935 results about "Isopropanolol" patented technology

The present disclosure provides a recombinant yeast host cell having a plurality of native and / or heterologous enzymes that function in an engineered metabolic pathway to convert fructose-6-phosphate to acetyl-coenzyme A. The recombinant yeast host cell can be used, for example, in a process for making acetyl-coenzyme A, acetone and / or isopropanol. The plurality of native and / or heterologous enzymes is activated, upregulated, or overexpressed. The plurality of native and / or heterologous enzymes comprises a phosphoketolase; and optionally an acetate kinase; and / or a phosphotransacetylase. The recombinant yeast host cell comprises at least one of: at least two copies of a heterologous nucleic acid molecule encoding the phosphoketolase; a native and / or heterologous enzyme that functions in an engineered non-oxidative pentose phosphate pathway, wherein the native and / or heterologous enzyme is activated, upregulated, or overexpressed; and / or a native and / or heterologous protein that functions in an engineered metabolic pathway to convert pantothenate into acetyl-coenzyme A, wherein the native and / or heterologous protein is activated, upregulated or overexpressed and comprises at least one of: FEN2 or CAB1.

The invention relates to a high-stability bronze powder pigment and a preparation method and application thereof.The preparation method comprises the following steps that copper-zinc alloy coarse powder, stearic acid and a dissolved compound passivator are taken and subjected to ball milling in the nitrogen atmosphere, and a ball milling product is screened, washed and subjected to suction filtration to obtain an amino-functionalized passivated base material; the preparation method comprises the following steps: dispersing SiO2 in anhydrous isopropanol to obtain a reaction system, adding deionized water and a catalyst, dissolving tetraethoxysilane and phenyltriethoxysilane in anhydrous isopropanol, slowly dropwise adding, carrying out a heat preservation reaction, and carrying out suction filtration and washing to obtain a phenyl modified SiO2 coated intermediate; the preparation method comprises the following steps: dispersing a compound stabilizer in anhydrous isopropanol to obtain a mixed system, heating and stirring, dissolving the compound stabilizer in anhydrous isopropanol, dropwise adding into the mixed system, reacting, centrifuging, washing, and drying in vacuum to obtain the bronze powder pigment. The bronze powder pigment disclosed by the invention has excellent oxidation resistance, chemical corrosion resistance and long-term storage stability, and can keep the natural color gloss of metal to the greatest extent.

The invention relates to a dispersing agent for garnet type solid electrolyte and a preparation method thereof, a special powder dispersing agent for dispersing garnet type solid electrolyte (LLZO, Li7La3Zr2O12) in an ethanol or isopropanol system is a polycarboxylic acid-polyether colorless transparent viscous liquid copolymer, and the copolymer is anchored on the surface of powder particles through the strong adsorption effect of carboxyl, so that the dispersing agent can be used for dispersing the garnet type solid electrolyte (LLZO, Li7La3Zr2O12) in an ethanol or isopropanol system. Meanwhile, the polyether chain segment realizes solvent compatibility and steric hindrance effect, the preparation method for the dispersing agent is a controllable free radical polymerization method and specifically comprises dozens of specific steps and conditions, and the dispersing agent has the advantages that the grinding particle size of the garnet type solid electrolyte can be effectively reduced, stable dispersion of powder in slurry is realized, and the dispersing effect is good. Powder agglomeration is inhibited, and the grinding efficiency is improved, so that the mass production requirement of the high-safety solid-state lithium ion battery is met.

The invention relates to the technical field of biology, in particular to an L-amino acid synthesis system and application. According to the L-amino acid synthesis system and application provided by the embodiment of the invention, in the presence of coenzyme NAD < + >, isopropanol is catalyzed by isopropanol dehydrogenase to generate acetone, and NAD < + > is reduced into coenzyme NADH; in the presence of coenzyme NADH, the leucine dehydrogenase mutant utilizes NH3 generated by ammonia water volatilization to perform asymmetric reductive amination on a prochiral alpha-keto acid compound, the NADH is oxidized into NAD +, the catalytic efficiency of asymmetric reductive amination of the leucine dehydrogenase mutant on the prochiral alpha-keto acid compound is improved, the circulating speed of the coenzyme NADH and NAD + is increased, and the catalytic activity of the leucine dehydrogenase mutant on the prochiral alpha-keto acid compound is improved. The catalytic efficiency of asymmetric reductive amination of the leucine dehydrogenase is favorably improved.

The invention discloses a preparation method based on hollow double-shell nanofiller and application of the hollow double-shell nanofiller in preparation of a transparent heat-insulating coating, and belongs to the field of heat-insulating coatings. The preparation method comprises the steps that firstly, PMMA-coated TiO2 core-shell sphere powder is prepared; ultrasonically dispersing the prepared PMMA-coated TiO2 core-shell sphere powder into an aqueous solution of isopropanol, and adding acetic acid to adjust the pH value, so as to prepare a core-shell sphere PMMA-coated TiO2-coated SiO2; calcining the core-shell sphere PMMA (at) TiO2 (at) SiO2 to prepare a TiO2 (at) SiO2 sphere with a double-shell hollow structure; the preparation method comprises the following steps: mixing waterborne polyurethane, a solvent, a thickening agent, a curing agent, an auxiliary agent and DHTS, standing, and discharging bubbles to prepare the hollow double-shell nanofiller. The hollow double-shell nanofiller disclosed by the invention can realize the effects of high transmittance, heat insulation and fog prevention.

The invention provides a flexible electromagnetic shielding film and a preparation method thereof. The preparation method comprises the following steps: mixing metal gallium and metal indium in a preset proportion to prepare a gallium-indium alloy; the preparation method comprises the following steps: putting a preset mass of gallium-indium alloy into an isopropanol solution, and treating through an ultrasonic cell disruption system to obtain a liquid metal particle suspension; stirring magnetic functional nanoparticles, an electrostatic spinning high-molecular elastomer and a solvent at normal temperature for a preset time to obtain an electrostatic spinning homogeneous solution; treating the electrostatic spinning homogeneous solution by adopting an electrostatic spinning process to obtain a magnetic nanofiber membrane; and spraying the liquid metal particle suspension onto the magnetic nanofiber membrane by adopting an electrostatic spraying process to obtain the flexible electromagnetic shielding film. According to the flexible electromagnetic shielding film and the preparation method thereof, the problem that the stability of an existing shielding material is reduced under the stretching effect can be solved.

The invention provides a rapid detection kit for bursaphelenchus xylophilus and a method and application thereof.The detection kit comprises a fluorescent RAA dry powder reagent premixed with primer probes, the primer probes for rapidly detecting the bursaphelenchus xylophilus based on RAA are designed and screened, and a primer and probe set for specifically amplifying the ITS gene of the bursaphelenchus xylophilus is obtained; no cross reaction with the bursaphelenchus mucronatus is caused; meanwhile, the kit comprises a lysis solution for rapidly extracting the DNA of the pine wood nematode suspension, and the lysis solution contains quaternary ammonium salt, isopropanol and DMSO, so that the DNA extraction quality and efficiency are remarkably improved. The bursaphelenchus xylophilus detection kit provided by the invention is strong in detection specificity, high in sensitivity, simple to operate and portable, and can rapidly detect bursaphelenchus xylophilus within 30 minutes under field conditions.

The invention belongs to the technical field of optical lenses. The invention relates to a butterfly pupil escape compound eye bionic high-color-gamut nylon sunglass lens which comprises a lens body and a coating. Wherein the lenses are made of nylon resin; the coating is prepared from the following raw materials in parts by weight: 25 to 40 parts of tetraethoxysilane; 10 to 20 parts of phenyl trimethoxy silane; 4.0 to 8.0 parts of dimethyl dimethoxy silane; 2.0 to 4.0 parts of an MOF color enhancing agent; 20 to 30 parts of isopropanol; 11 to 22 parts of deionized water; and 1.0-3.0 parts of glacial acetic acid. A coating is prepared from a self-made MOF color enhancing agent through molecular design through formula optimization design, and the nylon resin lens is coated with the coating, so that the butterfly pupil escape compound eye bionic high-color-gamut nylon sunglasses lens is obtained. The butterfly pupil escape compound eye bionic high-color-gamut nylon sunglass lens effectively solves the problem that the color identification degree is low after the butterfly pupil escape compound eye bionic high-color-gamut nylon sunglass lens is blocked by 45-90% of light rays at present.

The invention relates to the technical field of hydrogen storage material preparation, in particular to a preparation method of a nano magnesium-based hydrogen storage material based on parameter optimization. The preparation method comprises the following steps: preparing a solution A from functionalized graphene powder, tetrabutyl titanate and isopropanol, preparing a solution B from scandium nitrate monohydrate and isopropanol, mixing A and B to obtain gel, grinding, calcining, analyzing a state difference index, optimizing feedback error control temperature to obtain powder A by mixing a catalyst and magnesium powder, heating, preserving heat, cooling, preserving heat and cooling the powder A to obtain powder B, and preparing the graphene / scandium nitrate / magnesium powder composite material. And ball-milling the powder B to obtain the nano magnesium-based hydrogen storage material. According to the method, the influence of the heat transfer non-uniformity characteristic on the calcination treatment temperature error in the catalyst calcination process is analyzed, the temperature data at different time points are integrally divided, and the difference is analyzed, so that the influence of the non-uniformity characteristic on the feedback error analysis on the time interruption characteristic on the temperature data change is reduced; the capability of coping with the influence of the non-continuous difference of calcination treatment on feedback error analysis is improved, and the performance of the nano magnesium-based hydrogen storage material is improved.

The invention discloses a salt-resistant foam scrubbing agent for oilfield exploitation and a preparation method thereof, and belongs to the technical field of foam scrubbing agent preparation. The salt-resistant foam scrubbing agent for oilfield exploitation is prepared from the following components in parts by weight: 15 to 25 parts of a main surfactant, 5 to 10 parts of cocamidopropyl betaine, 0.1 to 0.6 part of a cosurfactant, 1 to 4 parts of EDTA (Ethylene Diamine Tetraacetic Acid) disodium, 0.05 to 0.12 part of nano silicon dioxide and 3 to 6 parts of isopropanol. The foam scrubbing agent prepared by the invention has excellent salt resistance and stability.

The invention discloses a preparation method of a metal-doped cobalt-based oxide material, which comprises the following steps: metal nitrate is dissolved in glycerol and isopropanol, a solvothermal method is adopted for reaction to obtain a reaction product, the metal in the metal nitrate comprises cobalt and at least one of nickel, copper, iron or molybdenum, the concentration of cobalt nitrate in the dissolved solution is 0.001-0.05 mM, and the concentration of cobalt nitrate in the solution is 0.01-0.05 mM; the concentration of metal nitrate except cobalt is 0.1-1 mu M; the reaction product is subjected to high-temperature calcination, the metal-doped cobalt-based oxide material with the microstructure being nanospheres with rough surfaces is obtained, the reaction temperature of the solvothermal method is 120-180 DEG C, and the reaction time is 3-6 h. The invention also discloses the metal element doped cobalt-based oxide material obtained by the preparation method and application of the metal element doped cobalt-based oxide material in electrocatalytic nitrate reduction synthesis of ammonia. The preparation method provided by the invention is simple, and the prepared metal-doped cobalt-based oxide material shows excellent electrochemical performance when applied to electrocatalytic nitrate reduction synthesis of ammonia.

The invention discloses a solid-state electrolyte and a solid-state lithium metal battery. A preparation method of the solid-state electrolyte comprises the following steps: preparing a Li1. 3Al0. 3Ti1. 7( PO4) (LATP) solid-state electrolyte by adopting a solid-phase sintering method; the preparation method comprises the following steps: dissolving InCl3 and polyacrylic acid (PAA) in isopropanol to form a colorless precursor solution; dripping the solution on the surface of the LATP solid electrolyte and coating by using a spin coater; and the coated and dried LATP is put into a tubular furnace to be sintered, and the In2O3 coated LATP is obtained. Through in-situ electrochemical reaction of indium oxide and lithium metal, an interface layer composed of a Li2O phase and a LixIn alloy is constructed. Wherein the Li2O phase has relatively low lithium ion migration energy barrier and electronic insulation capability; the LixIn alloy can improve the ion diffusion coefficient of the lithium side, and has very high affinity to lithium metal and LATP. According to the Li2O / LixIn interface layer prepared by the preparation method disclosed by the invention, tight contact between lithium metal and LATP is maintained, side reaction is avoided, interface ion transmission kinetics is improved, and uniform dendrite-free lithium deposition is realized.

The present invention provides a kind of detection method of thirteen kinds of related substance contents in vonoprazan fumarate, and high performance liquid chromatography is used for detection, and the chromatographic conditions are: the test solution and the reference solution are injected into the high performance liquid chromatograph, and the chromatographic conditions are: the chromatographic column adopts octadecyl bonded silica gel column; the ultraviolet detector is used, and the detection wavelength is 260nm; the injection volume: 10μl; the column temperature: 30℃‑40℃; the flow rate: 0.8ml / min‑1.0ml / min; the gradient elution method is used, and the mobile phase A: the solution of 0.02mol / L potassium dihydrogen phosphate solution adjusted to pH 8.0 with potassium hydroxide solution and isopropanol mixed with a volume ratio of 95:5; the mobile phase B: the mixed solution of acetonitrile and isopropanol with a volume ratio of 95:5. The method can be used to detect the contents of 13 kinds of related substances in vonoprazan fumarate, and high performance liquid chromatography is used for detection, and the method has high detection sensitivity, and the verification results show that the system applicability and specificity of this method meet the requirements, and the needs of drug production quality monitoring can be met.

The invention discloses a gastric signet-ring cell carcinoma biomarker and a detection kit thereof, belongs to the technical field of biological medicines, and particularly relates to the detection kit of the gastric signet-ring cell carcinoma biomarker, which comprises a total RNA (Ribonucleic Acid) extraction reagent, an RNA purification reagent, a cDNA (Complementary Deoxyribonucleic Acid) first strand synthesis premixing reagent, a rapid fluorescent quantitative premixing reagent (SYBR Green), nuclease-free double distilled water and a specific primer. The RNA purification reagent at least comprises isopropanol, chloroform and absolute ethyl alcohol; the specific primer comprises an upstream specific primer and a downstream specific primer. The detection kit for the gastric signet-ring cell carcinoma biomarker is high in RNA purification and recovery efficiency and excellent in specificity.

The invention discloses an anti-yellowing PVB (Polyvinyl Butyral) adhesive for laminated glass and a preparation method thereof, and relates to the technical field of adhesives. The yellowing-resistant PVB glue for the laminated glass has the advantages that the yellowing resistance is high; the modified PVB / nano silicon dioxide composite material is prepared from the following raw materials in parts by weight: 55 to 65 parts of modified PVB resin, 4 to 6 parts of modified nano silicon dioxide, 15 to 20 parts of dioctyl adipate, 0.5 to 1 part of a compound antioxidant, 0.3 to 0.8 part of an ultraviolet absorbent UV-327, 0.2 to 0.5 part of a silane coupling agent KH-560, 0.3 to 0.6 part of ethylene bis stearamide, 0.1 to 0.3 part of 2-benzimidazole methyl carbamate, 3 to 5 parts of tris (1-chloro-2-propyl) phosphate and 0.1 to 0.3 part of nano titanium dioxide. 5 to 8 parts of isopropanol; 0.8 to 1.2 parts of polycarbodiimide. The special modified PVB resin and the nano silicon dioxide are matched with the auxiliary agents such as the compound antioxidant, the anti-yellowing performance of the PVB glue for the laminated glass is remarkably improved through precise process preparation, the components have a synergistic effect, the process is controllable, the product performance is stable, and the cohesiveness is good.

According to the method, a polysaccharide derivative bonding type chiral chromatographic column with silica gel surface bonded amylose-tri (3, 5-dichlorophenyl carbamate) as a filler is adopted, a mixed solution of n-hexane and isopropanol is used as a mobile phase, the column temperature is 28-32 DEG C, the flow velocity is 1.1-1.3 ml / min, the column temperature is 20-30 DEG C, the column temperature is 20-30 DEG C, the column temperature is 20-30 DEG C, the column temperature is 20-30 DEG C, the column temperature is 20-30 DEG C, and the column temperature is 20-30 DEG C; an ultraviolet detector is adopted, the wavelength is 205-220 nm, and effective separation of the etomidate intermediate and the enantiomer thereof is achieved. The method is good in detection result accuracy and high in sensitivity, and compared with an existing analysis method, the method is better in separation effect, simpler in mobile phase composition, more durable in chromatographic column and lower in cost, so that a good guarantee is provided for quality control of the etomidate intermediate and etomidate.

The invention belongs to the technical field of organic synthesis, and particularly relates to a method for continuously synthesizing 2-chloropropane, which comprises the following steps: uniformly mixing preheated hydrogen chloride gas and vaporized isopropanol through a mixer, introducing into a fixed bed reactor filled with a solid catalyst, and contacting with the catalyst to start reaction to generate mixed gas containing 2-chloropropane; and carrying out gas-liquid separation on the mixed gas containing 2-chloropropane, and standing and layering the liquid phase to obtain the 2-chloropropane product on the upper layer. According to the method, the problem of continuous synthesis of 2-chloropropane is solved, the production efficiency is greatly improved, meanwhile, the problem that high-price special material equipment is needed in the reaction is solved, and the production cost is reduced. The problems of high reaction temperature, low selectivity and low yield are solved, the product purity of the reaction exceeds 99%, and the yield reaches more than 98.5%.

The present application discloses a cleaning agent, a cleaning method and a cleaning machine for cleaning 3D printed components, and relates to the field of 3D printing technology. Using alkaline inorganic compounds and water as the main raw materials of the cleaning agent, the alkaline inorganic compounds and esters can undergo saponification reaction to generate alcohols and carboxylates soluble in water, thereby achieving the purpose of cleaning. The use of traditional cleaning agents such as alcohol or isopropanol can be reduced or directly eliminated, thereby reducing costs and reducing the irritation of cleaning agents. At the same time, the use of flammable and explosive organic solvents such as alcohol is reduced, and the safety of operation is improved during the use and storage of cleaning agents.

The invention discloses chitosan-based conductive hydrogel and a preparation method thereof.The method comprises the steps that chitosan is added into isopropanol, after a primary reflux reaction, an aqueous solution of 2, 3-epoxypropyltrimethylammonium chloride is added, a secondary reflux reaction continues, and quaternary ammonium chitosan is prepared; the preparation method comprises the following steps: adding quaternary ammonium chitosan into an aqueous solution of acrylic acid, stirring and dissolving, adjusting the pH value of a system to 7, then adding an aqueous solution of polyvinyl alcohol, stirring uniformly, adding ammonium persulfate and N, N '-methylene bisacrylamide, stirring and fully dissolving to obtain a hydrogel precursor; and performing polymerization treatment on the hydrogel precursor, and soaking the hydrogel precursor in a mixed solution of potassium hydroxide and zinc acetate to prepare the chitosan-based conductive hydrogel. The preparation process is simple, and the problems of insufficient conductivity, weak mechanical property and insufficient stability of the biomass-based hydrogel are systematically solved through quaternization modification, a multi-crosslinking strategy and electrolyte post-treatment.

The invention discloses ethanol dehydrogenase, recombinant genetically engineered bacteria and application of the ethanol dehydrogenase in asymmetric reduction of prochiral carbonyl compounds, the ethanol dehydrogenase has good biological performance, heterologous expression in Escherichia coli engineering bacteria is achieved, intracellular coenzyme can be directly utilized when whole cells are adopted as a catalyst, and the catalyst has a good application prospect. Zero addition of the coenzyme is realized, the enzyme has the advantages of high activity, high stereoselectivity, wider substrate spectrum and the like, prochiral ketone compounds can be greenly and efficiently catalyzed to be converted into corresponding chiral alcohols, and the problems of low conversion rate, low yield, low e.e. Value, complex reaction process, more byproducts and the like in a traditional chemical method are solved. The ethanol dehydrogenase has good tolerance to isopropanol, and the isopropanol can be used as a hydrogen source to realize the circulation of coenzyme. And the byproduct acetone generated by the enzyme catalytic reaction and the isopropanol remaining in the reaction can be separated and recovered by a technical means, so that the production cost is greatly reduced.

The invention relates to a high-purity isopropanol purification method based on modified resin, which comprises the following steps: adding activated carbon into an isopropanol mixed solution, decolorizing the isopropanol mixed solution, carrying out primary impurity adsorption, and removing particulate matters and macromolecular impurities meeting activated carbon adsorption conditions in the isopropanol mixed solution. The method comprises the following steps: carrying out primary dehydration through a 4A molecular sieve, adding hydrogen-type strong-acid cation exchange resin and hydrogen-oxygen type strong-base anion exchange resin into an isopropanol mixed solution, and removing positive ions and negative ions in the isopropanol mixed solution; the macroporous alkalescence anion exchange resin of the styrene-divinylbenzene copolymer is added, so that the content of residual acid and alkali is lower than 10ppb. The ionic liquid is fixed on hydrogen type strong-acid cation exchange resin and hydrogen-oxygen type strong-base anion exchange resin, and alcohol, ketone and organic acid impurities are removed. And carrying out fractional rectification on the isopropanol mixed solution, and removing light and heavy components to obtain isopropanol with the purity not lower than 99.999%.

The present invention proposes a method for removing odor impurities from 1,2-hexanediol, and belongs to the field of purification technology. The method for removing odor impurities from 1,2-hexanediol comprises the following steps: 1) mixing 1,2-hexanediol and an entrainer to obtain a mixed material; the entrainer is one or more of pure water, methanol, ethanol, n-propanol, isopropanol and n-butanol; 2) transferring the obtained mixed material to an azeotropic distillation tower for azeotropic distillation, extracting an azeotrope of the entrainer and odor impurities at the top of the tower, and obtaining the deodorized 1,2-hexanediol in the tower bottom. The method provided by the present invention does not involve chemical reactions, and has a short production process, generates less solid waste, and has a high purity of the purified 1,2-hexanediol product.

The invention provides a glass cleaning agent as well as a preparation method, application and a use method thereof, and relates to the field of cleaning agents. The glass cleaning agent is prepared from the following components in percentage by mass: 0.025 percent to 0.1 percent of a chelating agent, 0.5 percent to 2 percent of an efficient cleaning agent, 0.05 percent to 0.2 percent of an alkaline cleaning agent, 2.5 percent to 10 percent of isopropyl alcohol, 2.5 percent to 10 percent of acetone, 0.05 percent to 0.2 percent of a phosphorus flame retardant and 77.5 percent to 94.375 percent of deionized water, the chelating agent comprises citric acid; the efficient cleaning agent is prepared from FC-3060 hydrofluoroether; the alkaline cleaning agent comprises sodium carbonate. The components of the glass cleaning agent are all selected from environment-friendly materials, the influence on the environment is small, harmful smoke or pungent smell is not generated in the using process, and the health of operators and the safety of the working environment are guaranteed.

The invention relates to the technical field of catalysts, and particularly discloses a Cu-based catalyst for preparing 1, 2-pentanediol and a preparation process of the 1, 2-pentanediol. The Cu-based catalyst used for preparing 1, 2-pentanediol comprises 6-72% of a copper salt, 20-70% of a carrier, 4-12% of a transition metal oxide and 4-12% of a polymeric nitrogen-containing organic ligand, and the polymeric nitrogen-containing organic ligand is polypyrrole or polyaniline. The preparation process of the 1, 2-pentanediol comprises the following steps: mixing furfural, isopropanol and a Cu-based catalyst for preparing the 1, 2-pentanediol, adding the mixture into a high-pressure reaction kettle, and reacting for 10-14 hours in a hydrogen atmosphere of 2.8-3.2 MPa and at the temperature of 145-155 DEG C under continuous stirring to obtain the 1, 2-pentanediol. According to the Cu-based catalyst, the combination effect between the carrier and Cu can be enhanced, so that active Cu loaded on the carrier is more stable in the reaction process, and the catalytic performance of the Cu-based catalyst is improved.

The invention provides a few-layer V2AlC MAX phase material and also provides a preparation method and application of the material, and the preparation method comprises the following steps: grinding and uniformly mixing vanadium powder, aluminum powder and graphite powder, and tabletting the mixed powder to obtain a solid A; roasting and grinding the solid A to obtain powder B; mixing sodium hydroxide, potassium hydroxide and the powder B, and performing high-temperature treatment to obtain powder C; the powder C is washed, subjected to suction filtration and dried and then mixed with isopropanol, nitrogen is introduced for heating treatment, and turbid liquid is obtained; and carrying out ultrasonic treatment on the turbid liquid, standing, centrifuging supernatant, washing and drying to obtain the few-layer V2AlC MAX phase material. The few-layer V2AlC MAX phase material with high catalytic activity is synthesized by using the molten alkali and the intercalator, the conversion rate of the few-layer V2AlC MAX phase material used for solvent-free catalysis of toluene reaches 20.83%, the selectivity of benzoic acid reaches 70.02%, and chlorine is not introduced into the obtained benzoic acid, so that the few-layer V2AlC MAX phase material can be applied to food and medicines.

The invention belongs to the technical field of azeotropic distillation and dehydration of isopropanol, particularly relates to an azeotropic distillation and dehydration method of industrial-grade isopropanol, and aims to solve the problems that the energy consumption of separation of isopropanol and solvents is high, the energy consumption is low and the like due to the fact that solvents such as benzene and cyclohexane are adopted for azeotropic distillation and dehydration in the conventional isopropanol dehydration process, but the boiling points of benzene and cyclohexane are close to those of isopropanol. In order to solve the problems that when diethyl ether is used as an azeotropic agent, the solvent is easily enriched at the tower top to form potential safety hazards, and when the solvents are used for azeotropic distillation, the requirements of electronic chemicals cannot be met, the following scheme is provided: the method comprises the following steps: S1, adding an industrial-grade isopropanol raw material into an azeotropic distillation tower; the azeotropic dehydrating agent disclosed by the invention is small in boiling point, high in ignition point, non-corrosive, low in price, good in safety and low in separation energy consumption, and has excellent application value and application prospect in industrial production and experiments, the used device is simple and easy to operate, the yield is high, and automatic production can be realized.

The present disclosure provides a method for preparing lutein ester, by providing a raw material selected from marigold flowers or marigold meal; subjecting the raw material to extraction using ethanol followed by acetone; and concentrating to obtain an extract which may then be crystallized to obtain lutein ester crystal of high purity. Further, the present disclosure provides a method for preparing lutein ester, by providing a raw material selected from marigold flowers or marigold meal; subjecting the raw material to extraction using isopropanol; and concentrating to obtain an extract which may then be crystallized to obtain lutein ester crystal of high purity.

The invention relates to a process for extracting alcohols from an initial mixture (1) comprising alcohols in aqueous phase, with:a distillative separation by an isopropanol-butanol distillation column (III) equipped at the top with a condenser (c3), intended for separating said mixture into a water-isopropanol azeotrope stream (6) at the top and into a water-butanol azeotrope stream (7) at the bottom,a distillative separation intended for separating the water-butanol azeotrope stream into water and butanol, by a hetero-azeotropic distillation system comprising at least one water-recovering water column (IV) and at least one butanol (9)-recovering butanol column (V) equipped with a reboiler (r5),such that a heat transfer is performed from the top water-isopropanol azeotrope stream (6) entering the condenser of the isopropanol-butanol distillation column (III), to the stream entering the reboiler of the butanol column (V).

The invention relates to the technical field of petrochemical engineering, in particular to a continuous production method of high-stability N-methyldiisopropanolamine. The method comprises the following steps: heating and reacting methylisopropanolamine and propylene oxide under the action of a specific catalyst to generate an N-methyldiisopropanolamine crude product; then adding the crude product into a rectifying tower, and extracting a high-purity N-methyldiisopropanolamine product from a side line at the middle upper part; the used catalyst is citric acid modified zeolite loaded copper-chromium bimetal. According to the production method disclosed by the invention, by optimizing an active site structure and a rectification separation path of the catalyst, efficient and stable operation of a reaction process is realized, and the thermal stability of a final product is remarkably improved.

The invention discloses low-carbon high-strength concrete and a preparation method thereof, the concrete comprises the following components in parts by weight: 0-150 parts of cement, 150-200 parts of fly ash, 150-200 parts of blast furnace slag, 70-100 parts of silica fume, 10-20 parts of nano MgO, 700-850 parts of sand, 900-100 parts of stone, 9-15 parts of a water reducing agent, 1-5 parts of diethanol isopropanolamine and 95-105 parts of water, the sand is composed of sand with the particle size of 1.25-5 mm and sand with the particle size of 0-1.25 mm, and the low-carbon high-strength concrete is obtained through CO2 curing. Through reuse of the machine-made sand and the natural sand and the synergistic effect of the nano MgO and the diethanolisopropanolamine, the hydration reaction and the pore structure are optimized, the strength and durability are improved, and the cement consumption is reduced; meanwhile, CO2 is converted into carbonate minerals by combining a carbon capture technology, so that the carbon emission is further reduced, and the performance is enhanced; the concrete quality is guaranteed, meanwhile, economic benefits and environmental value are achieved, and the method is suitable for green building engineering.