94 results about "Trickle-bed reactor" patented technology

A process where the need to circulate hydrogen through the catalyst is eliminated. This is accomplished by mixing and/or flashing the hydrogen and the oil to be treated in the presence of a solvent or diluent in which the hydrogen solubility is “high” relative to the oil feed. The type and amount of diluent added, as well as the reactor conditions, can be set so that all of the hydrogen required in the hydroprocessing reactions is available in solution. The oil/diluent/hydrogen solution can then be fed to a plug flow reactor packed with catalyst where the oil and hydrogen react. No additional hydrogen is required, therefore, hydrogen recirculation is avoided and trickle bed operation of the reactor is avoided. Therefore, the large trickle bed reactors can be replaced by much smaller tubular reactor.

A continuous liquid phase hydroprocessing process, apparatus and process control systems, where the need to circulate hydrogen gas through the catalyst is eliminated. By mixing and/or flashing the hydrogen and the oil to be treated in the presence of a solvent or diluent in which the hydrogen solubility is high relative to the oil feed, all of the hydrogen required in the hydroprocessing reactions may be available in solution. The oil/diluent/hydrogen solution can then be fed to a plug flow reactor packed with catalyst where the oil and hydrogen react. No additional hydrogen is required; therefore, the large trickle bed reactors can be replaced by much smaller tubular reactors. The amount of hydrogen added to the reactor can be used to control the liquid level in the reactor or the pressure in the reactor.

A process where the need to circulate hydrogen through the catalyst is eliminated is provided. This is accomplished by mixing and/or flashing the hydrogen and the oil to be treated in the presence of a solvent or diluent in which the hydrogen solubility is “high” relative to the feed. The type and amount of diluent added, as well as the reactor conditions, can be set so that all of the hydrogen required in the hydroprocessing reactions may be available in solution. The oil/diluent/hydrogen solution can then be fed to a plug flow reactor packed with catalyst where the oil and hydrogen react. No additional hydrogen is required, therefore, hydrogen recirculation is avoided and trickle bed operation of the reactors is avoided. Therefore, the large trickle bed reactors can be replaced by much smaller tubular reactor.

The invention provides a catalyst for converting diisononyl phthalate, diisooctyl phthalate, dibutyl phthalate and other long-chain esters into corresponding 1, 2-cyclohexane dicarboxylic acid binary ester through hydrogenation. The catalyst for converting the diisononyl phthalate, the diisooctyl phthalate, the dibutyl phthalate and other long-chain esters into corresponding the 1,2-cyclohexane dicarboxylic acid binary ester through the hydrogenation consists of main active ingredients, additives and carriers, wherein the main active ingredients are noble metal Ru and Pd; the additives are Fe, Co, Ni, Cu and other metals or oxides; and macroporous Al2O3, ZrO2, TiO2 and the like are selected as the carriers. Under certain temperature, certain hydrogen pressure and the action of the catalyst, the diisononyl phthalate, the diisooctyl phthalate, the dibutyl phthalate and other long-chain esters in a trickle bed reactor can be converted into the corresponding the 1, 2-cyclohexane dicarboxylic acid binary ester with high activity and high selectivity.

The present invention relates to a process for converting byproducts of the manufacture of biodiesel into industrially useful oxygenated products of greater commercial value. The process includes a trickle bed reactor in which a glycerol-rich feedstock is reacted with hydrogen in the presence of a nickel-tungsten catalyst under typical refining condition of high temperature and pressure, yielding propane synfuel or propanediols.

The invention discloses a technological process for continuously producing succinic anhydride and co-producing succinic acid through maleic anhydride catalytic hydrogenation. The whole process comprises three steps, namely, reaction, rectification and hydrolysis, wherein two stages of hydrogenation reactors are used for reaction, a primary hydrogenation reactor is a fixed bed reactor with hydrogen entering from the lower part and reaction liquid exiting from the upper part, and a secondary hydrogenation reactor is a trickle bed reactor with hydrogen and reaction liquid entering from the upper part and exiting from the lower part. The technological process adopts an external circulating heat radiation manner, and reaction heat is uniformly removed, so that the average operation temperature of the whole reactor is effectively controlled, and the reaction temperature in the whole main reactor is balanced. Furthermore, the primary hydrogenation reactor adopts the manner that both the maleic anhydride solution and hydrogen flow upward simultaneously, so that the reaction temperature of the whole reactor is controlled to be balanced, local hot spot temperature is effectively controlled and lowered, and the reactants are prevented from polymerizing and depositing carbon or coking.

The invention relates to a reaction system for alkyl nitrite and a preparation method for the alkyl nitrite. The preparation method comprises the following steps that: a trickle-bed reactor is adopted and porcelain ring filler is filled into the trickle-bed reactor; liquid added into the reactor forms liquid membranes on the filler; alkyl alcohol is taken as a liquid-phase raw material and nitric monoxide, oxygen and nitrogen are taken as gas-phase raw materials; and gas and liquid phases are reacted in the trickle-bed reactor by means of co-current flow or countercurrent flow under the condition of nitrogen protection so as to generate the alkyl nitrite. The mol ratio of the alkyl alcohol to NO is between 2 to 1 and 7 to 1, and the mol ratio of the NO to O2 is between 4 to 1 and 8 to 1; the reaction temperature is between 40 and 100 DEG C, and the reaction pressure is between 0.1 and 1.0 MPa; and the retention time of continuous feeding of liquid-phase alkyl alcohol in the trickle-bed reactor is between 10 and 500 minutes, and the retention time of continuous feeding of gas phase in the trickle-bed reactor is between 0.02 and 1 minute. The reaction system and the preparation method have the advantages that: the operating condition is mild; the reaction time is short; the conversion rate of the raw materials, and the selectivity and the yield of products are high; and the whole reaction system is convenient for realizing continuous production, etc.

The invention relates to a trickle-bed reactor, which mainly aims at solving the problem that the uneven liquid-gas distribution of the trickle-bed reactor in the prior art results in the bad trickling effect of the reactor and low efficiency of the catalytic reaction. The trickle-bed reactor adopts the technical scheme that the trickle-bed reactor comprises an inlet orifice, a reactor shell, a liquid-gas distributor, a porcelain ball bed layer, a catalyst bed layer and an orifice ring, wherein the liquid-gas distributor is provided with a gas passage pipe and a liquid passage pipe on a distributing plate; the gas passage pipe is composed of a cone roof and a straight nozzle stub; the liquid passage pipe is a vertical nozzle stub with the upper end extending 10 to 100mm out of the upper part of the distributing plate and the lower end extending 200 to 1000mm out of the lower part of the distributing plate; a plurality of pinholes are evenly opened on the cross section at different positions along the axial direction to form the liquid-gas distributor. The technical scheme better solves the problem, greatly improves the reaction efficiency of the trickle-bed reactor and can be applied to various gas liquid and solids three-phase reactors.

The invention discloses a monolithic catalyst for hydrogen peroxide production through a pentylanthraquinone process and a preparation method thereof. The catalyst comprises an active component, a co-catalyst, and a carrier; wherein the active component is a combination of one or more elements of platinum group precious metals, the active component (calculated by single substance of precious metals) accounts for 0.01 to 5% of the total mass of the monolithic catalyst, and Pd (calculated by single substance) accounts for 50 to 100% of the total mass of the precious metals. Furthermore, the provided monolithic catalyst can be produced through a simple impregnation method, the preparation method is simple, the preparation process is easy to control, and the prepared monolithic catalyst has a high catalytic activity and selectivity in the hydrogenation reactions of 2-pentylanthraquninone. The provided monolithic catalyst integrates the advantages of conventional slurry bed reactor and trickle bed reactor together and discards the disadvantages of conventional slurry bed reactor and trickle bed reactor, so the efficiency of selective hydrogenation of 2-pentylanthraquinone is improved.

The invention provides a process for continuously producing succinic anhydride through hydrogenation of maleic anhydride, which comprises the following steps of: shunting solution of maleic anhydride in a split ratio of 1/5-1/2 after hydrogenation is performed on the solution of maleic anhydride through a trickle bed reactor; rectifying partial shunted reaction liquid into a rectifying tower to obtain finished products succinic anhydride and a solvent, and recycling the solvent; mixing the other liquid with the solution of maleic anhydride; and returning to the reactor after eliminating heat through a heat exchanger. The process successfully solves the problem of exothermic effect in the process of preparing the succinic anhydride through the hydrogenation of the maleic anhydride, meanwhile realizes continuous production of the succinic anhydride, and greatly improves the production capacity of the succinic anhydride with above 97.5 percent of the yield of the succinic anhydride; the process has the advantages of simple flow, high utilization rate of devices and good quality of products; the solvent can be recycled, and the operation cost is low; and the process is suitable for clean production and has good environmental benefit.

The invention relates to a liquid-gas distributor of a trickle-bed reactor, which aims at solving the problems that the uneven liquid-gas distribution of the trickle-bed reactor in the prior art results in the uneven fluid distribution inside the layer of a catalyst bed; the trickling effect is not good; and the efficiency of the catalytic reaction is not well. The liquid-gas distributor adopts the following technical scheme: the liquid-gas distributor is provided with a gas passage pipe and a liquid passage pipe on a distributing plate; the gas passage pipe is composed of a cone roof and a straight nozzle stub; the liquid passage pipe is a vertical nozzle stub with the upper end extending 10 to 100mm out of the upper part of the distributing plate and the lower end extending 200 to 1000mm out of the lower part of the distributing plate; a plurality of pinholes are evenly opened on the cross section at different positions along the axial direction to form the liquid-gas distributor. The technical scheme better solves the problems, greatly improves the reaction efficiency of the trickle-bed reactor and can be applied to various trickle-bed reactors.

The invention discloses a heterogeneous catalyst adopting a hierarchical pore structure and adopting phosphine-containing organic mixed polymer-metal as well as preparation and an application of the heterogeneous catalyst in production of aldehyde with a high normal/isomeric ratio through internal olefin hydroformylation. In the heterogeneous catalyst, one, two or three of metal Rh, Co and Ir are taken as active components, and a phosphine-containing organic mixed polymer adopting the hierarchical pore structure is taken as a carrier and is prepared from multidentate organic phosphine ligands containing alkylene and monodentate organic phosphine ligands through copolymerization. The coordinate bond type heterogeneous catalyst is applicable to a fixed bed reactor, a slurry bed reactor, a bubble column reactor, a trickle-bed reactor and other reactors. The provided heterogeneous catalyst has good presentation in the internal olefin hydroformylation reaction, internal olefins are firstly isomerized to be terminal-group olefins under the action of the catalyst, a hydroformylation reaction is performed, corresponding normal aldehyde is selectively generated, accordingly, the normal/isomeric ratio of the product aldehyde is high and can be higher than 15, and the content of alkane in the obtained product is lower than 1%.

The invention discloses a catalyst for hydro-conversion of a mixture aqueous solution containing alcohol, aldehyde, acid, ester and the like into corresponding alcohols. The catalyst mainly comprises three parts including a main active constituent, an auxiliary and a carrier. The main active constituent is one or more of precious metals including Re, Ru and Pd, the auxiliary is one or more of metals, including Ag, Ni, Cu and the like, or oxides thereof, and the carrier is selected from activated carbon, Al2O3, SiO2 and the like. Under the actions of the catalyst, the mixture aqueous solution containing alcohol, aldehyde, acid, ester and the like in a trickle bed reactor can be converted into a corresponding alcohol aqueous solution in high activity and high selectivity ways under the conditions with certain temperature and pressure.

The invention relates to a continuous production process for preparing succinyl oxide by maleic anhydride hydrogenation, including the following steps: (1) maleic anhydride and solvent are dissolved in a dissolution tank, and preheating is carried out by virtue of a maleic anhydride heater; (2) maleic anhydride after preheating is mixed with hydrogen preheated by a hydrogen preheater, the mixture enters into a trickle bed reactor filled with hydrogenation catalyst, and maleic anhydride hydrogenation reaction is carried out; (3) reaction product and residual hydrogen pass through a gas-liquid separator, separated liquid phase product is conveyed into a distillation tower, and distillation is carried out, thus obtaining the finished product succinyl oxide; (4) solvent separated by the distillation tower is recycled; (5) the residual hydrogen separated by the gas-liquid separator is returned to the hydrogen preheater again. Result shows that maleic anhydride conversion rate is 100%, selectivity of product succinyl oxide is more than 98%, the production efficiency of continuous production process is four times higher than that of batch stirring kettle process, and the service life of catalyst is prolonged by more than five times.

The invention discloses a phosphine-containing organic mixed polymer-metal heterogeneous catalyst and its use in butyraldehyde production. The heterogeneous catalyst comprises one, two or three of Rh, Co and Ir as active ingredients and utilizes a multistage pore-structure phosphine-containing organic mixed polymer as a carrier. The phosphine-containing organic mixed polymer is prepared from an alkylene-containing polydentate organic phosphine ligand and a single dentate organic phosphine ligand through copolymerization. The coordination bond-type heterogeneous catalyst is suitable for a fixed bed reactor, a slurry bed reactor, a bubbling bed reactor and a trickle-bed reactor. The heterogeneous catalyst has good effects in hydrogen-propene formylation preparation of butyraldehyde, can produce high-normal/isomeric ratio butyraldehyde with a normal/isomeric ratio of 25 or more and realizes product propane content less than 0.1%. The heterogeneous catalyst has good stability and can be simply and efficiently separated from reactants and products.

The invention discloses a method for preparing 1,3-cyclohexanebis(methylamine). The method is characterized in that a reaction system comprises m-xylylenediamine, ammonia (or an organic amine), hydrogen and a catalyst; a reaction temperature is in a range of 90 to 200 DEG C; reaction pressure is in a range of 1.0 to 20.0MPa; a mole ratio of H2 to m-xylylenediamine is in a range of 10-200; a weight ratio of m-xylylenediamine to NH3(or an organic amine) is (3 to 40): (60 to 94); an airspeed of a m-xylylenediamine liquid is in a range of 0.3 to 1.8h<-1>; the catalyst adopts Al2O3, active carbon or SiO2 as a carrier and is loaded with one or more of precious metals of Ru and Pd as active ingredients and preferably, is loaded with Ru; one or more auxiliary agents are selected from Ni, Cr, Co, Fe and their oxides; and in a trickle-bed reactor, under the ammonia (or an organic amine) reaction of the catalyst, the high activity and high selectivity transformation of a m-xylylenediamine liquid into 1,3-cyclohexanebis(methylamine) is realized.

The invention discloses a reaction-distillation coupling preparing acetic acid series ester method, which comprises the following steps: using glacial acetic acid and alcohol with lower five carbons (alcohol, optal,alcohol isopropylicum, butanol, isobutanol, amyl alcohol and isoamyl alcohol ) for raw material; adopting modified strong acidic phenylethene series basic ion exchange resin for accelerant; preparing by reaction-distillation coupling; getting acetic acid ethyl ester, propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, amyl acetate and iso-amyl acetate; making glacial acetic acid and alcohol with lower five carbons to carry on esterification reaction by solid acid catalysis in trickle bed reactor; adding reaction product (acetic acid ethyl ester, propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, amyl acetate and iso-amyl acetate), water and cycle still liquor in fractionating tower; getting acetic acid ethyl ester, propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, amyl acetate and iso-amyl acetate by separating at the top of the tower. The conversion rate of alcohol with lower five carbons is more than 96%, the recovery ratio of acetic acid ethyl ester (propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, amyl acetate and iso-amyl acetate) is more than 95%. The invention has high alcohol conversion rate, which simplifies the operation.

The invention relates to a synthesis method of cyclohexane polyacid ester. The method specifically comprises the following steps of: adding benzene polycarboxylic acid or anhydride thereof and alcohol into a stirring tank reactor; adding in an acid catalyst and raising the temperature to 200-240 DEG C; carrying out some reaction until an acid value is less than 0.2 mg KOH/g; directly adding a crude product resulting from the esterification reaction into a trickle bed reactor for hydrogenation reaction, wherein the hydrogen pressure is 40-100 bar, the temperature is 70-250 DEG C, and a catalyst is a porous oxide loaded with VIII B group metal; and after the reaction, adding in alkali for neutralization and acid removal, performing distillation or evaporation to remove alcohol, removing by-products; and performing filtration and deliming to obtain cyclohexane polyacid ester. According to the method provided by the invention, after the esterification reaction generates the crude product, no purification step is not performed; excess alcohol is used as a solvent for subsequent hydrogenation reaction; and after the hydrogenation reaction, purification steps such as alcohol removing, acid removing and filtration are performed, thereby saving time and energy. Meanwhile, according to the method provided by the invention, the alumina-magnesia composite oxide is used as the catalyst carrier, and palladium or ruthenium is selected as the metal catalyst, enabling the phenyl ring hydrogenation rate to be greater than 99.9%.

The invention discloses a catalyst for preparing C5 or C6 alkane from sugar or sugar alcohol via water-phase hydrogenolysis, and an application of the catalyst. The catalyst takes one or two of active carbon, ZrO2, TiO2, and Nb2O5 as a carrier, and takes a metal of Ru as an active metal. An oxide of Mo, Sn, or Mn is taken as an auxiliary agent. The metal of Ru takes 0.5-10.0% by mass percentage of the carrier. The atom mol ratio of Ru and Mo, Sn, or Mn is in a range of 0.2:1.0-5:1.0. The catalyst has excellent stability, can continuously stably operate more than 500h in a trickle bed reactor, and can be used for water-phase hydrogenolysis of sugar/ sugar alcohol and is high in activity to obtain C5/C6 alkane with a high yield. The problem that silicon-aluminum oxide or a molecular sieve supported catalyst is relatively poor in stability is solved.

The one-step process of preparing hydantoin is that in a trickle bed reactor hydroxy methyl cyanide, CO2 and ammonia as material and solid acid as stuffing and catalyst are prepared into hydantoin through one-step process. Hydroxy methyl cyanide is made to flow into the trickle bed from the top in the flow rate of 100-300 ml/hr, CO2 and ammonia are made to flow into the trickle bed from the bottom in the flow rate of 0.01-0.1 cu m/hr and 0.005-0.06 cu m/hr separately, and through reaction at 40-120 deg.c for 2-5 hr, the reaction liquid is collected and processed through concentration, crystallization, filtering to obtain initial crystal, recrystallization and drying to obtain hydantoin. The synthesis yield may reach 74.85 %.

The invention discloses a method for the biological diesel oil preparation by using anion exchange resin catalyzing vegetable oil, and the method is characterized in that catalyst is packaged in small packets to be filled into a trickle bed reactor to form a catalyst bed layer, methanol steam is accessed into the bottom part of the trickle bed, after the catalyst bed layer is heated to be 65 to 100 DEG C, vegetable oil is accessed from the top part of the trickle bed, and the residence time of the vegetable oil in the trickle bed is controlled for 100 to 300 min, thereby biological diesel oil is obtained through performing distillation reseparation on the reaction product obtained. The invention adopts gas-liquid mass transfer, and the mass transfer effect is good, thereby the working procedure of continuous blending and the energy consumption needed in the traditional method can be avoided; the invention adopts the anion exchange resin catalyzing vegetable oil as the catalyst, thereby avoiding the subsequent working procedures of catalyst separating, etc., and simultaneously avoiding a great amount of waste water generated when the basic catalyst is neutralized; the anion exchange resin can be reused, and the cost is reduced; the invention adopts the trickle bed reactor to produce the biological diesel oil, and is suitable for the continuous and large scaled production.

The invention relates to a coal tar whole-fraction hydrogenation method. Medium/low-temperature coal tar whole-fractions are used as raw materials, catalytic hydrogenation and distillation treatments are carried out in a trickle bed reactor through a hydrogenation protective agent, a hydrodemetallization agent, a hydrodesulfurization agent, a hydrodenitrogenation agent and a hydrocracking agent, and then a gasoline fraction and a diesel oil fraction are cut. The coal tar whole-fraction hydrogenation method is simple in process flow; a product is high in conversion rate and high in quality; and the whole process is safe and stable in operation.