700 results about "Porous microspheres" patented technology

The improved process for preparing high strength porous microsphere active carbon includes the following steps: oxidizing thermosetting resin ball at 60-400 deg.c in oxygen containing atmosphere or pre-treating thermosetting resin ball at 60-300 deg.c in oxidizing acid, SO2 or SO3; carbonizing at 600-1200 deg.c in helium, nitrogen or their mixture atmosphere; and activating at 600-1200 deg.c in activating water vapor atmosphere to obtain high strength porous microsphere active carbon with grain size of 10 micron to 2 mm, BET specific surface area of 500-4000 sq m/g, and grain strength of 50-200 MPa. The process is simple, low in cost and high in yield, and the prepared microsphere active carbon has high strength and high purity and is one excellent medical active adsorption material.

A preparation method for porous microspheres of a biodegradable polymer is provided. The method comprises the following steps: (a) dissolving a biodegradable polymer in an organic solvent to form an oil phase of 1-30% (g/ml) concentration; (b) selecting a pore-forming agent 1-50% of the biodegradable polymer in the step (a) and dissolving the pore-forming agent in water to form an internal water phase; (c) adding dropwise the internal water phase into the oil phase at a volume ratio of (1-30):100, and stirring to form a primary emulsion; (d) preparing a polyvinyl alcohol aqueous solution of 0.5-10% (g/ml) concentration, which serves as an external water phase; (e) pouring the primary emulsion into the external water phase at a volume ratio of (3-30):100, stirring or performing ultrasonic treatment to form a double-emulsion, and allowing the polymer in the double-emulsion to solidify, thereby forming microspheres; (f) freeze-drying the microspheres to obtain the final product. The obtained porous microspheres of the biodegradable polymer have high porosity, large specific surface area and good adsorption and encapsulation properties; and are used for the adsorption and encapsulation of unstable protein drugs, polypeptide drugs and growth factors and can retain pharmaceutical activity and effectiveness thereof.

The invention discloses a preparation method of an alumina porous microsphere. The preparation method comprises the following steps: 1) dissolving a surfactant in deionized water, stirring the solution, and using the solution as a water phase; 2) mixing a chelating agent, an alumina precursor and octanol, stirring the materials, and using the mixture as an oil phase; 3) adding Span80 and a pore-forming agent to the oil phase, and stirring the materials; 4) pouring the clear oil phase obtained in the step 3) into the water phase, and continuously stirring and emulsifying the materials; 5) carrying out vacuum filtration on the product obtained in the step 4), and washing and then drying the obtained filter cake, thus obtaining the alumina porous microsphere. The microsphere has an internally closed macroporous structure and has a microsphere dimension of 1-100mu m and an internally closed pore diameter of 50nm-5mu m.

The invention discloses a chitosan/layered silicate nano composite porous crosslinked microsphere adsorbent and a preparation method thereof; in the adsorbent, the layered silicate which is in nano-state is dispersed in the chitosan microsphere which is treated with chemical crosslinking. The preparation method is as follows: the chitosan with low molecular weight/ layered silicate intercalation solution is prepared, the intercalation solution is blended with the chitosan with high molecular weight and is contacted with alkaline coagulant to prepare the microsphere, the microsphere is treated with pre-crosslinking and crosslinking, acid solution is used for removing pre-crosslinking agent to obtain the chitosan/layered silicate nano composite porous crosslinked microsphere adsorbent. By comprehensively utilizing the characters of chitosan and layered silicate in terms of adsorption property and jointly applying intercalation composition, solidification and granulation by alkali solution, and pre-crosslinking and crosslinking techniques, a porous microsphere adsorbent which has low price and excellent adsorption performance for heavy metal ions and organic pollutants can be prepared.

The invention discloses a porous carbon microsphere with the surface covered with graphene, and a preparing method and application of the porous carbon microsphere. The polymer porous microsphere with the surface provided with the amination perssad serves as a template, the polymer microsphere is fully soaked in a sulfonation graphene water solution and dried, the sulfonation graphene and the polymer microsphere are combined, the polymer porous microsphere with the surface covered with sulfonation graphene is obtained and is carbonized at a high temperature in the protective atmosphere, and a target product, namely the porous carbon microsphere with the surface covered with graphene is obtained. The diameter of the target product is in the controllable range of 5 nm to 1,000 microns, a porous structure is achieved, the aperture is in the controllable range of 5 nm to 100 nm, a very large specific area is achieved, a very high electron transfer rate and good electrical conductivity are presented, the porous carbon microsphere can be widely applied to many fields such as catalyst loads, lithium ion batteries, supercapacitors, adsorption, sea water desalination and sensing, the preparing technology is simple, controllability of the reaction process is high, and industrial large-scale production is facilitated.

The invention relates to the field of high-molecular porous materials and particularly relates to a preparation method of porous chitosan-based microspheres for medicine carriers, adsorption and separation, hemostasis and wound dressing. The preparation method comprises the following steps: (a) respectively preparing solidification liquid, an emsulsifying-agent solution and a diluted-acid solution of pelletizing materials and precooling the solidification solution to minus 20 DEG C; (b) dripping the chitosan diluted-acid solution into the emsulsifying-agent solution, homogenizing and stirring to form emulsion; and (c) carrying out thermally-induced phase separation on the emulsion under the temperature ranging from minus 60 DEG C to minus 10 DEG C, adding precooled solidification liquid, carrying out reverse-phase regeneration and thus obtaining the chitosan-based porous microspheres. The preparation method has the beneficial effect that the surfaces and the inner parts of the porous microspheres have porous structures with communicated heights.

The invention provides a preparation method of composite porous microspheres of a core-shell structure. The method comprises the following steps that a shell material solution, oil-phase dispersion liquid of porous microspheres and an oil-phase solution containing an emulsifying agent are prepared separately; the shell material solution is added into the oil-phase solution containing the emulsifying agent and mixed, and a water-in-oil emulsion is obtained; the oil-phase dispersion liquid of the porous microspheres is added into the water-in-oil emulsion, stirring is conducted, and the porous microspheres coated with shell materials are collected. Compared with the prior art, the preparation method of the composite porous microspheres of the core-shell structure has the advantages that the composite porous microspheres are good in dispersity and free of gathering agglomeration; the preparation technology is simple; the microspheres each has the structure with a dense shell layer and a porous kernel, and improvement of drug-loading capacity and slow release of a drug are facilitated.

The invention discloses a method for synthesizing a porous microsphere material containing NaY zeolite by a waste FCC (fluid catalytic cracking) catalyst, which is a catalytic cracking process. The method is characterized by comprising the following steps: A. adding water and hydrochloric acid to the waste FCC catalyst for mixing slurry and acidizing to obtain catalyst microspheres; B. mixing thecatalyst microspheres with one or a combination of natural kaolin and roasted kaolin, adding water to obtain slurry containing 30-50% of solid, adding a functional agent to the slurry and then forming dried microspheres through spray drying, and roasting the dried microspheres at the temperature of 700-1100 DEG C for 0.5-10 hours to obtain roasted microspheres; and C. adding sodium silicate, a zeolite directing agent and alkali liquor to the catalyst microspheres and/or the roasted microspheres, adding the obtained mixed solution to a crystallization reaction kettle, performing hydrothermal crystallization at the temperature of 85-120 DEG C for 10-30 hours, filtering out a mother liquid, washing the obtained filter cake with deionized water, and then drying to finally obtain the finished product. The method is mainly used for synthesizing the porous microsphere material containing the NaY zeolite.

The invention discloses a method for preparing polymer porous microspheres through mixed phase separation. The method comprises the following steps: 1), dissolving a polymer and an additive into a solvent, and heating and stirring until the polymer and the additive are completely dissolved to form a transparent solution; 2), injecting a high-temperature polymer solution into a low-temperature non-solvent such as ice water or water and the like by using a syringe needle and inducing thermally induced phase separation and non-solvent induced separation to form pores; and 3), washing, drying and the like to obtain the polymer porous microspheres. The characteristics that the thermally induced phase separation is easy to control, pore-forming rate is high and the non-solvent induced separation has high applicability are exerted; the preparation method is simple, high in efficiency and low in cost; and the invention provides the method for preparing the polymer porous microspheres with various pore structures and high porosity. The preparation method has a huge application prospect in the aspects of gas separation, water treatment, biological active substances, catalyst carriers and the like.

A method for manufacturing of an improved attrition resistant catalyst having an oxide-rich surface layer involving forming an aqueous slurry comprising; catalyst, catalyst precursor or catalyst support particles (e.g., vanadium/phosphorus oxide, V/P/O catalyst), a large particle colloidal oxide sol (e.g., 200 Å, 600 Å, 750 Å colloidal silica, sodium stabilized) as the major oxide-rich surface layer forming component, and a second oxide-rich surface layer forming component solution wherein the solute is selected from the group consisting essentially of a precursor of the oxide-rich surface with average particle size no greater than 5 nm (e.g., aqueous silicic acid or polysilicic acid), a colloidal oxide sol wherein oxide particles in the sol have an average size below 10 nm (e.g., 50 Å colloidal silica), and mixtures thereof and then spray drying the slurry to form porous microspheres of attrition resistant catalyst; and, calcining/activating the spray dried microspheres. Such a catalyst is particularly useful and exhibits improved performance in oxidation processes such as the catalytic air oxidation of butane to maleic anhydride.

The present invention relates to a nano titanium dioxide porous microsphere, and is characterized by that its main component is nano titanium dioxide of anatase phase, grain size is 60-mesh to 180-mesh, its micropore pore size is 20 nano to 80 nano, its specific surface area is 80 sq.m/g to 140 se.m/g, and its preparation method includes the following steps: mixing nano titanium dioxide powder and nano titanium dioxide colloid, grinding to obtain its mixed pulp material, spray-pelleting, heat-treatment so as to obtain the nano titanium dioxide porous microsphere. Said invented porous microsphere is a high-effective light-catalyst.

The invention relates to a method for preparing magnetic porous polystyrene microspheres on the basis of suspension polymerization, belonging to the technical field of preparation of environmental functional materials. The method comprises the following steps: synthesizing Fe3O4 magnetic particles by a solvothermal process; and preparing magnetic porous polystyrene microspheres by suspension polymerization by using styrene and divinylbenzene as functional monomers, azodiisobutyronitrile as an initiator and toluene and cyclohexanol as pore-forming agents. The obtained microspheres have abundant pores on the surface, thereby being beneficial to enhancing adsorbability; and the Fe3O4 magnetic particles inside the microspheres have magnetic stability, and can be quickly separated under the action of an external magnetic field. The adsorbent is used in a water environment for selectively adsorbing 2,4-dichlorophenol and 2,6-dichlorophenol. The static adsorption experiment result indicates that the magnetic porous microspheres prepared by the method have the advantages of favorable adsorption capacity, quick adsorption kinetic property and favorable regenerability.

The invention discloses a magnetic porous supported metallic chiral catalyst and an application thereof. The support of the catalyst is an amino-modified magnetic porous microsphere, and a preparation method of the amino-modified magnetic porous microsphere comprises the following steps: heating iron chloride in an aqueous solution comprising sodium citrate, urea and polyacrylamide for carrying out a hydrothermal reaction to prepare a ferriferrous oxide nanosphere, preparing a magnetic porous microsphere through a sol-gel process by using the ferriferrous oxide nanosphere as a magnetic core and tetrahexyl orthosilicate as a silicon source and adding a template cetyltrimethylammonium bromide, and carrying out a silane coupling reaction of the magnetic porous microsphere and 3-aminopropyltriethoxysilane to prepare the amino-modified magnetic porous microsphere. The catalyst provided by the invention is magnetic, allows reaction products to be easily separated through applying a magnetic field, and can be recycled several times, so the catalyst loss is reduced. The catalyst has a high catalytic efficiency, allows the e.e. values of the products to be high, and still has a very good catalytic capability in the repeated use.

The invention relates to a method for preparing a sustained-release fertilizer, and belongs to a method for preparing the sustained-release fertilizer by embedding a fertilizer into the pores of a carrier, in particular a method for preparing the sustained-release fertilizer by embedding the fertilizer into the pores of porous microspheres puffed by mountain flour in a larger amount than that in the prior art. The method comprises the following steps of: putting the porous microspheres puffed by the mountain flour in a vacuum container which is vacuumized; stopping vacuumizing after the air in the pores of the porous microspheres puffed by the mountain flour is pumped out completely; pouring the fertilizer into the vacuum container; uniformly mixing the porous microspheres puffed by the mountain flour and the fertilizer; gradually reducing the vacuum to normal pressure to ensure that the fertilizer is absorbed into the pores of the porous microspheres puffed by the mountain flour as much as possible; and thus, obtaining a sustained-release fertilizer primary product. Compared with the method of simply mixing the porous microspheres puffed by the mountain flour and the fertilizer, the method not only increases the vacuumization process and the cost, but prolongs the utilizable time of the fertilizer in the soil, increases the utilization rate of the fertilizer and reduces the fertilizer pollution.

The invention discloses skin filler used for injection and a preparing method and application thereof.The skin filler used for injection is composed of sodium carboxymethylcellulose, mannitol and hydrophilic modified polylactic acid microspheres loading an antioxidant factor.Sodium carboxymethylcellulose, mannitol and hydrophilic modified polylactic acid microspheres loading the antioxidant factor are adopted to form the skin filler used for injection, wherein a polyethylene glycol-polylactic acid-hydroxyacetic acid segmented copolymer is adopted as a raw material of the hydrophilic modified polylactic acid microspheres loading the antioxidant factor, the material is good in biocompatibility and moderate in degradation time, and no residue exists in the human body; the preparing method of the skin filler used for injection is easy to operate and facilitates industrial production, activity of the antioxidant factor can be reserved by the process, and by the adoption of the freeze-drying process, the porous microspheres which are high in dissolution speed, uniform in morphology, high in encapsulation efficiency and stable in slow release can be prepared and used for meeting structural design requirements and clinical needs.

The invention relates to anion resin for bilirubin absorption and a preparation method thereof. According to the invention, in the anion resin for bilirubin absorption, styrene is adopted as monomers, divinyl benzene is adopted as a cross-linking agent, maleic anhydride copolymer microspheres and organic small molecules are adopted as a pore-forming agent, and oil dispersible hyperoxide is adopted as an initiating agent; porous microspheres are prepared through suspension polymerization; and the anion resin with preferential bilirubin adsorption ability is obtained through quaternary ammoniation treatment, wherein the theoretical crosslinking degree of the resin is 4-20%, the average pore size of total pores is 80-120nm, and functional groups are quaternary ammonium salt groups. Accordingto the invention, the anion resin with uniform pore sizes, good permeability, good blood compatibility, high preferential adsorption of bilirubins, is obtained, and the problems in the prior art, such as poor absorption selectivity, high prices of imports, and the like, are solved.

The invention discloses a method for degrading organic matters in water by an activated persulfate coupling system, and is realized through the following steps: firstly, preparing TiO2 porous microspheres; then, preparing FeCo/TiO2; finally, fully mixing the FeCo/TiO2 with aqueous solution which contains organic matters, adding the persulfate, meanwhile, irradiating by ultraviolet rays, and activating to generate SO4<->. and.OH under the synergistic effect of the FeCo/TiO2 and ultraviolet light so as to degrade most parts of organic pollutants in wastewater. The method has a simple processing technology, the organic wastewater can be subjected to up-to-standard emission only through one-step reaction, cobalt ion and iron ion dissolution rates are extremely low, environment pollution is lightened, organic matter degradation efficiency in the wastewater is higher under acidic, neutral and alkaline conditions, and the stable treatment of the organic wastewater under a situation of various pH (Potential of Hydrogen) values is realized.