39results about How to "Does not involve high temperature and pressure" patented technology

The invention discloses an aerogel preparation method. The aerogel preparation method comprises the following steps of immersing gel into a solvent, putting the gel solution into a vacuum tank, and carrying out vacuum-pumping so that the solvent is evaporated in vacuum and after the solvent is completely evaporated, aerogel is obtained. The aerogel preparation method is a fast drying method. In vacuum-pumping, the solvent in the gel is fast volatilized so that a large amount of heat is taken away and a system temperature is reduced; reactivity of active groups in a gelskeleton is reduced; and irreversible collapse possibility is reduced. The gelskeleton has strong rigidity at a low temperature so that a gel structure is kept well. The aerogel obtained by the aerogel preparation method has low density, large porosity and a high specific surface area, and has standard features of aerogel prepared by a supercritical method.

The invention provides a synthesis process for industrially producing daidzein. The synthesis process of the invention has simple raw material and easy operation, can realize standard process flow. When the synthesis process is used in industrial production, the whole reaction condition is very moderate compared to other organic synthesis conditions, and the production process is finished only by using the conventional chemical equipment without requiring high temperature and high pressure, and the period is short. In the synthesis process, the yield of the daidzein is over 50%, the yield of the daidzein with purity of over 98% is over 60% and the purity is over 98%.

The invention discloses environment-friendly biology liquid fuel and a preparation method of the environment-friendly biology liquid fuel. The environment-friendly biology liquid fuel is composed of, by weight, 55% to 75% of animal and vegetable oil, 15% to 20% of carbon 5, 10% to 12% of methylal, 5% to 10% of fatty acid methyl ester, 0.5% to 3.0% of triethylamine, 0.1% to 2.0% of smell masking agents and 0.05% to 1.5% of hydrazine. The preparation method of the environment-friendly biology liquid fuel includes the steps of firstly, taking the animal and vegetable oil, the methylal and the fatty acid methyl ester according to the mass ratio and fully mixing the animal and vegetable oil, the methylal and the fatty acid methyl ester; secondly, weighing the carbon 5 and the hydrazine according to the mass ratio and fully mixing the carbon 5 with the hydrazine; thirdly, mixing the mixed liquor obtained in the first step with the mixed liquor obtained in the second step; fourthly, sequentially adding the triethylamine and the smell masking agents according to the mass ratio and completing the preparation after the mixture is fully stirred and mixed. The key indicators of the product are up to the national standard for light diesel oil, and therefore the environment-friendly biology liquid fuel can not only be used as boiler fuel, but also be used as power fuel.

The invention relates to a method for preparing an aromatic aldehyde/ketone compound based on photoelectrocatalysis. A reaction system is included and comprises an anode solution obtained by mixing a compound in formula I and an acid solution of metal ions, a cathode solution, namely, an acid solution, an anode, namely, a photocatalyst film electrode, a cathode Pt and a reference electrode, namely, mercury-mercurous sulfate; the reaction system carries out a reaction for 1-8 h at the bias voltage of -0.3 V-0.9 V and at the temperature of 10-70 DEG C, then the anode solution is extracted, an organic phase is purified to obtain the compound in formula II, an inorganic phase is utilized cyclically, and a cathode product is hydrogen. The formulas are shown in the specification. Alkylated aromatic is indirectly and selectively oxidized into corresponding aldehyde/ketone through the photoelectrocatalysis technology and meanwhile hydrogen is generated by the cathode. Photoproduction electrons are separated from a hole through an optical excitation semiconductor, and the hole has the strong oxidizing property. Ce3+ or Mn2+ is oxidized into Ce4+ or Mn3+ in an aqueous solution through the photoproduction hole, the alkylated aromatic is oxidized into corresponding aldehyde/ketone through high-valence Ce4+ or Mn3+, and Ce4+ or Mn3+ is reduced into Ce3+ or Mn2+ to form a cycle. Meanwhile, H+ of H2O can be reduced into H2 through the photoproduction electrons.

The invention relates to an industrial process control experimental device capable of acquiring a non-minimum phase characteristic and a method, and belongs to the experiment and teaching field of industrial automation and process control technologies. The industrial process control experimental device is composed of a controlled object unit and a computer control unit, and is characterized in that the controlled object unit is composed of a first motor speed regulation device, a first air blower, a second motor speed regulation device, a second air blower, a first electric actuating mechanism, a first regulating baffle, a second electric actuating mechanism, a second regulating baffle, an air heater, a tee joint, an air thermometer and an air flow meter; and the computer control unit is a PLC/DCS. The method comprises the steps of designing a single-circuit controller by taking the frequency of the second motor speed regulation device or the opening degree of the second regulating baffle as a controlling variable and taking the normal-temperature air flow as a controlled variable; constituting a non-minimum phase controlled object by taking the frequency of the first motor speed regulation device or the opening degree of the first regulating baffle as a controlling variable and taking a medium-temperature air flow temperature as a controlled variable, and designing a controller which is suitable for the non-minimum phase controlled object.

The invention belongs to the field of lignin recycling, and particularly relates to a method for degrading lignin in papermaking black liquor. The method includes steps of (1), extracting the lignin in the papermaking black liquor; (2), adding the lignin extracted at the step (1), a catalyst and aqueous solution into a reaction device according to appropriate proportions and carrying out degradation reaction. The catalyst is imidazole phosphotungstate. The method has the advantages that the imidazole phosphotungstate is used as the catalyst for carrying out the degradation reaction on the lignin extracted from the papermaking black liquor, high-temperature, high-pressure and strongly alkaline environments can be omitted in the integral degradation reaction, the high degradation rate stillcan be guaranteed under mild degradation reaction conditions, the method has low requirements on equipment and is favorable for industrially treating the papermaking black liquor on a large scale, andenergy consumption can be reduced to a great extent; the imidazole phosphotungstate which is the catalyst is non-volatile, has a low melting point, is provided with organic-inorganic hybrid structures and is soluble, and accordingly the catalyst is high in efficiency, easy to recycle and good in reusability.

The invention provides a silicon-based molecular sieve/carbon tube sulfur-loaded composite positive electrode material, a preparation method and an application thereof. The technical scheme is that the preparation method comprises the following steps: mixing and grinding a carbon tube and elemental sulfur, adding CS2 and fully stirring, after that, drying to obtain a carbon tube sulfur-loaded composite material; and mixing the carbon tube sulfur-loaded composite material with carbon black and polyvinylidene fluoride according to a certain mass ratio, then adding N-methylpyrrolidone and the silicon-based molecular sieve, stirring and performing ultrasonic dispersion to be uniform, controlling the viscosity to be 1,000 to 10,000cps to obtain slurry, uniformly coating the obtained slurry on acurrent collector aluminum foil with a thickness of 150 to 400mm, then transferring the aluminum foil to a drying oven at 40 to 60 DEG C to obtain the silicon-based molecular sieve/carbon tube sulfur-loaded composite positive electrode material. The preparation method disclosed by the invention is simple to operate and easy for large-scale production; the prepared silicon-based molecular sieve/carbon tube sulfur-loaded composite positive electrode material is used for a lithium-sulfur battery, so that the dissolution of polysulfide ions in liquid electrolyte in the charging and discharging process of the lithium-sulfur battery can be solved, a shuttle effect is effectively inhibited, and the coulombic efficiency and the cycling stability of the lithium-sulfur battery are improved.

The invention discloses a composite conductive monofilament and a preparation method and application thereof. The composite conductive monofilament comprises a matrix, graphene, a carbon nano tube andcarbon black. The composite conductive monofilament has a point-line-plane three-dimensional conductive network and has a permanent antistatic property, the surface resistance is 10-1000 omega, the strength is greater than or equal to 40 Mpa, the elongation is greater than or equal to 115%, the ultraviolet protection performance T(UVA)AV(%) is less than or equal to 5%, T(UVB)AV(%) is less than orequal to 5%, UPF Rating is greater than or equal to 50, the far-infrared emissivity is greater than or equal to 0.88, the half-life period is less than or equal to 2.0 seconds, and the bacteriostasisrate is greater than or equal to 97%.

The invention provides a preparation method of a metal phthalocyanine/carbon tube composite material and application thereof in a lithium-sulfur battery cathode. The preparation method comprises the steps of: mixing and grinding a carbon tube and a sulfur element, and adding CS2 for full stirring and then drying to prepare a carbon tube sulfur-carrier composite material; and mixing the carbon tubesulfur-carrier composite material with the carbon nanotube, polyvinylidene fluoride and metal phthalocyanine in a certain mass ratio, then adding N-methylpyrrolidone for stirring and uniform ultrasonic dispersion, controlling the viscosity in a range of 1000-10000 cps to obtain slurry, coating the slurry on a current collector aluminum foil with a thickness of 150-400 mm, and performing drying toobtain a metal phthalocyanine/carbon tube composite material. The preparation method of the metal phthalocyanine/carbon tube composite material is simple to operate and easy for large-scale production. The prepared composite material is used in lithium-sulfur batteries to solve the dissolution of polysulfide ions in liquid electrolyte during charging and discharging of lithium-sulfur batteries, effectively suppress the shuttle effect and improve the coulombic efficiency and the cycle stability of the lithium-sulfur batteries.

The invention relates to gadolinium-doped zinc oxide nanoparticles and a preparation method thereof. The preparation method comprises the following steps: dissolving zinc methacrylate and a gadolinium compound in a solvent, heating to obtain a colorless transparent solution, adding 0.3g of azodiisobutyronitrile and 15ml of methacrylic acid-monomethyl polyethylene glycol ester, heating, stirring for 5 minutes, and adding 0.3g of azodiisobutyronitrile and 100ml of a 0.15mol/L alkali solution; performing reflux on a mixture under the conditions of heating and stirring for 1 hour, and dialyzing and purifying in de-ionized water to finally obtain a water solution product. The method has the advantages that cheap zinc materials with good biocompatibility are adopted, a gadolinium-doped zinc oxide nanoparticle product is directly synthesized by adopting a sol-gel method, the biological toxicity of the final product is reduced, the product cost is lowered, and the product has application prospect of magnetic resonance and fluorescent bifunctional imaging.

The invention discloses a synthetic method of novel liquid crystal material 3-butoxy-N,N-dimethylpropanamide. The synthetic method comprises following steps at least: step 1, condensation reaction, wherein n-butyl alcohol is mixed with an alkali, N,N-dimethylpropanamide is added dropwise at heating conditions for reaction, and a crude product (1) is obtained after a certain time of reaction; and step 2, refining, wherein the crude product (1) is subjected to heating and vacuum rectifying column separation so as to obtain qualified product 3-butoxy-N,N-dimethylpropanamide. Raw material source of the synthetic method is simple; high temperature and high pressure are not needed; the synthetic method is safe and reliable; operationality is high; and influence on the environment is less.

The invention discloses a process method for preparing ammonia borane from boroxol acid ammonium through electrochemical reduction in a recycling manner. According to the process method, electrochemical reduction is carried out by virtue of a three-dimensional negative electrode with relatively high hydrogen overpotential under an electrochemical reduction principle based on ammonia borane hydrolysate ammonia metaborate as a raw material, so that conversion of boroxol acid radical ions into borone hydrogen acid radical ions is promoted. White floppy ammonia borane solid can be prepared through operation steps such as boroxol acid ammonium electroreduction, freeze-drying dehydration, dissolution backflowing, centrifugal treatment, rotation evaporation, crystallization and the like. The process method is gentle in preparation condition, short in process, low in energy consumption, simple and convenient to operate, free of waste discharge and free of environment pollution, and the raw materials which are byproducts generated from hydrolysis hydrogen release of ammonia borane are low in price and easily available. In addition, due to adoption of an appropriate electrode material, the current efficiency of electroreduction of a negative electrode chamber to generate hydroboron can be improved.

The invention relates to an industrial waste liquid regenerant and a preparation method thereof. The regenerant is prepared by adjusting copolymerization of the following raw materials through an aqueous solution, and the regenerant is prepared from, by weight, 10-20 parts of unsaturated acid, 10-20 parts of unsaturated amide, 0.5-5 parts of a molecular weight regulator, 0.1-2.0 parts of an initiator, and 100 parts of water. A dust suppressant is prepared by adopting unsaturated acid and unsaturated amide through an aqueous solution regulation copolymerization technology, various metal ions are promoted to flocculate and settle through coordination and crosslinking of the metal ions, separated floccules can be used as an industrial raw material, and recycled acid liquor is locally returnedand reused. The preparation method is simple in preparation process, good in comprehensive performance, safe and environment-friendly.