2546 results about "Tube 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 method for preparing aromatic hydrocarbons by methanol-containing raw materials. The methanol-containing raw materials comprise methanol and distilled gasoline. The method comprises that the methanol-containing raw materials and catalysts undergo a reaction under conditions of preparing aromatic hydrocarbons by methanol. The method provided by the invention solves the problems that in the prior arts, heat in a reactor is removed through an intermediate cooler and a multitubular reactor is utilized for heat removal or cold product gas is transmitted back to a raw material inlet to remove heat or a diluting material is added to control reaction heat. The method has the advantages of simple processes, and simple and convenient operation.

The invention relates to a polymer comprising units derived from ethylene, said polymer having: a) a Melt Index of from 0.05 to 20 g/10 min as determined by ASTM-1238 Condition E; b) at least 10 per 1000 C-atoms of short chain branches, containing five carbon atoms or less, as determined by C13 NMR, and less than 3.5 mol %, of units derived from a copolymerizable ethylenically unsaturated ester, c) a density of from 0.90 to 0.94 g/cm³, preferably 0.91 to 0.935 g/cm³, especially 0.92 to 0.93 g/cm³ as determined by ASTM D1505, and d) a relaxation time as described herein of at least 10 s. Such polymers are obtainable by polymerization by free radical polymerization using a chain transfer agent that incorporates into the polymer chain such as an alpha-olefin, preferably propylene, as a chain transfer agent, preferably in a tubular reactor under circumstances to favor LCB formation in a down stream part of the tubular reactor.

The polymer may be used for stretch hood film, preferably as a blown film coextruded tube comprising: a) a core of the above polymer; and b) a skin layer, on each side of the core which may be of the same or different composition, comprising at least 60 wt % of an LLDPE having density of 0.91 to 0.94 g/cm³ as determined by ASTM-D 1238 Condition E and hexane extractables less than 1.5 wt %, said skin layer containing less than 7500 ppm of anti-block particulates and said film having an elastic recovery after a 100% stretch of at least 40% and providing a normalized holding force per 100 μm thickness pre-stretch at 85% stretch after an initial stretch of 100% of at least 20 N/50 mm at a deformation rate of less than 10% of the starting length per second.

1,1,3,3,3-Pentafluoropropene (CF₃CH═CF₂, HFC-1225zc) can be produced by pyrolyzing 1,1,1,3,3,3-hexafluoropropane (CF₃CH₂CF₃, HFC-236fa) in the absence of dehydrofluorination catalyst at temperatures of from about 700° C. to about 1000° C. and total pressures of about atmosphere pressure in an empty, tubular reactor, the interior surfaces of which comprise materials of construction resistant to hydrogen fluoride.

The invention relates to a process of producing small molecular weight polyether amine by a continuous method. A continuous method fixed bed process is adopted, polyether, liquid ammonia and hydrogen are used as raw materials, 2-6 reactors which are fixed bed reactors or tubular reactors are connected in series and each reactor is internally filled by a Raney metal catalyst or a supported metal catalyst, respectively; under the reaction condition of certain temperature, pressure and molar proportion, the raw materials are sequentially reacted through the reactors to obtain polyether amine, the molecular weight of which is 100-1000. The process provided by the invention is simple in step. Multiple reactors and a compound catalyst system are adopted, so that the influence of generated water in the reaction to the catalyst efficiency is effectively reduced, and the yield and the conversion ratio of reaction are improved.

The invention relates to a process for the preparation of terpolymers of ethylene and at least 2 further olefinically unsaturated compounds by polymerization in a tubular reactor fitted with at least one side branch, wherein the fresh monomer components, which are introduced into the tubular reactor via the reactor inlet (the primary stream) or via the side branch or side branches (secondary stream or secondary streams), in each of the streams contain ethylene and at most one further olefinically unsaturated compound.

A method for continuous ethylene polymerization under high pressure using a polymerization reaction zone comprises a primary reaction zone and a secondary reaction zone wherein the secondary reaction zone has a length of 1.5-6.5 times the length of the primary reaction zone and a cross-sectional area of 1.2-4 times the cross-sectional area of the primary reaction zone. Ethylene is fed continuously into the primary reaction zone at the starting point of the primary reaction zone. Low temperature initiator alone, or an initiator mixture containing mainly low temperature initiator is introduced into the primary reaction zone at the starting point of the primary reaction zone. Initiator alone or an initiator mixture is introduced into the secondary reaction zone at two or more different points of the secondary reaction zone. Ethylene polymer products of various physical properties are produced with high productivity, while the pressure drop is minimized.

An electric motor is operatively connected to a reel for selectively storing, paying out, and rewinding an air lance of a device for unloading catalyst from tubular reactors. The electric motor powered reel provides improved on/off control of the air lance mounted on the reel, a braking force during withdrawal of the air lance from the reel, constant speed operation during rotation of the reel, and avoids the problem of lubricant contamination of the catalyst and reactor tubes.

The present invention relates to a process for preparing an alkylester of fatty acid with high purity via one-step continuous process by reacting an animal fat and/or vegetable oil with a lower alcohol in the presence of alkali catalyst by passing through a continuous tubular reactor while maintaining a single-phase, removing residual lower alcohol from the reaction mixture and removing residual glycerin, catalyst, etc. by phase separation. In accordance with the present invention, an alkylester of fatty acid can be produced with a high yield of 97% or more via one-step continuous process in a continuous tubular reactor without any limitation in flow types by reacting an animal fat and/or vegetable oil with a lower alcohol in the presence of alkali catalyst and carrying out a simple separating process.

A system is provided wherein a plug flow reactor is used to make combinatorial libraries of materials. Examples of plug flow reactors include stirred tube reactors, extruders, and static mixers.

The invention belongs to the field of carbon materials and electrochemistry, and discloses a heteroatom-doped porous graphite electro-catalyst and preparation and application thereof as well as a device. The method comprises the following steps: firstly adding concentrated HNO3 into a graphite oxide aqueous solution, performing sealing, ultrasonic reaction and stewing, and pouring the solution into deionized water for centrifugation, filtering and drying to obtain graphite oxide with holes in the surface; uniformly mixing the graphite oxide with holes in the surface, a heteroatom-doped source compound and a solvent to obtain a mixture, coating the surface of a substrate with the mixture, and performing freeze drying to obtain a solid thin film; putting the substrate loaded with the solid thin film into a plasma high-temperature tubular reactor for reaction to obtain the heteroatom-doped porous graphite electro-catalyst. The prepared electro-catalyst is higher in oxygen reduction electro-catalytic performance and is higher in electrochemical performance when applied in an electrode material; the electro-catalyst can be applied to the field of proton exchange membrane fuel batteries, direct alcohol fuel batteries and metal-air battery anode materials.

A slurry bed reaction equipment and method of using the same is provided, wherein the equipment comprises an ascending tube reactor 1 and a settling tube 4; the lower part of the ascending tube reactor 1 is a reacting region 14, while the upper part of the ascending tube reactor is a settling region 2 with tube diameter enlarged; the top of the settling region 2 is provided with an exhaust port 6; the bottom of the ascending tube is provided with a feed port 3 and a gas distributor 5; a pipeline 7 is used for connecting the settling region 2 with the settling tube 4, of which the opening position is arranged at the inside of the settling tube 4; the lower part of the settling tube 4 is a magnetic separation region 15, of which the lower end is communicated with the lower end of the ascending tube reactor 1 through a conical spout 10 and a reflux pipe 11; the upper part of the settling tube 4 is provided with a liquid discharging hole 13. The space utilization ratio of the reactor is improved by adopting the equipment and the separation method of the present invention; meanwhile, the separation technology combining settling, magnetic separation and filtering are adopted, making the separation part small in equipment volume, high in efficiency and space saving.

A combined catalytic converting process for preparing low-carbon olefin with high output includes such steps as contacting between heavy oil as raw material, regenerated catalyst and carbon deposited catalyst in flow-down tube reactor, cracking reaction, separating the cracked product from the catalyst to be regenerated, separating low-carbon olefin from cracked product, contacting between rest of said product and regenerated catalyst in flow-up tube reactor, reaction, separating oil gas from catalyst, separating low-carbon olefin from oil gas, and regenerating the catalyst.

Disclosed is an apparatus for production of vapor-phase growth carbon fibers. The apparatus can continuously produce these carbon fibers for a long time without blocking a furnace of tubular reactor of the apparatus. Also disclosed is a process for production of carbon fibers by means of the apparatus, a device for preventing deposition of carbon fibers on an inside of a furnace of tubular reactor, and vapor-phase growth carbon fibers produced in the apparatus.

The vapor-phase growth carbon fibers include carbon nanofibers and/or carbon nanotubes. The apparatus includes a furnace of tubular reactor, at an end of which a feedstock-supplying nozzle is provided, and a discharge pipe inserted in the furnace of tubular reactor, the top end of which faces the opening of the nozzle and the bottom end discharges the carbon fibers.

A process for catalytically reacting a fluid reactant mixture in a multi-tubular reactor system to form a fluid product, whereby the reactant mixture is led through at least one reactor tube containing a fixed bed of solid particulate catalyst and surrounded by a heat-exchange fluid, and whereby an upstream portion of the reactor tube is dedicated to pre-heating the reactant mixture and/or a downstream portion of the reactor tube is dedicated to post-cooling the product, characterized in that the upstream portion and/or downstream portion of the reactor tube contains a heat-exchanging essentially rod-shaped insert, the insert having a length of from 1 to 20%, preferably 1 to 5%, of the total length of the reactor tube.

A shell-and tube reactor including at least one reaction tube with a measuring means, substantially same solid particles being filled in the reaction tubes with or without the measuring means, a length of the filled solid particle layer, and a pressure drop thereof while passing a gas through the reaction tube, per each reaction tube, being substantially the same, respectively. By measuring the temperature of the catalyst particle layer, such a temperature as a representative can be gasped.