Patents
Literature

269results about How to "Less side effects" patented technology

Preparation method of large-sized perovskite structure CH3NH3PbI3 crystal

The invention discloses a preparation method of a large-sized perovskite structure CH3NH3PbI3 crystal. The method comprises the following steps: dissolving PbI2 into an HI (Hydrogen Iodide) solution, and preparing a Pb<2+>-HI solution; mixing the HI solution with a CH3NH2 solution in the molar ratio of 1:1, and reacting the mixture at the temperature of 0 DEG C for 2 hours to obtain a CH3NH2I solution; mixing the Pb<2+>-HI solution with the CH3NH2I solution, preheating at the temperature of 95 DEG C for 48-72 hours to obtain an oversaturated solution, and filtering the oversaturated solution to obtain a mother liquor for growing the CH3NH3PbI3 crystal, wherein the molar ratio of CH3NH2I to Pb<2+> is (1-2):1; and preheating the mother liquor in a water bath of 95.5-96 DEG C for 12-24 hours, placing the preheated mother liquor into a crystal growing container, performing programmed cooling to 45 DEG C, and keeping a constant temperature to obtain the CH3NH3PbI3 crystal. In a process of the method, the HI solution participates in the synthesis of raw materials, and is taken as a solvent of crystal growing, so that the method has the advantages of simple synthesizing process and small number of side reactions; and a growing device is simple, and a high-quality and large-sized crystal can be grown.
Owner:江苏荣辉电力设备制造有限公司

Method for extracting vitamin E and phytosterin from cottonseed oil deodorizer distillate

The invention discloses a method for extracting vitamin E and phytosterin from cottonseed oil deodorizer distillate, comprising the following steps that: methanol is added by taking cottonseed oil deodorizer distillate as raw material, reaction is proceeded by taking strong-acid cation exchange resin as catalyst so that free fatty acid in the raw material is converted into relative methyl ester; the catalyst is filtered; the filtrate is evaporated and is then formulated into mixed solution with ethanol after methanol and water are removed, after the mixed solution passes through an adsorptioncolumn filled with adsorbent, bed is washed with ethanol until the effluent solution is transparent and clear, and the effluent solution is collected; the adsorption column is eluted with acetic acidethanol solution, the eluant is collected and then subjected to reduced pressure evaporation, and vitamin E is acquired after the solvent is removed; the material of the effluent solution in which ethanol is removed by evaporation is dissolved in methanol, crystals are separated subsequent to temperature reduction and standing under stirring, and phytosterin crystals are acquired by filtering separation. The invention simplifies the steps for reaction and has the characteristics of small corrosiveness to equipment, no environmental pollution, simple operation and less equipment investment.
Owner:TIANJIN UNIV

High-nickel positive electrode material for non-aqueous electrolyte secondary battery and preparation method for high-nickel positive electrode material

The invention discloses a high-nickel positive electrode material for a non-aqueous electrolyte secondary battery and a preparation method for the high-nickel positive electrode material. The high-nickel positive electrode material is represented by a general formula: Li<w>Ni<1-x-y>Co<x>Mn<y>M<z>O<2>, wherein an average particle diameter D50 is 8-15 [mu]m, and is formed by the small particle sizeD50 of 2-5 [mu]m and the small particle size D50 of 8-18 [mu]m, the Co content (metal molar ratio, SC) of the small particle diameter is higher than the Co content (metal molar ratio, LC) of the largeparticle diameter, and the Co concentration ratio (SC/LC) is preferably from the range of 1.2-2. According to the invention, the material structure of the high-nickel positive electrode material is stabilized through element doping and coating, and the crystal structure of the material is stabilized by increasing the cobalt content in the small particle size, and the cycle performance of the material is improved; and finally, the small particle size and the large particle size are mixed according to different proportions, so that the tap density of the positive electrode material and the compaction density of a pole piece are improved.
Owner:郑州中科新兴产业技术研究院 +1

Cross-linked sodium hyaluronate and preparation method and application thereof

The invention relates to cross-linked sodium hyaluronate and a preparation method and application thereof. The cross-linked sodium hyaluronate is prepared from raw materials, including sodium hyaluronate, an inorganic salt and a cross-linking agent. The preparation method comprises the steps: dissolving a certain amount of sodium hyaluronate in an alkaline solution with the pH value of 7.5 to 9.0, then, adding a certain amount of inorganic salt into the solution, and carrying out stirring until the inorganic salt is completely dissolved; heating the solution to the temperature of 20 DEG C to 60 DEG C, then, slowly dripping a certain volume of cross-linking agent solution into the solution, carrying out stirring, and carrying out a reaction for a period of time while carrying out heat preservation; adjusting the pH to 7.1 to 7.5 with acid, carrying out balancing for 1 to 2 hours, then, carrying out precipitation with ethanol or an ethanol solution, so as to obtain lumpy solids, i.e., the cross-linked sodium hyaluronate. By the method provided by the invention, the cross-linking efficiency of the cross-linked sodium hyaluronate can be increased, the reaction yield can be increased, side reactions can be reduced, and the residual of the cross-linking agent can be reduced; the prepared cross-linked sodium hyaluronate is safe and non-toxic, is good in stability, long in in-vivo retention time and good in filling effect and is applicable to in-vivo injection.
Owner:BEIJING DATSING BIO TECH

Method for reducing content of residual alkali on surface of high-nickel cathode material of lithium-ion battery

PendingCN111370684ALess side effectsImprove processing performance and cycle lifeCell electrodesSecondary cellsElectrical batteryOrganosolv
The embodiment of the invention relates to a method for reducing the content of residual alkali on the surface of a high-nickel positive electrode material of a lithium ion battery. The method comprises the following steps: adding a certain amount of acid or a derivative of the acid into a certain amount of non-aqueous inactive hydrogen organic solvent at a stirring speed of 1m/s to 10m/s at normal temperature, and stirring until the acid or the derivative of the acid is completely dissolved, so as to obtain a washing solution for reducing residual alkali on the surface of the high-nickel positive electrode material of the lithium ion battery; wherein the mass ratio of the to-be-treated high-nickel positive electrode material to the non-aqueous non-active hydrogen organic solvent is 1:0.5-1:4; wherein the molar concentration of the acid or the derivative of the acid in the washing liquid is 0.5-1.5 times of the molar weight of the residual alkali on the surface of the to-be-treated high-nickel positive electrode material; adding a to-be-treated high-nickel positive electrode material into the washing liquid while stirring at a linear speed of 1m/s to 10m/s, and stirring for 1 to 120 minutes; and centrifuging to remove the solvent, vacuumizing, heating and drying at 20-80 DEG C to obtain the treated high-nickel positive electrode material.
Owner:TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD

Method for preparing penam sulfoxide acid diphenyl methyl ester which is tazobactam precursor

ActiveCN106967089ALess side effectsReduce organic emissionsOrganic chemistryBromineChemistry
The invention provides a method for preparing penam sulfoxide acid diphenyl methyl ester. The method includes steps of carrying out bromination reaction on 6-aminopenicillanic acid to obtain first reaction products; carrying out reaction on the first reaction products and diphenyl-chloromethane under the effects of phase transfer catalysts to obtain second reaction products, adding hydrogen peroxide into the second reaction products, carrying out oxidation reaction on the hydrogen peroxide and the second reaction products to obtain third reaction products and centrifugally washing the third reaction products to obtain 6-bromine penicillin sulfoxide acid diphenyl methyl ester; carrying out further reaction on the 6-bromine penicillin sulfoxide acid diphenyl methyl ester to obtain the penam sulfoxide acid diphenyl methyl ester. The method has the advantages that dichloromethane and water are used as solvents in the bromination reaction, accordingly, side reaction in the bromination reaction can be reduced, and emission of organic matters in wastewater can be reduced; ester with a high yield can be obtained from diphenyl mecloqualone by the aid of the phase transfer catalysts, the cost can be saved as compared with other processes by the aid of diphenyl carbinol used as a raw material and DCC (dicyclohexylcarbodiimide) used as a catalyst and processes by the aid of benzophenone hydrazone and catalysts which comprise explosive peracetic acid and added potassium iodide, and processes for preparing the penam sulfoxide acid diphenyl methyl ester are green and safe.
Owner:通辽华旭药业有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products