10 results about "Alumina column" patented technology

A process for producing technetium-99m from a molybdenum-100 metal powder, comprising the steps of:(i) irradiating in a substantially oxygen-free environment, a hardened sintered target plate coated with a Mo-100 metal, with protons produced by a cyclotron;(ii) dissolving molybdenum ions and technetium ions from the irradiated target plate with an H2O2 solution to form an oxide solution;(iv) raising the pH of the oxide solution to about 14;(v) flowing the pH-adjusted oxide solution through a resin column to immobilize K[TcO4] ions thereon and to elute K2[MoO4] ions therefrom;(vi) eluting the bound K[TcO4] ions from the resin column;(vii) flowing the eluted K[TcO4] ions through an alumina column to immobilize K[TcO4] ions thereon;(viii) washing the immobilized K[TcO4] ions with water;(ix) eluting the immobilized K[TcO4] ions with a saline solution; and(x) recovering the eluted Na[TcO4] ions.

The invention discloses modified resin for MLCC, external electrode copper paste and a preparation method of the modified resin. The preparation method of the modified resin comprises the steps that ethyl cellulose serves as a raw material, ethyl cellulose with different substitution degrees and molecular weights is selected, 2-bromoisobutyryl bromide is used for esterification modification, and an EC-Br macroinitiator is prepared; the preparation method comprises the following steps: by taking EC-Br as an initiator, adding a solvent dimethylformamide into a Sureng bottle, adding monomers methyl methacrylate and butyl methacrylate, a ligand and a catalyst after the initiator is completely dissolved, and heating for polymerization reaction after three freeze-thaw cycle processes; and filtering the reaction solution with a neutral alumina column until the reaction solution is neutral, precipitating in deionized water, centrifuging, and carrying out vacuum drying until the weight is constant to obtain the modified resin EC-g-P (MMA-co-BMA). The modified resin is dissolved in an organic solvent to prepare an organic carrier, then the organic carrier is homogenized and mixed with metal copper powder and glass powder, and the external electrode copper paste with excellent rheological property and sintering property for MLCC end capping can be obtained after squeezing.

The invention discloses a method for detecting the content of polycyclic aromatic hydrocarbon and application. The method comprises the following steps: S1, pretreatment; s2, extracting; s3, reverse extraction; s4, activating; s5, purifying; s6, detecting; and S7, analyzing. The method is applied to polycyclic aromatic hydrocarbon detection of rubber filling oil, polycyclic aromatic hydrocarbon detection of smokeless tobacco products, nitro polycyclic aromatic hydrocarbon detection of rice and soil or polycyclic aromatic hydrocarbon detection of milk. Aiming at the problem that in the prior art, rubber filling oil and other oil products cannot be subjected to two-phase layering in the extraction process, hexamethylbenzene is adopted as an internal standard substance, and after absolute ethyl alcohol is selected to be added, the two phases can be layered to break the emulsification phenomenon; meanwhile, a comprehensive solid-phase extraction column combining a silica gel reverse-phase solid-phase extraction column and an aluminum oxide column is adopted, the separation effect is good, losses caused in the separation process are reduced, and errors are reduced.

This invention belongs to the fields of pharmaceutical chemistry and radiomedicine, specifically relating to a ruthenium complex with dual activation capabilities for near-infrared light and X-rays, its preparation method, and its application in antitumor drugs. The complex is characterized by the chemical structural formula [Ru(NO2-tpy)(Pyr-phen)Cl](PF6). The preparation method involves weighing the ligand p-Pyr-phen, the ruthenium precursor Ru(NO2-tpy)Cl3, and lithium chloride LiCl in an ethanol / water mixed solvent, and carrying out a reflux reaction in the presence of triethylamine. After the reaction is complete, the mixture is cooled to room temperature, and then an aqueous solution of ammonium hexafluorophosphate is added. After stirring, a precipitate is formed, collected, and washed sequentially with water and ethanol to remove soluble inorganic salts and polar impurities. The ruthenium complex is obtained after washing and alumina column chromatography. The advantages include a narrower bandgap, stronger near-infrared absorption, and direct X-ray activation capability, enabling dose-dependent generation of singlet oxygen.

The invention discloses a refining method of electronic-grade N-hydroxymethyl acrylamide, which aims to obtain an N-hydroxymethyl acrylamide monomer with low metal impurity content, and comprises the following treatment steps: (1) dissolving N-hydroxymethyl acrylamide in an organic solvent; (2) enabling a solution of N-hydroxymethyl acrylamide to flow through the filled neutral alumina column to adsorb oligomers and part of metal ions; and (4) adding an ethanol / water mixed solution into the viscous liquid obtained after distillation, cooling to separate out a solid, and drying at 40 DEG C to obtain the low-metal N-hydroxymethyl acrylamide monomer, the metal ion is less than 50ppb, the refining yield is about 60%, and the method is simple in process and suitable for industrial production.

The present invention discloses a method for extracting and purifying boson, and belongs to the technical field of enzyme-catalyzed boson production. The method comprises the following steps: (1) inactivating the enzyme-catalyzed reaction liquid containing boson, filtering it through a ceramic membrane, and obtaining a filtrate; (2) desalting the filtrate through electrodialysis to obtain a desalted liquid; (3) decolorizing and removing impurities from the desalted liquid through a zeolite molecular sieve column and an alumina column to obtain a decolorized liquid; (4) concentrating and freeze-drying the decolorized liquid to obtain boson. The method of the present invention has a simple process, can effectively remove impurities such as proteins, pigments, and salts brought about in the enzyme reaction process, abandons the use of toxic organic reagents, is low in cost, is green and environmentally friendly, has high product purity, and has good output quality, and is suitable for industrial production.

The invention discloses a method for determining the residual quantity of diallyl disulfide and diallyl trisulfide, which comprises the following steps: extracting diallyl disulfide and diallyl trisulfide in an aquatic product by using a dichloromethane solution, purifying by using a neutral alumina column, determining by using a gas chromatography-tandem mass spectrometer, and quantifying by using an external standard method. According to the method, the gas chromatography-tandem mass spectrometry is adopted for simultaneously analyzing the residual quantity of diallyl disulfide and diallyl trisulfide in the aquatic product for the first time, accurate qualitation and accurate quantification can be achieved, the blank of a method for measuring the residual quantity of thioether floxacin through gas chromatography-tandem mass spectrometry is filled, and the method is suitable for large-scale popularization and application. The method is obviously superior to gas chromatography and gas chromatography-mass spectrometry in qualitative and quantitative aspects. The method is simple and convenient in pretreatment, low in reagent consumption, accurate and reliable in determination result, high in sensitivity, good in result reproducibility and accurate in quantification.

The utility model discloses a health environmental protection type outer wall brick relates to outer wall brick field, including wall brick body, the wall brick body top is connected with the anti -aging structure, the surface of alumina column has the transparent ceramic coating that smears, the wall brick body top is seted up with the water -repellent groove, the wall brick body side is provided with the clamping mechanism of improving wall brick practicality, and the clamping mechanism includes the connecting block no. of symmetry connection in the both sides of wall brick body, the connecting block no. bottom is fixed with two insert blocks. This health environmental protection type outer wall brick, when wall brick outer wall receives light, light is through transparent ceramic coating and shines to the mirror surface of the top end of alumina column that is inclined and is not the same in direction, will reflect light, reduces the heat accumulation of wall brick body, and transparent ceramic coating can protect the antifouling and anticorrosive of alumina column, and PTFE spacer is pasted wall brick side, and the wall brick is stably protected by the characteristics such as insulation, corrosion -resistant, non -water absorption, and two water -repellent grooves can be quickly discharged with the inclined plane rainwater, and multiple protection prolongs the life of wall brick, and indirectly improves environmental protection.

The invention discloses a test solution for detecting the content of triptolide, a preparation method and a detection method, and relates to the technical field of compound content detection. The preparation method of the test solution comprises the following steps: precisely weighing an object to be detected, adding an extraction solvent for extraction, filtering, passing the filtrate through a neutral alumina column, eluting with methanol, collecting the eluate, and recovering the eluate to be dry to obtain residues; adding a first methanol solution into the residues, dissolving, fixing the volume, and uniformly shaking; the to-be-detected substance comprises the content of the artemisia selengensis wind-dispelling capsule. The preparation method disclosed by the invention is simple to operate, the same solvent is preferably selected for extraction and elution, the redundant operation of concentrating and redissolving when different solvents are used is avoided, and the toxicity risk of the solvents is greatly reduced. The test solution for detecting the content of triptolide, provided by the invention, is suitable for HPLC (High Performance Liquid Chromatography) analysis and has a good impurity removal effect; when the test solution provided by the invention is used for detecting the content of triptolide, and specific chromatographic conditions are matched, the method has the advantage of high accuracy.

The invention provides a preparation process and a decoloration purification method of p-hydroxybiphenyl nitrile for display, and belongs to the technical field of organic synthesis and preparation of liquid crystal material intermediates. Aiming at the defects of high cost, low yield and poor product purity of the existing process, the invention adopts the innovative design of three-step core reaction and four-step decoloration purification: methylsulfonyl chloride is used for replacing benzene sulfonyl chloride to realize hydroxyl low-cost protection, and the isomer content 1t is controlled through four-section gradient heating bromination reaction; and decoloring and purifying by a four-step method of ethanol extraction, activated carbon decoloring, EDTA (Ethylene Diamine Tetraacetic Acid) complexing, alumina column chromatography and DMF (Dimethyl Formamide) / dichloroethane recrystallization. The method has the beneficial effects that the raw material cost is obviously reduced compared with that of a traditional process, and the total molar yield is increased from 48% to 60%; the product purity reaches 99.8%, the chromaticity L value is 92, and the heavy metal residue is 1t; the method overcomes the defects of high cost, low yield, difficulty in decolorization and the like of the traditional process, and the used raw materials and equipment are chemical conventional categories, have definite steps and can be industrially amplified.