48results about How to "The process route is green and environmentally friendly" patented technology

The invention relates to a lithium ion battery silicon-based negative material and a preparation method thereof, which belong to the technical field of lithium ion battery negative materials. The lithium ion battery silicon-based negative material is prepared from silicon monoxide; the macroscopic particle diameter of the negative material is 10-25 micrometers; according to a microstructure, the negative material is composed of nanometer silicon particles covered with silica; the internal silicon particle diameter of the negative material is 20-30 nanometers; and at 0.1C discharge rate, the first discharge capacity of the negative material reaches 2010-2640 mAh / g, and is 420-790 mAh / g after 50 cycles. The negative materials with the structure characteristic combines the dispersion and the reduction of silicon particles; and on one hand, the silicon particles can be dispersed by a pore channel structure of silica so as to provide a space for the expansion of silicon in charge and discharge processes, on the other hand, the particle diameter of silicon can be reduced, and therefore, a volume effect of silicon in the charge and discharge processes can be weakened.

The present invention discloses a redox asymmetrical method for preparing L-phosphinothricin by biological multi-enzyme coupling. D, L-phosphinothricin is used as a raw material, the L-phosphinothricin is obtained through catalysis of an enzyme catalysis system, the enzyme catalysis system comprises a D-amino acid oxidase mutant for catalyzing D-phosphinothricin in the D, L-phosphinothricin into 2-carbonyl-4-[hydroxy (methyl) phosphonyl] butyric acid and a transaminase for catalyzing and reducing the 2-carbonyl-4-[hydroxy (methyl) phosphonyl ] butyric acid into the L-phosphinothricin, the D-amino acid oxidase mutant is obtained by mutation of D-amino acid oxidase in wild rhodotorula taiwanensis, and mutation sites are selected from one of the following four types: (1) M213S; (2) M213S-N54V-F58E; (3) M213S-N54V-F58E-D207A; and (4) M213S-N54V-F58E-D207A-S60T. The D-amino acid oxidase mutant has better catalytic efficiency, a conversion rate is far higher than that of wild enzyme when theracemic D, L-phosphinothricin is used as a substrate, and yield of PPO is also greatly improved.

The invention relates to a method for separating and extracting cepharanthine, which comprises the following steps of: taking a dry stephania tuberous root, crushing, adding 2 to 3L of water and 0.5 to 5ml of mixed bio-enzyme liquid into each kilogram of crushed material, soaking for 1 hour, adding 9 to 11L of 1 to 2 mass percent aqueous solution of HCL, heating to 90DEG C, and soaking for 3 hours; and separating out a liquid medicine, adding 9 to 11L of 1 to 2 percent aqueous solution of HCL into dregs, decocting for 3 hours, filtering, mixing filtrate, adsorbing by adopting a cation exchange column or cation cellulose column, enriching the cepharanthine, eluting by using solution that sodium hydroxide is added into 60 to 90 percent aqueous solution of ethanol until the saturation state as eluent, collecting eluent of a cepharanthine section, regulating the pH value to be 7, concentrating for recovering ethanol, filtering, dissolving a precipitate by using absolute ethanol, eluting and purifying by using an anion column, collecting eluent of a cepharanthine section, concentrating, crystallizing, and drying to obtain the cepharanthine. The method has the advantages of simple operation, light pollution, low cost, high yield, high purity of cepharanthine, and suitability for industrial production.

The invention provides a preparation method for 4-methyl-5-(2-ethoxyl)-thiazole. The 4-methyl-5-(2-ethoxyl)-thiazole is synthesized from 2-acetylbutyrolactone serving as a raw material through amination, chloration, condensation and oxidative reaction. The preparation method comprises the following steps of: introducing chlorine into 2-acetylbutyrolactone and hydrolyzing to obtain 3-acetyl chloride propyl alcohol; introducing ammonia gas into carbon bisulfide to obtain ammonium salt; oxidizing a condensation product of 3-acetyl chloride propyl alcohol and the ammonium salt with hydrogen peroxide or oxygen to obtain a product; extracting with dichloromethane; removing the dichloromethane; then performing reduced pressure distillation; and collecting fraction at 120-127 DEG C under the pressure of 395-400 Pa. The synthesis method has the advantages of readily available raw material, low production cost, simple process, mild reaction conditions and yield of reaching up to 82 percent.

The invention discloses a high-efficiency low-resistance air filter material prepared form special-shaped melt-blown fiber and a preparation method of the high-efficiency low-resistance air filter material. The high-efficiency low-resistance air filter material is characterized in that a coarse filtration part, a supporting part and a fine filtration part are sequentially arranged from top to bottom to form a filter material adopting a sandwich structure; needling is performed under the conditions that the needling depth ranges from 5 mm to 7 mm and the needling density ranges from 390 needles per cm<2> to 480 needles per cm<2>, and all parts of the filter material are connected to form the high-efficiency low-resistance air filter material; the coarse filtration part and the fine filtration part are made from chemical fiber and combed into net-shaped structure, and the supporting part is made from the special-shaped melt-blown fiber. The high-efficiency low-resistance air filter material has high filter efficiency, the filter resistance is lower, the manufacturing cost is low, and the process is simple and environment-friendly; the special-shaped melt-blown fiber is used for preparing the filter material for the first time, and a great breakthrough is made in the field of filter materials.

The invention discloses a zirconium silicate-modified mesoporous silicon oxide catalyst as well as a preparation method and application thereof. The catalyst is prepared by one-step hydrothermal condensation after a template agent, a structure directing agent, a silicon source and a zirconium source are added. The invention further discloses a method for synthesizing 3-methyl-butene-1-alcohol carboxylate by adopting the zirconium silicate-modified mesoporous silicon oxide catalyst. The method is that the 3-methyl-butene-1-alcohol carboxylate is generated by the condensation and the esterification of carboxylic acid, isobutene and formaldehyde. The zirconium silicate-modified mesoporous silicon oxide catalyst disclosed by the invention is mild in preparation condition, simple in preparationprocess and high in catalytic activity, is used for the catalytic synthesis of the 3-methyl-butene-1-alcohol carboxylate and has the advantages of being good in reaction activity, high in product yield, green, environmentally-friendly and the like.

The invention discloses a glutamate dehydrogenase mutant for producing L-glufosinate-ammonium, and belongs to the technical field of gene engineering, and the amino acid sequence after mutation is shown as SEQ ID NO.1-SEQ ID NO.11. The invention also discloses a production method of L-glufosinate-ammonium, which comprises the following steps: by taking 2-carbonyl-4-[hydroxyl (methyl) phosphonyl]-butyric acid as a raw material, adding NH4<+> and coenzyme NADH / NAD<+>, then catalyzing by using the glutamate dehydrogenase mutant, and reducing and aminating the 2-carbonyl-4-[hydroxyl (methyl) phosphonyl]-butyric acid into L-glufosinate-ammonium by using glutamate dehydrogenase. A large number of glutamate dehydrogenase mutant genes are developed through the method, L-glufosinate-ammonium can be prepared from glutamate dehydrogenase mutants by using nicotinamide adenine dinucleotide (NADH or NAD<+>) which is low in price as coenzyme, the substrate conversion rate is larger than or equal to 99%, the optical purity of the product exceeds 99%, reaction conditions are mild, and the method is a green, environment-friendly and low-carbon process route, and is suitable for large-scale industrial production and application.

The invention discloses a reparation process and a treatment system for papermaking wood flour. The preparation process comprises processes of preparing of log slurry, filtering for slag removal, untwining and devillicate, screening and layered output. The treatment system comprises a preparation tank, a slag remover, a deflaker, a first slurry pool, a UV flow rising pressurized screen and a second slurry pool. The reparation process and a treatment system for the papermaking wood flour have the advantages of being high in quality consistency and binding force between fibers, low in cost and green and environmentally friendly in process.

The invention discloses a preparation method of a carbon-coated sodium titanium phosphate composite material and a preparation method of a negative pole piece. The preparation method of the carbon-coated sodium titanium phosphate composite material comprises the following steps: (1) adding a carbon source, a sodium source, a phosphorus source and a titanium source into a dispersing agent, and stirring to obtain slurry; (2) stirring and refluxing the slurry, removing part of the dispersing agent under reduced pressure, and drying to obtain a powdery precursor; and (3) pressing the precursor into a rough blank, calcining in an inert atmosphere, and cooling to obtain the carbon-coated sodium titanium phosphate composite material. The preparation method of a carbon-coated sodium titanium phosphate negative pole piece comprises the following steps: S1, mixing water-based conductive slurry, water-based glue and a solvent, adding a conductive agent and the carbon-coated sodium titanium phosphate composite material, and uniformly stirring to obtain water-based coating slurry; and S2, coating a hydrophobic carbon-coated aluminum foil with the water-based coating slurry, drying, compacting and slitting to obtain the carbon-coated sodium titanium phosphate negative pole piece. According to the methods, no harmful or corrosive gas is discharged, the methods are green and environment-friendly production processes, and the used raw materials are common and cheap.

The invention belongs to the technical field of organocatalysis and in particular relates to a preparation method and application of a polyoxometalate crystal. The preparation method disclosed by the invention comprises the following steps: by taking Na2WO4.2H2O, NaVO3.2H2O, disodium hydrogen phosphate, manganese acetate and benzyl tri-n-butylammonium chloride as raw materials, preparing the heteropolyacid crystal. Catalyzed preparation of an anti-asthma drug vilanterol trifenatate intermediate is realized by taking the polyoxometalate crystal as a catalyst. The defect in the conventional process that a strong base is adopted is overcome, the pressure for environmental protection is alleviated, the process route is green and environment-friendly, and the requirements on the conventional industrial production are met.

The invention relates to a solid acid catalyst as well as a preparation method and an application thereof. The preparation method comprises the steps of loading metal salt of heteropolyacid by virtue of active carbon, and covering the surface of the active carbon with a carbon layer, so as to obtain the stable solid acid catalyst. The solid acid catalyst can be used for catalyzing citronellol and normal butanol under a mild condition to be subjected to etherification so as to obtain citronellol butyl ether. According to the solid acid catalyst, a process is environmentally-friendly, the catalyst can be repeatedly used, the citronellol butyl ether is easy to separate, and no waste is discharged.

The invention relates to the technical field of a raw medicine preparation, and particularly relates to a preparation method of the raw medicine of environment-friendly iron sucrose. The weight-average molecular weight (Mw) of the raw medicine of the environment-friendly iron sucrose obtained by the technical scheme is 34000-60000, and the distribution coefficient (MW / Mn) is less than 1.7. The exceeding chloride Cl<-> in an iron sucrose solution is removed by selecting an anion exchange resin, and the content of Cl<-> in products is controlled at between 0.012% and 0.025%. The products are qualified by titratable alkali indexes after the products are processed by a cation exchange resin. The residual large particle impurities in the iron sucrose solution are filtered out by selecting a 0.8mu m filter membrane. The preparation method is simple and environment-friendly in technology route, high in product yield, good in quality, simple in production equipment, and easy to operate and the whole production process is easy to control, so the preparation method is suitable for scale production.

The invention discloses a production method of L-phosphinothricin. According to the method, 2-carbonyl-4-(hydroxymethylphosphonyl)butyric acid is used as a substrate and is catalyzed by an enzyme catalytic system to obtain L-phosphinothricin, and the enzyme catalytic system is composed of gamma-aminobutyric acid / alpha-ketoglutarate transaminase, glutamate dehydrogenase and a coenzyme regeneration system. The method utilizes the advantages of high catalytic activity, strong stereoselectivity and the like of transaminase, and also solves the problem of incomplete transaminase catalytic reaction, so that the catalytic reaction can completely convert the substrate 2-carbonyl-4-(hydroxymethylphosphonyl)butyric acid into L-phosphinothricin, and the conversion rate can reach 100%; no by-product alpha-ketoglutarate is accumulated in the final product of the method, and the residual amount of other substances such as the raw material glutamic acid in the product after the end of the reaction is extremely low, so the subsequent refining process of L-phosphinothricin is greatly simplified, and the total yield of the product is increased.

The invention discloses a method for preparing L-phosphinothricin through deracemization and by a biological enzyme method. According to the method, the L-phosphinothricin is obtained by taking D,L-phosphinothricin as a raw material and through catalysis by an enzyme catalysis system, and the enzyme catalysis system consists of D-amino acid oxidase, amino acid dehydrogenase and coenzyme regeneration systems. By the method, racemized D,L-phosphinothricin serves as the raw material, the D-phosphinothricin is oxidized into 2-carbonyl-4-(hydroxymethylphosphonyl)-butyric acid by the D-amino acid oxidase, and the L-phosphinothricin does not take part in the reaction and is completely retained; but the 2-carbonyl-4-(hydroxymethylphosphonyl)-butyric acid is catalytically reduced into the L-phosphinothricin by the amino acid dehydrogenase, so that in-situ deracemization of the D,L-phosphinothricin is realized, the obtained L-phosphinothricin does not contain other side products, the total yield of the products is more than or equal to 99 percent, and the optical purify can exceed 99 percent.

The invention provides a preparation method of alkyl glycidyl ether. The preparation method comprises the following steps: carrying out the following continuous flow substitution reaction on alkyl alcohol and epoxy halogenated propane in a micro-channel reactor to obtain alkyl glycidyl ether; wherein the alkyl alcohol comprises one or a mixture of more of compounds CnH<2n+1>OH shown as a formula I, and n in the formula I is 12-14; the epoxy halopropane has a structure shown as a formula II, and X in the formula II is a halogen atom. The invention solves the problems that in the prior art, whenalkyl glycidyl ether is prepared, reaction safety is poor, the number of byproducts is large, and the product yield and purity cannot be considered at the same time; the preparation method is simplein operation process, high in product purity, efficient, safe, environmentally friendly and suitable for industrial production.

The invention discloses a method for preparing 4-oxoisophorone by solid-liquid two-phase catalytic oxidation of β-isophorone. The method adopts γ-alumina supported metal composite oxide (CuO-Co 2 o 3 ‑Fe 2 o 3 ‑MgO / Al 2 o 3 ) as a catalyst. The method comprises the following steps: β-isophorone is oxidized with hydrogen peroxide in the presence of a solvent and a catalyst to prepare 4-oxoisophorone. The method has mild reaction conditions, simple process, high product yield, environmental protection, no waste liquid containing heavy metal elements, and can effectively solve the problem of non-recyclable catalyst preparation in the prior art.