319 results about "Macroporus" patented technology

The present invention relates to nano mesoporous and mesoporous-macroporous biological glass produced and through surfactant self-assembling and sol-gel process under mild reaction condition and possessing excellent bioactivity. The new type of biological glass has controllable mesoporous structure, homogeneous and adjustable mesopore distribution, relatively great specific surface area and porosity, macropores with adjustable size and porosity, and controllable shape. The present invention may be used as bone repairing material, dental material and rack material in tissue engineering and for medicine embedding and controlling releasing, etc.

A macroreticular alumina carrier contains alumina and halogen and is prepared through mixing hydrated aluminium oxide with pore enlarging agent, shaping and calcining at 600-850 deg.C

The invention discloses a boron-containing nano-mesoporous and macroporous bioactive glass, a preparation method thereof and the application thereof to medical supports. The boron-containing mesoporous bioactive glass is prepared by substituting BO33- for part of SiO44- by a sol-gel method. According to the method, controllable porosity (78 to 90 percent) is obtained by adjusting immersion times (2 to 5 times) and aperture (300 to 500 microns). The composite glass material has pores suitable for cell growth; tissue growth and nutrition transmission are facilitated due to the porosity characteristic; and the structural integrity of the supports can be maintained in vitro. When the boron content is 0 to 10 percent, the boron-containing ordered mesoporous bioactive glass support has large surface area of 365 to 194 m<2>/g and is suitable for serving as vectors of medicines and growth factors. The biological material can slowly release boron ions, can serve as a tissue repair material applied to bone and periodontium engineering, and can serve as vectors of medicines or genes.

Mesoporous and macroporous hydroconversion catalyst:

• • a predominantly calcined alumina oxide matrix;
  • a hydrogenating-dehydrogenating active phase with at least one VIB metal, optionally at least one VIII metal, optionally phosphorus,

said active phase being at least partly co-mixed in said predominantly calcined alumina oxide matrix.

Preparation process for a residue hydroconversion/hydrotreating catalyst by co-mixing of the active phase with a particular alumina.

Use of the catalyst in hydrotreating processes, in particular hydrotreating of heavy feedstocks.

The invention belongs to the technical field of membrane separation, and particularly relates to a forward osmosis composite membrane based on a two-dimensional nano material and a macroporous substrate and a preparation method and application of the forward osmosis composite membrane. According to the composite membrane, a two-dimensional nano material is deposited on the surface of a macroporoussubstrate to serve as a middle layer, a polyamide separation layer is formed on the surface of the middle layer, and the composite membrane is obtained. The two-dimensional nano material middle layerin the composite membrane prevents polyamide from permeating into the macroporous substrate to damage the original macroporous and mutually communicated pore structure, reduces the mass transfer resistance, and effectively relieves the internal concentration polarization phenomenon in the forward osmosis process, thereby greatly enhancing the separation performance of the polyamide composite membrane and prolonging the service life of the composite membrane. The forward osmosis composite membrane can be widely applied to seawater desalination, juice concentration and other fields.

The invention discloses a new method for preparing polycrystalline SrFeO3 with a three-dimensional ordered macroporous structure. The new method comprises the following steps of: dissolving strontium nitrate and iron nitrate in water according to the molar ratio of 1 to 1, adding citric acid to form complexing solution, and controlling metal ion concentration to be about 1.5mol/L, wherein an additive or a carbon source such as lysine, sugar or the like can be introduced into the solution; pouring a polymethyl methacrylate (PMMA) microsphere template into the solution, impregnating, performingsuction filtration and drying; placing the mixture into a tubular furnace; and heating to the temperature of 600 DEG C in a nitrogen atmosphere at the rate of 1 DEG C per minute, keeping the constanttemperature for 2 hours, switching to an air atmosphere after cooling to below 70 DEG C, heating to the temperature of 300 DEG C at the rate of 1 DEG C per minute, keeping the constant temperature for 1 hour, continuously heating to the temperature of 750 DEG C and keeping the constant temperature for 3 hours to obtain the perovskite type polycrystalline oxide SrFeO3 with the three-dimensional ordered macroporous structure. The prepared polycrystalline oxide SrFeO3 material with the three-dimensional ordered macroporous structure has the advantages of high crystallinity, cheap and readily available raw materials and high thermal stability of a product.

The invention discloses a method for preparing macropore strong acid cation exchange resin with a high specific surface area, and belongs to the field of the preparation for organic macromolecule compounds. The method comprises the following steps: copolymerizing styrene and a divinylbenzene monomer under the coexistence of porogen and a dispersion agent by taking low-carbon alcohol as the porogen, preparing a macropore copolymer white ball, performing macropore purification and high-temperature sulfonation to obtain the cation exchange resin. The crosslinking degree of the polymer white ball is increased by increasing the using amount of the divinylbenzene; the sulfonation temperature is increased at the same time; the specific surface area of the prepared cation exchange resin is large; the cation exchange speed is high; and the special requirement of a novel device such as a simulated mobile bed on the cation exchange resin can be met.

The invention provides a process for recovering a 7-ACA (aminocephalosporanic acid) product from mother liquor through macroporous adsorption resin. The process mainly comprises the following steps: performing resin adsorption, performing resin desorption, concentrating and the like, wherein in the resin absorption step, the pH value of 7-ACA crystallization mother liquor is adjusted, the crystallization mother liquor passes through a macroporous adsorption resin layer from top to bottom at a certain flow speed, and when the valence of 7-ACA contained in effluent of a resin column is 1% of that of the crystallization mother liquor at an inlet, resin adsorption is stopped. According to the method, the qualified 7-ACA product with the purity of greater than or equal to 98% and the color grade of greater than 4 can be obtained; the extraction yield of the resin is greater than or equal to 90% and the total process yield is greater than or equal to 40%; based on estimation of 200t of the mother liquor produced each day, the economic benefit of a year can reach more than ten million yuan.

The invention discloses a method for preparing high-purity nemadectin and belongs to the field of medicinal chemistry. The nemadectin is a sixteen-member macrolide type anthelmintic antibiotic and mainly used for synthesizing moxidectin with the better anthelmintic effect. According to the method for preparing the high-purity nemadectin, the nemadectin is extracted through an ethanol-water solution, and an extract is obtained, decolorized through ion exchange resin, deproteinized and desugared through macroporous adsorption resin and finally adsorbed and separated through the appropriate macroporous adsorption resin, so that nemadectin products with the purity higher than 90% can be prepared. The method is high in pertinency through matched usage of the resin, and the prepared high-purity nemadectin has great significance in synthesis of the high-purity moxidectin.

The invention belongs to the field of materials, and particularly relates to a mesoporous-macroporous multilevel ordered monodisperse micron sphere and a preparation method thereof. The method includes: using a nanoscale mesoporous molecular sieve obtained by means of hydrothermal synthesis as a multilevel structure construction unit, obtaining a silicon dioxide/urea resin composite micro sphere through the PICA (polymerization-induced colloid aggregation method), performing azeotropic dewatering, and removing urea resin through high-temperature calcinations to prepare the mesoporous-macroporous multilevel ordered monodisperse micron sphere. Dimension of the micron sphere can be adjusted by adjusting usage and proportion of urea and formaldehyde and the pH of solution. The multilevel ordered monodisperse micron sphere prepared by the method is uniform in size and has wide application to adsorption, separation and the like.

The invention discloses a tuckahoe extract which is prepared through ethanol extraction and macroporous absorption resin purification. The tuckahoe extract enriches more effective parts. Moreover, a rat memory disorder model test proves that the tuckahoe extract can improve the learning and memory capacity of a model rat, so that the number of errors of the model rat is reduced and the latent period is prolonged.

The invention provides a method of preparing a three-dimensional nanofiber bracket by combining an immediately crosslinking technology and an electrostatic spinning technology. The bracket prepared according to the invention is of a three dimension solid structure, the thickness of the bracket is 0.05-10mm, the interfibrous gap is 0-30 microns, and the pore size is adjustable. With the adoption of the method, the operation is simple, the relevant immediately crosslinking method solves the problems that fibers are dissolved and the structure is damaged caused by crosslinking after natural biomolecules with poorer mechanical and processing performances carry out electrostatic spinning, so that the nanofiber bracket which has a stable structure, is in three dimension solid and is loose and porous can be obtained, and a platform used for carrying cells, cell factors and drugs is prod for tissue regeneration and repair.

The invention discloses macroporous alumina and a preparation method thereof. The macroporous alumina of the invention has the properties that the macroporous alumina is a gamma crystalline state, thetotal porosity is 60%-85%, the macropore diameter is 100 nm-1000 nm, the proportion of macropores to the total porosity is 40%-75%, the macropores are evenly distributed and three-dimensionally penetrated, a ratio of the wall thickness to the pore diameter of the macropores is 0.7-3.0, and the side crushing strength is 8-25 N/mm. The preparation method of the macroporous alumina includes the following steps: (1) preparing aluminum sol; (2) evenly mixing inorganic aluminum salts, polyethylene glycol, the aluminum sol obtained in the step (1), organic compounds containing amide groups and a low-carbon alcohol aqueous solution; (3) adding epoxypropane and/or pyridine into the mixture obtained in the step (2), evenly mixing the mixture to obtain gel, and carrying out aging to obtain an agingproduct; and (4) immersing the aging product by using the low-carbon alcohol aqueous solution, carrying out solid-liquid separation, and drying and roasting a solid phase to obtain the macroporous alumina.

The invention belongs to the technical field of biochemical industry and relates to a preparation method of a macroporous strong-acid cation-exchange resin catalyst and the use thereof in the catalytic synthesis of methyl 2-keto-L-gulonate. The preparation method is characterized by comprising the following steps in turn: 1), suspending and polymerizing phenylethylene and polystyrene monomers at 60 to 95 DEG C in the presence of a dispersion system, an initiator and a mixed pore-forming agent to obtain copolymer white balls with a macroporous structure; 2) washing the copolymer white balls with low-boiling point solvent; and 3) sulfonating according to a preparation method of a sulfonie acid cation resin to obtain the macroporous strong-acid cation-exchange resin catalyst. The preparation method has the advantage that an alkyl phthalate is mixed with liquid paraffin or paraffin to form the mixed pore-forming agent and then the strong-acid resin having a macroporous structure is formed. The use of the product in the catalytic synthesis of methyl 2-keto-L-gulonate shows that the quality of the product is much higher than that of commercial macroporous and gel strong acid resins currently available on markets, and that the continuous operation stability and the pollution resistance of the product are high.