10results about How to "Short reaction process" patented technology

The invention relates to the field of air filtration, in particular to a method for rapidly preparing ZIF-8 / polypropylene melt-blown cloth fiber membranes in batches at low cost. Aiming at the problems of high cost, long preparation time, complex process and the like of the existing method for growing ZIF-8 on the surface of polypropylene melt-blown cloth to improve the air filtering performance, the invention provides a method for rapidly preparing ZIF-8 / polypropylene melt-blown fiber membranes in batches at low cost. The preparation method comprises the following steps: firstly, pretreating the surface of polypropylene melt-blown cloth by using an inorganic aqueous alkali solution, then sequentially putting the melt-blown cloth into a zinc ion aqueous solution and a 2-methylimidazole / N, N-dimethylformamide mixed aqueous solution under an ultrasonic condition, and drying to prepare the ZIF-8 / polypropylene melt-blown fiber membrane. According to the preparation method, water is taken as a main solvent, and a small amount of N, N-dimethylformamide is added into the water, so that rapid growth on polypropylene melt-blown cloth at a small molar ratio of 2-methylimidazole to zinc nitrate hexahydrate is realized, and the preparation method is suitable for large-scale industrial production for air filtration.

The present disclosure relates to a method for preparing methyl methacrylate and methylacrolein from methyl propionate, the method comprising: contacting a first stream comprising methyl propionate and a formaldehyde source with a catalyst and performing an aldol condensation reaction to obtain a second stream comprising methyl methacrylate and methylacrolein; the catalyst comprises a molecular sieve with metal elements, the metal elements comprise skeleton metal elements and non-skeleton metal elements, and the molar ratio of the non-skeleton metal elements to the skeleton metal elements in the molecular sieve is less than 0.1; the skeleton metal element comprises Sn; on the basis of the total mole number of all metal elements in the molecular sieve, the content of framework tin is greater than 90 mol%; the molar ratio of the framework tin to the silicon element in the molecular sieve is (0.001-0.05): 1. According to the method disclosed by the invention, the conversion rate of methyl propionate can be effectively improved, and the selectivity of methyl methacrylate and methylacrolein is improved.

The invention belongs to the technical field of material preparation, and particularly relates to a preparation method of metal selenium and an ultrasonic enhanced impinging stream reaction system and method. According to the invention, an ultrasonic wave and impinging stream combined process is utilized, two reaction solution flow columns collide with each other, so that the contact specific surface area of the two reaction solutions and the effective collision probability between molecules are obviously increased, interphase transfer and micro-mixing of fluids are strengthened, the mass transfer rate is increased, and ultrasonic waves are introduced to strengthen the reduction reaction of selenium dioxide; pure selenium powder with good research prospects is obtained through one-step reduction of selenium dioxide, the preparation method provided by the invention realizes normal-temperature and normal-pressure reduction, the reduction efficiency is high, products are not easy to agglomerate, the reaction conditions are simple, the reaction process is short, and industrial production and application are very easily realized on the whole. According to the device, the impinging stream is adopted for preparing the pure selenium powder, and the pure selenium powder with higher purity can be more efficiently prepared through non-contact ultrasonic treatment, closed reaction equipment and no introduction of impurities.

The utility model provides a process system for preparing an olefin copolymer. The process system comprises a polymerization device; the belt type drying device is communicated with the polymerization device, so that the copolymer slurry in the polymerization device is conveyed to the belt type drying device to be dried; and the recovery device is communicated with the belt type drying device so as to recover the solvent and the monomer generated by drying in the belt type drying device. The process system for preparing the olefin copolymer can be used for industrial continuous production of maleic anhydride and olefin, the problem of rapid heat release in the polymerization process is relieved by continuously adding fresh raw materials, and rapid solid-liquid separation and solvent and monomer recovery are simultaneously realized through the belt type drying device; the copolymer does not need to be washed again to remove impurities, the problems of low efficiency and difficult wet material conveying caused by filtering are avoided, the reaction process is short, the operation is simple, and the method is suitable for industrial production.

The present disclosure relates to a method for preparing methyl methacrylate, isobutyraldehyde and methylacrolein from methyl propionate, the method comprising: contacting a first stream comprising methyl propionate and a formaldehyde source with a catalyst and performing aldol condensation reaction to obtain a second stream comprising methyl methacrylate, isobutyraldehyde and methylacrolein; the catalyst comprises a molecular sieve with metal elements, the metal elements comprise skeleton metal elements and non-skeleton metal elements, and the molar ratio of the non-skeleton metal elements to the skeleton metal elements is less than 0.1; the skeleton metal element comprises Ti; on the basis of the total mole number of all metal elements in the molecular sieve, the content of framework titanium is greater than 90 mol%; the molar ratio of the framework titanium to the silicon element in the molecular sieve is (0.001-0.05): 1. According to the method disclosed by the invention, the conversion rate of methyl propionate can be effectively improved, and the selectivity of methyl methacrylate, isobutyraldehyde and methylacrolein is improved.

The invention belongs to the field of synthesis of organic compounds, and particularly discloses a method for synthesizing N-methylmorpholine oxide without catalysis, N-methylmorpholine oxide and hydrogen peroxide are used as raw materials, N-methylmorpholine oxide is generated through azeotropic dehydration reaction under the catalyst-free condition, operation is convenient, and the reaction process is shortened; no catalyst is used, so that the problems that the catalyst is difficult to recycle, more side reactions exist and the like are solved, and the yield and the purity of the N-methylmorpholine oxide are improved; in addition, the organic solvent used in the method can be reused, so that the production cost is reduced.

The invention discloses a method for synergistically extracting key metals from mixed wastes of waste lithium batteries, relates to a method for extracting key metals from mixed wastes of batteries, and belongs to the technical field of treatment and recycling of industrial solid wastes and electronic wastes. The invention aims to solve the problems of high energy consumption and high-density carbon footprint at high temperature caused by taking a carbon source as a reducing agent in a high-temperature metallurgy method. The method comprises the following steps: carrying out reaction, tabletting, high-temperature thermodynamic reaction, deionized water washing, pyrolysis sample soaking and filtering on waste lithium battery mixed positive electrode material powder in a zirconium oxide ball milling tank of a planetary ball mill, soaking filter residues in ammonia process reduction leachate, filtering, treating the filter residues in a landfill, extracting filtrate by using an extracting agent, and carrying out backwashing to separate nickel and cobalt, and finishing. According to the method, the reaction energy consumption of high-temperature thermodynamics can be reduced, and carbon emission is remarkably reduced. The extraction process is short, and the recovery efficiency of lithium, nickel and cobalt can reach 92.5 wt.%, 96.7 wt.% and 95.9 wt.% or above by adopting the method.

This invention relates to a recombinant hirudin fusion protein with collagen affinity, its preparation method, and its applications. The fusion protein is a recombinant hirudin fusion protein incorporating a collagen-binding domain (CBD). The fusion protein of this invention possesses affinity for type I and type III collagen, and can inhibit thrombin activity to exert an anticoagulant effect. Furthermore, it can bind well to collagen-based composite materials, making it suitable for use in cardiovascular implants such as heart valves, cardiac occluders, dialysis membranes, oxygenation membranes, artificial blood vessels, and vascular stents, as well as in extracorporeal circulation and blood purification devices, enhancing anticoagulant and antithrombotic effects.

The invention belongs to the technical field of semiconductor composite materials, and particularly relates to a nano-structure Bi (at) BiOBr / TiO2 composite material as well as a preparation method and application thereof. The composite material is composed of a BiOBr / TiO2 heterojunction composite material and Bi quantum dots loaded on the BiOBr / TiO2 heterojunction composite material, the absorption band edge is 1.1-1.6 eV, and the spectral response range is widened from visible light to a near-infrared light region. According to the preparation method disclosed by the invention, the addition ratio of NaBH4, the surfactant and BiOBr / TiO2 is utilized, the reduction reaction rate is regulated and controlled, the controllable growth of the size of the Bi quantum dots and the controllable synthesis of a nano structure are realized, the precise regulation and control of the light absorption threshold of the composite material are further realized, and the minimum absorption band edge of the composite material is controlled. A reduction method is adopted for one-step reduction synthesis at normal temperature, the technological process is short, energy consumption is low, the reaction process is short, energy consumption is low, and the dosage of organic reagents is small.

The invention discloses low-melting-point spandex and a preparation method thereof.The method comprises the steps that polyhydric alcohol, diphenylmethane diisocyanate and 1, 4-butanediol are fully mixed by mass and then subjected to extrusion molding, and slices are prepared; the slices are dissolved in DMAC to prepare a polyurethane solution with the mass concentration of 35%, then a mixed amine solution is added for a chain extension reaction, a functional auxiliary agent is added after chain extension, and a polyurethane stock solution is obtained; curing the polyurethane stock solution to enable the apparent viscosity of the polyurethane stock solution to reach 6000-10000 poise; and carrying out dry spinning on the cured spinning solution to obtain the low-melting-point spandex. The low-melting-point spandex obtained in the invention can be shaped at a low temperature, can avoid or reduce damage to fabrics caused by high-temperature shaping, and can well maintain the original quality of the fabrics.