32results about How to "Reduce the amount of fine powder" patented technology

The invention relates to supported Ziegler-Natta catalyst components based on water-bearing silica gel (water content 0.5-8.0wt percent), which comprises the supported Ziegler-Natta catalyst and catalyst components of the supported Ziegler-Natta catalyst components, and a preparation method of the catalyst. The supported Ziegler-Natta catalyst is applied to homopolymerization of catalytic olefin and copolymerization of two or more than two different olefins. The supported Ziegler-Natta catalyst of the invention has low production cost, stable and easily controllable kinetic curve when being used in homopolymerization and copolymerization of catalytic olefin and stable active release; besides, polymers produced by the invention have low contend of fine powder and oligomer of the polymer and narrow particle size distribution of the polymer.

The invention relates to the field of spray dryers and discloses a centrifugal atomizing nozzle and a spray dryer comprising the same. The centrifugal atomizing nozzle comprises a centrifugal atomizer and a protection wind guide pipe, wherein the centrifugal atomizer is internally provided with an atomizing disc which is used for spraying materials into fog drips and provided with atomizing holes, and a material guide pipe connected with the atomizing disc and a material inlet; and the protection wind guide pipe is provided with a protection wind inlet and a protection wind spraying opening. The protection wind guide pipe is arranged around the centrifugal atomizer, so that protection wind sprayed by the protection wind spraying opening surrounds the fog-drip-shaped materials sprayed by the atomizing holes. When spray drying is conducted by adopting the dryer comprising the centrifugal atomizing nozzle, the problems that microspheres are burst, abnormal shapes and fine powder are produced in the drying process can be solved, and the sphericity of obtained dried particles can be improved.

The invention discloses a flue gas desulfurization and denitration system. The system comprises a bag deduster, a booster fan, a waste heat boiler, an adsorption tower and a regeneration tower, the outlet of the bag deduster is communicated with the flue gas inlet of the waste heat boiler through the booster fan, the flue gas outlet of the waste heat boiler is communicated with the flue gas inletof the adsorption tower, the flue gas outlet of the adsorption tower is communicated with the chimney, a material outlet at the bottom of the adsorption tower is communicated with a material inlet atthe top of the regeneration tower, a material outlet at the bottom of the regeneration tower is communicated with a material inlet of a vibrating screen, and the oversize product outlet of the vibrating screen is communicated with a material inlet at the top of the adsorption tower. The system has the advantages of high long-term running stability, high safety, high desulfurization and denitrationefficiency, and realization of safe and ultralow emission of the flue gas.

The invention discloses a method for preparing a spherical magnesium chloride carrier. The method comprises the following steps of: performing alcohol combination reaction on magnesium chloride and fatty alcohol (ROH), dispersing, quenching, solidifying and drying to obtain a carrier precursor, performing primary alcohol removal on the carrier precursor in inert airflow at the temperature of between 30 and 40 DEG C, heating to the temperature of between 41 and 55 EG C, performing secondary alcohol removal, and thus obtaining the spherical magnesium chloride and alcohol carrier. An olefin polymerization catalyst prepared from the carrier obtained after alcohol removal by the method has high catalytic activity, the granular size of the olefin polymerization catalyst is increased, and the fine powder quantity of the olefin polymerization catalyst is reduced.

The invention discloses an entrained-flow bed gasification furnace for coal hydrogenation, which consists of a furnace body (1), a feed nozzle (3), a gasification chamber (2) and a semi-coke collection tank (7) and is characterized in that the furnace body (1) is divided into an upper part, a middle part and a lower part; the upper part of the furnace body (1) is a vertical section; the middle part of the furnace body (1) is an expansion section (6); the V-shaped semi-coke collection tank (7) is arranged at the lower part of the furnace body (1); the gasification chamber (2) is arranged at the upper part of the furnace body (1); the feed nozzle (3) is positioned at the top end of the gasification chamber (2); a coil heat exchanger (8) for preheating the feed gas is arranged between the gasification chamber (2) and the upper part of the furnace body (1); a product gas outlet (11) is formed in the furnace body (1) above the coil heat exchanger (8); a high-pressure gas spray pipe (5) is arranged at the lower part of the expansion section (6) of the furnace body (1); a discharge port (12) is formed at the bottom of the semi-coke collection tank (7). The entrained-flow bed gasification furnace disclosed by the invention has the advantages of low energy consumption, low hydrogen consumption and light dedusting load.

The invention discloses a mesalazine enteric-coated sustained release tablet. The mesalazine enteric-coated sustained release tablet is characterized by consisting of the following components in a unit dose: 1.2g of mesalazine, 0.1-0.3g of a sustained release material, 0.004.0.03g of a lubricant and 0.02-0.1g of enteric-coated powder. The release of the mesalazine enteric-coated sustained release tablet in one hour in simulated intestinal fluid of which the pH value is 7.2 is less than 30%, the release in four hours is not more than 70%, and the release in eight hours exceeds 80%.

The invention discloses a continuous vertical feeding system and method for a fluidized bed reactor. The feeding system comprises a supply system, a vertical discharging section, a horizontal conveying section, a gas conveying system and a pressure adjusting assembly which are connected in sequence. The other end of the horizontal conveying section is connected with a fluidized bed reactor, and the pressure adjusting assembly is connected with the supply system and the gas conveying system. The self-weight of a solid particle reaction material and the effect of an input gas are used to make particle materials uniformly fluidized and transferred to the vertical discharging section from the supply system, then transferred to the horizontal conveying section and continuously uniformly conveyed into a fluidized bed reactor, so the particle material abrasion caused by mechanical feeding is avoided, the fine powder amount is reduced, the entrainment loss of gas-solid reaction is further reduced, the gas amount introduced by pneumatic feeding is greatly reduced, and great benefits are brought to chlorination production.

The invention discloses a method for manufacturing a moisture-free granular flavoring, which comprises the following steps of suspension preparation, mixing, granulation, drying, cooling and screening. The method overcomes the defects of the prior granular flavoring manufacturing method by improving the mixing process of the granular flavoring, and can produce the granular flavoring with good moisture resistance and avoid the problem that the granular flavoring absorbs moisture during use in a kitchen.

The invention relates to a novel crank pull rod type vibration fluid bed drying machine which comprises a machine body. A sieve plate is arranged inside the machine body, a vibration cross beam which supports the machine body is arranged on the lower portion of the machine body, and the vibration cross beam is connected with a driving motor through a linkage mechanism. The vibration cross beam rotates under the driving of linking rods, so that the machine body moves up and down and front and back. The novel crank pull rod type vibration fluid bed drying machine is wide in application range, good in drying quality and high in efficiency.

The preparation process of the solid component of olefin polymerizing catalyst includes first reaction of C2-C8 alcohol and magnesium powder in the molar ratio of 2.0-4.0 in the presence of methane halide to form homogeneous magnesium ligand solution; subsequent addition of electron donor compound to form homogeneous solution and the reaction between the solution with titanium compound to form Mg-Ti ligand solution; the contact reaction between the solution with inorganic oxide carrier to prepare solid catalyst precursor; and final activation of the precursor with alkyl aluminum chloride to obtain the solid catalyst. The solid component of catalyst of the present invention is matched with alkyl aluminum for the polymerization of ethylene and has high catalytic activity and polymer prepared with very small amount of fine powder.

The invention relates to a device for removing dust in tablets of a tablet press. An interlayer is arranged in the middle of a rectangular tank body formed by stainless steel plates and divides the rectangular tank body into an upper cavity and a lower cavity. The interlayer is a 12-mesh stainless steel screen, and a detachable stainless steel cover is arranged on the upper cavity of the rectangular tank body. A bevel is arranged at the front end of the upper cavity, and the front end of the upper cavity is manufactured into a connector connected with the press, the rear end of the rectangular tank body is provided with a bevel, the upper cavity of the rectangular tank body is longer than the lower cavity, a stainless steel connector is welded and fixed to the lower portion of the rear end of the lower cavity, and the connector is used for being connected with a tablet press dust collector. The device has a good dust moving effect and is low in noise, low in cost, free of occupied area and low in fault rate, pollution caused by dust to air is effectively controlled, and cross contamination between medicines is effectively controlled.

The invention discloses an impact crusher. The impact crusher comprises a lower shell, a rack, a transmission device, a rotor, an upper shell, an impact plate, an adjusting device and the like, wherein a pre-screening channel is formed in the lower shell, a pre-screening device is arranged at a feeding port formed by the upper shell and the lower shell and used for pre-screening materials at the feeding port, fine materials subjected to pre-screening enter the pre-screening channel and then are output through a discharging port. After the materials are sorted by the pre-screening device, fine materials enter the pre-screening channel and then are discharged out of the crusher, unqualified coarse materials fall into the rotor working area, the transmission device drives the rotor to rotate to hit the materials onto the impact plate to be subjected to impact crushing, and therefore the materials with qualified particle sizes are obtained. The particle size difference rate of output materials is reduced, the fine powder amount of finished product granules is reduced, the uniformity rate of the materials with the finished product particle size is improved, the beating frequency is reduced, and the efficiency is improved.

The invention relates to the field of a spray dryer and discloses a nozzle for a spray dryer and a spray dryer with the nozzle. The nozzle comprises a nozzle main body which is provided with a nozzle head for injecting a material to form droplets, a material inlet communicated with the nozzle head and a material cavity connecting the nozzle head and the material inlet, and a protective air guide pipe which is provided with a protective air distribution port and a protective air injection port communicated with the protective air distribution port and is provided around the nozzle main body so that the protective air injected by the protective air injection port surrounds the droplet-like material ejected from a material injection port of the nozzle head. The nozzle can reduce the problem that fine powder is generated by fast heating-caused bursting of the microspheres during the spray drying process, realizes concentrated particle size distribution, reduces production of special-shaped particles and improves the sphericity of the finished particles.

The invention belongs to the technical field of polyacrylamide, and particularly relates to a synthesis method of anti-degradation cationic polyacrylamide, which comprises the following steps: adding an inorganic salt auxiliary agent, acrylamide and acryloyloxyethyl trimethyl ammonium chloride into deionized water according to the mass percent of dry substances, dissolving and mixing to obtain a material solution with a certain mass concentration; and pumping the solution into a polymerization kettle, introducing nitrogen for 40 minutes; then adding a composite initiator, continuing introducing nitrogen for 3 minutes, thickening the feed liquid; then carrying out pressure building polymerization for 3 hours, and carrying out granulation, drying, grinding and other processes on the colloid to obtain a particle product, namely the anti-degradation cationic polyacrylamide. A composite initiation system and free radical aqueous solution polymerization are adopted, so that the viscosity and charge binding force of the product are improved, and the degradation resistance of the product is improved; the product yield is improved, the yield and the quality are improved, the production cost and the use cost are reduced, and the cost performance is higher.

The invention discloses a clopidogrel hydrogen sulfate tablet as well as a preparation method and use thereof. The clopidogrel hydrogen sulfate tablet is prepared from the following raw materials in parts by weight: 90 to 100 parts of clopidogrel hydrogen sulfate, 100 to 200 parts of filling agent, 5 to 30 parts of disintegrating agent, 5 to 30 parts of polyethylene glycol, and 5 to 30 parts of anti-sticking agent. The preparation method comprises the following steps: S1: preparing a polyethylene glycol solution; S2: uniformly mixing the clopidogrel hydrogen sulfate, the filling agent and thedisintegrating agent, adding the polyethylene glycol solution, preparing a soft material, then granulating, drying, and shaping; S3: adding the anti-sticking agent, mixing, tabletting, coating, thus obtaining the clopidogrel hydrogen sulfate tablet. The use of the clopidogrel hydrogen sulfate tablet can prevent and treat cerebral-cardio diseases and other artery circulatory disturbance diseases caused by the high clustering degree of blood platelets. The clopidogrel hydrogen sulfate tablet and the preparation method thereof have the advantages that the sticking in the tabletting process and the slow disintegration of the tablet can be effectively reduced, the tabletting process is ensured to be smooth, a main drug is ensured to dissolve out rapidly, and the bioavailability of the drug canbe improved.

A kind of preparation method of olefin polymerization catalyst solid component, comprises in the presence of halide methane, make C 2 -C 8 Alcohol and magnesium powder react at 20-200°C at a molar ratio of 2.0-4.0:1 to form a uniform magnesium complex solution, then add an electron donor compound to form a uniform solution, and then contact this solution with a titanium compound to form The Mg-Ti complex solution is used to fully contact and react with the inorganic oxide carrier to obtain a solid catalyst precursor, and then the precursor is activated with an alkylaluminum halide to obtain a solid catalyst. The solid component of the catalyst prepared by the method of the invention is used in the polymerization of ethylene in combination with the alkylaluminum, has high catalytic activity, and the amount of fine polymer powder produced is very small.

The invention relates to polyvinyl chloride and a manufacturing method thereof. The manufacturing method comprises a prepolymerization reaction and a main polymerization reaction. The prepolymerized particles generated by the prepolymerization reaction and the main polymerized particles generated by the main polymerization reaction are bonded with each other to form polyvinyl chloride particles. The surface modifier which is added in the prepolymerization reaction and / or the main polymerization reaction and has a specific hydrophilic-lipophilic balance value is beneficial to bonding of the prepolymerization particles and the main polymerization particles, so that the surface roughness of the polyvinyl chloride particles is reduced, and the amount of fine powder generated by friction between the polyvinyl chloride particles is reduced; under the condition that the oil absorption amount of the polyvinyl chloride particles is not changed, the apparent specific gravity of the polyvinyl chloride particles is improved.

The invention belongs to the field of metallurgy and relates to a method for preparing sigma-phase FeV50. The technical problem to the solved of the invention is to provide a method for preparing the sigma-phase FeV50 which has good apparent mass and is easy to break. In the adopted technical scheme, the sigma-phase FeV50 is obtained by uniformly mixing vanadium oxide, aluminum, iron and lime serving as raw materials, feeding the mixture into a furnace and smelting the mixture in an electric arc furnace by an electro-aluminothermic process. The method comprises the following steps of: a, adding excess aluminum into the raw materials while proportioning so as to reduce the vanadium oxide, melting a furnace charge down, depleting slag until vanadium content is low and removing lean slag; and b, adding an appropriate amount of vanadium oxide into alloy liquor from which the slag is removed to remove the excess aluminum, discharging and casting when the temperature and aluminum content ofthe alloy liquor meet requirements and cooling so as to obtain a product, namely, the sigma-phase FeV50. The crush strength of the sigma-phase FeV50 produced by the process is less than 510 MPa and convenience can be brought to vanadium iron manufacturers and customers in the crushing, sampling and using processes of vanadium iron.

The invention provides polymer latex agglomerated particles and a preparation method thereof. The method comprises the following steps: S1, preparing first latex with a core-first polymer shell structure; S2, adding a polymeric monomer into the first latex for a reaction, and obtaining second latex of a core-first polymer shell-second polymer shell structure, wherein the glass transition temperature of a second polymer is 5-20 DEG C lower than that of the first polymer; and S3, condensing the second latex, curing, and dehydrating to obtain polymer latex agglomerated particles. By applying the method, on the premise of not changing coagulation conditions, the curing forming rate of polymer particles is increased, the particle size of powder is increased, the micro powder amount in the powder is reduced, and the operation stability of a dehydration and drying system is improved.

A solid catalyst component for preparing alpha-olefin homopolymer or copolymer with high catalytic activity is prepared through reacting between C2-C4 alcohol and Mg powder under existance of halomethane to obtain Mg matches solution, reacting on inorganic carrier, drying to obtain Mg carrier, and reacting on Ti(OR)nCl4-n in inertial hydrocarbon solvent, where R is C2-C8 alkyl and n=0-4.

The invention discloses a light-weight anion foamed ceramic. The light-weight anion foamed ceramic with a double-layer structure is formed by using basic foaming powder and anion foaming powder; correspondingly, the invention also discloses a kind of the above-mentioned A method for preparing lightweight negative ion foamed ceramics; the invention effectively improves the utilization efficiency of negative ion materials and reduces the usage amount of negative ion materials by setting layered design and adding negative ion materials only in the surface layer. At the same time, through the combination of formula structure and preparation process, a foamed ceramic with fine and uniform pore size and high strength is prepared.

The present invention relates to a multi-zone reactor suitable for the continuous fluidized bed polymerization of one or more alpha-olefin monomers, at least one of which is ethylene or propylene, which multi-zone reactor can be used in Operating in condensation mode, the multi-section reactor includes a first section, a second section, a third section, a fourth section and a distribution plate, wherein the first section and the second section separated by the distribution plate, wherein the multi-zone reactor extends vertically, wherein the second zone of the multi-zone reactor is located above the first zone, and wherein the said third section of said multi-zone reactor is located above said second section, and wherein said fourth section of said multi-zone reactor is located above said third section, wherein The second section comprises an inner wall, wherein at least a portion of the inner wall of the second section is in the form of a progressively increasing inner diameter or a continuously open cone, wherein the diameter or the opening is directed towards the A vertically increasing top of a multi-zone reactor, wherein the third zone comprises an inner wall, wherein at least a portion of the inner wall of the third zone is in the form of a progressively increasing inner diameter or a continuous open cone body, wherein said diameter or said opening increases vertically towards the top of said multi-zone reactor, wherein said inner wall of said third zone has a maximum diameter greater than that of said second zone The maximum diameter of the inner wall.