147results about How to "Low fines content" patented technology

The invention provides a preparation method of a catalyst component for olefin polymerization. In the preparation method of the catalyst component, a separation assistant component consists of polyol ester compounds expressed by a general formula (I) and organosilane compounds expressed by the general formula (II) of RIaRIIbSi (ORIII) c; and the separation process of catalyst particles is effectively controlled through combining action of the organosilane compounds and the polyol ester compounds. Compared with the traditional catalyst, the catalyst has greatly improved activity and yield and has little polymer fine powder.

The invention relates to a preparation method of a catalyst component for ethylene polymerization or copolymerization and a catalyst thereof. The method comprises the following steps: (1) at a temperature of 50-90DEG, dissolving magnesium halide in a solvent system containing an organic epoxy compound and an organic phosphorus compound to form a uniform solution; adding an organic alcohol compound during or after the solution formation and leaving them to react for certain time so as to obtain a reaction solution; (2) in the presence of an organic titanium compound and at a temperature of -30DEG C-0DEG C, subjecting the solution and a titanium compound to a contact reaction, or adding the organic titanium compound after the contact reaction of the solution obtained in step (1) and the titanium compound, and raising the temperature of the mixture slowly to 50-120DEG C, leaving solids to precipitate gradually and form particles, after certain period of reaction, removing the unreacted material and the solvent, and conducting washing with an inert diluent so as to obtain a solid component; and (3) suspending the solid component in certain amount of the inert diluent, performing a contact reaction with an organic aluminium compound under a temperature of 0DEG C-50DEG C, and after certain reaction time, removing the inert diluent, thus obtaining the catalyst component. The catalyst provided in the invention has high catalytic activity and good hydrogen response.

Propylene polymerization or copolymerization and its polymer are disclosed. The process contains tree stage polymerization and is carried out by propylene pre-polymerizing at 2-1000g polymer/1g catalyst, polymerizing at 50-90 degree and polymerizing at 95-150 degree in proportion of 0.3-3. It has excellent particular appearance and its bending modulus is >1.7Gpa and bending strength is >40MPa.

The invention relates to a chromium-polyethylene catalyst, and belongs to the technical field of polyethylene catalysts. The chromium-polyethylene catalyst is composed of chromium salt, an inorganic metal oxide support and a promoter. A preparation method for the chromium-polyethylene catalyst comprises the following steps of: preparing the chromium salt into solution; mixing the solution with the inorganic metal oxide support; and sequentially pre-drying, as well as drying, roasting and reducing in an inert gas environment to prepare the chromium-polyethylene catalyst. According to the preparation method disclosed by the invention, a novel chromium-polyethylene catalyst higher in polymerization activity and strength than the traditional chromium-polyethylene catalyst is prepared by adjusting the ratio of the mass of the inorganic metal oxide support to the volume of the solvent during a catalyst soaking process; and the resin prepared form the catalyst is improved in particle strength and reduced in fine powder content.

The invention discloses a catalyst component used for an ethylene polymerization reaction, a preparation method thereof and a catalyst prepared therefrom. The catalyst component comprises a magnesium alcohol adduct, a titanium compound, acrylate and a derivative thereof, an organic aluminum compound, a monoester compound and a free radical initiator. The catalyst is high in mechanical strength and hydrogen regulation sensitivity and is not liable to break during polymerization. A prepared polyethylene powder material is high in stacking density, is very concentrated in particle size distribution and is less in contents of thick powder and fine powder.

The invention discloses a polypropylene catalyst spherical carrier and a solid catalyst and a preparation method thereof. The preparation method comprises the following steps: carrying out a heating reaction between a magnesium chloride alcohol compound formed by complexing magnesium chloride and alcohol and fumed silica in a dispersing medium, and forming uniform slurry containing the magnesium chloride alcohol compound; dispersing the slurry in an inert dispersing medium under the high shearing action, introducing the slurry into a low-temperature inert dispersing medium, and carrying out freeze curing to form the spherical particle carrier containing the magnesium chloride alcohol compound. A solid catalyst prepared by adopting the carrier is used for olefin polymerization, namely propylene polymerization, and has relatively high polymerization activity, relatively low fine powder content and good polymer particle form.

The invention provides a catalyst component for ethylene polymerization, which is prepared by a method comprising the following steps of: (1) reacting an alkoxy titanium compound (a) with a magnesium compound (b) to form a solution; (2) adding a porous inorganic oxide (d) and halogenated alkyl aluminum (e) to the solution prepared in the step (1) to separate out sediment; and (3) reacting a liquid titanium compound (h) with the sediment obtained in the step (2) to obtain a titanium-included solid catalyst component. The halogenated alkyl aluminum (e) can be one or more than one of organic aluminum compounds with the general formula of AlRnX3-n, wherein R represents alkyl, aralkyl and aryl with 1-20 hydrogen or carbon atoms, X represents halogen, and n represents an integer which is not less than 0 and not more than 3. The preparation method of the catalyst is simple and has low cost; and when applied to ethylene polymerization, the catalyst has higher activity, and the obtained ethylene polymers have centralized particle size distribution and less content of fine powder.

An olefin polymerization catalyst, its production and use are disclosed. The procedure is carried out by reacting magnesium compound with alcohol compound to form mono-magnesium composite, immersing it into carrier silica with halogenating agent, reacting it with titanium compound to obtain final product. It has better catalyst activity and wider polymer molecular weight distribution. It can be used for vinyl homopolymerization and copolymerization.

The present invention relates to a method for preparing a titanium catalyst component, comprising the steps: reacting a magnesium halide in a solvent including an alcohol to obtain a homogeneous solution, reacting at least one organic boron compound with the homogeneous solution, reacting a titanium compound with the homogeneous solution, a titanium catalyst component obtainable by said method, a method for preparing a titanium catalyst and a titanium catalyst obtainable by said method.

The invention provides a preparation method for an olefin polymerization catalyst component. The preparation method comprises the steps: contacting a magnesium compound, an organophosphorus compound, a pyrrolidone compound and an organic epoxy compound in a solvent to form a uniform solution; in the presence of a precipitation aiding agent, contacting the uniform solution with a titanium compound to obtain a mixture; and then contacting the obtained mixture with an internal electron donor compound, and carrying out a reaction to obtain the olefin polymerization catalyst component, wherein at least one of the magnesium compound and the titanium compound is a halogen-containing compound. According to the preparation method, the addition of the pyrrolidone compound and the organosilane compound can effectively shorten the preparation time of the catalyst component, improve the particle morphology of a catalyst and greatly reduce the fine powder content of the polymer; and at the same time, the catalyst activity is substantially improved, the apparent density of the polymer is relatively high, and the degree of isotacticity and the polymer melt flow index still maintain original relatively good performance of the catalyst.

The invention relates to a Ziegler-Natta catalyst component which comprises a Ti compound, MgCl2, silica gel, and alpha, omega-diether compound. The catalyst system has a relatively high catalytic activity when used for ethylene copolymerization, the obtained polyethylene is relatively narrow in molecular weight distribution, and polymer particles contain low fine powder.

The invention relates to a catalyst component for ethylene polymerization and a preparation method thereof. According to the preparation method, magnesium compounds are dissolved into a solvent system containing organic alcohol compounds and titanate compounds to form a magnesium composite, and then the magnesium composite is contacted with toluene and titanium compounds to carry out reactions so as to prepare the catalyst component. The catalyst component and a catalyst containing the catalyst component have the advantages of high catalytic activity, uniform particle diameter, and good particle shape and can be applied to ethylene polymerization reactions; and the obtained polyethylene resin has the advantages of wide molecular weight distribution, high resin stacking density, concentrated particle size distribution of PE powder, little fine powder content, and long production period, and can be advantageously used to produce small hollow resins in INNOVENES technology by adopting a single peak mode.

The invention relates to a catalyst used for ethylene polymerization. The catalyst comprises following ingredients, A, a titanium-containing solid catalyst ingredient, and B, an organic aluminium compound. The titanium-containing solid catalyst ingredient is prepared by following steps: magnesium halide is dissolved in an organic epoxy compound and an organic phosphorous compound; an electron donor compound is added so as to obtain a uniform solution; a silica compound and a precipitation accessory ingredient are added; and an obtained mixture is mixed with a halide or a derivative of titanium so as to obtain the titanium-containing solid catalyst ingredient; general formula of the organic aluminium compound is AlRX<3-n>, wherein R is used for representing alkyl with 1 to 20 hydrogen or carbon atoms, X is used for representing halogen atom, and n is an integer, 0

The invention relates to a gas phase polyethylene catalyst and a preparation method thereof. In the catalyst, anhydrous magnesium chloride and porous silica gel serve as a composite carrier, titanium-containing transition metal loaded on the composite carrier serves as an active component, an electron donor compound is added in the preparation process to serve as a modifier, and the electron donoris a silane compound with asymmetry. The problems that the common catalyst has low cavity, poor copolymerization ability and high product fine component content are solved, different silane electrondonor compounds are added in the preparation of the catalyst, polyethylene resin with different melt indexes is produced, in particular the gas phase polyethylene catalyst can be used for producing anethylene/1-hexene copolymerization new product with high additional value, so that the performance of the product is improved, the processibility of the resin is improved, and the application field of the product is widened.

The invention provides a catalyst component for olefin polymerization. The catalyst component comprises Ti, Mg, halogen, at least one electron donor compound and 1-99% of an olefin polymer. The catalyst component is used for olefin polymerization and has characteristics of high activity, high accumulation density and low fine-powder content. The catalyst component is free of ageing influences during room-temperature storage. Polymer particles are not liable to break. The catalyst component is especially suitable for synthesis of in-reactor alloying polymers with high rubber contents.

The invention discloses a production process system for producing multi-product machine-made sand. The production process system comprises a raw material bin, a machine-made sand vertical mill, a combined-type powder concentrator, a vibrating screen, a cyclone and a circulating fan, wherein the raw material bin, the machine-made sand vertical mill and the combined-type powder concentrator are connected in sequence, a bottom discharging port of the combined-type powder concentrator is connected with the vibrating screen, the vibrating screen returns oversize products to the machine-made sand vertical mill, an air outlet of the combined-type powder concentrator is connected with the cyclone, and an air outlet of the cyclone is connected with the circulating fan; and a plurality layers of screens with different pore sizes are arranged on the vibrating screen. The cone angle of each grinding roller of the machine-made sand vertical mill is not larger than 20 degrees, and the total projection area of the grinding rollers on a grinding disc accounts for 20-35% of the area of the grinding disc. A retention ring is a cut-through screening and retention assembly or a cross-type retention ring, auxiliary discharging assemblies arranged on the grinding disc and are located behind each grinding roller in the rotation direction of the grinding disc. By means of the process system, production of the multi-product machine-made sand can be achieved, and scale production is facilitated; and meanwhile, the effect of environmental protection is better, and ultraclean discharge can be achieved.

The invention relates to a moisture-retention dust suppression agent for coal and a preparation method of the moisture-retention dust suppression agent. The moisture-retention dust suppression agent comprises 800-1200 parts by weight of water, 1-3 parts by weight of alginic acid, 2-4 parts by weight of calcium lactate, 0.5-1.5 parts by weight of a dispersant, 400-600 parts by weight of soybean oiland 50-150 parts by weight of glycerol. The dust suppression agent for moisture retention of coal is water-in-oil emulsion; after the emulsion is sprayed, the effective components in the emulsion areadsorbed and complexed with pulverized coal, and fine pulverized coal prone to dust raising is bonded and agglomerated into non-raised dust particles with larger particle size, so that the content offine powder in upgraded coal is reduced, and the purpose of dust suppression is fundamentally achieved. By adding the moisture-retention dust suppression agent for coal in the transportation process,specific gravity is increased as compared with upgraded coal without the dust suppression agent under the condition of the same cargo compartment volume, so that the shortfall and road loss of upgraded coal in the transportation process are effectively reduced, and economic benefits of coal enterprises are increased.