49results about How to "Potential for industrial production" patented technology

The invention discloses novel N-acetylneuraminic acid-producing escherichia coli engineering bacteria as well as a construction method and application thereof. The engineering bacterial is constructed by introducing an encoded 6-glucosamine phosphate acetylase gene, an N-acetyl glucosamine-2-isomerase gene and an N-acetylneuraminic acid synthetase gene into escherichia coli to express, carrying out strengthened expression on 6-glucosamine phosphate deaminase gene contained in the escherichia coli per se and knocking off genes, for decomposing and utilizing enzyme in metabolic pathways, of the N-acetylneuraminic acid in the engineering bacteria. The engineering bacteria disclosed by the invention can be used for fermentation culture to synthesize the N-acetylneuraminic acid by using glucose or glycerinum as a substrate.

The invention relates to the field of air purification, and particularly provides an adsorptive catalyst, and a preparation method and application thereof. The adsorptive catalyst comprises a structured carrier and a coating distributed on the inner surface and/or outer surface of the structured carrier; the total weight of the coating is standard, and the coating comprises 50-95% by weight of hydrophobic silica and 5-50% by weight of catalytically active components capable of oxidizing gaseous pollutants. The invention further provides an air purification device, and an air purification method and application thereof. The adsorptive catalyst provided by the invention can enhance the adsorption and diffusion processes of the gaseous pollutants, especially non-polar gaseous pollutants, in porous channels of the adsorptive catalyst to realize an excellent catalytic purification effect, and is particularly suitable for catalytic purification reactions under high-moisture and high-humidity working conditions. The preparation method is simple in process and low in cost and has the industrial production potential.

The invention discloses a preparation method of natural benzaldehyde by ozone collaborative heterogeneous catalysis of cinnamaldehyde or cinnamon oil. The method is as below: adding 0.5%-10% of aNiO, BaO, MgO, La2O3, SnO2 binary or ternary oxide component catalyst into a raw material cinnamic aldehyde or cinnamon oil, introducing ozone in a bubble reactor under conditions of atmospheric pressure temperature of -10 to 30 DEG C and flow rate of 0.1-5 g/L, and reacting at low temperature for 1-8 h to obtain a benzaldehyde crude product; and finally, using a molecular distillation apparatus to obtain high-purity natural benzaldehyde. The invention has the advantages of simple process, convenient operation, no toxicity or harm of the catalyst, environment-friendliness; the cinnamaldehyde is fully utilized; and the benzaldehyde has good selectivity, high yield, and natural degree intact.

The invention discloses a high-yield N-acetylneuraminic acid metabolic engineering bacterium and a construction method and application. According to the engineering bacterium, the activity of coded UDP-N-acetylglucosamine epimerase and N-acetylneuraminic acid synthetase gene enzyme is enhanced by expressing the two enzymes in Escherichia coli through a T7 strong promoter, and the recombinant Escherichia coli is constructed by removing genes of an N-acetylneuraminic acid decomposition pathway enzyme in the Escherichia coli; and a constructed engineered strain utilizes glucose or glycerinum as a substrate for fermentation cultivation to generate N-acetylneuraminic acid. The engineering bacterium utilizes glucose or glycerinum for synthesizing the N-acetylneuraminic acid, so that the fermentation level is high, the accumulated by-products are few, and the engineering bacterium has the industrial potential.

The invention discloses a porous high-entropy alloy self-supporting electrode for electrolyzing water and a preparation method thereof. The preparation method comprises the following steps: smelting, mixing and melting nickel powder, cobalt powder, chromium powder, iron powder, aluminum powder and tungsten powder, and conducting cooling to form a high-entropy alloy with an eutectic structure; cutting the high-entropy alloy into an alloy sheet, and conducting polishing to remove surface oxide skins; then carrying out dealloying treatment; and after dealloying treatment is completed, taking out the alloy sheet and carrying out ultrasonic treatment so as to obtain the self-supporting electrode. The invention provides a simple, efficient and controllable dealloying means for treating the high-entropy alloy sheet to obtain the sheet-shaped high-entropy alloy self-supporting catalytic electrode with a multi-scale pore structure, and the sheet-shaped high-entropy alloy self-supporting catalytic electrode is proved to have excellent electro-catalytic hydrogen evolution/oxygen evolution reaction activity and stability.

The invention discloses a method for preparing a cellulose solution.According to the basic technical principle of the method, the wetting property of a solvent on natural cellulose crystals is improved with the amphipathicity of the cellulose solvent so that dissolution of cellulose can be promoted.Based on the principle, the invention provides a room-temperature mild dissolution technical method for cellulose.The method has the advantages that the technology is simple, room-temperature dissolution is achieved, and the method is environmentally friendly and not sensitive to the moisture content of a system.The cellulose solvent is prepared from, by weight, 5-70% of organic base, 2-90% of an assistant and 1-65% of water.Cellulose and the cellulose solvent are blended to form a blend, stirring is carried out until complete dissolution, and the target cellulose solution is obtained.The cellulose solution prepared with the method is used for manufacturing regenerated cellulose membranes or regenerated cellulose fibers or cellulose-base composites.

A method for producing paeonoside metabolic hormone-I by fermenting short Lactobacillus is carried out by inducing L.brevis AS 1.12 into culture medium with tomato juice 200g/L, protein peptone 7.5g/L, yeast paste 7.5g/L, glucose 10g/L, Tween-80 0.3 ml/L and pH=7.0-8.5, anaerobic culturing at 25-37 degree for 12-24 hrs, centrifugal collecting bacterial cells, washing by normal saline, centrifuging, dispersing obtained cells into buffer liquid of 0.05M phosphate, adding into substrate paeonoside or its analogs hydroxy-paeonoside or methyl-paeonoside or benzoyl-paeonoside or mixture of paeonoside and its analogs, converting at 30-40 degree for 2-24 hrs, extracting by ethyl acetate, drying concentrated extract to obtain concrete, chromatographying by silica-gel column to obtain final product. It's simple, cheap, efficient, fast and controllable and has friendly environment. It can be used for anti-inflammatory, stress ulcer, analgesic and antispasmodic, ecstatic coronary blood vessel, myocardial ischemia and platelet aggregation-inhibition.

The invention provides a feed antibacterial agent containing a copper-carrying X-type molecular sieve and a preparation method of the feed antibacterial agent. Aiming at the defects of the traditionalmethod for preparing the X-type molecular sieve material at present, the invention provides a method for synthesizing the X-type molecular sieve from diatomite as a silicon source and part of aluminum source with a hydrothermal method; a copper-carrying molecular sieve antibacterial material is further prepared from the X-type molecular sieve as a carrier with an ion exchange method, and accordingly, antibiotics in feed are replaced. Harm of the antibiotics to people and animals is greatly reduced. The antibacterial agent has obvious advantages in preparation cost, product performance, process flow, environmental friendliness, cost performance and the like; the raw materials are from natural minerals, thereby being richly sourced and low in cost; the synthesis process is green and environmentally friendly, the equipment requirement is low, the product performance is high, and industrial production potential is achieved.

The invention relates to a preparation method of nicotine and an intermediate thereof, wherein the intermediate has a structure as shown in a formula (II), X1, X2 and X3 are respectively and independently CR2R3, R1 is a C1-6 alkyl group, and R2 and R3 are each independently H or a C1-6 alkyl group. According to the invention, the preparation method of the nicotine and the intermediate thereof has the advantages of simple operation, mild reaction conditions, easily available raw materials, and high conversion rate, can effectively reduce the production cost of the nicotine, and has the potential of industrial production, and each reaction can be directly post-fed through simple post-treatment basically.

The invention belongs to a method for preparing a zeolite molecular sieve and relates to a method for preparing a NaX-type zeolite molecular sieve pure phase by using clay. The method comprises the following steps: stirring and mixing clinker prepared by mixing and calcining clay and sodium carbonate with sodium metaaluminate and water into colloid, crystallizing, filtering, washing and filtering to obtain the NaX-type zeolite molecular sieve pure phase. The filtered mother solution is recycled and serves as one part of the raw material. The mother solution is recycled, so that the synthetic cost is reduced, waste discharge is avoided, and the environment is not polluted. The method has obvious advantages in aspects of preparation cost, product performance, process flow, environment friendliness and economic profits, and the raw material source is rich, the cost is low, the synthesis simple and convenient, the equipment requirement is low, the product performance is high and the industrial production potential is high.

The invention discloses a modification method for a collector electrode material of an electrolytic cell for water-electrolytic hydrogen making. The method includes the following steps that nitrate, an iridium compound and a solvent are fully mixed to form a solution; a pre-treated collector electrode material of the electrolytic cell for water-electrolytic hydrogen making is soaked in the solution, then dried, calcined, cooled, washed and dried, and a modified collector electrode material of the electrolytic cell for water-electrolytic hydrogen making is obtained, or the steps that the nitrate, the iridium compound and the solvent are fully mixed, subjected to ball-milling, dried and sieved to obtain a mixture, the pre-treated collector electrode material of the electrolytic cell for water-electrolytic hydrogen making is uniformly covered with the mixture, then calcined, cooled, washed and dried, and the modified collector electrode material of the electrolytic cell for water-electrolytic hydrogen making is obtained. The modified collector electrode material, prepared by the method, of the electrolytic cell for water-electrolytic hydrogen making serves as an anode electrode of the electrolytic cell, the electric potential is obviously lowered in the electrolytic process, and the activation impedance and ohmic impedance of the electrolytic cell are obviously reduced.

The invention relates to a method for preparing creatine in a catalyzed mode. According to the method, S-methyl isothiourea sulfate and potassium sarcosinate are adopted as raw materials and are further prepared into creatine, utilization of highly-toxic ammonia cyanide is avoided, and production safety is effectively ensured. Meanwhile, a phase transfer catalyst is added in the reaction process, the reaction is carried out in an alcohol/water system, dissolvability of the materials can be guaranteed, and the sufficient conversion of the materials can be promoted under the action of the catalyst. The method in the technical scheme has the advantages of being environmentally friendly, high in yield and short in reaction time and has a wide industrialization prospect.

The invention discloses a method for catalyzing conversion of lignin into guaiacol as a single chemical by lewis acid. According to the method, the lignin is catalyzed to be converted into the guaiacol in an inert atmosphere with lewis acid as a catalyst, and the guaiacol is the only liquid product. The lewis acid comprises at least one of iron trifluoromethanesulfonate, ytterbium trifluoromethanesulfonate and lanthanum trifluoromethanesulfonate. According to the method, the catalytic system is simple in composition and green, the liquid product yield is high, only guaiacol is a liquid product, and other residues are solids. The invention provides a new way for preparing the guaiacol, provides a new method for preparing high value-added platform molecules, especially important chemicals from a traditional fossil resource route, for oriented conversion of lignin, and also provides a new thought for resource utilization of lignin. The method is a green and sustainable lignin carbon resource catalytic conversion strategy, and the dependence of chemical industry on fossil resources can be reduced.

The invention relates to a preparation method of a perovskite oxide catalyst containing alloy particles, and the method comprises the following steps: S1, mixing raw materials and a solvent, and carrying out ball milling to obtain a mixture A, wherein the raw materials comprise Co3O4, La2O3, SrCO3 and Fe2O3; S2, roasting the mixture A to obtain a sample B; S3, roasting the sample B in mixed gas of reducing gas and inert gas to obtain a product. Through an electrochemical test, the product obtained by the preparation method of the perovskite oxide catalyst containing the alloy particles can be used as an electrocatalyst, and the overpotential required by hydrogen production by water decomposition can be remarkably reduced, so the electrocatalytic performance is improved, the energy waste is reduced, and the energy utilization rate is improved.