51results about How to "Regular crystal form" patented technology

The invention belongs to the technical field of magnetic materials and in particular relates to a preparation method of nanosilver and sulfydryl jointly modified magnetic microspheres. The preparation method comprises the following steps of: 1) preparing Fe3O4 magnetic microspheres; 2) preparing SiO2 wrapped Fe3O4 magnetic microspheres; (3) preparing sulfydryl modified SiO2 wrapped Fe3O4 magnetic microspheres; and 4) preparing nanosilver and sulfydryl jointly modified SiO2 wrapped Fe3O4 magnetic microspheres. According to the method, nano Fe3O4 is wrapped by a silane coupling agent and the stability and the acid-base resistance are improved due to the safety and the stability of silica; and a functional sulfydryl group is introduced into the surface through chemical reaction, so that novel modified magnetic nanoparticles are obtained. Due to investment and development of biological technology industry, life science and diagnostic reagent industry, the development of biological magnetic bead products with the technological advantage and the cost performance advantage is greatly promoted.

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 invention relates to a preparation method of a small-grain SAPO-34 molecular sieve. The preparation method comprises the following steps: mixing an aluminum source and a phosphorus source with deionized water, stirring for 1-5 h, then adding a silicon source, an organic amine template agent R, an auxiliary template agent R' and an organic solvent A, continuously stirring for 1-5 h to obtain a gel, transferring the gel into a crystallization kettle, crystallizing for 12-108 h at the temperature of 160-220 DEG C to obtain a mixed liquor, filtering the mixed liquor to obtain a filter cake, washing the filter cake with deionized water, drying, and roasting to obtain an SAPO-34 molecular sieve. On the basis of using a conventional organic amine template agent, a small amount of auxiliary template agent R' and organic solvent A are added, and the cube-shaped SAPO-34 molecular sieve which is high in degree of crystallinity, regular in crystal form and 0.2 microns in grain size is successfully prepared through a hydrothermal crystallization method; moreover, the method is simple in procedures and easy to operate, the SAPO-34 molecular sieve has a great industrialization development prospect, and is expected to be used as a catalyst for preparing low-carbon olefinethrough methanol conversio and a catalyst for treating automobile exhaust.

The invention discloses a preparation method of spherical aluminum hypophosphite. In the method disclosed by the invention, sodium hypophosphite reacts with aluminum sulfate; meanwhile, melamine cyanurate is added as a seed crystal in the earlier stage of reaction, and different dispersants are added to improve the dispersion effect. The spherical aluminum hypophosphite prepared by the method disclosed by the invention has the characteristics of small particle size, regular crystal form and the like, thus the drop of mechanical properties of plastics after the addition of a flame retardant is reduced. Meanwhile, by adopting the melamine cyanurate seed crystal as a synergist in the flame retardant, the flame retardance effect of aluminum hypophosphite after plastic addition is remarkably improved.

The invention discloses a method for preparing gypsum whisker by using phosphate tailings and raffinate phosphoric acid. A technical scheme adopted in the invention is characterized in that the method comprises the following steps: taking a certain amount tailing powder with a certain particle size, adding a certain amount of distilled water to prepare a tailing slurry with a certain solid content, gradually adding raffinate phosphoric acid, reacting under certain conditions, filtering after the reaction, gradually adding a certain concentration of sulfuric acid into the obtained filtrate, reacting for a certain time, filtering, washing the obtained filter cake, and drying the washed filter cake in a drying box to obtain the gypsum whisker. The gypsum whisker is prepared through a two-step technology by using the raffinate phosphoric acid, the phosphate tailings and other phosphorus chemical industry enterprise waste resources as raw materials, and the growth form of the crystals of the gypsum whisker is controlled in the formation process of the phosphate crystals, so compared with traditional gypsum whisker preparation technologies, the method has the advantages of production cost reduction, solving of the environmental protection problem of the phosphorous chemical enterprises to a certain extent, and full use of magnesium resources in the raffinate phosphoric acid and the tailings.

The invention discloses a preparation method and application of large-particle-size spherical dialkylphosphinate. Preparation methods and application of present dialkylphosphinate have many defects. The preparation method of the invention comprises the steps of 1) preparing dialkylphosphinic acid or/and dialkylphosphinate into a solution; 2) adding a compound, dissolved in an alcohol or/or aqueous solution and containing nitrogen or both nitrogen and phosphorus, as precipitation seed crystal into the solution of dialkylphosphinic acid or/and dialkylphosphinate, and adding suitable surfactant to provide improved dispersion to obtain mixed solution; 3) dropwise adding soluble metal salt solution into the above mixed solution, cooling after reacting, filtering, washing, and drying to obtain the large-particle-size spherical dialkylphosphinate. The large-particle-size spherical dialkylphosphinate of the invention can be added to a polymer material as a halogen-free flame retardant in order to improve polymer mobility, and the mixing effect is significant.

The invention relates to a method for synthesizing small-crystal-grain aluminum phosphate molecular sieves AlPO4-34. According to the method, pseudo-boehmite or aluminum isopropoxide is used as an aluminum source, phosphoric acid serves as a phosphorus source, tetraethylammonium hydroxide and morpholine serve as template agents, and hydrofluoric acid serves as a fluorine source. The small-crystal-grain aluminum phosphate molecular sieves AlPO4-34, which are high in crystallinity and regular in crystal form, are synthesized by a pre-crystallization and seed crystal adding method on the basis of using the conventional raw materials and the mixed template agent. The grain size is small, and the average grain size is smaller than 1.5 microns and is only 0.05 to 1 micron after conditions are optimized. According to the method, the crystallinity is high, the morphology is regular, and the grain size distribution is uniform.

The invention discloses a preparation method of an arginine dexibuprofen raw medicine. The method comprises the steps of: dissolving dexibuprofen in ethanol, heating the mixture to a temperature of 50DEG C-60DEG C, adding L-arginine in a dropwise manner slowly and continuously under stirring within 10min-20min, continuing stirring for reaction for 2h-3.5h with the temperature maintained at 50DEG C-60DEG C, leaving the mixture to stand for 25min-35min and cool to a temperature of 18DEG C-30DEG C, conducting pumping filtration so as to obtain crystals, then washing and drying the crystals, thus obtaining white crystals, i.e. arginine dexibuprofen. The preparation method of the invention has simple process, high yield, no refining step, shortened production period, and no need for any special equipment, thus being suitable for industrial production.

The invention relates to a production technology and application of calcium hydrophosphate. The production technology comprises the following steps of: by using an ammonium dibasic phosphate and a calcium chloride solution as raw materials, carrying out double liquid phases to obtain hydryoxyapetite by stirring at a certain temperature and flow rate, then dewatering through a belt filter to separate and washing a mother liquid till chloride ions reach 500PPM, thus obtaining hydryoxyapetite; adding a certain amount of deionized water to hydryoxyapetite, adjusting a slurry ratio to be in line with technological requirements, adding a certain amount of acid, carrying out high-temperature digestion after adjusting a pH value, observing the state of the slurry after raising the temperature to 90 DEG C, stopping heating when the slurry is expanded and solidified, and removing two crystal water after settling for 30 minutes, thereby obtaining calcium phosphate dibasic anhydrous; carrying out washing chlorine, dewatering, drying and sieving, thus obtaining the calcium hydrophosphate finished product. The production technology has the advantages that the synthetic technology is simple, raw materials are easily obtained, by-products can be recycled, and the environmental pollution is little.

The present invention provides a kind of preparation method of nano-calcium carbonate, comprises the following steps: (1) take out and weigh the quicklime obtained after the limestone is calcined at high temperature, digest the quicklime, and refine it into Ca( OH)2 slurry; (2) Prepare Ca(OH)2 raw slurry for refrigeration, add crystal form control agent to react, then add dispersant, carbonize with CO2, (3) thicken the cooked slurry after carbonization, add Activated by composite activator, dehydrated, dried, pulverized and classified to obtain 50-100nm nano-active calcium carbonate. By adopting the preparation method and surface modification method of nano-calcium carbonate of the present invention, the prepared nano-calcium carbonate has moderate specific surface area, regular crystal form, and good surface modification effect, which can greatly improve the excellent dispersion performance and ink absorption of calendered film products. performance, with very good market value.

The invention discloses a preparation method of a SAPO-56/SAPO-34 composite molecular sieve synthesized by N,N,N,N-tetramethyl-1,6-hexamethylenediamine and triethylamine. The preparation method comprises the steps that firstly, the N,N,N,N-tetramethyl-1,6-hexamethylenediamine and the triethylamine are fully stirred and uniformly mixed; then, the mixture is added into a water solution to obtain a mixed solution; an aluminum source and a silicon source are sequentially added into the mixed solution; the stirring is performed for a period of time until the dissolution is complete; then, phosphoric acid is dropwise added; after the stirring is performed for a period of time, uniformly mixed gel is obtained; the obtained mixture is transferred into a high-pressure reaction kettle; after the crystallization reaction, a solid-phase product is subjected to deionized water washing, filtering and drying; then, roasting is performed in a muffle furnace; the composite SAPO-56/SAPO-34 molecular sieve is obtained. The synthesized SAPO-56/SAPO-34 composite molecular sieve has the advantages that the crystal morphologies are different; the crystal form is regular; the solid phase yield is high; the foundation is laid for the further preparation and study of the composite molecular sieve.

The invention provides a preparation method of F-doped gamma-ferric oxide hollow microspheres with adjustable bandwidth. The preparation method comprises the steps of: (A) adding soluble ferric salt to 40 mL of ethylene glycol solution, and sufficiently stirring to form a first solution; (B) weighing a certain amount of fluoride salt, dissolving in the first solution, and sufficiently stirring to form a second solution, wherein 0<RF<=3 and RF is the atom number ratio of F to Fe; (C) adding ethylene diamine to the second solution to obtain a third solution; and (D) placing the third solution in a sealed reaction container, insulating heat for several hours to obtain precipitate, washing the precipitate, drying, and finally calcining at 250 DEG C to prepare the F-doped gamma-ferric oxide hollow microspheres, wherein the bandwidth of the F-doped gamma-ferric oxide hollow microspheres is adjusted by adjusting the RF value. The prepared F-doped gamma-ferric oxide hollow microspheres have the characteristics of good dispersivity, uniform size, regular crystal form and the like; and the raw materials are low in cost, and the preparation method is simple in process, can realize large-scale preparation and is suitable for scale production.

The invention relates to the field of compound crystal forms, in particular to a preparation method of a prothioconazole I-type crystal form. The preparation method comprises the following steps: dissolving a prothioconazole raw material in a solvent, filtering to obtain filtrate, standing the filtrate and separating out a solid phase, namely the prothioconazole I-type crystal form. According to the technical scheme, the prothioconazole I-type crystal form is prepared through a solvent evaporation method and a cooling method, the method is simple and easy to implement and low in cost, and theprepared product is high in yield and purity, good in stability without coalescence and suitable for being applied to industrial production.

The invention relates to a nanometer praseodymium-zirconium yellow material and a preparation method thereof. The method comprises the following steps of uniformly mixing praseodymium nitrate, a soluble silicon source water solution and a soluble zirconium source water solution to obtain a mixed solution; regulating the pH value of the obtained mixed solution to 6 to 8; performing hydrothermal reaction for 10 to 20 hours at 180 to 240 DEG C; then performing suction filtering and drying to obtain hydrothermal products; performing high-temperature treatment on the hydrothermal products at 800 to1200 DEG C for 1 to 4 hours; then performing grinding to obtain the nanometer praseodymium-zirconium yellow material. The nanometer praseodymium-zirconium yellow material obtained through preparationhas the advantages that the particle diameter is in a nanometer stage; the uniformity and stability are realized; the crystal form is regular; the color is fresh and bright; the application field iswide.