3427 results about "Acetic acid" patented technology

The invention provides an acetylacetone-based composite thermal stabilizer which is a mixture obtained by mixing zinc acetylacetonate, calcium acetylacetonate or magnesium acetylacetonate and hydrotalcite pro rata. The composite thermal stabilizer is suitable for chloride-containing high polymer, such as polyvinyl chloride, chlorinated polyethylene, chlorinated polyvinyl chloride, copolymer of vinyl chloride-ethylene or copolymer of vinyl chloride-vinyl acetate, has better thermal stability, prolongs the thermal aging time of the chloride-containing high polymer, and overcomes the shortcomings of poor long-term performance of single stabilizer of zinc acetylacetonate, poor transparency of stabilizer of calcium acetylacetonate, and poor initial colorability of stabilizer of hydrotalcite. The composite thermal stabilizer has low cost, good initial colorability, excellent long-term performance and good transparency, and is an efficient composite thermal stabilizer.

The invention provides a Bi-BDO fermentation pH dissolved oxygen dynamic optimization method based on an online Raman spectrum, belongs to the technical field of biological fermentation process control, and aims to solve the problems of unstable process and low efficiency caused by fermentation control lag and incapability of sensing the real metabolic state of cells in the prior art. The method comprises the following steps: acquiring the concentrations of a target product BDO and key byproducts such as acetic acid and ethanol in the fermentation liquor in real time through an online Raman spectrum; according to the method, a metabolic stress index is originally proposed and constructed, the index is obtained by performing weighted operation on the instantaneous generation rate of the by-product and the target product, and the index is used for quantitatively characterizing the intrinsic metabolic stress level of the cells in real time. The control strategy of maintaining the metabolic stress index in the preset optimal stable interval is taken as a core control strategy, the conversion from passive response to active prediction in the fermentation process is realized, and the yield, the stability and the batch repeatability of Bi-BDO production are remarkably improved.

The invention relates to a crown ether covalent organic framework material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a crown ether monomer and an amino monomer in an o-dichlorobenzene solvent, adding a catalyst acetic acid aqueous solution, and uniformly dispersing to form a reaction solution; the method comprises the following steps: freezing a reaction solution through a liquid nitrogen bath, vacuumizing, filling nitrogen, carrying out a heating reaction, and carrying out post-treatment operations such as washing and drying on a reaction product, so as to obtain the crown ether covalent organic framework material BADT-DB18C6-COF. The crown ether covalent organic framework material is formed by condensation of a crown ether aldehyde monomer and an amino monomer, the crown ether monomer is 4, 4 ', 4' ', 4 '''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde, and the crown ether monomer is 4, 4 ', 4' ', 4'''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde. The amino monomer is 4 ', 5'-bis (4-aminophenyl)-[1, 1 ': 2', 1 ''-terphenyl]-4, 4''-diamine. The crown ether covalent organic framework material BADT-DB18C6-COF prepared by the invention is mainly used as an adsorbent, is used for adsorbing and recovering uranium, thorium and americium ions from a solution, shows good adsorption capacity on radionuclides U-238, Th-232 and Am-243, and is particularly suitable for the field of spent fuel post-treatment in the nuclear industry.

The invention provides a preparation method of medicinal liquor and application of the medicinal liquor in preparation of analgesic and anti-inflammatory products, and relates to the technical field of medicines. The preparation method comprises the following steps: (1) crushing; (2) extracting; (3) standing and separating; and (4) freezing and filtering to obtain the medicinal liquor. In the preparation process, traditional Chinese medicine components are extracted through the steps of batch crushing, mixed extraction, standing, freezing and separation of supernate and suspension in different separation modes to obtain the medicinal liquor, and the medicinal liquor can better inhibit pain caused by thermal stimulation and chemical substances and has a better analgesic effect; the traditional Chinese medicine composition can inhibit capillary permeability increase caused by acetic acid, has a better effect of inhibiting inflammation exudation, and has remarkable analgesic and anti-inflammatory effects.

The invention relates to a preparation method and application of a porous material for preparing methanol through carbon dioxide adsorption and conversion. When the material is prepared, firstly, 4, 4 '4' '-(1, 3, 5-triazine-2, 4, 6-trimethylene) triphenylamine and 1, 2-acenaphthequinone are treated in a mixed solvent containing dioxane / acetonitrile / 6M acetic acid, and AT-COF is obtained; further synthesizing by adopting an impregnation method to obtain IrRu-COF; and finally, uniformly mixing the active gamma-aluminum oxide and the IrRu-COF material to form a carrier dispersion liquid, and then carrying out PEI loading, vacuum impregnation, washing and drying to obtain the PEI functionalized gamma-Al2O3 / COF composite catalyst. The technical closed loop from low-concentration CO2 capture to solar driven conversion is realized, the process flow is simple, and the energy consumption is low.

The invention relates to the technical field of microorganisms, in particular to a culture medium and a method for culturing Ackermania muciniphila for activating Amuc-1260 by using lambda-carrageenan as a carbon source, according to the culture method, the lambda-carrageenan is used for replacing a traditional carbon source, thallus growth and proliferation can be remarkably promoted, the effect is optimal under the condition of 2.00 g / L, and the culture cost is low. Compared with the conventional carbon source (glucose), the carbon source is improved by 92.91%. Further research finds that the lambda-carrageenan can induce the Akk bacteria to up-regulate the expression of glycoside hydrolase such as Amuc-1260 and enhance the activity of pathways such as glycosaminoglycan degradation, amino acid metabolism and insulin signals, so that the metabolic adaptability and energy utilization efficiency of the bacteria are improved. Meanwhile, the Akk bacteria secrete more functional short-chain fatty acids such as acetic acid, propionic acid and the like under the condition, and have the effects of regulating intestinal health and maintaining metabolic homeostasis. The invention provides a new theoretical basis and technical support for large-scale culture of Akk bacteria and development of a metabiotic product.

The invention discloses a fermentation medium for regulating and controlling a clostridium aerovorans target product and a fermentation method of the clostridium aerovorans target product. The medium comprises a basic component and a regulating component, the basic components comprise ammonium chloride, potassium chloride, magnesium sulfate heptahydrate, sodium chloride, monopotassium phosphate, yeast powder, calcium chloride dihydrate, sodium selenite, nickel chloride hexahydrate, biotin, folic acid, pyridoxine hydrochloride, thiamine, riboflavin, nicotinic acid, D-calcium pantothenate, cobalamin, para aminobenzoic acid and lipoic acid; the adjusting component comprises sodium tungstate, ferrous sulfate and sodium molybdate, sodium tungstate and ferrous sulfate have a forward adjusting effect on increasing the yield of acetic acid, ethanol and butanol in the target product, and sodium molybdate has a reverse adjusting effect on the target product. By optimizing the proportion of trace elements in the culture medium, the clostridium metabolism efficiency is improved, synthesis of a target product is regulated and controlled, and the method is particularly suitable for industrial production of acetic acid, ethanol, butanol and the like.

The invention relates to the field of foaming materials, in particular to a low-solvent-residue expandable polystyrene material and a preparation method thereof. The expandable polystyrene material with low solvent residue comprises the following raw materials in percentage by weight: 0.35-0.45% of a free radical initiation system, 0.35-0.45% of S, S, S, S, S, S, S, S, S, S, S, S, S, S, S According to the present invention, the material comprises, by weight, 0.1-0.15% of S, S '-bis (alpha, alpha'-dimethyl-alpha ''-acetoxy) trithiocarbonate, 0.15-0.2% of ascorbic acid, 0.1-0.2% of a nucleating agent, 0.2-0.3% of a suspending agent, 0.001-0.003% of an emulsifier, 5-6% of a foaming agent, 0.15-0.25% of a plasticizer, 0.001-0.002% of hydroxyethyl cellulose, 0.05% of sodium phosphate, 0.1-0.2% of zinc stearate, and 0.1-0.2% of glyceryl stearate, the obtained material has low solvent residue, meets food safety requirements, and is suitable for food packaging.

The invention discloses a method for synthesizing electronic-grade ethyl acetate through catalytic esterification of acidic ion exchange resin, and belongs to the technical field of ethyl acetate preparation. The method comprises the following steps: mixing crosslinked polystyrene white balls and a swelling agent, and dropwise adding concentrated sulfuric acid for reaction to obtain S-PS resin; mixing an EDTA disodium salt saturated solution and a polyacrylic acid solution, adding a cross-linking agent and an emulsifier, and carrying out a cross-linking curing reaction to obtain EDTA microcapsules; the preparation method comprises the following steps: dispersing S-PS resin in a solvent, adding EDTA microcapsules, a dehydration condensation agent and a catalyst, reacting under the protection of inert gas, and filtering and recovering after the reaction is finished to obtain S-PS-EDTA resin; mixing glacial acetic acid, absolute ethyl alcohol and S-PS (at) EDTA resin for reaction, and filtering and collecting liquid after the reaction is finished; and rectifying the collected liquid to obtain the product. According to the method provided by the invention, metal impurities can be chelated in the synthesis process, and the electronic-grade ethyl acetate with high purity and low impurity content is produced.

The invention discloses a method for preparing high-purity nickel acetate from crude nickel carbonate in the technical field of nickel compound purification, which comprises the following steps: mixing the crude nickel carbonate with deionized water to obtain a suspension, and adding glacial acetic acid to react to obtain a nickel acetate solution; then a specially-made hierarchical-pore titanium silicalite molecular sieve loaded bimetallic nanocluster material is added for purification treatment, the material is obtained through precise preparation, the method comprises the steps of carrier modification, bimetallic loading, hydrophobic modification, activation balance and the like, and the material has excellent impurity adsorption capacity and chemical stability; carrying out concentration crystallization and solid-liquid separation on the purified solution to obtain wet nickel acetate crystals; the mother liquor is subjected to adsorption treatment again, crystals in the mother liquor are recycled, and finally all the crystals are combined and dried to obtain a high-purity nickel acetate product. The process is simple and efficient, the purity of the prepared nickel acetate exceeds 98.5%, the content of each impurity is superior to the industrial standard, and the mother liquor can be recycled, is environment-friendly and is suitable for industrial production.

The invention discloses a La2O3-ZnO-NiO / ZrO2 oxygen carrier as well as a preparation method and application thereof, and belongs to the technical field of ammonia decomposition. According to the technical scheme, the method comprises the following steps: 1) synthesis of a ZrO2 carrier: adding NH3.H2O into a zirconyl nitrate solution to induce precipitation; 2) preparation of La2O3 / ZrO2: adding lanthanum nitrate hexahydrate and urea to obtain a precipitate, drying the precipitate, and finally calcining the precipitate; 3) preparation of La2O3-ZnO / ZrO2: adding zinc nitrate hexahydrate and urea, standing to obtain a precipitate, drying and calcining; and 4) preparation of La2O3-ZnO-NiO / ZrO2: adding NH3.H2O, then adding nickel acetate and thiourea, reacting, drying, and calcining twice to obtain the target product. Lattice oxygen in the oxygen carrier is used for catalytic oxidation of ammonia decomposition, the oxygen carrier can be recycled for multiple times, and the method is suitable for industrial application in the future.

The invention relates to the technical field of plant polysaccharide extraction, in particular to a process for synergistically extracting rape pollen polysaccharide by a compound enzyme, which comprises the following steps: crushing rape pollen to 200-300 meshes by pulse airflow, performing microwave-ultrasonic degreasing by using a 85% ethanol solution, mixing with an acetic acid-sodium acetate buffer solution with the pH value of 4.8, and performing ultrasonic extraction to obtain a crude extract; the method comprises the following steps: adding a compound enzyme system which is immobilized by Fe3O4 (at) SiO2 nanoparticles by cellulase, pectinase, protease and beta-glucosidase according to a mass ratio of 2: 1: 1: 0.5, carrying out enzymolysis for 4 hours in a 50 DEG C constant-temperature water bath and a 15V / cm pulsed electric field, carrying out enzyme deactivation on enzymatic hydrolysate, carrying out gradient ethanol precipitation, carrying out ultrafiltration deproteinization, and carrying out vacuum pulsation freeze drying to obtain the polysaccharide. According to the method disclosed by the invention, the cell wall breakage rate and the enzymolysis efficiency are improved through pulsed airflow crushing, magnetic nano immobilized enzyme and pulsed electric field assistance, the polysaccharide yield reaches 7.32%, the purity is 91%, the beta-glucosidic bond proportion and the antioxidant activity are remarkably improved, the enzyme can be recycled and reused, the drying time is shortened, and efficient and low-consumption extraction is realized.

The invention belongs to the field of microorganisms, and relates to bacillus velezensis A118 and application thereof. The bacillus velezensis A118 disclosed by the invention can resist saline and alkaline, and has a relatively good inhibition effect on colletotrichum capsici. The bacillus velezensis A118 disclosed by the invention also has relatively strong capability of producing cellulase, amylase, protease and indole-3-acetic acid (IAA) and has a relatively good growth promoting effect on chilies, and a fungicide prepared from the biocontrol bacterium does not cause pollution to the ecological environment in a use process and is pollution-free. By using the biocontrol bacterium disclosed by the invention, the dosage of other chemical pesticides can be reduced, the prevention and control cost of pepper diseases is reduced, the pepper growth is promoted, and the biocontrol bacterium has a good popularization value.

The invention discloses clostridium and application thereof in fermentation production of alcohol, and belongs to the technical field of industrial microorganisms. The clostridium is a carbon monoxide eating clostridium strain GG6, and is preserved in the China General Microbiological Culture Collection Center (CGMCC), the preservation number is CGMCC No.34975, and the preservation time is June 23, 2025. The clostridium is a carbon monoxide eating clostridium strain GG6 which is preserved in the China General Microbiological Culture Collection Center (CGMCC), the preservation number is CGMCC No.34975, and the preservation number is CGMCC No.34975. The carbon monoxide eating clostridium GG6 is obtained by enriching tail gas flue sediments of a coal chemical plant through an abundant culture medium, evolving a screening culture medium and sorting single bacteria, the bacterial strain is fermented by taking synthesis gas (CO / H2 / CO2) as raw material gas to generate acetic acid, ethanol, butyric acid and butanol, the thallus biomass OD600 is more than or equal to 6, the concentration of produced ethanol is more than or equal to 10g / L, the concentration of produced butanol is more than or equal to 2.5 g / L, and the concentration of produced butanol is more than or equal to 2.5 g / L; and commercialized implementation of butanol production through gas fermentation is facilitated.

The invention provides a clostridium endophyllum engineering bacterium as well as a construction method and application thereof, and belongs to the technical field of biology, compared with a wild type strain, the clostridium endophyllum engineering bacterium can only produce acetic acid in a low-pH environment under the condition of taking CO2 and H2 as raw materials, and does not generate by-products such as ethanol, lactic acid, 2, 3-butanediol and the like. Besides, the fermentation liquor of the clostridium endophyllum engineering bacteria can be directly used as an acidic substrate to adjust the pH value of downstream yeast fermentation liquor, meanwhile, automatic addition of a carbon source is achieved, zero addition of inorganic salt in the cascade conversion process from CO2 and H2 to grease or yeast protein is achieved, and the economical efficiency and environmental friendliness of the whole process are improved.

The invention relates to the field of coatings, and discloses a biomass-based oil-resistant coating and a preparation method thereof, the coating comprises an additive solution, a paraffin solution and gallic acid; the paraffin solution is obtained by dissolving paraffin in absolute ethyl alcohol; a preparation method of the additive solution comprises the following steps: mixing chitosan powder and an acetic acid aqueous solution to prepare a chitosan solution, ultrasonically dispersing functionalized montmorillonite in deionized water to prepare a suspension, then uniformly mixing the chitosan solution and the suspension, adding modified phytic acid prepared by grafting phytic acid and ethylene glycol diglycidyl ether, and stirring to react; the functional montmorillonite is prepared by modifying modified montmorillonite with titanium dioxide and zinc oxide, then activating the modified montmorillonite with 3-aminopropyltriethoxysilane and succinic anhydride, and then carrying out a ring-opening reaction with glycidyl neodecanoate. The coating prepared by the invention has high water resistance, the Kit oil-proof grade is kept at grade 12, and the oil-proof performance of the coating is greatly improved. Meanwhile, the antibacterial performance, the tensile index and the ultraviolet aging resistance are relatively high.

Compositions for delivering ketone bodies to a subject include one or more beta-hydroxybutyrate salts, one or more acetoacetate salts, beta-hydroxybutyric acid, and optionally acetoacetic acid. The compositions may optionally include one or more ketone body esters, such as one or more beta-hydroxybutyrate esters and / or one or more acetoacetate esters. An example composition contains about 2% to about 98% on a molar basis of the one or more beta-hydroxybutyrate salts and the one or more acetoacetate salts, about 2% to about 98% on a molar basis of the beta-hydroxybutyrate free acid and optionally the acetoacetate free acid, and optionally about 2% to about 98% on a molar basis of one or more ketone body esters.

The invention discloses an intelligent modified atmosphere packaging film with gas selectivity and pH / humidity double response as well as a preparation method and application of the intelligent modified atmosphere packaging film. The preparation method comprises the following steps: mixing thymol emulsion and graphene oxide dispersion liquid, and stirring and reacting at room temperature in a dark place to prepare graphene oxide-thymol; the preparation method comprises the following steps: dissolving chitosan in an acetic acid aqueous solution, then adding graphene oxide-thymol and a plasticizer, and carrying out ultrasonic dispersion treatment to form a film-forming solution; and carrying out film forming treatment on the film forming solution by adopting a casting method to prepare the intelligent modified atmosphere packaging film with gas selectivity and pH / humidity double response. The prepared intelligent modified atmosphere packaging film can be modified automatically, is uniform and stable in structure, high in encapsulation efficiency, close in coordination, good in antibacterial and antioxidant activity and excellent in mechanical property and gas barrier property, can realize selective adsorption of gas, controls release of thymol by responding to changes of the pH value and humidity in the environment, and has a good application prospect. The method has a good application prospect in the field of fruit and vegetable preservation.

The invention discloses a production method of a PET composite current collector base film with high mechanical property. The base film comprises an outer surface layer, a middle core layer and an inner surface layer, the outer surface layer is composed of PET, fumaric acid, hydroxyl-terminated polybutadiene and an antioxidant; the middle core layer consists of PET (Polyethylene Terephthalate), furandicarboxylic acid, an antioxidant and a stabilizer; the inner surface layer is composed of dimethyl terephthalate, ethylene glycol, spiro diol, ethylene glycol antimony and zinc acetate. The PET composite current collector base film prepared by the preparation method disclosed by the invention has relatively high mechanical properties.

The invention relates to the technical field of crude oil decalcification, in particular to a low-corrosivity crude oil decalcification agent and a preparation method thereof. The low-corrosivity crude oil decalcifying agent is prepared from the following raw materials: acetic acid, citric acid, modified chitosan, ethanol and deionized water, wherein the modified chitosan is prepared by synthesizing N-hydroxyacrylamide, performing sulfonation treatment, and grafting poly (N-isopropylacrylamide) with carboxymethyl chitosan. The preparation method comprises the following steps: adding deionized water and modified chitosan into a blending kettle, heating to 65-75 DEG C, stirring, sequentially adding acetic acid and citric acid, continuously stirring, finally adding ethanol, stirring, and cooling to obtain the decalcifying agent. The decalcifying agent can efficiently remove organic calcium, equipment corrosion is reduced through temperature-sensitive film forming, chelate is stable at high temperature, sewage COD is low, the decalcifying agent adapts to an existing electro-desalting process, and industrial application is easy.

The invention discloses application of a benzoquinone-based covalent organic framework material as a bifunctional photocatalyst in a photo-assisted lithium-air battery, and the benzoquinone-based covalent organic framework material is prepared by taking cyclohexanehexone octahydrate and 2, 3, 5, 6-tetraaminocyclohexane-2, 5-diene-1, 4-diketone as raw materials, ethylene glycol as a solvent and acetic acid as a catalyst through a hydrothermal reaction. And carrying out Schiff base reaction under the protection of nitrogen atmosphere. The benzoquinonyl covalent organic framework material has a large number of donor and acceptor units, has a wide visible light absorption range, can be used as a photo-assisted lithium-air battery bifunctional photocatalyst, greatly inhibits photon-generated carrier recombination, reduces the over-potential of a photo-assisted lithium-air battery, remarkably improves the battery assembly efficiency, and has a wide application prospect. And a new direction is provided for selection of photocatalysts in the field of lithium-air batteries.

The invention discloses a phosphate ester type composite binder for a sulfide battery, the phosphate ester type composite binder comprises a solute and a solvent, the solute comprises the following components in percentage by mass: 49.75%-88.5% of a binder, 9.5%-49.75% of phosphate ester and 0.45%-1.96% of silanol; the solvent is a non-polar solvent, and the mass ratio of the solute to the solvent is 1%: (10%-90%); the preparation method comprises the following steps: S1, placing the binder in a non-polar solvent, and heating and stirring until the binder is completely dissolved to obtain a solution A; s2, mixing a silane coupling agent with absolute ethyl alcohol, adjusting the pH value with acetic acid, and stirring to generate silanol; s3, silanol is added into the solution A, so that one end of silanol reacts with active hydrogen of the binder for bonding; and S4, adding phosphate into the solution A, so that the other end of the silanol is combined with a group of the phosphate to obtain a reaction solution with a binder-silanol-phosphate structure. According to the invention, stable combination of the binder and phosphate is realized through a silanol-mediated grafting structure, and the interface stability, the ionic conductivity and the mechanical strength are improved.

The invention discloses a compatible molybdenum-aluminum mixed acid etching solution which comprises the following components in percentage by mass: 4%-7% of nitric acid, 55%-65% of phosphoric acid, 17%-28% of acetic acid, 0.5%-3% of an oxidizing additive, 0.05%-5% of a metal corrosion inhibitor and 10%-20% of deionized water, and the oxidizing additive is ceric nitrate and at least one selected from sodium nitrate, potassium nitrate and ammonium nitrate; the etching liquid does not contain other organic components except for organic carboxylic acid and organic carboxylate. According to the compatible molybdenum-aluminum mixed acid etching solution, on the basis that ceric nitrate is introduced, the content of nitric acid is reduced, the nitrate ion concentration is increased by adding nitrate, the overall oxidation performance of an etching solution system is improved, the etching rate ratio of different metals is adjusted, CD-Bias is reduced, the etching dip angles of a molybdenum single layer and a molybdenum-aluminum laminated layer are controlled to be kept at 20-50 degrees, and the problem of aluminum thorns is solved. The invention further discloses a molybdenum-aluminum etching method based on the compatible molybdenum-aluminum mixed acid etching solution.

The invention discloses a water-soluble bornyl ester compound and application thereof, the structure of the water-soluble bornyl ester compound is as shown in general formula I, R is acetic acid 2-oxoethyl ester of organic heterocyclic ring, amino acid 2-oxoethyl ester, glycolate of amino acid, acetal of monodisperse polyethylene glycol chain, carbonate, ester or glycosyl; the compound is good in water solubility, the problems that borneol is difficult to dissolve in water and difficult to prepare can be well solved, and in an inflammatory depression animal model, the bornyl ester compound shows good anti-inflammatory, anti-depression and cerebral apoplexy treatment effects and has great application prospects.

The invention discloses a method for improving the crystallinity of a flexible covalent organic framework film through solvent heat treatment, and relates to the technical field of flexible functional film materials, and the method comprises the following steps: (1) synthesizing a COF film; (2) soaking the COF membrane in a triethylamine methanol solution to remove residual acidic components; and (3) putting the treated membrane into an acetic acid acetonitrile solution, and heating at 100 DEG C for 0.5-6 hours to improve the crystallinity of the membrane. According to the method, rearrangement of framework chain segments in a film body and enhancement of crystallinity are achieved through the mild two-step solution treatment step, the XRD diffraction intensity, the film body compactness and the structural orderliness of the COF film are remarkably improved, and meanwhile the flexibility and the mechanical property of an original film are kept.

The invention belongs to the technical field of synthetic biology, and particularly relates to recombinant escherichia coli for efficiently producing O-acetyl-L-homoserine as well as a construction method and application of the recombinant escherichia coli. According to the invention, CRISPR-Cas9 gene editing is combined with metabolic modification, so as to precisely integrate OAH biosynthesis key nodes: introducing and overexpressing a mutant metX gene at a genome pseudogene site to enhance the expression of homoserine acetyltransferase, knocking out byproducts such as poxB and mgsA to synthesize genes, and carrying out high-yield synthesis of OAH. Corynebacterium glutamicum thrA (anti-feedback inhibition), aspB and bacillus subtilis acsA-acuA genes (construction of an acetic acid switch) are introduced, gene expression of gltA, tpiA and the like is optimized to increase supply of precursors such as acetyl CoA and the like, and finally a stable strain without plasmids, antibiotics and inducers is obtained. The production cost is effectively reduced, and the method has the advantage of high genetic stability and shows a good application prospect in OAH industrial production.

The invention relates to the technical field of OLED (Organic Light Emitting Diode) manufacturing process etching processes, in particular to a silver etching solution for an OLED manufacturing process as well as a preparation method and application of the silver etching solution. The silver etching liquid comprises nitric acid, phosphoric acid, a buffer agent, a metal ion chelating agent and an ionic liquid inhibitor, the ionic liquid inhibitor comprises 1-butyl-3-methylimidazole phosphate, the metal ion chelating agent is selected from at least one of pyromellitic acid, diethylenetriamine pentaacetic acid and ethylenediamine tetramethylene phosphoric acid, and the buffer agent is selected from at least one of sodium chloride, sodium chloride and sodium chloride. The buffering agent comprises acetic acid, and all the components are prepared according to a specific mass ratio. The etching solution can balance the etching rate of silver and indium tin oxide, avoid silver residues and black spot defects, prolong the service life of the solution, reduce the use of a volatile buffer agent, adapt to the OLED fine manufacturing process, improve the product yield and reduce the production cost, and is suitable for etching of a metal substrate in the OLED manufacturing process.

A method for preparing 1,2-propanediol involves reacting propene with hydrogen peroxide in the presence of a catalyst mixture containing a phase transfer catalyst and a heteropolytungstate, in a liquid reaction mixture containing an aqueous phase with a maximum apparent pH of 6 and an organic phase. The process then involves separating the reaction mixture into an aqueous phase (Pa) containing 1,2-propanediol and an organic phase (Po); recycling at least part of the separated organic phase (Po) to the reaction; and recovering 1,2 propanediol from the separated aqueous phase (Pa). In the recovery, 1,2-propanediol is separated from the aqueous phase (Pa) by distillation and the apparent pH of the separated aqueous phase (Pa) is adjusted to at least 9 prior to the distillation to reduce the content of formic acid and acetic acid in the recovered 1,2-propanediol.

The invention discloses a polydopamine modified metatitanic acid type lithium ion sieve and a preparation method thereof, and belongs to the technical field of lithium ion sieves, the preparation method comprises the following steps: grinding and uniformly mixing lithium acetate dihydrate and titanium dioxide in an organic solvent, and calcining the mixture at 650-800 DEG C for 3-5 hours to prepare a Li2TiO3 precursor; the preparation method comprises the following steps: putting dopamine hydrochloride, aminated crown ether and a Li2TiO3 precursor into a tris (hydroxymethyl) aminomethane solution with the pH value of 8-9, carrying out a constant-temperature oscillation reaction, carrying out suction filtration, and drying at low temperature, so as to obtain the polydopamine modified metatitanic acid type lithium ion sieve. According to the lithium ion sieve, the adsorption effect on lithium ions can be improved, the lithium extraction efficiency is improved, and the problem of low adsorption capacity of a lithium ion sieve in the prior art is solved.

The invention provides a method for producing 4, 4 '-dichlorodiphenyl sulfone by continuous reaction of a microchannel reactor, which comprises the following steps: uniformly mixing thionyl chloride and aluminum chloride to obtain a solution A; uniformly mixing hydrogen peroxide and glacial acetic acid to obtain a solution B; a first feeding pump and a second feeding pump are adopted for conveying chlorobenzene and a solution A into a first silicon carbide micro-channel reactor for reaction, an outlet of the reactor is connected with a gas-liquid separator, through separation, a gas phase is used for preparing a byproduct hydrochloric acid, and a liquid phase is a chlorobenzene solution of 4, 4 '-dichlorodiphenyl sulfoxide; and continuously conveying the chlorobenzene solution of 4, 4 '-dichlorodiphenyl sulfoxide to the second silicon carbide microchannel reactor by adopting a third feeding pump, and meanwhile, conveying the solution B to the second silicon carbide microchannel reactor by adopting a fourth feeding pump for reaction to prepare 4, 4'-dichlorodiphenyl sulfone. Compared with the prior art, the micro-channel reactor is used for continuous production, the mass and heat transfer effect is good, impurity generation is effectively inhibited, and the reaction time is shortened.