181results about How to "High space-time yield" patented technology

A catalyst for Fischer-Tropsch synthesis consists of Co 10.0-80.0 wt%, zirconia 15.0-85.0 wt% and other metal oxide 0-5.0 wt%, and is prepared by the codeposition process or soaking process. The catalyst has excellent stability, high reduction degree and high metal dispersivity.

The invention discloses a catalyst used in the preparation of ethanol through hydrogenation of acetate and a preparation method thereof. The catalyst uses Cu as an active component, SiO2 as a carrier and at least one selected from the group consisting of transition metal and alkali metal as an auxiliary agent. The copper-based catalyst provided in the invention has good stability and high activity, and has a low requirement for the content of the active component Cu, which only needs to be more than 15%. The preparation method provided in the invention has the advantages of simple operation, low cost and environment-friendliness and is benefit for industrial production.

The invention relates to a vinyl acetate catalyst, a preparation method and a vinyl acetate synthesis method which are mainly used for solving the problem of low catalyst activity in the prior art. In order to better solve the problem, the technical scheme adopted by the invention is as follows: the vinyl acetate catalyst provided by the invention comprises a carrier, 50-200 g/L zinc acetate and 0-10 g/L potassium acetate; the preparation method comprises the following steps: (a) performing microwave treating on activated carbon under a non-oxidizing atmosphere relative to the activated carbon to obtain the carrier; (b) loading the necessary dosage of zinc acetate and a cocatalyst by an impregnation method; (c) drying to obtain the catalyst. The vinyl acetate catalyst can be used in the industrial production of acetylene method vinyl acetate synthesis.

The invention discloses a catalyst for the methanation of carbon dioxide. The carrier of the catalyst is composite oxide of rare earth and other metals, and the composition of the catalyst is represented by a general formula of AxByOz, wherein in the formula, A is a rare metal, B is one or two metals from groups IIB, IIIA, VIA, IVB, VB and VIB, x is 0 to 1, y is 0 to 2, and z is 2 to 4; and the active component of the catalyst is nickel, and the nickel loaded on the carrier accounts for 1 to 15 percent of the total weight of the catalyst. Compared with the conventional carbon dioxide methanation technique, the catalyst technique disclosed by the invention, under the similar reaction conditions, can achieve a carbon dioxide conversion rate of 100 percent, a methane selectivity of 100 percent and a methane time space yield of more than 1,000g/kg.h.

The invention belongs to the oxalic ester preparation technical field, and provides a nano Pd catalyst used for preparing oxalic ester by CO gas phase oxidation coupling in coal glycol, its preparation method and its purpose. According to the invention, the catalyst takes alpha-alumina as a carrier, precious metal Pd nano particles are taken as an active component, by referring the weight of the catalyst carrier, the weight percentage content of the active ingredient Pd is 0.05-2%. The catalyst is prepared by using a nano metal in-situ loading method. The preparation method has the advantages of simple process and low energy consumption, and enables accurate regulation and control on the size and bare crystal face of the Pd nano particles. The catalyst with the bare crystal face of (lll) surface has the advantages of high Pd dispersiveness of active components, small size and narrow distribution, and can catalyze CO gas phase oxidation coupling to oxalic ester with high efficiency under low precious metal load capacity.

The invention provides a biomass glycol refining method. According to the method, a glycol crude product obtained by a biomass route is used as a raw material, 8th, 9th and10th group transition metal iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium and platinum are uses as catalyst active components, one step catalytic hydrogenation is performed in a fixed bed reactor at 40-160 DEG C under the hydrogen pressure of 0.2-10MPa to realize efficient refining of the crude glycol, the aldehyde content of the refined glycol product is less than 3ug/ g, and the UV transmittance at 220nm, 275nm and 350nm are respectively more than 75%, 92% and 99%. The crude glycol raw material comes from renewable resources, and has the advantages of being environmental friendly, green and renewable. In addition, the process has the advantages of short reaction time, good catalyst stability, good glycol UV transmittance, high space-time yield and the like, and has potential application prospects.

The invention provides a catalyst for hydrogenation, a preparation method thereof and use thereof. The chemical formula of the catalyst is CuOx-ROy/SiO2. The catalyst of the invention is used for hydrogenation in a gas-phase method for preparing glycol and is prepared from the raw materials including but not limited to oxalate or ethyl glycolate and hydrogen. The catalyst of the invention requires low reaction temperature and allows for a wide temperature range. The catalyst of the invention has extremely high operation elasticity, high activity and selectivity within a temperature range of 160 to 260 DEG C and a pressure range of 1 to 10 MPa, high time space yield, over 99 percent raw material conversion rate, over 96 percent target product selectivity, less than 0.1 percent by-product yield, high stability and a one-pass service life of up to 3,500 hours. The catalyst can greatly reduce energy consumption, save follow-up product separation equipment and procedures reduce production cost and avoid equipment corrosion and environmental pollution.

A multistage cobalt- or rhodium catalyzed hydroformylation of 6-24C olefins to alcohols and aldehydes comprises: (a) hydroformylation of the olefin to a conversion of 20-98%; (b) removal of the catalyst from the resulting reaction mixture; (c) separation of the resulting reaction mixture into a low boiling fraction containing olefins and paraffins and a sump fraction containing aldehyde and alcohol; and (d) reaction of the low boiling fraction containing olefin in further process stages comprising steps (a), (b) and (c) and combining all sump fractions from step (c) of all process stages.

The invention discloses a preparation method of a high-efficiency nitrogen-doped carbon nanotube. The preparation method comprises the following steps: adding a multiwalled carbon nanotube into a nitric acid solution; closing the solution in an autoclave; pressurizing to 0.4 to 1.0 MPa, and stirring; then heating to 120 to 200 DEG C and keeping for 1 to 4 hours; finally, cooling to room temperature by the autoclave; washing to neutral and carrying out suction filtration and drying; mixing the carbon nanotube with a melamine solid according to the mass ratio being 1 to (1 to 4), and uniformly grinding by using mortar; and carrying out high-temperature sintering in nitrogen, washing to neutral and then drying to obtain the nitrogen-doped carbon nanotube. The nitrogen doping amount of the high-efficiency nitrogen-doped carbon nanotube disclosed by the invention is 4.6 to 10.3 weight percent.

The invention discloses a method for preparing olefin polymer by utilizing multiple temperature reaction areas. The method provided by the invention comprises the following step of forming a plurality of olefin polymer reaction areas with different temperatures in a fluidized bed reactor by utilizing a circulating medium, wherein the circulating medium comprises an olefin monomer and a condensing agent. By utilizing the method, preparation of high-performance olefin polymer product by utilizing a single reactor is realized. The method is high in heat transfer efficiency. The olefin polymer prepared by utilizing the method is low in density, wide in distribution, uniform in degree of crystallinity and the like and can be widely applied to various fields of thin-film materials and the like.

The invention belongs to preparation of liquid fuel coproduced low carbon olefin by synthetic gas and particularly relates to a method for preparing the liquid fuel coproduced low carbon olefin by directly converting a catalyst and the synthetic gas. The synthetic gas is used as a reaction raw material and reacts on a fixed bed or a movable bed, wherein the catalyst is prepared from a component Aand a component B; the component A is metal oxide; the component B is a molecular sieve with an AEL structure or one or more of molecular sieves which are modified by metal and have the AEL structures; the space between geometric centers of catalyst A particles and catalyst B particles is between 2nm and 20mm; the weight ratio of the catalyst A to the catalyst B is 0.1 to 20. The pressure of the synthetic gas is 0.1 to 6MPa, the reaction temperature is 300 to 600DEG C, and the air speed is 500 to 8000h<-1>. Gasoline with high octane number is mainly produced by reacting, and low carbon olefinis coproduced; methane as a byproduct has low selectivity (smaller than 10 percent); the method has a good application prospect.

The invention discloses a jet flow fluidized bed reaction device which comprises two units, namely a polymerization reactor unit and a particle gas cycle conveying unit, wherein the polymerization reactor unit comprises a lower vertical cylinder (1), a middle variable-diameter enlargement section (2) and an upper enlargement section (3); and the particle gas cycle conveying unit comprises a primary cyclone separator (19) and a secondary cyclone separator (22). By utilizing the device disclosed by the invention, C1-C6 olefin feed gas is subjected to an olefin polymerization reaction by using a known addition polymerization catalyst. The jet flow fluidized bed reaction device has the advantages of simple structure, low cost and capability of performing large-scale polyolefin production.

The invention discloses a method for synthesizing sucrose fatty acid ester. The method comprises the following steps: by taking an ionic liquid or a double solvent of the ionic liquid and an organic solvent as a reaction medium, adding fatty acid or fatty acid ester and saccharides with hydroxyl to the reaction medium at a mole ratio of (1:3)-(4:1), and mixing for 3-7 minutes; and then adding lipase, and reacting for 4-48 hours to prepare the sucrose fatty acid ester. According to the method, an environment-friendly high-efficiency reaction system for synthesizing sugar ester through an enzymic method is established by designing and optimizing a reaction condition in a pure ionic liquid system and a double-solvent system; especially, the solubility of a matrix and a product is enhanced through the ionic liquid and tertiary amyl alcohol in the double-solvent system, so that the space time yield of the sugar ester is enhanced, a purifying process of the sugar ester is simplified, and the efficiency is improved.

The invention aims to provide a method of using isobutylene or tert-butyl alcohol as raw material to prepare isobutyraldehyde. The method prepares isobutyraldehyde through two steps as follows: (1) under the action of molybdenum-bismuth base composite oxide catalyst, isobutylene or tert-butyl alcohol selects oxidation to prepare methacrolein; (2) under the action of supported hydrogenation catalyst, methacrolein selects hydrogenation to prepare isobutyraldehyde. The raw material in the method is cheap and easy to get, which breaks the dependence of the prior isobutyraldehyde production on expensive C3 propylene raw material and opens up a brand new process route for preparing isobutyraldehyde through C4 raw material low in chemical utilization ratio. The method is high in the yield coefficient of isobutyraldehyde, simple in process, low in production cost and convenient for mass production.

The invention relates to a catalyst for preparing methyl alcohol from syngas. The preparation method of the catalyst comprises the following steps: putting a CuO/ZnO/Al2O3 catalyst into a container, adding a rhodium salt solution with the same volume, immersing for 6-48 h, and then drying for 8-16 h at 80-120 DEG C; roasting the obtained product for 3-6 h at 300-400 DEG C to obtain the catalyst comprising 40-65 percent of Cu, 25-40 percent of Zn, 2-20 percent of Al and 0.1-0.2 percent of Rh in molar ratio. The catalyst has the advantages of high activity and good stability.

The invention discloses a porous carbon-loaded cobalt-based Fischer-Tropsch synthesis catalyst containing a silicon dioxide auxiliary agent and a preparation method thereof. The catalyst uses cobalt as an active component, silicon dioxide as the auxiliary agent and porous carbon as a carrier, and the mass percentages of cobalt and silicon dioxide are 25.8 to 30.6% and 6.2 to 21.0% respectively, with the balance being the porous carbon carrier. Metallic cobalt particles are uniformly distributed on the catalyst and densely arrayed; the diameters of the particles are in a range of 6 to 9 nm; and the silicon dioxide auxiliary agent exists on the surfaces of the particles. According to the invention, a CO-MOF-71 metal-organic framework is used as a sacrificial template, a silicon source is doped by using an impregnation method, and then the silicon dioxide-supported porous carbon-loaded cobalt-based catalyst is prepared on a fixed bed through one-step in-situ pyrolysis method. The catalyst prepared in the invention has high specific active site density; and when applied to Fischer-Tropsch synthesis, the catalyst has good C<5+> selectivity, especially high C<5+> space-time yield, on the basis of high activity.

The invention relates to a method for preparing biological ethylene by the use of catalytic action and dehydration of rare-earth lauryl heteropoly tungstic acid salt. The main technology process is that: the ethanol solution of rare-earth lauryl heteropoly tungstic acid salt is solid supported by the process of being leached and adsorbed by carriers such as active carbon or molecular sieve or Gamma-alumina, etc, being dried and baked, etc., and then is loaded in a tubular reactor and reacts under normal pressure, at 150 DEG C to 190 DEG C for 10 minutes with airspeed of the ethanol vapor being controlled from 30 to 50 per hour. The space time yield of ethylene is 88.3 percent and no aether is detected in the result. The invention provides the method for preparing biological ethylene, and reaction temperature is 150 DEG C to 250 DEG C lower than that of conventional oxide catalyst and 60 DEG C to 100 DEG C lower than that of molecular sieve catalyst. Furthermore, space time yield increases by 10 percent to 30 percent, reaction selectivity is greatly high and almost no aether is founded. The catalyst has excellent nature and stability.

The invention belongs to the direct preparation of ethylene by hydrogenation of carbon monoxide, concretely relates to a bifunctional catalyst and a method for preparing ethylene with carbon monoxidehydrogenation. Carbon monoxide and hydrogen are use as raw materials and are subjected to conversion reaction on a fixed bed or a moving bed; the catalyst is a composite catalyst formed by mixing component A and component B; the active ingredient of component A is a metal oxide, and component B is an aliphatic amine-modified molecular sieve of an MOR structure; and the weight ratio of the active ingredient of component A to component B is in the range of 0.1-20, preferably 0.3-8. The reaction process has higher product yield and selectivity, and the selectivity of C2-C3 olefins reaches up to 78-87%, wherein the selectivity of hydrocarbon products of more than four C atoms is lower than 10%, the selectivity of by-product methane is lower than 9%, and the selectivity of ethylene reaches 75-82%. Therefore, the bifunctional catalyst has good application prospect.