227results about How to "Moderate pore size" patented technology

The invention relates to a porous metal organic framework material based on transition metal cobalt and a preparation method thereof. The metal organic framework material is a compound with supramolecular porous network structure and formed by self-assembly of metal ions and organic ligands through coordination complexation. The porous cobalt-based metal organic framework material contains one or more metal ions, and one or more organic ligands; and at least one of the metal ions is Co (II). The porous cobalt-based organic framework material has excellent selective adsorption on CH4 in a separation process of CH4 and N2; and the advantage of adsorption selectivity on CH4 is particularly evident under low pressure. The material is particularly suitable for development and recovery of oil field gas, coal bed methane and biogas.

The invention aims to provide a preparation method and application of a porous nano metal organic framework material, and is characterized in that the preparation method comprises the steps: adding a metal ion, an organic ligand, a surfactant and a nanocrystalline guide agent or a reagent forming the nanocrystalline guide agent into a growth medium, forming a framework structure through chemical complexation, crystallizing, filtering, washing, drying, and finally obtaining the porous nano metal organic framework material. The addition amount of the surfactant is 0-30% of the molar concentration of the metal ion; the metal ion is one or more of Cu<II>, Al<III>, Mg<II>, Fe<III>, Ni<II>, Co<II> and Zn<II>; the organic ligand has at least one atom independently selected from oxygen, sulfur and nitrogen and can be subjected to coordinated complexation to the metal ion through the atom. The method not only can effectively suppress the size of MOFs materials, but also easily improves size homogeneity and synthetic efficiency of the product.

The invention provides a production method for extracting sweet tea glucoside from sweet tea leaves. The method comprises the following process flows of: smashing a sweet tea crude drug; extracting a solvent; concentrating; precipitating with alcohol; purifying with macroporous resin; concentrating; carrying out chromatography with polyamide resin; concentrating; crystallizing and recrystallizing; drying; and obtaining a finished product. By using the method, a high-quality sweet tea glucoside product can be produced, and the method also has the advantages of reducing the material loss, shortening the production period, improving the product yield and reducing the production cost and is suitable for the industrial production; the purity of the sweet tea glucoside produced by utilizing the method is higher than 98 percent, so that the product purity is high, and the component is single; the color of the sweet tea glucoside is white and good; and meanwhile, the technical difficulty of industrially producing a high-content and high-quality sweet tea glucoside extractive is overcome, so that large-scale production is smoothly produced.

The invention discloses an SAPO molecular sieve, which has single crystals in sheet structure. The SAPO molecular sieve has moderate pore size, and can be used as a catalyst with long service life for olefin preparation from methanol. The invention also discloses a preparation method of the SAPO molecular sieve. The method us as below: activating a raw material of layered aluminosilicate, mixing the raw material with an phosphorus source and water, and homogenizing to obtain a wet masterbatch; drying and grinding the wet masterbatch to obtain a dry powder; and finally distilling the dry powder for crystallization, so as to obtain a raw powder for sheet SAPO molecular sieve. The method requires addition of a template agent, realizes low cost synthesis of SAPO molecular sieve and high additional value utilization of natural layered aluminosilicate, accelerates the rate of diffusion of various substances in the channels of the molecular sieve, increases the diffusion efficiency, and the advanategs of low equipment investment, simple operation and environment-friendliness.

The invention discloses a preparation method of biological active glass/chitosan composite porous support material, which adopts a perfusion method to compound chitosan and sol-gel biological glass porous support material prepared by a foam impregnation method. The invention comprises the steps of preparing pure biological active glass support material through the foam impregnation method, preparing chitosan solution and compounding biological active glass/chitosan composite support through the perfusion method, wherein the preparation of pure biological active glass support material through the foam impregnation method comprises preparation of size of the biological active glass, selection, impregnation and desiccation of polyurethane foam template.. During the preparation process of theinvention, shape, porosity and distribution of aperture are easy to be regulated and controlled. The prepared support material is provided with three-dimensional reticulate backbone structure, and themechanical intensity, biocompatibility and bioactivity thereof are excellent and degradable; the pressure strength thereof can achieve 1.15-1.30 MPa; apparent porosity can achieve 70%-80%. The support material is capable of meeting the requirements of providing support for defective parts of tissue. The invention has simple and practical method, thus being easy for large-scale production.

The invention discloses a method for synthesizing 2,5-dihydroxymethylfuran by selective hydrogenation of 5-hydroxymethylfurfural. The method is characterized in that a magnetic metal-organic coordination polymer is used as an acid and base bifunctional catalyst, low-price and easily-obtained low carbon alcohol is used as an in-situ hydrogen donor, and the 5-hydroxymethylfurfural is efficiently transformed into the 2,5-dihydroxymethylfuran by a selective transfer hydrogenation reaction under mild operation conditions and the maximum yield of the 2,5-dihydroxymethylfuran can be up to 98.6 percent. The magnetic metal organic coordination polymer used in the method disclosed by the invention has the advantages of relatively-high acid-base strength, more acid-base sites, relatively-large specific surface area and suitable pore size; in addition, the magnetic metal organic coordination polymer is simple in preparation process, is easy to separate and recover and shows excellent catalytic activity and catalytic stability. Furthermore, the low carbon alcohol is used as the in-situ hydrogen donor in the invention, so that the use of molecular hydrogen is avoided and the safety of the reaction process is improved; besides, the low carbon alcohol can be used as a reaction solvent and the introduction of exogenous substances is reduced, and thereby the production cost can be further reduced.

The invention relates to a novel spinel permeable and anti-clogging tundish upper nozzle and a production method thereof. An inner wall of the spinel permeable tundish upper nozzle is made of permeable spinel, an outer wall is made of a common alumina-carbon material, and a gas passage is provided between the inner wall and the outer wall and is communicated with a gas inlet hole at an upper surface of a base. A burning schedule is controlled to cause air porosity of a spinel liner formed at high pressure to meet argon blowing requirements and to cause the spinel liner to be subject to secondary forming with outer wall materials and an argon passage to be reserved. The permeable and anti-clogging tundish upper nozzle made by the method can meet the argon blowing requirements, and the spinel liner has functions of blowing argon, anti-clogging and resisting.

The invention relates to a polyolefin microporous membrane and a preparation method thereof. The polyolefin microporous membrane is composed of a modified superhigh molecular weight polyolefin master grain and high-density polyolefin, wherein the modified superhigh molecular weight polyolefin master grain is composed of the following components by weight percent: 40-70% of superhigh molecular weight polyethylene resins, 10-25% of modified resins, 15-25% of additives and 5-10% of lubricants. The quantity of crystal points of the polyolefin microporous membrane provided by the invention is reduced; the tensile strength is high; the homogeneity of product property is excellent; the method is simple in process; and the prepared polyolefin microporous membrane product has a suitable pore size,excellent ventilating property, a low-temperature disconnecting function and excellent mechanical property.

The invention discloses a catalyst for hydrogenation modification of coal tar and a preparation method thereof and the application thereof. The catalyst consists of a mixture of active components of WO3, NiO and P2O5 and a catalyst carrier, wherein the weight of WO3 is 27 to 30 percent of the total weight of the catalyst, the weight of NiO is 4 to 7 percent of the total weight of the catalyst, the weight of P2O5 is 2 to 3 percent of the total weight of the catalyst, and the balance being the catalyst carrier; the catalyst carrier consists of aluminum oxide and a ZSM-5 molecular sieve, of which the weight ratio is between 8-13:1; and the specific surface area of the catalyst is 210 to 230m/g, and the pore volume is 0.44 to 0.48ml/g. the catalyst has proper acid center, better water resistance and bigger specific surface, pore volume and pore size, and can reduce the carbon deposit and inactivation of the catalyst and the plugging of a bed. In the hydrogenation reaction, the proper acid center and active center can maximally make the arene saturated and ring opening under the condition of reducing the broken chain as far as possible, and the cetane number of the diesel oil component is increased, so that the catalyst possesses of good selectivity, stability and mechanical strength.

The invention provides a membrane casting solution, an ultrafiltration membrane and a preparation method of the ultrafiltration membrane. The membrane casting solution includes: polyamide; a pore-forming additive; and a solvent, the relative molecular mass of the polyamide is 200000-300000. As a result, the viscosity of the membrane casting solution is more appropriate, and the membrane casting solution has almost no bubbles, and is conducive to film formation.

The invention relates to a knitted multilayered-structure nanofiber yarn tendon scaffold as well as preparation and application thereof. Yarn is of a multilayered core spun structure. The preparationcomprises steps as follows: core layer yarn penetrates through a hollow rotating funnel to serve as a receiving device, positive and negative high-voltage power sources are applied to double needles on the two sides respectively, electrospun nanofibers are twisted to the core layer yarn, and double-layer continuous nanofiber yarn is prepared; the double-layer nanofiber yarn is taken as a core layer, electrospun natural polymer nanofibers are arranged on the outer layer, and three layers of nanofiber yarn are prepared; finally, the 3D knitted scaffold is prepared from the different layers of nanofiber yarn with a knitting technology and is used for tendon repair. The knitted multilayered-structure nanofiber yarn scaffold has the characteristics that a function of enhancing mechanical properties of regenerated tissue for a long time is realized, biocompatibility is good and repair and normal function recovery of tendon injury are facilitated.

The invention relates to a method for preparing microfiber hemostatic collagen sponge. The method comprises the following steps of: aggregating collagen molecules by the charge effect by adjusting pH, temperature and the salt concentration of collagen protein solution, freeze-drying the obtained and assembled collagen, then preparing into the collagen protein sponge, and then carrying out thermal crosslinking to obtain the microfiber hemostatic collagen sponge. The microfiber hemostatic collagen sponge prepared by adopting the method has uniform porous structure, good hydrophilic performance, high mechanical strength and degradation resistance and good hemostatic performance, and the defects that the traditional collagen sponge is easy in degradation, poor in mechanical property, easy in collapse in the application process and difficult in maintenance of the inherent form and the like are solved. The preparation method is simple and feasible, and is stable in process, and the prepared microfiber hemostatic collagen sponge can be widely applied in hemostasis and restoration of wounds of burns, traumas and surgical operation, and has good application prospect.

The invention relates to a mineralization guided tissue regeneration membrane and a preparation method and application thereof, wherein the mineralization guided tissue regeneration membrane comprises: a loose layer formed by compositing type I collagen and nano hydroxyapatite; a compact layer positioned on the loose layer and formed from type collagen. The double-layer mineralization guided tissue regeneration membrane is constructed herein, wherein the loose layer is consistent to autogenous bone in terms of composition, and the membrane may be attached to diseased oral bone defect surface to induce the generation of new bones; the surface of the compact layer is smooth, a diseased area may be isolated from surrounding tissues by making good use of physical barrier function of the membrane, regenerating capacity of a specific tissue is given to maximum play, and the prepared mineralization guided tissue regeneration membrane has high tensile strength and elasticity.

The invention discloses a catalyst for straight-run naphtha aromatization and a preparation method thereof. The catalyst for straight-run naphtha aromatization is prepared by modifying a nano ZSM-5 molecular sieve, preparing a carrier and preparing the catalyst. The catalyst is suitable for treating raw materials with high alkane content. And the catalyst has high catalytic activity and high arene selectivity. So the catalyst can be applied to more mild process conditions and can be applied to production of high-octane gasoline blending components and chemical raw materials like benzene, toluene, xylene, etc.

The present invention relates to an adsorbent for removing benzothiophene in diesel and a preparation method thereof. The adsorbent comprises an alkali modified sodium-type Y molecular sieve and an alkali modified sodium-type Y molecular sieve supported with yttrium oxide. The alkali modified sodium-type Y molecular sieve is obtained by treating a sodium-type Y molecular with a sodium hydroxide solution; and the alkali modified sodium-type Y molecular sieve is treated with a wet impregnation to obtain the adsorbent consisting of alkali modified sodium-type Y molecular sieve supported with yttrium oxide. Preparation equipment of the adsorbent is simple, and a preparation process is energy-saving and environment-friendly, without generating any harmful substance. The adsorbent can, in the presence of a large amount of aromatic hydrocarbons, selectively remove benzothiophene in diesel, and realizes desulfurization rate of 50-100% on diesel containing octane and benzothiophene, and with a sulfur content of 60-560mg / L, and desulphurization rate as high as 16% on diesel containing normal octane, benzothiophene and toluene, and with a sulfur content of 70-100mg / L; and when a mass fraction of toluene is not higher than 40%, the adsorbent containing the alkali modified sodium-type Y molecular sieve supported with yttrium oxide has a highest desulfurization rate reaching 32%.

The invention relates to a method for extracting low-pesticide-residue ginsenoside from ginsengs. The method comprises the following steps of leaching the ginsengs for 3-4 times in cold water, wherein each leaching lasts for 8-12 hours; combining leaching liquids, carrying out concentration, solvent extraction and concentration, enabling the leaching liquids to pass through a macroporous resin column, and flushing by utilizing water; carrying out ethanol elution, collecting the eluted liquid, and drying to obtain the low-pesticide-residue ginsenoside. The production method of the ginsenoside comprises two purification processes, the preliminary purification is extraction, and the resin is highly purified; partial impurities are removed in the extraction process, so that the high purification efficiency is improved.

The invention discloses a preparation method and an application of reduced graphene oxide. The reduced graphene oxide is prepared through an ionothermal technology. The method comprises the following steps: adding graphene oxide into an ionic liquid, carrying out ultrasonic dispersion to obtain an ionic liquid solution of graphene oxide, heating the solution to 150-220DEGC, reacting for 6-30h, cleaning, and freeze-drying to obtain the reduced graphene oxide. The preparation method has the advantages of simplicity, no pollution and high practicality degree, and the obtained reduced graphene oxide can be directly used as a super capacitor electrode material.

The invention discloses a dendrobium officinale planting substrate containing modified biochar, which comprises substrate A, substrate B and substrate C arranged sequentially from bottom to top; according to the ratio of parts by weight, substrate A is 10-20 parts of dry rice straw Or 10-20 parts of dry sugarcane leaves; substrate B is 5-20 parts of silkworm excrement, 10-30 parts of rice bran, etc.; 45 copies etc. The preparation method of the planting substrate is the preparation of modified biochar, the preparation of substrates A, B and C, and then superposition. The preparation method of the present invention is simple and easy to understand, and the planting substrate prepared by the present invention overcomes the long-term use of the substrate, rots and airtight, does not retain water, and has low cost and complete nutrition, which is more conducive to the growth of Dendrobium candidum, and promotes the growth of Dendrobium candidum Stronger and more developed root system.

The invention belongs to the field of pollution treatment and particularly relates to a phosphorous-removing double-metal organic framework material and a preparation method and application thereof. The double-metal organic framework material is prepared by using iron salt, zirconium salt and 2-aminoterephthalic acid as the raw materials and PVP as the auxiliary through a solvothermal method. Thedouble-metal organic framework material is excellent in phosphorous removing effect due to fact that Fe and Zr in the material and phosphate form Fe-O-P/Zr-O-P through ligand exchange, the amino in the material has a static adsorption effect on phosphate and surface or active sites have a chelating effect. The prepared double-metal organic framework material can still have an adsorption removing rate of 80% or above after being reused for 10 times and is excellent in regenerability and reusability and huge in practical application value.