ammonium bride as surfactant. The catalyst has very high catalytic activity and excellent selectivity to liquid phenol in synthesizing diphenyl carbonate. The catalyst is easy to separate from product, easy to recover and regenerate and has simple preparation process.

The invention discloses a copper-based catalyst prepared by an ammonia distillation method and an application of the copper-based catalyst in a reaction system for oxidation carbonylation synthesis of alkyl carbonate. The use of a chlorine-containing compound is completely avoided in the preparation process of the catalyst, so that the problems of equipment corrosion and deactivation caused by chlorine loss are completely solved; and the catalyst prepared by the ammonia distillation method is high in selectivity, long in service life, low in preparation cost and relatively simple in process.

A nano-class organic/inorganic mesoporous hybridizing catalyst for preparing dimethyl carbonate by liquid-phase oxidization and carbonylation of methanol contains copper halides and the carrier whichis a nano-class organic/inorganic mesoporous hybridizing material with specially treated surface for effectively dispersing the copper halides on it. The said dimethyl carbonate is prepared from methanol, catalyst, CO and O2 through reaction at 110-140 deg.C and 2.0-5.0 MPa. Its advantages are high selectivity, activity and stability, low corrosion and cyclic use of catalyst.

The invention discloses a catalyst for synthesizing dimethyl carbonate by methanol liquid-phase oxidative carbonylation and methods. The catalyst comprises a copper halide and an ionic liquid; the mass ratio of the copper halide to the ionic liquid is 1:(1-10); a cation of the ionic liquid is an imidazole cation, a quaternary ammonium salt cation or a pyridine cation; and an anion of the ionic liquid is a halogen ion. The catalyst disclosed by the invention has relatively high methanol conversion ratio and high dimethyl carbonate selectivity and has an industrial application prospect. In addition, due to the addition of the ionic liquid, corrosion to stainless steel reaction equipment can be relieved.

The invention relates to a process for preparing a dimethyl carbonate catalyst by liquid-phase oxidation carbonylation of methanol. The process comprises the following steps: respectively dispersing or dissolving cuprous halide and one or more of nitrogenous heterocyclic compounds and nitrogen-containing polymers in an organic solvent; adding a solution/suspension into another solution/suspension at a certain temperature and stirring speed, continuously stirring for a certain period to form a coordination complex; transferring the suspension into a vacuum drier, removing the organic solvent at a certain temperature and vacuum degree to obtain a solid powdered catalyst, and grinding the catalyst to 100-200 meshes; and adding a dry powder catalyst, methanol, CO and O2 into a batch reactor, and synthesizing dimethyl carbonate at a temperature of 90-130 DEG C and pressure of 2.0-3.0MPa, wherein the per-pass conversion is more than or equal to 30 percent, and the selectivity of the target product dimethyl carbonate is more than or equal to 99.9 percent. The catalyst is simple in preparation process, cannot be easily caked, and has good activity, selectivity and stability.

The present invention relates to a catalyst for synthesizing diphenyl carbonate by utilizing heterogeneous oxidation carbonylation and preparation method of said catalyst. Said preparation method includes the following steps: making palladium salt be loaded on the manganese series composite metal oxide carrier, said manganese series composite metal oxide carrier is formed from manganese oxygen compound and metal oxide of any one kind or more than one kind of La, Ce, Ti, Zr, V, Cr, Mo, W, Fe, Co, Ni, Cu, Ag, Zn, Bi, Pb and Sn, the loaded quantity of active component Pd is 0.01wt%-10wt%, utilizing impregnating process, precipitation process or mixed fuel burning process to make the active component palladium salt be loaded on the manganese series composite metal oxide carrier, drying and calcining for 1-8h at 200-600deg.C so as to obtain the invented solid catalyst. Said catalyst can be used for preparing diphenyl carbonate, its productivity is up to 22.0% and its selectivity is up to 98.3%.

The invention discloses a process for preparing benzaldehyde by benzene oxidation and carbonylation by using benzene as reaction raw material, cobalt acetate as catalyst, trichloroacetic acid as solvent, oxygen as oxidizing agentconducting oxidation carbonylation reaction at the presence of nitrogen-containing or phosphonium-containing ligand, wherein the pressure of oxygen is 4-15 atm, the pressure of carbon monoxide is 8-40 atm, the reaction temperature is 50-150 deg. C, the reaction time is 10-72 hrs.

The invention relates to an intelligent reaction system and process for synthesizing dimethyl carbonate through liquid-phase oxidative carbonylation of methanol. The intelligent reaction system comprises a reaction tower, a buffer tank, micro-interface generators and an intelligent control unit. Oxygen and carbon monoxide are crushed to form micron-scale bubbles, so the reaction rate of oxygen andcarbon monoxide with liquid-phase methanol is increased; meanwhile, a gas-liquid emulsion is conveyed back to a reaction area through a second micro-interface generator for opposite impacting with agas-liquid emulsion output by a first micro-interface generator, and therefore, the retention time of the micron-scale bubbles in the reaction area is prolonged, gas and liquid phases are subjected toa secondary reaction, and the conversion rate of liquid-phase methanol is increased; and through the intelligent control unit, a worker can know the real-time situation of all data sent back by an intelligent sensing module at any time through a mobile device, and the inner temperature and the inner pressure of the whole reaction tower can be accurately controlled by changing preset values, so reaction efficiency is further improved.

The invention discloses a preparation method of a Cu nanoparticles-embedded ordered mesoporous carbon catalyst and belongs to the field of chemical heterogeneous catalysis. The preparation method comprises the following steps: Step 1, template mesoporous silica material SBA-15 filling-rolling over; Step 2, carbonization; and Step 3, silica removal. The process of template mesoporous silica material SBA-15 filling-rolling over comprises impregnation, dispersion, drying, pre-carbonization and single repetitive operation. The problem that catalytic activity of a catalyst will decrease with the reaction process is solved. The prepared chloride-free copper-based catalyst of the invention is a nanoscale catalyst with 5-25nm copper particles embedded in pores of and on the surface of the ordered mesoporous carbon. Dispersity is good, and migration and agglomeration are not easy to occur in the reaction process. The catalyst has high reaction activity and good stability when used in an atmospheric continuous fixed bed for methanol gaseous oxidative carbonylation for synthesis of dimethyl carbonate.

The invention relates to a preparation method of diester carbonate. The diester carbonate is produced through oxidation and carbonylation reaction of alcohols compound under the condition of the existence of a carbon monoxide, oxygen and liquid phase catalyzing system, wherein, the liquid phase catalyzing system contains a catalyst, at least one cocatalyst and at least one ion liquid consists of a positive ion and a negative ion, and the positive ion of the ion liquid has a nitrogen heterocyclic ring structure. The preparation method of the invention mainly uses the cocatalyst and ion liquid to enhance the activity of the catalyst and to further improve the catalysis efficiency, and has effects of improving reaction rate and increasing yield.

The invention discloses a method for synthesizing evodiamine by a carbonylation reaction three-step method. The method comprises that N, N-dimethylaniline as a reaction material undergoes an oxidativecarbonylation reaction to produce N-methylisatoic anhydride, the N-methylisatoic anhydride undergoes an aminolysis reaction to produce N-(2-indolylethyl)-2-(methylamino)benzamide and the N-(2-indolylethyl)-2-(methylamino)benzamide undergoes a cyclization reaction to produce an evodiamine compound. The method is a novel synthesis method, utilizes simple and easily available reaction raw materials,has simple synthesis processes, is carried out under mild reaction conditions, is easy to operate, satisfies the development requirements of green chemistry, and successfully synthesizes the evodiamine.

The invention relates to a method for synthesizing phenyl carbamate and the method uses selenium as catalyst, organic base as cocatalyst and aniline and alcohol as reactants. The method comprises the step of performing an oxidative carbonylation reaction under carbon monoxide and oxygen in an autoclave to obtain phenyl carbamate. The invention has simple process, easy operation, high atom economy, environmental friend, cheap and accessible raw materials and catalyst, low cost and high yield, the product is easy to separate and purify, the catalyst is easy to separate and reclaim and can be recycled.

The present invention is directed to a method for reactivating a deactivated carbonylation catalyst composition previously used in a carbonylation reaction involving an aromatic hydroxy compound, carbon monoxide and oxygen, such that the reactivated catalyst composition is effective at carbonylating an aromatic hydroxy compound in a subsequent oxidative carbonylation reaction.

The present invention provides carried non-mobile metal compound catalyst Cu(OAc)2/zeolite for synthesizing diphenyl carbonate and its preparation. The catalyst consists of zeolite in 50-100 weight portions and Cu(OAc)2 in 0.1-30 weight portions. It is prepared through equi-volume soaking and roasting at 250-750 deg.C. The catalyst system has metal acetate as inorganic oxidation-reduction assistant, hydroquinone as organic oxidation-reduction assistant, and tetrabutyl ammonium bridge as surfactant. The catalyst has very high catalytic activity and excellent selectivity to liquid phenol in synthesizing diphenyl carbonate. The catalyst is easy to separate from product, easy to recover and regenerate and has simple preparation process.

Disclosed is a method for producing dialkyl carbonate comprising: using organic halide metal catalyst fit with at least one catalyst promoter containing nitrogen atoms to form a catalyst system in the presence of alcohol compound, carbon monoxide and oxygen gas, and carrying out a liquid-phase oxidative carbonylation reaction to obtain dialkyl carbonate. The method for producing dialkyl carbonate uses organic halide metal catalyst fit with the catalyst promoter containing nitrogen atoms, thereby improving the conversion rate, selectivity of catalysis, and reaction yield, and reducing catalyst consumption and reduce the corrosion on reactor.

The present invention relates to a process for producing diaryl carbonates, which is to synthesize diaryl carbonates by oxidative carbonylation of phenols with carbon monoxide and oxygen, and in particular, to synthesize diphenyl carbonate from phenol. The present invention is characterized in that a catalytic system comprising a metal halide catalyst and one or more cocatalysts of nitrogenous heterocyclic compounds is used to increase the convertibility, selectivity and yield of this catalytic reaction.

The invention discloses a method for synthesizing dimethyl oxalate and by-producing dimethyl carbonate, which adopts industrial grade CO and O2 with a purity of more than 98 percent and industrial grade methanol with a purity higher than 99.5 percent as raw materials and NO as auxiliary material, so as to prepare dimethyl oxalate and by-produce dimethyl carbonate through nitrosation, oxidative carbonylation, and extraction and rectification circulation. The invention comprises four circulation loops: an NO/CH3ONO circulation loop consisting of an oxidative carbonylation reactor and a nitrosation reactor, a methanol circulation loop 1 consisting of a nitrosation reactor and a water separation tower, a water/ steam circulation loop consisting of an oxidative carbonylation reactor and a nitrosation reactor, and a methanol circulation loop consisting of a methanol cleaning tower and a methanol circulation tower. The invention provides a method used for synthesizing dimethyl oxalate and by-producing dimethyl carbonate from the CO with industrialized development value.

The present invention is directed to a method for reactivating a deactivated carbonylation catalyst composition previously used in a carbonylation reaction involving an aromatic hydroxy compound, carbon monoxide and oxygen, so that the re-activated catalyst composition is effective at carbonylating an aromatic hydroxy compound in a subsequent oxidative carbonylation reaction.

The present invention discloses preparation of nitrogen containing carbonyl compound, and is especially the process of preparing carbamate, urea and their derivatives as well as 2-oxazolidone through oxidizing and carbonylating organic amine compound in the presence of one kind of multifunctional catalyst. By using salt of VIII metal and Cu as main metal catalyst and the ionic solution of halogenated pyridine salt, quaternary ammonium salt or quaternary phosphate salt as co-catalyst and through oxidizing and carbonylating organic amine compound, carbamate, urea and their derivatives as well as 2-oxazolidone may be prepared at oxygen pressure of 0.2-1.0 MPa, CO pressure of 1.0-4.0 MPa, reaction temperature of 80-220 deg.c, and in reaction time of 0.5-4 hr. Compared with the technological process adopting traditional catalyst, the present invention has the advantages of simple system, easy preparation, mild reaction condition and high selectivity.