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Combined pretreatment method for efficiently separating bagasse biomass components
InactiveCN102180994ANo pollution in the processReduce energy consumptionBiofuelsFermentationAlkaline waterPretreatment method
The invention discloses a combined pretreatment method for efficiently separating bagasse biomass components, which mainly comprises the following steps: preimpregnating in dilute sulfuric acid; carrying out steam explosion treatment; washing with hot water; extracting; and carrying out enzymolysis. In the combined pretreatment method disclosed by the invention, on the basis of different physicochemical properties and structural features of the three components (hemicellulose, cellulose and lignin) in the bagasse, the component hemicellulose is sufficiently degraded and separated by dilute acid preimpregnation-steam explosion pretreatment, thereby reserving most of the cellulose and lignin; and the lignin is extracted by using a lower alcohol-alkaline water system, leaving high-cellulose-content residues. On the premise of low concentration of the added enzyme, the invention obviously increases the enzymolysis rate, and raises the conversion rate and comprehensive utilization rate of the bagasse biomass resource.
Owner:GUANGZHOU YOURUI BIOSCI
Method for producing ethanol by high-efficiency simultaneous saccharification and cofermentation
InactiveCN102251010AReduce pollutionNo pollution in the processBiofuelsMicroorganism based processesEthanol yieldHemicellulose
The invention discloses a method for producing ethanol by high-efficiency simultaneous saccharification and cofermentation, which comprises the following steps: pretreating; concentrating and detoxifying; preparing yeast seed solution; performing simultaneous saccharification and cofermentation; and distilling / rectifying. When the method provided by the invention is used, the inhibition action of a monosaccharide component formed by hydrolysis of cellulose on cellulose is relieved, the enzymolysis saccharification efficiency and fermentation yield are improved, the recovery rate of hemicelluloses in bagasse is about 60 percent, the cellulose recovery rate is about 86 percent, and the total ethanol yield of dry bagasse can reach about 20 percent.
Owner:GUANGZHOU YOURUI BIOSCI
Method for synthesizing alpha-amino-acid ester
InactiveCN102675135AHigh activityMild reaction conditionsOrganic compound preparationAmino-carboxyl compound preparationAfter treatmentHydrolysis
The invention discloses a method for efficiently synthesizing alpha-amino-acid ester, which comprises the following steps: by using alpha-eleostearates and benzyl amine as raw materials and triethylamine as a catalyst, ammonifying alpha-eleostearates in different structures by a one-pot method under the action of the catalyst; and carrying out after-treatments, including hydrolysis, extraction, column chromatography and the like, to obtain the alpha-amino-acid ester. The maximum reaction yield is up to 95%. In view of the advantages of wide substrate applicability, mild reaction conditions, simple operation and high yield in the method disclosed by the invention, the invention has certain potential industrial application value.
Owner:INST OF CHEM CHINESE ACAD OF SCI
Hierarchical titanium dioxide microspheres based on surface oriented growth nano-rods and preparation method thereof
InactiveCN104843786AUnique three-dimensional hierarchical structureLarge specific surface areaPhysical/chemical process catalystsNanotechnologyMicrosphereCarbonization
The invention relates to hierarchical titanium dioxide microspheres based on surface oriented growth nano-rods and a preparation method thereof. The hierarchical titanium dioxide microspheres are three-dimensional microspheres formed by a cluster of one-dimensional nano-rods which own a common core and grow uniformly and outwards in a radiation manner along the core. The preparation method comprises the following main steps of: adding a titanium precursor in a polycondensation reaction process of resorcinol-formaldehyde, then preparing organic gel in a sol-gel process, and finally carrying out high-temperature carbonization to obtain the titanium dioxide nano-rod microspheres with hierarchical structures. The hierarchical titanium dioxide microspheres based on the surface oriented growth nano-rods, prepared by the method, have a good adsorption performance and a good pollutant photocatalytic degradation performance; and after being used, the hierarchical titanium dioxide microspheres based on the surface oriented growth nano-rods are separated from water simply and conveniently, thus easily realizing the recycling and reusing of photocatalytic materials. In addition, the preparation method is simple in technology, the mass production is easily realized by adopting the preparation method, the appearance and size of the products are controllable, and the products are high in crystalline of degree and conform to practical production application requirements.
Owner:SHANDONG UNIV
Self-supported attapulgite nanofiber membrane, and preparation method thereof
InactiveCN106390773AAbundant raw materialsGreat potential for industrializationMembranesSemi-permeable membranesFiltrationUltrafiltration
The invention relates to a self-supported attapulgite nanofiber membrane, and a preparation method thereof. The self-supported attapulgite nanofiber membrane is a nanofiber membrane with a three-dimensional net structure, and is formed via combination of attapulgite with a water-soluble polymer. The preparation method comprises following steps: attapulgite colloid and a solution of the water-soluble polymer are mixed and concentrated so as to obtain a mixed slurry; the mixed slurry is subjected to suction filtration so as to obtain a membrane; and the membrane is dried, and is subjected to step sintering in an inert atmosphere so as to obtain the finished product. The self-supported attapulgite nanofiber membrane possesses uniformly distributed nano-scaled pores and chemical corrosion resistance, is high in mechanical strength, and excellent in adsorption performance, and can be applied to the field of ultrafiltration.
Owner:DONGHUA UNIV
D-acetylglucosamine deacetylase heterologous expression and application
InactiveCN105274081AGreat potential for industrializationStrong substrate specificityBacteriaHydrolasesHeterologousBio engineering
The present invention belongs to the field of biological engineering, and specifically discloses high-quality D-acetylglucosamine deacetylase heterologous expression and application. The amino acid sequence of the D-acetylglucosamine deacetylase is as shown in SEQNO. 1. Through enzymatic activity measurement and substrate specificity analysis, the D-acetylglucosamine deacetylase is strong in substrate specificity, and in the substrate for researches, D-acetylglucosamine (GlcNAc) and beta-bonded D-acetylglucosamine (GlcNAc) are deacetylated targetedly to generate D-glucosamine (GlcN) or beta-bonded glucosamine (GlcN). Recombinant D-acetylglucosamine deacetylase is expressed by use of genetic engineering cloning, the D-acetylglucosamine deacetylase can be strongly expressed, and high-quality D-acetylglucosamine deacetylase can be obtained.
Owner:NANJING AGRICULTURAL UNIVERSITY
Method for purifying metal material under temperature difference
InactiveCN103589874AResolving contradictions that spread fasterSmall geometryMetallic materialsTemperature difference
The invention discloses a method for purifying a metal material under a temperature difference. According to the method, a metal material to be purified and a degassing agent are placed into a closed system and the inner part of the closed system is vacuum or is in an appropriate atmosphere; a certain distance is kept between a raw material and the degassing agent to heat under the temperature difference; in the heating process, impurities enter the closed system from the metal material to be purified and then are absorbed by the degassing agent. The method for purifying the metal material under the temperature difference has low requirements on a geometric dimension of the metal material, original impurity content and vacuum degree, is low in cost and high in efficiency, and has a great potential for realizing industrialization.
Owner:PEKING UNIV +1
Method for preparing porous carbon material through polyester low-temperature carbonization
ActiveCN111410184ALow carbonization temperatureIncrease profitCarbon preparation/purificationPolyesterPolymer science
The invention belongs to the technical field of polymer carbonization, and particularly relates to a method for preparing a porous carbon material through polyester low-temperature carbonization. A mixture of polyester and transition metal oxide is heated and carbonized at the temperature not higher than 500 DEG C, and a porous carbon material is prepared after aftertreatment. The transition metaloxide is used for promoting decarboxylation reaction of polyester in the heating carbonization process, eliminating weak oxygen-containing chemical bonds in the polyester and generating an intermediate degradation product, and the intermediate degradation product is used for constructing a carbon material skeleton through crosslinking, cyclization and / or aromatization reaction to form the porouscarbon material. The porous carbon material with high specific surface area is prepared by adopting a one-step carbonization method and utilizing the transition metal oxide to promote the carbonization of the waste polyester at a lower temperature, and a new method is provided for converting a large amount of cheap urban and industrial waste polyester into the porous carbon material with high additional value.
Owner:HUAZHONG UNIV OF SCI & TECH
Stacking shield modular steel support reinforcement structure capable of being installed and disassembled quickly
PendingCN109441490AReliable support reinforcement measuresEnsure construction safetyUnderground chambersTunnel liningComputer moduleModular design
The invention discloses a stacking shield modular steel support reinforcement structure capable of being installed and disassembled quickly. An annular I-shaped steel main support is arranged on the inner side of a the lower shield tunnel segment; the annular I-shaped steel main support is in an annular shape, and is composed of a plurality of arc-shaped annular I-shaped steel supports; two top end modules are connected with each other through the annular I-shaped steel supports and a first horizontal steel support which are corresponding to the two top end modules; two bottom end modules areconnected by the other annular I-shaped steel support; the two top end modules and the two bottom end modules are in one-to-one correspondence; and the corresponding top end module and the bottom endmodule are connected by another annular I-shaped steel support and vertical steel supports. The stacking shield modular steel support reinforced structure capable of being installed and disassembled quickly can provide reliable support and reinforcement measures for the lower shield, through the modular design of a steel support reinforcement system, the on-site operation procedures are simplified, and the beneficial effects of rapid installation and disassembly of the steel supports are realized.
Owner:CHINA RAILWAY LIUYUAN GRP CO LTD +1
Method for preparing mesopore type active carbon from amygdalus pedunculata shells
InactiveCN107445162ASolve pollutionAvoid harmCarbon compoundsEnvironmental resistanceSteam activation
The invention provides a method for preparing mesopore type active carbon from amygdalus pedunculata shells. A raw material, namely the amygdalus pedunculata shells, is subjected to high-temperature carbonization and steam activation to prepare an active carbon product with a high mesopore rate. Seed shells of a pioneer tree species amygdalus pedunculata for desert control are used as the raw material for preparing an adsorption material for environmental protection, and high-valued comprehensive utilization of special desert plant resources is realized; steam is used as an activating agent, and a technological process is clean and has no pollution; a prepared mesopore type fruit shell active carbon product has excellent adsorption performance on macromolecular drugs; the active carbon, which is prepared under the conditions that the carbonization temperature is 400 DEG C to 700 DEG C, the activation temperature is 800 DEG C to 1000 DEG C and the mass ratio of a carbonization material to the steam ranges from (1 to 2) to (1 to 7), has the mesopore rate of 82 percent or more and the adsorption capability on cephalexin of 260mg / g or more, so that the mesopore type active carbon has very high industrial production value.
Owner:INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY +1
Hydroformylation method and catalyst for preparing isononaldehyde
ActiveCN112441893AImprove conversion rateHigh purityOrganic compound preparationOrganic-compounds/hydrides/coordination-complexes catalystsPtru catalystReaction temperature
The invention discloses a hydroformylation homogeneous catalytic reaction method and a catalyst for preparing 3,5,5-trimethylhexanal from a mixture of 2,4,4-trimethyl-1-pentene and 2,4,4-trimethyl-2-pentene. The method and the catalyst are characterized in that a rhodium compound is used as a metal precursor of the catalyst; biphenyl tridentate and tetradentate phosphoramidite ligands are used asligands (frameworks I and II) of the catalyst to form a rhodium / polydentate phosphoramidite ligand catalytic system; a ratio of synthesis gas CO to H2 is 1: 1, a reaction temperature is 70-140 DEG C,a reaction pressure is 1-8 MPa, and a reaction lasts for 4-20 hours; and thus, 3,5,5-trimethylhexanal(isononaldehyde) is prepared from a C8 olefin mixture through a one-step reaction.
Owner:广东欧凯新材料有限公司
Method for large-scale preparation of mesoporous silica
The invention discloses a method for large-scale preparation of mesoporous silica. The method comprises the steps of 1, mixing of coal ash and auxiliaries containing calcium and sodium, 2, grinding, 3, high-temperature treatment, 4, controllable corrosion and 5, drying so that the mesoporous silica can be obtained. The method effectively achieves the purpose of disposal of coal ash of a thermal power generation plant, and a novel scheme is provided for comprehensive utilization and high value-added utilization of coal ash; the adopted raw materials are low in price, and the synthesis cost is low; the synthesis process is simple and easy to implement industrially, and the great industrial potential is achieved; the synthetized mesoporous silica has the large specific surface area and the pore volume, the pore size distribution is relatively concentrated, and the wide application prospect is achieved in the chemical engineering fields such as adsorption and catalysis.
Owner:华东理工常熟研究院有限公司
Memory and preparation method thereof
ActiveCN103928611ASimple structureSmall sizeSolid-state devicesSemiconductor/solid-state device manufacturingConductive polymerPhotoresist
The invention relates to a memory and a preparation method thereof. The memory comprises a semi-conductor substrate, two electrodes arranged on the semi-conductor substrate at an interval and a film layer for enabling the two electrodes to be connected, wherein the film layer is composed of precious metal nano particles clad with conducting polymers. The preparation method of the memory comprises the following steps of (a) coating a layer of photoresist on the semi-conductor substrate in a spinning mode, and photoetching a cavity; (b) depositing metal in the cavity to form the two electrodes at an interval; (c) preparing precious metal nano particle / conducting polymer composite materials; (d) dropping the composite materials diluted by deionized water between the two electrodes at an interval. By means of the film layer connected between the two electrodes and composed of the precious metal nano particles clad with the conducting polymers, the memory is simple in structure, small in size, low in cost and high in integration degree and stability and has high response signals.
Owner:SUZHOU UNIV
A kind of mesoporous catalyst with hydrothermal stability, its preparation method and the method for preparing bio-oil by using it to catalyze hydrothermal liquefaction microalgae
InactiveCN105772076BOvercoming and mitigating pollution problemsReduce energy consumptionOrganic chemistryOrganic-compounds/hydrides/coordination-complexes catalystsMolecular sieveHydrogen
The invention discloses a mesoporous catalyst with the hydrothermal stability.The mesoporous catalyst is prepared by grafting organic functional groups to the surface of an SBA-15 type mesporous molecular sieve, wherein hydrogen-containing silane is adopted as a reagent for grafting the organic functional groups, the structural general formula is as shown in the description, and R1, R2 and R3 represent the different organic groups or the same organic group.The invention further discloses a method for preparing bio-oil by catalyzing hydrothermally-liquidized microalgae through the mesporous catalyst with the hydrothermal stability.
Owner:TSINGHUA UNIV
Method for preparing microwave-assisted non ball milling rare-earth superfine powder
ActiveCN101979460ALow operating powerAvoid the disadvantages of long cycleLuminescent compositionsAcetic acidEthylene diamine
The invention discloses a method for preparing microwave-assisted non ball milling rare-earth superfine powder. A rare-earth compound is used as a raw material; ethylene diamine tetraacetic acid (EDTA), citric acid and the like are used as complexing agents; and the Y2O3: Eu and Y2O3: Er, Yb rare-earth superfine powder with small size and uniform distribution can be obtained by simple control of microwave, pH and heat insulation mode without any milling means. The preparation method is quick, time-saving, energy-saving, simple in equipment and safe and controllable to operate; an auxiliary dispersant does not need adding in the process, so the cost is saved and pollution is reduced; because milling is not needed, the damage to the crystal structure of the material is avoided, and the workload is relieved; and the obtained product has low hardness, small granule size (less than 100 nanometers) and uniform distribution.
Owner:广东炜林纳新材料科技股份有限公司
Polyolefin carbonization method
ActiveCN110817840APromote carbonizationInhibition of fractureCarbon preparation/purificationPolymer sciencePolyolefin
The invention belongs to the technical field of waste polymer carbonization, particularly relates to a polyolefin carbonization method, and more particularly relates to a method for promoting low-temperature and green carbonization of waste polyolefin by using biomass. The method comprises the steps: a mixture of polyolefin and biomass is heated in an oxygen-containing atmosphere, and undergoes acarbonization reaction, wherein the polyolefin is subjected to a reaction with oxygen under heating conditions, an oxygen-containing intermediate cross-linked structure is formed and is subjected to acondensation and / or polymerization reaction with an intermediate product containing hydroxyl and / or oxygen free radicals and formed in the carbonization process of biomass, to form a cross-linked structure, so that the breakage of a polymer main chain is inhibited, the carbonization of polyolefin is promoted, and an amorphous carbonized product is formed. Compared with a traditional carbonizationprocess, the method has the advantages that the energy loss is greatly reduced, the problem that polyolefin is difficult to carbonize under the condition of no catalyst is innovatively solved, and afeasible new technology is provided for large-scale recycling of waste polyolefin in the future.
Owner:HUAZHONG UNIV OF SCI & TECH
Process for preparing substitute liquefied natural gas (LNG) with coke-oven gas
InactiveCN104164264AWith characteristicsHave made significant progressGaseous fuelsMethanationImpurity
The invention provides a process for preparing substitute liquefied natural gas (LNG) with coke-oven gas. The process is characterized by subjecting the coke-oven gas to direct two-stage methanation reactions on a supported molybdenum-based sulphur-tolerant methanation catalyst after removing the impurities such as oil, naphthalene, benzene and the like from the coke-oven gas, then carrying out clean reaction through two-stage Ni-based methanation reactions after ferric oxide coarse desulfurization and activated carbon fine desulfurization, and finally separating the impurities such as N2, H2, H2O and little CO2 through subzero liquefaction, thus obtaining the LNG product with methane content higher than 97%. The process has the advantages of simple process flow, small equipment investment, low comprehensive energy consumption and excellent natural gas products.
Owner:SEDIN ENG +1
Positive electrode composite material for lithium primary battery and preparation method thereof
PendingCN113903897AIncrease specific energyUniform shapePositive electrodesLi-accumulatorsPhysical chemistryPrimary cell
The invention relates to a positive electrode composite material for a lithium primary battery and a preparation method thereof. Aiming at the problems that the energy density and the high-rate performance of the lithium primary battery cannot be simultaneously realized, and the heat production is serious when the lithium primary battery is used under a high-rate working condition, a multi-layer composite structure of a non-lithium-containing positive electrode material is designed and developed, and the high specific energy of the lithium primary battery is realized through the multi-electron transfer reaction of active substances in the structure; and meanwhile, an electrode active material is used for coordinating and continuing a discharging strategy, so that the self-discharging weakness of the composite positive electrode is compensated, the discharging rate performance is improved, and the discharging of a synergistic interaction mechanism is realized. The lithium primary battery positive electrode composite material is prepared from fluoride and an oxygen group element material simple substance or compound through spray heat treatment, and the fluoride is composed of porous hollow spherical particles formed by fluorinated metal coated with carbon fluoride. According to the prepared composite positive electrode material, the specific discharge energy and specific power of a lithium primary battery are remarkably improved, and the specific discharge energy of the prepared lithium primary battery at the 20-hour rate is greater than 800 Wh / kg.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Method for preparing 3,4-dihydrobenzo[b][1,4]oxazine derivatives
The invention provides a method for preparing 3,4-dihydrobenzo[b][1,4]oxazine derivatives. The method comprises the following step: carrying out reduction reaction on [b][1,4]oxazines in the presence of hydrogen gas by using B(C6F5)3 as a catalyst to obtain the mixture containing the 3,4-dihydrobenzo[b][1,4]oxazines disclosed as Formula I. Benzo[b][1,4]oxazines in different structures are used as a substrate to synthesize the benzo[b][1,4]oxazines at high yield by using the B(C6F5)3 as the catalyst. The method has the advantages of cheap and accessible raw materials, high reaction activity, no participation of transition metals and wide substrate application range, and has huge industrialization potential.
![Method for preparing 3,4-dihydrobenzo[b][1,4]oxazine derivatives](https://images-eureka.patsnap.com/patent_img/623c4d84-4aee-4171-b56b-c9f12e48455b/HDA0000934066430000011.PNG "Method for preparing 3,4-dihydrobenzo[b][1,4]oxazine derivatives")
![Method for preparing 3,4-dihydrobenzo[b][1,4]oxazine derivatives](https://images-eureka.patsnap.com/patent_img/623c4d84-4aee-4171-b56b-c9f12e48455b/HDA0000934066430000012.PNG "Method for preparing 3,4-dihydrobenzo[b][1,4]oxazine derivatives")
![Method for preparing 3,4-dihydrobenzo[b][1,4]oxazine derivatives](https://images-eureka.patsnap.com/patent_img/623c4d84-4aee-4171-b56b-c9f12e48455b/HDA0000934066430000013.PNG "Method for preparing 3,4-dihydrobenzo[b][1,4]oxazine derivatives")
Owner:INST OF CHEM CHINESE ACAD OF SCI
A kind of carbonization method of polyolefin
ActiveCN110817840BPromote carbonizationInhibition of fractureCarbon preparation/purificationPolymer sciencePolyolefin
Owner:HUAZHONG UNIV OF SCI & TECH
Nano cellulose and preparation method thereof
ActiveCN111793139ALow reaction pressureLower requirementCosmetic preparationsToilet preparationsOrganic acidMaterials science
The invention discloses a nano cellulose and a preparation method thereof. The water contact angle of the nano cellulose is smaller than 20 degrees. The method prepares the nano cellulose in an organic acid system, and at least comprises the following steps: (1) reacting a cellulose raw material with an organic acid solvent and water to obtain a solid reactant, and washing the solid reactant to beneutral; and (2) drying the obtained solid reactant to obtain the nano cellulose. According to the method, the organic acid is adopted to hydrolyze the cellulose to prepare the nano cellulose, the operation is simple, the reaction conditions are mild, the energy consumption is low, the separated and recycled reaction solution can be recycled, the environmental pollution is reduced, and a new pathfor industrial production of the nano cellulose is provided.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Preparation method of cyclopropane compounds
InactiveCN103193582AHigh yieldHigh industrial potentialHydrocarbon by hydrocarbon and non-hydrocarbon condensationDiiodomethaneEther
The invention discloses a preparation method of cyclopropane compounds. The structural formula of the cyclopropane compounds is shown in a formula I. According to the preparation method, olefins shown as a formula II have cyclopropanation reaction under the actions of a methylene transfer agent and an additive to generate cyclopropane compounds shown as the formula I, wherein the methylene transfer agent is a mixture of diethylzinc and diiodomethane, and the additive is a mixture of acid and ether. According to the preparation method provided by the invention, olefins with different structures are taken as substrates, and the mixture of diethylzinc solution and diiodomethane is taken as the methylene agent, so that the cyclopropane compounds are finally obtained with high yield under the synergistic effect of catalytic amount of trichloroacetic acid and equivalent amount of 1, 2-dimethoxyethane. The preparation method is mild and safe in reaction conditions, easy for large-scale operation, wide in the using range of the substrates and high in yield and has great industrialization potential.
Owner:INST OF CHEM CHINESE ACAD OF SCI
Lubricating oil biodegradation accelerant and preparation method thereof
ActiveCN112759612ALow priceImprove degradation rateGroup 5/15 element organic compoundsAdditivesIsopropylBenzyl group
The invention provides a lubricating oil biodegradation accelerant and a preparation method thereof. The lubricating oil biodegradation accelerant is a compound shown as a formula I, wherein X is phosphorus or boron, R1 is one or more of methyl, isopropyl, 2-methyl propyl, 1-methyl propyl, benzyl and hydrogen, and R2 is selected from C8-C18 alkyl. When the compound as shown in the formula I is used as a biodegradation accelerant, the biodegradation rate of lubricating oil can be effectively increased. The compound is low in synthesis raw material price, mild in reaction, suitable for large-scale industrial production and good in industrial development potential.
Owner:CHINA PETROLEUM & CHEM CORP +1
Combined pretreatment method for efficiently separating bagasse biomass components
InactiveCN102180994BEfficient and reliable methodNo pollution in the processBiofuelsFermentationAlkaline waterHemicellulose
The invention discloses a combined pretreatment method for efficiently separating bagasse biomass components, which mainly comprises the following steps: preimpregnating in dilute sulfuric acid; carrying out steam explosion treatment; washing with hot water; extracting; and carrying out enzymolysis. In the combined pretreatment method disclosed by the invention, on the basis of different physicochemical properties and structural features of the three components (hemicellulose, cellulose and lignin) in the bagasse, the component hemicellulose is sufficiently degraded and separated by dilute acid preimpregnation-steam explosion pretreatment, thereby reserving most of the cellulose and lignin; and the lignin is extracted by using a lower alcohol-alkaline water system, leaving high-cellulose-content residues. On the premise of low concentration of the added enzyme, the invention obviously increases the enzymolysis rate, and raises the conversion rate and comprehensive utilization rate of the bagasse biomass resource.
Owner:GUANGZHOU YOURUI BIOSCI
A kind of preparation method of benzofuranocoumarin compound
The invention discloses a preparation method of a photoactive benzofuranocoumarin compound. The photoactive benzofuranocoumarin compound is the compound shown in formula I; the enantioselectivity of the compound shown in formula I is as high as 95-99%. The photoactive benzofuranocoumarin skeleton of the present invention contains two chiral centers, adopts a 1,4-addition reaction strategy, uses a common and easily available chiral base as a catalyst, and uses 3-acylcoumarins of different structures, Benzofuranimine is used as a substrate to synthesize a photoactive benzofuranocoumarin compound containing two chiral centers; this method has low raw material prices, simple operation, low equipment requirements, environmental friendliness, and operator Safety, mild reaction conditions, high yield, high enantioselectivity, wide range of substrates, and great industrialization potential.
Owner:GUANGZHOU UNIVERSITY OF CHINESE MEDICINE
A kind of preparation method of orientation alignment barium titanate nanofiber
InactiveCN105506783BHigh crystallinityHigh purityInorganic material artificial filamentsElectro-spinningFiberElectrical conductor
Owner:WUHAN UNIV OF TECH
Synthesis method of drug intermediate oxazolidinedione compound
InactiveCN104672161AHigh yieldBroad application prospectsOrganic chemistryOxazolidinedioneAlkoxy group
The invention provides a synthesis method of an oxazolidinedione compound represented by formula (I) shown in the specification. The method comprises steps as follows: a compound represented by formula (II) shown in the specification, a compound represented by formula (III) shown in the specification and a compound represented by formula (IV) shown in the specification have a reaction in a solvent in the carbon dioxide atmosphere in the presence of a catalyst, a base and an aid, so that the oxazolidinedione compound represented by formula (I) is obtained; R1 and R2 are H, C1-C6 alkyl groups, C1-C6 alkoxy groups or halogens respectively and independently. According to the method, the good technical effect is realized through combination and cooperation of proper catalyst, base, aid and solvent systems, and the method has very broad market application prospect in the field of drug intermediate synthesis.
Owner:北京民康百草医药科技有限公司
A kind of preparation method of composite ultrafiltration membrane containing polyelectrolyte
ActiveCN111482095BPromote complexationImprove throughputMembranesUltrafiltrationPolyelectrolyteOrganic solvent
The invention relates to a method for preparing a polyelectrolyte-containing composite ultrafiltration membrane. Scrape the membrane on a glass plate with liquid solution and immerse it in a gel water bath to prepare a polyelectrolyte-containing composite ultrafiltration membrane in one step. The advantages of the present invention are: on the one hand, the polyelectrolyte is uniformly dispersed in the polymer membrane matrix without agglomeration; on the other hand, the hydrophilicity and porous structure of the polyelectrolyte can fine-tune the hydrophilicity and pore structure of the ultrafiltration membrane , while ensuring a high interception, the water flux is greatly improved, and has great potential for industrialization.
Owner:DONGHUA UNIV
Synthetic method of fluorene fluoride compound
PendingCN112592263AHigh yieldGreat potential for industrializationOrganic compound preparationCarbonyl compound preparationChemical synthesisReaction temperature
The invention relates to the technical field of organic chemical synthesis, and in particular, relates to a synthetic method of a fluorene fluoride compound, wherein the synthetic method of the fluorene fluoride compound comprises the following steps: S1, adding an organic solvent into a reaction kettle, adding a compound represented by a formula (I) and a fluorinating agent into the reaction kettle, and uniformly stirring and mixing; S2, sequentially adding an auxiliary agent and a reaction solvent into the mixture obtained in the step S1; and S3, setting the reaction temperature and the reaction time of the reaction kettle, continuously stirring while reacting, naturally cooling the product to room temperature after the reaction is completed, filtering, fully washing with a saturated sodium carbonate aqueous solution, adding chloroform, extracting for 2-3 times, merging organic phases, drying with anhydrous sodium sulfate, concentrating under reduced pressure, enabling the obtained residue to pass through silica gel column chromatography, and leaching the mixed solution of acetone and petroleum ether to obtain a compound represented by a formula (II). According to the method, thefluorinating agent, the auxiliary agent and the reaction solvent are comprehensively selected and cooperated, so that the target product can be obtained at high yield.
Owner:YANCHENG TEACHERS UNIV
A kind of method for preparing 1,5-aminoalcohol
ActiveCN104974049BAchieving Convergent SynthesisImprove resource utilization efficiencyOrganic compound preparationOrganic grignard reactionsAlcoholGrignard reagent
The invention discloses a method of preparing 1,5-amino alcohol, wherein the method includes a following step of performing a three-component reaction to an imine represented as the formula II, a Grignard reagent represented as the formula III, a catalyst, an oxidation agent and an additive in a solvent to obtain the 1,5-amino alcohol which is represented as the formula I. The invention achieves simplified synthesis of the 1,5-amino alcohol, wherein the ratio of diastereoisomer of the 1,5-amino alcohol can reach 8:1 and the ratio can reach 99%. The raw materials are low in cost and easy to obtain. The method is mild in reaction conditions, is simple in operations and has an industrial production potential.
Owner:INST OF CHEM CHINESE ACAD OF SCI
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