399results about How to "Speed ​​up the reaction process" patented technology

The invention provides a method for treating farmland soil polluted by cadmium. The method integrates technical measurements such as seepage-proofing isolation, chemical stabilizing treatment, phytoremediation and the like, and comprises technical steps as follows: sampling detection, repairing range determination, dredging of river systems, surface soil stripping, bottom layer grinding, clay pavement, laying of a seepage-proofing isolating membrane, surface soil backfilling, addition of a chemical stabilizing agent, plant planting and harvesting, incineration and ashing, ash content stabilizing and curing treatment, terminal treatment and the like. The method for treating the farmland soil polluted by cadmium has the advantages of on-site treatment, simple process, convenience in construction, instant effect, high efficiency, low cost and the like, and is wide in popularization and application prospect.

The invention discloses a composite curing agent for dredged silt in a watercourse, comprising a powdered agent and a liquid agent, wherein the powdered agent consists of the following components on the basis of 100 percent of the total mass fraction: 15-25 percent of cement, 45-65 percent of pozzolanic material, 10-20 percent of alkali activator and 5-10 percent of salt activator; and the liquid agent consists of the following components on the basis of 100 percent of the total mass fraction: 2-7 percent of polyvinyl alcohol, 2-7 percent of polyacrylamide, 0.5-1 percent of melamine sulfonate formaldehyde condensate and the balance of water. The dredged silt has high compressive strength after being solidified by the composite curing agent for the watercourse silt, and can meet the requirements of road construction.

The invention discloses a magnetorheological fluid multi-stage treatment device and a control method and component manufacturing method thereof and belongs to the technical field of machine manufacturing. The magnetorheological fluid multi-stage treatment device comprises a preposition piston cylinder, a middle piston cylinder, a postposition piston cylinder, a preposition piston, a middle piston, a postposition piston, a preposition filtering box, a middle filtering box, a postposition filtering box, a preposition filtering mesh, a middle filtering mesh and a postposition filtering mesh. The preposition piston cylinder is connected with the preposition piston through a bolt, the preposition bolt is matched with an inner cavity of the preposition filtering box, the preposition filtering box is vertically arranged, and the axis is in the vertical direction; meanwhile, the invention further provides corresponding control method and a key component manufacturing method of the device. According to the magnetorheological fluid multi-stage treatment device and the control method and component manufacturing method thereof, a two-standing three-filtering mode is adopted to filter mixed liquid, the characteristic of the mixed liquid at each stage is fully utilized, and the purpose of fast and thoroughly separating magnetic substances and solvent is finally achieved.

The invention relates to a method for producing ethyl acetate by reaction rectification and pervaporation coupling. The method is as follows: raw materials, namely acetic acid and ethanol are catalyzed in a reaction rectification tower and rectified, an organic phase is separated out from the distillate at the top of the tower and passes through a pervaporation permeable film component, wherein the contained water and ethanol selectively permeate the film and then enrich on the permeable side of the film to be removed; the ethyl acetate is obtained from the non-permeable side of the film; and part of the ethyl acetate as dehydrating agent is returned to the reaction rectification tower while the rest as a product is extracted; at the same time, part of liquor extracted from the tower bottom of the reaction rectification tower is introduced into another pervaporation permeable film component, the contained moisture is enriched on the permeable side of the film to be separated and removed, the ethyl acetate is obtained from the non-permeable side of the film, and the ethyl acetate is circularly returned to an acetic acid feeding hole of the reaction rectification tower. Compared with the prior art, the method can reduce reflux ratio greatly, has the advantages of simple technical route, energy saving, environmental protection and compact device, and reduces equipment investment and production cost for the ethyl acetate remarkably.

The invention discloses a preparation method of a hollow fiber nanofiltration membrane, and provides the preparation method of the hollow fiber nanofiltration membrane continuous in technical process, uniform in nanofiltration functional layer and few in deficiencies. The method comprises the following steps of: using polyelectrolyte aqueous alkali as an outer coagulating bath and a mixed liquor of water and a solvent for the coagulating bath as an inner coagulating bath, spinning and forming a hollow fiber nanofiltration membrane spinning and membrane forming system through a hollow spinning nozzle and a double diffusion process, and initially curing and forming a hollow fiber membrane; and adding the initially cured hollow fiber nanofiltration membrane into an aqueous liquor of polyamine, erasing the suspended liquid on the surface, adding the membrane into an organic liquor of polyacyl chloride, and drying and curing the membrane to obtain the hollow fiber nanofiltration membrane. The method provided by the invention is continuous in technical process, uniform and controllable in nanofiltration functional layer and few in defects, and has a wide prospect in the fields of seawater and brackish water desalination, treatment and recovery of sewage and wastewater, preparation of ultrapure water and the like.

The present invention discloses a nitrifying bacterial growth promoting agent, which comprises, by weight, 40-100 parts of a metal salt and 5-30 parts of a polyamine substance, preferably 50-80 parts of a metal salt and 10-20 parts of a polyamine substance, wherein the metal salt is a calcium salt, a magnesium salt, a ferrous salt and a copper salt, and a molar ratio of Ca<2+> to Mg<2+> to Fe<2+> to Cu<2+> is (5-15):(5-25):(1-8):(0.5-5), preferably (8-12):(10-20):(2-6):(1-4). According to the present invention, the formula of the nitrifying bacterial growth promoting agent is simple, the preparation is easy, the nitrifying bacterial growth promoting agent can be used for the nitrifying bacterial culture process and can further be directly poured into the sewage treatment system so as to make the nitrifying bacteria rapidly grow and breed within a short time, and the culture nitrifying bacteria have characteristics of high activity and strong impact resistance.

The invention discloses a composition for rapidly culturing nitrifying bacteria. The composition comprises the following components in parts by weight: 40-100 parts of metal salts, preferably 50-80 parts of metal salts, 5-30 parts of polyamine substance, preferably 10-20 parts of polyamine substance, and 0.5-15 parts of hydroxylamine organic acid, preferably 2-10 part of hydroxylamine organic acid, wherein the metal salts comprise calcium salt, magnesium salt and copper salt, and the molar ratio of Ca<2+> to Mg<2+> to Cu<2+> is (5-15) to (5-25) to (0.5-5), preferably (8-12) to (10-20) to (1-4). The composition is simple in formula and easy to prepare, can be used in a culture process of nitrifying bacteria, and also can be directly fed into a sewage treatment system, so that the nitrifying bacteria can rapidly grow and breed within a short time, and the cultured nitrifying bacteria have high activity and strong impact tolerance.

The invention discloses a preparation method of hemicellulose-based heavy metal ion adsorbent mainly comprising conducting graft copolymerization triggered by free radial under the intensifying effect of ultrasonic. The adsorbent prepared by the invention not only retains excellent properties of hemicellulose, but also has heavy metal ion absorption capacity. The adsorbent is an important adsorbing material with sustainable development.

The invention discloses a high-dispersive-distribution nano-TiB2 particle reinforced aluminum matrix composite material and a preparation method thereof. Firstly, a uniform-structure Al-TiB2 intermediate alloy is prepared through an ultrasound assisted mixed salt reaction (K2TiF6/KBF4-Al), wherein the average particle diameter of in-situ endogenous TiB2 particles is smaller than 100nm; the Al-TiB2 intermediate alloy and Al are used as raw materials, or Al-TiB2 intermediate alloy, Al and alloy elements are used as raw materials, the nano-TiB2 particles are introduced into an aluminum (alloy) matrix through an intermediate alloy dilution method, ultrasound agitation treatment is used as assistance, then pouring into a mold is performed, and ultrasound is applied during solidification (introduction through a bottom introduction method); and thus the high-dispersive-distribution nano-TiB2 particle reinforced aluminum matrix composite material is obtained.

The invention provides a method for preparing modified nanosilicon dioxide. Firstly, nanosilicon dioxide is reunited as little as possible by adding chitosan during the nucleation process, thereby obtaining modified nanosilicon dioxide which is uniform, steady and excellent in dispersivity. Secondly, ethylene diamine tetraacetic acid and the nanosilicon dioxide react to enable the surface of the ethylene diamine tetraacetic acid to modify a certain amount of amino. Thirdly, silanol and aminosilylation are arranged on the outer layer of the nanosilicon dioxide, added stannous chloride enables the silanol and the aminosilylation to have excellent activities to epoxy groups, speeds up reaction progress, and greatly improves modified grafting ratio of surface of the nanosilicon dioxide.

The invention provides a carbon tetrachloride polluted water source treatment device and application thereof. The device comprises a water inlet tank, a simulated soil layer tank and a water outlet tank, wherein the water inlet tank is connected with the simulated soil layer tank through a left partition; the simulated soil layer tank is connected with the water outlet tank through a right partition; the lower part of the left partition is provided with an influent water guide tube set; the influent water guide tube set is communicated between the simulated soil layer tank and the water outlet tank; and the inner side of the bottom of the simulated soil layer tank is vertically provided with a reaction well casing set. The treatment device provided by the invention can effectively remove the carbon tetrachloride pollutant in the water body, and can not generate secondary pollution.

The invention relates to preparation of a rice starch-based fat replacer, in particular to a method for preparing high-purity low-DE (dextrose equivalent) value malto dextrin by utilizing rice. The method comprises the following concrete steps of: smashing and sieving rice, soaking and extracting with alkali liquor; then centrifuging to remove supernate and surface layer and lowermost yellow residue, and drying for 40-50 hours to obtain rice starch; mixing rice starch feed liquor with water at the mass percent ratio of 1:(4-6); then adding alpha amylase to ensure the alpha amylase to account for 0.5-1.5% of size in mass fraction, carrying out enzymolysis for 10-15 minutes at the temperature of 85-95 DEG C, centrifuging for 8-12 minutes, freezing the supernate, and carrying out freeze drying treatment after the supernate is completely frozen, thus malto dextin is obtained. By adopting the method in the invention, the high-purity low-DE value malto dextin fat replacer is prepared, and preparation process of the malto dextin is changed while basic physicochemical properties of the malto dextin are not changed, thus the aims of energy conservation and consumption reduction are achieved during preparation of the malto dextin.

The invention discloses a multi-phase pipe type cyclone reactor. The multi-phase pipe type cyclone reactor comprises a flow speed regulation cyclone device, a gas-phase injector, a reaction pipe and a discharging control valve, wherein the flow speed regulation cyclone device is composed of a feeding pipe, a cyclone pipe, a cyclone tangential slit, a flow speed regulation valve and an outer jacket. A liquid phase enters the flow speed regulation cyclone device from the feeding pipe; axial flowing is changed into cyclone flowing and rotary and axial common flowing is formed in the cyclone reaction pipe; a cyclone flow speed of the liquid phase is regulated by conveniently and accurately regulating the size of an inlet of the cyclone tangential slit through the flow speed regulation valve, and the mixing strength of different reaction systems and the retention time in reaction pipe systems are realized; the multi-phase pipe type cyclone reactor disclosed by the invention is simple in structure, less in investment, convenient to operate and strong in adaptive capacity and is suitable for industries including metallurgy, chemical industry, materials, sewage treatment, medicines and the like.

The invention relates to an aqueous epoxy corrosion-resistant coating for mechanical equipment. According to the aqueous epoxy corrosion-resistant coating, a component A comprises an aqueous epoxy resin emulsion, a rheological agent, a wetting and dispersing agent, a defoaming agent, an organic preservative, an inorganic anti-rust pigment, a pigment filler, deionized water and a film-forming aid, a component B comprises an aqueous polyamine-epoxy resin adduct, deionized water, a silane coupling agent, a promoter and a reactive epoxy toughening agent, and the aqueous epoxy corrosion-resistant coating is prepared by preparing the component A, preparing the component B and mixing the component A and the component B. Test results show that under the situation of coating a 150mu m wet film, the surface drying time is less than 40min, the solid drying time is less than 12h, the thickness of a dry film is 80mu m, a coating has no cracks under the impact condition of 120kg.cm, an anti-flash rust agent which produces harm to a human body or an environment is eliminated, and the aqueous epoxy corrosion-resistant coating is environment-friendly and high in safety.

The invention relates to a synthetic method for ceftaroline fosamil. According to the synthetic method, 7-phenylacetamide-3-hydroxy-3-cephalosporin-4-carboxylate-diphenylmethyl is selected as a raw material to be chloridized and reacts with 4-(4-pyridyl)-1,3-thiazole-2-thiol sodium salt at a C-3 site to obtain a thioether compound, p-cresol and immobilized penicillinase are adopted for removing carboxyl and amino protecting groups respectively, the thioether compound and the acylated AE-active ester are subjected to C-7 site condensation reaction, and crystallization in acetic acid is performed after hydrolyzation to prepare the ceftaroline fosamil successfully. The preparation method has the advantages that use of toxic and harmful substances such as trifluoroacetic acid and phosphorus pentachloride is avoided, reaction conditions are moderate, side reactions are few, technology is simple, yield and product purity are high, cost is low, raw materials are cheap and easy to obtain, and the preparation method is applicable to industrial production.

The invention belongs to the field of pesticides, relates to a technology for preparing agricultural fungicide intermediates and particularly relates to a technology for preparing boscalid intermediate 2-(4-chlorophenyl) aniline. The technology comprises the following steps of by adopting alcohol or formamide solvent, in an alkaline reagent and a KI system, under the action of Pd catalyst, carrying out Suzuki coupling reaction on o-chloronitrobenzene and p-chlorophenylboronic acid as raw materials to generate 2-(4-chlorophenyl)nitrobenzene, simply filtering the reaction system and directly carrying out catalytic hydrogenation on the reaction system to obtain the product. By the technology, the problems of high price of the raw materials, low yield, complex after-treatment and harsh reaction conditions of the traditional synthesis process of the boscalid intermediate are solved, the simple reaction is achieved in a true sense, the manufacturing cost is decreased, the content and yield of the product are increased and the technology is more conducive to industrial production.

The invention discloses a preparation method of a 3,3-bi(nitrine methyl) epoxybutane and tetrahydrofuran copolymer, relates to a preparation method of the 3,3-bi(nitrine methyl) epoxybutane and tetrahydrofuran copolymer, and in particular relates to a method for preparing the 3,3-bi(nitrine methyl) epoxybutane and tetrahydrofuran copolymer by performing ring opening copolymerization and catalytic nitrogenization on 3,3-bi(chloromethyl) epoxybutane. The method is simple and easy to carry out. Because a method for preparing bi(chloromethyl) polyether at first and nitriding at last to obtain a nitrine rubber product is adopted, a high-sensitivity nitrine monomer purification step is avoided, the safety hidden troubles of operation site are eliminated, and the problem of an existing production method is solved. In a process for preparing the nitrine rubber by nitrogenization of the bi(chloromethyl) polyether, a method of addition of sodium iodide is adopted, and double-decomposition exchange reaction on iodine atoms of halogen elements and chloride atoms in the bi(chloromethyl) polyether is utilized, so that a nitrogenization reaction process is accelerated, and the complete nitrogenization reaction is carried out; and therefore, the reaction effect is achieved and the product quality is greatly improved.

The invention relates to a preparation method for a cephalosporin anti-infective drug-cefazedone sodium, belonging to the field of pharmaceutical synthesis. According to the invention, the method uses GCLE as a raw material to substitute 7-ACA and overcomes the defects of low yield, high pollution and the like in prior art; the preparation method with mild reaction conditions, little side reaction and simple process is provided; meanwhile, the method has the advantages of cheap and easily-available raw materials, low cost, high product yield, high product purity and applicability to industrial production.

The invention discloses a ligand-free atom transfer radical polymerization method under the action of alkali. The method is characterized by comprising the following step: mixing reaction raw materials comprising a monomer, an initiator and a catalyst without using a ligand under the action of alkali, so that the monomer is subjected to atom transfer radical polymerization reaction to generate a corresponding polymer. The ligand-free atom transfer radical polymerization method improves the reaction raw materials adopted in the key atom transfer radical polymerization reaction, uses alkali to participate in the reaction, can further optimize components of an atom transfer radical polymerization system, overcomes defects that toxic and volatile organic compounds or polar solvents used by the atom transfer radical polymerization system as the ligands are expensive, highly toxic and volatile in the prior art, and reduces the degree of damage to the environment and the reaction cost.