201results about How to "Rich sources" patented technology

The invention discloses a preparation method and application for preparing a cobalt-doped manganese dioxide material by taking Co3 [Co (CN) 6] 2 as a hard template, and belongs to the technical field of electrode material preparation. The preparation method comprises the following steps: firstly, preparing a Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material through a liquid phase coprecipitation reaction method; and then preparing the cobalt-doped manganese dioxide material with a loose porous structure by taking the Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material as a hard template and potassium permanganate as a reaction raw material and adopting a hydrothermal synthesis method, specifically, forming a submicron cube with the size of 200-700nm by combining nanosheets with the thickness of about 10-20nm, and preparing the cobalt-doped manganese dioxide material with the loose porous structure by adopting a hydrothermal synthesis method. And an optimization strategy of Co atom doping of manganese dioxide and nanosheet morphology control is synchronously completed. When the material is used as an electrode material, the conductivity of the manganese dioxide electrode material is greatly improved, the capacity of an aqueous zinc ion battery is improved, and the material has excellent charge-discharge cycle stability.

The invention discloses a mine filling cementing material and a preparation method thereof. The mine filling cementing material comprises the following components in percentage by mass: 3-8 wt% of high belite sulphoaluminate cement clinker; 1-3 wt% of high free calcium silicate cement clinker; 74 to 85 wt% of granulated blast furnace slag powder or granulated blast furnace slag; and 10 to 18 wt% of gypsum. Compared with other paste filling materials with the same strength, the cementing material solves the problems that in the prior art, a mine filling cementing material is poor in excitation effect and poor in mechanical property, so that the mine filling effect is affected, and the cost is high due to the fact that the using amount of the cementing material is large, and meanwhile the using proportion is reduced; and the use of mine backfill engineering is fully met.

The invention relates to the technical field of photovoltaic crystalline silicon waste treatment, and discloses a method for preparing a lithium-rich silicon monoxide negative electrode material from photovoltaic crystalline silicon waste, and the method comprises the following steps: step 1, crushing and granulating the photovoltaic crystalline silicon waste; 2, preparing silicon monoxide particles; step 3, preparing lithium-rich silicon monoxide particles; step 4, preparing carbon-coated lithium-rich silicon monoxide particles; and 5, constructing a conductive network of the carbon-coated lithium-rich silicon monoxide particles to obtain the carbon-coated lithium-rich silicon monoxide negative electrode material with the three-dimensional conductive network. According to the scheme, high-value utilization is carried out on the photovoltaic silicon crystal waste, and the problem of subsequent treatment of solid waste is solved; the source pressure of the silicon-based negative electrode material is effectively relieved, and the preparation cost pressure of the silicon-based negative electrode material is reduced; the problems of low initial coulombic efficiency, obvious volume expansion, poor conductivity and the like of the silicon-based negative electrode material are solved by carrying out pre-lithiation, carbon coating, net coating, doping and the like on the material.

The invention relates to the field of paint and ink additives, and particularly discloses a water-based bio-based anti-wear agent for water-based paint and ink and a preparation method of the water-based bio-based anti-wear agent. The invention discloses a water-based bio-based anti-wear agent for water-based paint ink and a preparation method thereof. The water-based bio-based anti-wear agent comprises the following raw materials in parts by weight: 30-50 parts of palm wax, 16-24 parts of rice bran wax, 2-8 parts of oleamide and 0.2-0.6 part of a reinforcing agent. In addition, the invention has the advantage of improving the environmental friendliness of the anti-wear agent.

The invention discloses micro-chemical continuous synthesis equipment and preparation method of nano barium sulfate / barium carbonate, and the micro-chemical continuous synthesis equipment comprises a support frame for bearing the whole equipment; the outer shell is fixed on the support frame, and a plurality of annularly distributed arc-shaped openings are formed in the lower part of the outer shell; the top of the inner shell is fixedly connected with the top of the outer shell, and the lower portion of the inner shell is provided with an adjusting arc opening corresponding to the arc opening. The rotary adjusting assembly is rotationally arranged between the outer shell and the inner shell; the continuous phase conveying device is fixedly arranged in the center of the upper part of the inner shell; the dispersed phase conveying device is fixed in the center of the lower part of the inner shell; the adjusting conveying device corresponds to the arc-shaped opening in the outer shell and is fixed on the outer side of the dispersed phase conveying device; and the collecting assembly is fixed at the bottom of the dispersed phase conveying device and corresponds to the inner shell and the outer shell. According to the invention, controllable growth of crystal grains can be realized, the product size is uniform, the nanocrystallization degree is high, and supporting facilities such as front-end pretreatment and rear-end filtering and drying of a traditional process can be coupled.

The invention provides ultralow-viscosity brominated cardanol as well as a preparation method and application thereof, and belongs to the technical field of macromolecular flame-retardant materials. The technical problem that most existing brominated flame retardants are powder or high-viscosity liquid and cannot meet the requirement of spraying construction for low viscosity is solved. The ultralow-viscosity brominated cardanol has a structure as shown in the following formula (1): # imgabs0 #, wherein R is alkyl or halogenated alkyl; r1 is a bromine-containing cardanol carbon pentadecyl side chain; x is any real number from 1 to 3; the preparation method comprises the following steps: S1, dissolving cardanol in an organic solvent I, adding a bromine-containing solution, after complete reaction, washing an organic phase with water, separating liquid to remove water, and distilling out the organic solvent I under reduced pressure to obtain a brominated intermediate; and S2, dissolving the brominated intermediate in an organic solvent II, adding an anhydride substance, completely reacting in the presence of a catalyst, washing an organic phase with water, separating liquid to remove water, and distilling out the organic solvent II under reduced pressure to obtain the ultralow-viscosity brominated cardanol.

The invention belongs to the technical field of MOFs-biomass composite carbon matrix preparation, and particularly relates to a preparation method and application of a high-performance solid hydrogen storage material, and the high-performance solid hydrogen storage material is a ZIF-8-pine sawdust composite carbon matrix; the preparation method of the high-performance solid hydrogen storage material comprises the following steps: S1, carrying out acid pickling treatment on biomass, washing the biomass with deionized water until the biomass is neutral, and drying the biomass for later use; s2, performing carbonization treatment on the biomass obtained in the step S1 in an inert protective atmosphere to obtain a carbon precursor; and S3, grinding and mixing the carbon precursor obtained in the step S2 and a chemical activator, putting the mixture into a self-made reactor, sealing after all air in the reactor is exhausted, and carrying out an activation reaction. The MOFs and pine sawdust composite carbon substrate with a high specific surface area is prepared by adopting a method which is simple in process, green, environment-friendly, economical and efficient, and the MOFs and pine sawdust composite carbon substrate has a three-dimensional interconnected pore structure, is adjustable in specific surface area and has relatively high hydrogen storage capacity.

The invention discloses a method for degrading micro-plastics by using a composite semiconductor photocatalyst, and relates to the field of environmental protection, in the preparation process, transition metal copper powder and semiconductor material titanium dioxide are firstly mixed and dispersed in absolute ethyl alcohol, so that the copper powder and the titanium dioxide can be ensured to be fully and uniformly mixed together; and filtering, drying and calcining together to obtain the copper oxide and titanium dioxide composite semiconductor material. The defect that titanium dioxide is low in response to visible light is effectively overcome, electron-hole separation is promoted, the electron-hole mobility is improved, the catalyst convenient to prepare is provided for photocatalytic degradation of micro-plastics at normal temperature and normal pressure, and the method has the advantages of being simple in process, low in price, mild in reaction condition and the like.

The invention belongs to the technical field of indoor air pollution treatment, and particularly discloses an aluminum hydroxide loaded carbon quantum dot material for removing formaldehyde, gel and a preparation method of the aluminum hydroxide loaded carbon quantum dot material for removing formaldehyde, and the preparation method of the aluminum hydroxide loaded carbon quantum dot material comprises the following steps: uniformly mixing, grinding and dispersing amorphous aluminum hydroxide powder and basic amino acid; transferring into a microwave oven for microwave radiation reaction, filtering, washing and drying after the reaction is finished, and then crushing to obtain the aluminum hydroxide loaded carbon quantum dot material. The preparation method is simple in preparation process, short in reaction time and suitable for industrial production, and the prepared aluminum hydroxide loaded carbon quantum dot material and gel are high in formaldehyde removal rate and have long-term effectiveness.

The invention provides antibacterial carboxymethyl cellulose hemostatic gauze and a preparation method thereof.The preparation method comprises the steps that carboxymethyl cellulose gauze is soaked in a PBS buffer solution, N-hydroxysuccinimide and 1-ethyl-(3-dimethylaminopropyl) carbodiimide are added into the PBS buffer solution, and a soaking solution is obtained after uniform mixing; adding the graft modified alginate oligosaccharide into the soaking solution, mixing and stirring to generate grafting reaction, taking out the carboxymethyl cellulose gauze after the reaction is finished, washing and drying to obtain the antibacterial carboxymethyl cellulose hemostatic gauze. According to the preparation method disclosed by the invention, the catechol-grafted modified alginate oligosaccharide and partially carboxymethylated carboxymethyl cellulose gauze are subjected to amidation grafting compounding, so that the hemostatic gauze with excellent antibacterial and hemostatic properties is prepared.

The invention discloses a preparation method and application of a boron and fluorine co-doped potassium ion battery positive electrode material, the chemical formula of the boron and fluorine co-doped potassium ion battery positive electrode material is K < 0.5 > Mn < 0.73 > Ni < 0.22 > B < 0.05 > F < 0.05 > O < 1.95 >, bond energy of O-O and TM-O is changed through introduction of boron and fluorine, TM atom spacing is reduced, and interlayer spacing is increased, so that a wider ion transmission channel can be provided, and the service life of the battery is prolonged. And structural deformation is inhibited. In addition, introduction of boron and fluorine inhibits irreversible release of oxygen anions, and side reactions are reduced. The crystal structure of the manganese-based layered metal oxide positive electrode material is synergistically regulated by anions and cations, so that the prepared boron and fluorine co-doped potassium ion battery positive electrode material has good cycling stability and excellent rate capability.

The invention discloses a high-entropy positive electrode material of a potassium ion battery and a preparation method and application of the high-entropy positive electrode material, the high-entropy positive electrode material is a layered oxide with a P2 / rock salt biphase symbiotic structure, the chemical general formula of the high-entropy positive electrode material is K < 0.6 > Mn < 0.75-x > Ni < 0.1 > Ti < 0.1 > Mg < x > Cu < 0.05 > O2, and x is more than 0 and less than or equal to 0.1. A high-temperature solid-phase method is adopted in the preparation process, the high-entropy layered oxide positive electrode material with symbiotic two phase structures of P2 and rock salt is finally formed by regulating and controlling the types and the content of doped elements, sliding of a TM layer in the charging process and large structural stress generated in the circulating process are relieved through introduction of a small amount of rock salt phase, and the performance of the positive electrode material is improved. And lattice distortion and cracks in particles in the long circulation process are improved, so that the electrochemical circulation stability and rate capability of the potassium ion battery are remarkably improved.

The invention relates to a preparation method of propargyl alcohol, and belongs to the technical field of organic chemistry. The reaction formula is as follows: # imgabs0 #; comprising the following steps: (1) taking Z-1, 3-dichloropropene as a raw material, adding dimethyl sulfoxide and solid alkali into an organic solvent, heating, carrying out heat preservation reaction until the content of the Z-1, 3-dichloropropene is less than or equal to 1%, and cooling to room temperature; (2) adding a phase transfer catalyst and water into the reaction liquid obtained in the step (1), heating, and carrying out a heat preservation reaction until an intermediate 3-chloropropyl-2-ene-1-ol is less than or equal to 0.5%; cooling to room temperature; (3) filtering, separating liquid, and adding an extracting agent into a water phase for extraction; and rectifying the extracted organic phase to obtain propargyl alcohol. By controlling the alkaline strength and reaction parameters in the reaction, the production of organic impurity ether compounds can be effectively controlled, the purity and yield of the product are improved, and meanwhile, the reaction time is shortened.

The invention belongs to the technical field of photo-thermal catalysis and biomass resource utilization, and particularly relates to a sulfonated biochar PC-SO3H-1 catalytic material as well as a preparation method and application thereof. The preparation method comprises the following steps: performing NaOH aqueous solution ultrasonic pretreatment, washing, drying and grinding on cellulose to obtain pretreated cellulose powder, uniformly dispersing the pretreated cellulose powder, p-toluenesulfonic acid and citric acid in deionized water, fully stirring at room temperature, then transferring the solution into a high-pressure reaction kettle, reacting, cooling, washing and drying to obtain the cellulose-p-toluenesulfonic acid / citric acid composite material. And grinding to obtain the PC-SO3H-1 photo-thermal catalytic material. The catalyst disclosed by the invention can be used for performing efficient photothermal conversion, so that the generation of biodiesel can be quickly catalyzed under the condition of room temperature.

The invention belongs to the field of preparation of oxidized starch, and relates to a method for preparing oxidized starch by a mechanochemical method. Hydroxyl of corn starch is oxidized by hydrogen peroxide to generate modified starch with high carboxyl content, so that the modified starch has wider application. The preparation thought of a full bio-based mechanical method is adopted, the obtained modified starch has good economical efficiency, environmental safety and natural degradability, and the problems that an oxidized starch preparation process in the current market is large in environmental pollution, wastes resources, is tedious in process and the like are solved. According to the invention, biomass is used as a reaction raw material, is renewable and degradable, and accords with the green chemistry concept.

The invention relates to a preparation method of a pure-phase sodium ion battery positive electrode material, the positive electrode material is a carbon-coated ferric sodium phosphate pyrophosphate material, the chemical formula of the ferric sodium phosphate pyrophosphate is NaaFeb (PO4) cP2O7, 3 < = a < = 4, 2 < = b < = 4, and 1 < = c < = 3; the preparation method comprises the following steps: weighing the sodium carbonate, the iron phosphate, the sodium dihydrogen phosphate, the citric acid and the dispersing agent according to a stoichiometric ratio; the preparation method comprises the following steps: dissolving sodium carbonate and citric acid in a solvent for reaction to obtain first slurry; mixing the first slurry, iron phosphate, sodium dihydrogen phosphate and a dispersing agent to obtain second slurry; drying the second slurry to obtain a precursor; and pre-sintering the precursor in a protective gas atmosphere, and then continuously heating for sintering to obtain the positive electrode material, according to the method, the pure-phase ferric pyrophosphate sodium positive electrode material can be obtained, and the electrochemical performance of the positive electrode material is effectively improved.

The invention provides a preparation method and application of a MoS2 / Fe2O3 (at) Fe-MOF modified carbon electrode, and the preparation method of the MoS2 / Fe2O3 (at) Fe-MOF modified carbon electrode comprises the following steps: preparation of Fe2O3 (at) Fe-MOF powder, preparation of isopropanol IPA-MoS2 nanosheet dispersion liquid, preparation of MoS2 / Fe2O3 (at) Fe-MOF composite material dispersion liquid, and preparation of the MoS2 / Fe2O3 (at) Fe-MOF modified carbon electrode. The problems that an existing cathode is low in HO generation and activation catalysis performance, the pollutant degradation performance is not ideal, electrode materials are complex to prepare, cost is high and the like are solved. The prepared composite electrode is applied to a BEF system, has high power density, good electron transport performance and excellent degradation performance on antibiotics, can be recycled for multiple times, and has a very wide application prospect in the field of electro-Fenton.

The invention discloses a method for biologically converting isorhamnetin, which comprises the following steps: adding a microorganism for producing glucosidase, glycosyl transferase and / or succinyl transferase, or producing glucosidase, glycosyl transferase and / or succinyl transferase into an isorhamnetin substrate, adding a glycosyl donor for synchronous conversion, and separating and purifying, thereby obtaining the isorhamnetin. And the isorhamnetin-3-O-glucoside, the isorhamnetin-3-O-beta-(6 ''-O-succinyl)-D-glucoside and / or the isorhamnetin-3, 7-O-diglucoside are obtained after the reaction is finished. The method is green, safe and high in conversion efficiency, the product has higher water solubility, the bioavailability and additional value of the flavone compound can be improved, and high-valued utilization of natural plant product raw materials is achieved.

The invention discloses a cadmium-containing wastewater treatment method and system, and the treatment method comprises the following steps: S1, culturing selenastrum capricornutum and microcystis aeruginosa, carrying out cell digestion, centrifuging, and dispersing to obtain mixed algae cells; s2, co-incubating the mixed algae cells and a sodium selenite solution to obtain incubated mixed algae cells; and S3, adding the incubated mixed algae cells into the cadmium-containing wastewater for treatment. Through the combined action of the selenastrum capricornutum and the microcystis aeruginosa, a large amount of cadmium ions in the cadmium-containing wastewater can be absorbed, the purpose of wastewater purification is achieved, and the method has the advantages of being low in energy consumption, high in efficiency, free of secondary pollution, low in treatment cost, green, clean, sustainable in development and the like.

The invention provides porous fiber aerogel as well as a preparation method and application thereof in protein adsorption separation. The porous fiber aerogel comprises alginic acid fibers and sodium alginate, the alginic acid fibers and the sodium alginate are mixed and then subjected to directional freezing forming through liquid nitrogen, and a regular vertical hole structure is formed through calcium ion crosslinking. The provided porous fiber aerogel has a high specific surface area, the surface of the porous fiber aerogel is provided with a large number of carboxyl functional groups, the porous fiber aerogel can be combined with a large number of positively charged proteins through electrostatic interaction and functional group effects to adsorb and separate the proteins, and the porous fiber aerogel has a good adsorption effect.

The invention provides a shaped phase change material and a preparation method thereof. The phase change material is prepared from the following raw materials in percentage by mass: 45.8 to 56.7 percent of sodium phosphate dibasic dodecahydrate, 7.9 to 22.9 percent of sodium carbonate decahydrate, 7.6 to 15.9 percent of sodium sulfate decahydrate, 2.46 to 4.05 percent of a reinforcing material and 15 to 20 percent of an adsorbing material. The preparation method of the phase change material comprises the following steps: 1, preparing materials; 2, preparing an inorganic salt mixture; 3, preparing a molten inorganic salt mixture; 4, preparing a mixed material and sealing; and 5, preparing the shaped phase change material. The shaped phase-change material prepared by the invention has the advantages of proper phase-change temperature, higher phase-change latent heat, no liquid leakage, no toxicity, no inflammability, small supercooling degree and no phase separation; meanwhile, for application occasions where transportation and storage need to be carried out at the temperature of 20-30 DEG C, the shaped phase change material can serve as an effective normal-temperature cold storage agent and is used for resisting a low-temperature environment so as to protect specific chemicals and pharmaceuticals from being influenced by temperature fluctuation.

The invention discloses a preparation method of a hard carbon sodium battery negative electrode material, and relates to a preparation method of a negative electrode material. The method comprises the following steps: 1, pre-oxidation treatment; 2, preparing an asphalt / binder mixture; 3, heat treatment; 4, rough grinding; 5, carbonizing; and 6, crushing. Asphalt which is low in cost and stable in supply is used as a raw material, surface oxygen-containing functional groups are enhanced through surface oxidation, then resin is added to serve as a binder to enable the asphalt to form a cross-linked structure, a large number of irregular closed-pore structures exist in a generated hard carbon structure through high-temperature carbonization, the sodium storage performance of the material is improved, meanwhile, the specific surface area is reduced, and the specific surface area is increased. Therefore, side reactions are reduced, the first efficiency is improved, and the high-performance sodium battery negative electrode material with the reversible capacity higher than 300mAh / g and the first efficiency higher than 90% is obtained. The hard carbon sodium battery negative electrode material can be obtained.

The invention relates to the field of preparation of guanidine or derivatives thereof, and particularly discloses high-purity creatine monohydrate and a preparation method thereof. The preparation method comprises the following steps: sequentially carrying out condensation reaction, acidolysis reaction and hydrolysis reaction on dimethyl sulfate and urea, cooling, crystallizing and filtering to obtain O-methylisourea hydrogen sulfate, and then reacting a sarcosine salt aqueous solution with the O-methylisourea hydrogen sulfate under the conditions that the temperature is 45-65 DEG C and the pH value is 10-12 to obtain the sarcosine salt. And performing post-treatment to obtain the high-purity creatine monohydrate. The preparation method has the advantages of being low in raw material cost, easy to transport and store and rich in source, byproducts in the reaction process are few, danger is low, the yield and purity are high, the industrial requirement is met, and the preparation method is suitable for large-scale industrial production.

The method comprises the following steps: mixing a zero-valent iron source, a + 2-valent iron source, a carbon source and a solvent, and carrying out a reaction so as to obtain a solution A; adding a sodium source and a phosphorus source into the solution A, and reacting to obtain a solution B; adding a dispersing agent into the solution B, and reacting to obtain a solution C; stirring the solution C to a gel state, and drying to obtain a precursor; and carrying out ball milling treatment on the precursor, pre-sintering at a low temperature under a protective atmosphere, and sintering at a high temperature to obtain the sodium ferric pyrophosphate material. According to the invention, a 0-valent iron source and a + 2-valent iron source are adopted, the valence state of the precursor iron source is regulated and controlled, and the high-purity ferric sodium pyrophosphate positive electrode material is synthesized under a standard stoichiometric ratio, and has a good crystallographic structure and excellent electrochemical performance; meanwhile, the material has the characteristics of low cost, simple preparation and easy large-scale production, and has a relatively good application prospect in the field of electrochemical energy storage.

The invention relates to the technical field of tobacco leaf raw material quality characteristic analysis, in particular to a tobacco leaf raw material quality characteristic analysis method based on data fusion, which comprises the following steps: obtaining related indication data of tobacco leaves from different types of tobacco leaf samples, and converting the related indication data of the tobacco leaves into a related indication data matrix of the tobacco leaves; measuring infrared spectrum data of different types of tobacco leaf samples, preprocessing the measured infrared spectrum data of the tobacco leaf samples, performing principal component analysis on the preprocessed infrared spectrum data of the tobacco leaf samples, determining a principal component number k, and obtaining score P data and load V data; combining the score P data matrix with each related indication data matrix of the tobacco leaves to obtain a combined tobacco leaf quality data matrix D, and normalizing the tobacco leaf quality data matrix D to obtain a combined tobacco leaf quality data matrix X; and carrying out clustering analysis processing on the fused tobacco leaf quality data matrix X, and analyzing quality characteristics of different types of samples.

The invention relates to a method for co-producing mesophase pitch and isotropic pitch, which comprises the following steps: S1, carrying out pressurized copolymerization and fraction cutting on a raw material A, and fractionating gt; fractions B and lt at 400 DEG C; fraction C at 400 DEG C; s2, carrying out thermal polymerization on the fraction B to prepare mesophase pitch D and byproduct light oil E; s3, recycling the E, mixing the E with the C according to a specific proportion to serve as an isotropic asphalt modulation raw material, preparing isotropic asphalt F of different brands and byproduct light oil G through an air oxidation / negative pressure gas stripping process, and recycling G in the raw material A according to a specific proportion. According to the method, efficient utilization of the byproduct light oil in the asphalt preparation process is achieved, the asphalt yield is increased, and high-quality mesophase asphalt and isotropic asphalt of different brands can be prepared according to requirements.

The invention discloses a biomass-based water-based binder for a silicon negative electrode of a lithium ion battery as well as a preparation method and application of the biomass-based water-based binder. The preparation method of the binder comprises the following steps: adding carboxymethyl cellulose into water, uniformly stirring and mixing, then adding a caffeic acid monomer, then adding initiators hydrogen peroxide and ferrous sulfate, heating and stirring to react, after the reaction is finished, adding a LiOH solution to adjust the pH value to 6-8, and carrying out vacuum drying to obtain the binder. The biomass-based aqueous binder for the silicon negative electrode of the lithium ion battery is obtained. When the prepared binder is applied to the silicon negative electrode of the lithium ion battery, the mechanical performance, the cycle performance and the capacity retention rate of the lithium ion battery can be effectively enhanced.

The invention discloses an environment-friendly cold chain circulation heat preservation carton, and relates to the technical field of heat preservation cartons, the environment-friendly cold chain circulation heat preservation carton comprises a cold chain box, a heat insulation and preservation layer and a phase change layer are arranged in the cold chain box, the heat insulation and preservation layer is located on the outer side of the phase change layer, the heat insulation and preservation layer is aerogel heat insulation felt, and the phase change layer is filled with fatty acid; according to the invention, the fatty acid phase-change material filled in the phase-change layer can sensitively sense the temperature change in the box and generate phase change in time, when the temperature rises, solid fatty acid is converted into liquid fatty acid, and a large amount of heat is absorbed to prevent the temperature from rising rapidly; and when the temperature drops, the liquid fatty acid turns back to the solid state to release heat, so that the temperature drop speed is slowed down, the temperature in the box is always maintained in an appropriate stable interval, the fresh-keeping time of the cold-chain transportation articles is greatly prolonged, and the quality and safety of the articles are not influenced by temperature fluctuation.

The invention relates to a method for using a choline eutectic solvent as a carbon dioxide absorbent. A choline eutectic solvent is used in the method. Wherein the choline eutectic solvent is prepared by mixing choline chloride (ChCl) and ethanolamine (MEA) according to a molar ratio of 1: 5. Placing the round-bottom flask filled with ChCl and MEA in a constant-temperature magnetic stirring oil bath pan, and heating and stirring for more than 3 hours at the temperature of 100 DEG C; and after a uniform and transparent solution is formed in the flask, taking out the solution from the oil bath pan, and standing to room temperature. Transferring into a reagent bottle, and pasting a label for later use. The choline deep-eutectic solvent is simple in preparation method and low in toxicity, and is an efficient carbon dioxide absorbent.

The invention discloses a method for preparing high-purity mannan oligosaccharide from konjac fine powder, which comprises the following steps: washing the konjac fine powder with alcohol, treating with alpha-amylase and glucoamylase, degrading konjac glucomannan by using a compound enzyme consisting of beta-glucanase and beta-mannase, and finally adjusting the pH value to an isoelectric point to prepare the high-purity konjac mannan oligosaccharide. According to the method, high-content impurities such as starch, protein and alkaloid in the konjak fine powder are removed, the problem of accumulation control of konjak processing byproducts is solved, the utilization rate and the economic value of konjak resources are improved, and the source of mannan oligosaccharide is enriched. The method realizes recycling of the konjac fine powder, has the advantages of being simple in process, low in equipment requirement and suitable for industrial production, and can be popularized and applied on a large scale.