135results about How to "Easy post-processing" patented technology

The invention discloses a catalyst system for methanol low-pressure carbonyl synthesis of acetic acid, and relates to the technical field of methanol low-pressure carbonyl synthesis of acetic acid, the catalyst system comprises a group VIII metal main catalyst, an iodomethane cocatalyst, an inorganic iodide, and an ionic liquid with [NR1R2R3R4] < + > [CH3COO] <-> as a catalyst stabilizer, r1, R2, R3 and R4 in the ionic liquid are alkyl, aryl and acyl containing 4-9 carbons or a combination thereof, and when the catalyst system is applied to a process for synthesizing acetic acid by methanol low-pressure carbonyl, a metal catalyst can be kept stable under the condition of low water content, so that the separation energy consumption of a subsequent rectification system is reduced.

The invention discloses a method with high catalyst stability for low-pressure carbonyl synthesis of acetic acid from methanol, and relates to the technical field of low-pressure carbonyl synthesis of acetic acid from methanol, and the method comprises the following steps: S1, reaction section: introducing methanol or a reactive derivative thereof and CO into a reactor, adding a group VIII metal catalyst, an iodomethane cocatalyst and inorganic iodide, and carrying out a reaction for 2-4 hours; the preparation method comprises the following steps: by taking a raw material as a raw material and an ionic liquid with a [NR1R2R3R4] < + > [CH3COO] <-> structure as a catalyst stabilizer, carrying out carbonyl synthesis reaction on the material in a reactor to obtain an acetic acid crude product, and in the formula, R1, R2, R3 and R4 are alkyl, aryl and acyl containing 4-9 carbons or a combination thereof; s2, carrying out gas-liquid separation; s3, evaporating and washing; s4, light component removal treatment; and S5, purification treatment, so that the VIII group metal catalyst can still keep stable when reactants are in a reaction system with low water content of 0.5-1.0%, the energy consumption of a rear-end dehydrating tower and a finished product tower is reduced, and the production cost is reduced.

The invention discloses a built-in heat exchange double fluidized bed reaction device, which is used for a biomass raw material hydrogen production process, and comprises: a gasification chamber, which is of a cylindrical structure and is provided with a conical surface at the bottom, and the conical surface is provided with a hole for introducing bubbling fluidizing air; the combustion chamber is of a tubular structure and is arranged in the gasification chamber in a sleeved mode, the bottom of the combustion chamber is in an open state, and the combustion chamber is arranged in the conical surface area and used for introducing vertically-upward combustion-supporting air; the material returning units are arranged at the upper part of the reaction device, are uniformly arranged along the circumferential direction and are used for carrying the high-temperature bed material particles from the combustion chamber to an annular gasification area outside the combustion chamber and mixing the high-temperature bed material particles with biomass raw materials in the gasification area to produce hydrogen; the material returning unit is provided with a loosening chamber and a material returning chamber, and a bottom plate of the loosening chamber is obliquely arranged towards the material returning chamber. Through the built-in design of the double fluidized beds, the feeding pipe and the return feeder are prevented from being exposed at room temperature, and the heat loss of the reactor is reduced; and meanwhile, the device can provide enough regeneration time for the bed material under the condition of keeping a relatively high solid conveying rate.

The present invention provides a chemical synthesis method of EPS-G7, wherein β-cyclodextrin A is acetylated to obtain β-acetylcyclodextrin B, B is ring-opened in a mixed solution of acetic anhydride / concentrated sulfuric acid to obtain a chain acetylated heptose C, p-nitrophenol is condensed with intermediate C using boron trifluoride acetonitrile to obtain a key intermediate p-nitrophenyl (G1)-O-acetyl-D-maltoseptaglycoside D with α as the dominant configuration, D is removed from the acetyl group under the action of sodium methoxide to obtain pNP-G7 (p-nitrophenyl (G1)-D-maltoseptaglycoside), pNP-G7 is in the presence of p-toluenesulfonic acid and dimethoxyethane, and acetal protection is formed between the hydroxyl groups on C4 and C6 of the terminal monosaccharide to obtain EPS-G7. The reaction raw materials used in the method of the present invention are cheap and readily available, and the chemical synthesis of α-amylase detection reagent EPS-G7 is realized, which is a simple, economical and efficient synthesis method.

The invention discloses a synthesis method of dotenorad. The invention provides a preparation method of a compound B. The preparation method comprises the following step: reacting 3, 5-dichloro-4-hydroxybenzoic acid with a compound A to generate the compound B in an organic solvent under the action of a condensing agent. The preparation method provided by the invention is short in step, high in reaction yield, high in purity, low in three-waste generation amount, low in production cost and high in product quality, and is a green and environment-friendly preparation method. # imgabs0 #

The invention belongs to the technical field of organic synthesis of pesticides, and discloses a synthesis method of pyroxasulfone. The synthesis method of pyroxasulfone comprises the following steps: taking an intermediate A as shown in a formula (I) and a sulfonating agent, and adding a catalyst for reaction to obtain an intermediate B as shown in a formula (II); taking the intermediate B and an intermediate C as shown in a formula (III), and reacting under an alkaline condition to obtain pyroxasulfone. According to the synthesis method of pyroxasulfone, reaction steps are reduced, and the process duration and the production period of pyroxasulfone are greatly shortened; the used raw materials are low in cost and easy to obtain, the reaction conditions are mild, and oxidants such as hydrogen peroxide are not needed; meanwhile, few three wastes are generated in the technological process, and the method is environmentally friendly, is suitable for green large-scale production, and is a green synthesis method which is efficient, environmentally friendly and easy to control.

The invention discloses a preparation method of fiazonetin, and belongs to the technical field of medicinal chemistry. According to the route, 2-halo-3-methylpyrazine which is low in price and easy to obtain is used as a raw material and sequentially reacts with hydrazine hydrate and orthoester, and then a hydrogenation reduction reaction is performed to generate a compound 4; carrying out chiral resolution or chiral separation on the compound 4 and carrying out condensation reaction on the compound 4 and p-fluorobenzoyl halide to obtain an intermediate compound 5 or 5'and a new intermediate compound 6; reacting the compound 6 with a halogenating reagent to obtain a compound 7; carrying out Suzuki coupling reaction on the compound 7 and a compound 8 to obtain a compound, namely, the compound of the formula A, namely, non-azonepan; according to the route, the raw materials are simple, easy to obtain and low in cost; the reaction is simple, the preparation efficiency is high, and the reaction yield of each step can be higher than 90%; no harsh reaction conditions exist, and operation is safe; post-treatment is simple and convenient, and environmental pollution is low. The method is suitable for large-scale production; a high-chiral product can be obtained, the chiral purity value of a final product is as high as 99.5%, and the method has relatively good market value and profound practical significance. # imgabs0 #

The invention relates to a branched polymer for selective water control of an oil well and a preparation method thereof, and belongs to the technical field of oilfield chemistry. The preparation method comprises the following steps: firstly, carrying out formylation modification on nano-cellulose by using an oxidizing agent, then carrying out Schiff base reaction on the formylated nano-cellulose and polyethylene polyamine to realize amination modification, and then reducing the nano-cellulose by using a reducing agent to improve the dispersity and reaction activity of the nano-cellulose. On the basis, through an oxidation-reduction reaction between the aminated nanocellulose and Ce < 4 + >, a nonionic water-soluble monomer, an anionic water-soluble monomer, a hydrophobic monomer and the like are used as raw materials, and a polymer with a branched structure is prepared through aqueous solution polymerization. The branched polymer has high molecular rigidity, and the temperature resistance, salt resistance and retention capacity of the branched polymer are remarkably improved. Tests show that the branched polymer still keeps an excellent selective water control effect under long-term scouring of a large amount of liquid.

The invention discloses a synthesis method of a trivalent GalNAc compound, which comprises the following steps: under the action of a condensing agent and organic alkali, reacting carboxyl-containing D-galactosamine pentaacetate as shown in a formula I with carbobenzoxy-protected diamine as shown in a formula II to obtain an intermediate III; under the hydrogen atmosphere, the intermediate III reacts under the catalysis of palladium carbon to remove a carbobenzoxy protecting group, and an intermediate IV is obtained; under the action of a condensing agent and organic alkali, the intermediate IV reacts with tri [(2-carboxyl ethyoxyl) methyl] methyl benzyl carbamate, and the trivalent GalNAc compound shown in the formula V is obtained. The method is simple and rapid in reaction process, mild in condition, simple and convenient in post-treatment, and high in target product yield which at least reaches about 55% and is obviously higher than that in the prior art.

This invention discloses a method for preparing and detecting a fluorescent probe for detecting changes in mitochondrial viscosity in organisms, belonging to the field of chemical analysis and detection technology. Triphenylbromoethylene and a five-membered heteroaromatic compound containing aldehyde and boric acid groups are dissolved and reacted with a catalyst; isopropanol is removed by cooling and vacuum evaporation, followed by water extraction, solvent removal, and column chromatography to obtain ND-SF-1; ND-SF-1 is mixed with 4-pyridineacetonitrile, anhydrous ethanol is added, piperidine is added dropwise, the mixture is heated, cooled, and refluxed, then cooled to room temperature, and the precipitated solid is washed to obtain ND-SF-2; ND-SF-2, 3-bromopropyltrimethylammonium bromide, and potassium iodide are mixed and added with acetonitrile, heated, and then cooled to room temperature, and the precipitated solid is collected and washed to obtain ND-SF-3; ND-SF-3 and potassium hexafluorophosphate are mixed and added with acetonitrile, heated, and then cooled to room temperature, and the solid is collected and washed to obtain the fluorescent probe. The fluorescent probe provided by this invention is simple to prepare, low in cost, highly sensitive, selective, and biocompatible; it can sensitively detect changes in mitochondrial viscosity in organisms.

The utility model relates to a double-channel cutting machine with V-shaped configuration. The double-channel cutting machine comprises a first feeding side pinch belt, a second feeding side pinch belt and a third feeding side pinch belt, a second feeding side pinch belt; the first discharging side clamping and conveying belt corresponds to the first feeding side clamping and conveying belt through a gap; the second discharging side clamping and conveying belt corresponds to the second discharging side clamping and conveying belt in a clearance manner; and the cutter point track of the cutter during rotation passes through the gap. The first feeding side clamping and conveying belt and the second feeding side clamping and conveying belt are correspondingly arranged in the cutting main machine at a V-shaped inclination angle. Correspondingly, the first discharging side clamping and conveying belt and the second discharging side clamping and conveying belt are correspondingly arranged in the cutting main machine at the V-shaped dip angle. The blade point track of the cutter covers the whole section of the long-strip-shaped raw material and the other long-strip-shaped raw material, so that the long-strip-shaped raw material and the other long-strip-shaped raw material are cut off to produce a plurality of finished products. The double-channel cutting machine disclosed by the utility model can be used for efficiently cutting wide long-strip-shaped materials under the conditions of low equipment cost and compact equipment configuration space.

The utility model discloses an embedded culvert sewage intercepting device, which is characterized in that a plurality of drainage pipelines are arranged on the side wall of an embedded culvert at intervals, and the end parts, positioned in the embedded culvert, of the drainage pipelines are drainage ends; a filtering structure is arranged between the drainage end of the drainage pipeline and the extension pipe; the drainage end of the drainage pipeline is downwards connected with a blow-off pipe, and an electric butterfly valve is mounted on the blow-off pipe; a collecting frame is fixedly installed in the buried culvert and arranged below the blow-off pipe, the lower portions of the two ends of the collecting frame penetrate through each other, and a scraping assembly is installed in the collecting frame. And the end part of the extension pipe is positioned on the outer side of the collection frame. The buried culvert sewage intercepting device has the advantages of being capable of filtering and separating impurities and collecting the impurities so as to facilitate post-treatment.

The invention provides a deuterated phenyl carbazole compound and a preparation method thereof, and belongs to the field of organic photoelectric materials. The preparation method of the deuterated phenylcarbazole compound provided by the invention comprises the following steps: mixing a phenylcarbazole compound, decahydronaphthalene, deuterium water and a catalyst, and carrying out a deuteration reaction to obtain the deuterated phenylcarbazole compound, the catalyst is any two combinations of different transition metals in Pd / C, Pt / C, Ru / C, Rh / C, Ir / C and PtO2. The deuteration efficiency and the deuteration rate of the deuterated phenyl carbazole compound can be improved by taking the decahydronaphthalene as the solvent; the high deuteration rate is realized in a mode of combining two different transition metals. The average deuteration rate of the deuterated phenyl carbazole compound prepared by the preparation method provided by the invention can reach 72.7-87.4%, and the deuterated phenyl carbazole compound has a relatively high deuteration rate.

The invention discloses a tripterine acrylamide derivative with a structure shown as a formula III, wherein A1 and A2 are respectively and independently selected from O and NH; l is selected from-(CH2) n-and-((CH2) 2O) m (CH2) 2-, n is an integer ranging from 2 to 6, and m is an integer ranging from 1 to 6; r1 and R2 are respectively and independently selected from H, # imgabs0 # R3 and R4 are respectively and independently selected from C1-C4 alkyl, or R3 and R4 are connected with each other to form a 5-7-membered heterocyclic ring containing one oxygen atom together with an oxygen atom, or R3 and R4 are connected with each other to form a 5-7-membered heterocyclic ring together with a nitrogen atom. Compared with tripterine, the tripterine acrylamide derivative disclosed by the invention has the advantage that the inhibition effect of the tripterine acrylamide derivative on tumor cells is obviously enhanced. The invention also discloses an application of the tripterine acrylamide derivative in preparation of antitumor drugs. # imgabs1 #

The invention discloses a small bamboo shoot hob block processing device which comprises a base frame, a power system is installed below the base frame, and the power system is composed of a main air cylinder, an auxiliary air cylinder, a driving motor and a rotating motor and mainly controls automatic feeding and cutting of materials. The main air cylinder is connected with the telescopic column, and the detachable blade is connected to the telescopic column and can be adjusted to be at different angles. And the driving motor is connected with the roller to control the rotating angle of the small bamboo shoots so as to facilitate daily use. According to the small bamboo shoot hobbing cutter block processing equipment, bamboo shoots can be continuously cut into equal hobbing cutter blocks through electromechanical transmission, the labor intensity and the labor cost are reduced, and the working efficiency is greatly improved.

The utility model relates to the technical field of waste gas purification equipment, and discloses waste gas purification environment-friendly equipment which comprises a pneumatic cyclone tower, the pneumatic cyclone tower comprises a filtering box body and a cyclone tank body, the cyclone tank body is connected to the upper side wall surface of the filtering box body in a sealed mode, and a spraying pipe, a cyclone mechanism and a blow-off pipe are arranged in the cyclone tank body. And an air inlet mechanism is arranged on the outer wall of the cyclone tank body. Waste gas is discharged into the cyclone tank body through the gas inlet mechanism, the waste gas can be separated through the spraying pipe and the cyclone mechanism, water liquid with waste particles can fall into the filtering tank body through the blow-off pipe and fall onto the outer wall of the upper side of the filtering conveying belt, and clean water liquid can pass through the filtering through groove and is discharged into the filtering tank body. And when particles need to be discharged, a driving motor can be started, a front side transmission rotating roller starts to rotate, the filtering conveying belt starts to rotate under the cooperation of a rear side transmission rotating roller, and the particles can be discharged through a discharging through groove.

The invention provides a synthesis method of 1-amino-2-cyano-1-cyclopentene, which comprises the following steps: 1, mixing an ionic liquid and a super-strong organic alkali in a protective gas atmosphere, heating, stirring, uniformly mixing and dissolving to obtain a material A; the ionic liquid is selected from at least one of [BMIM] PF6, [BMIM] BF4, [BMIM] NTf2, [BMIM] OTf and [BMIM] OAc; 2, adiponitrile is dropwise added into the material A under stirring for a reaction, and a material B rich in 1-amino-2-cyano-1-cyclopentene is obtained; 3, cooling and crystallizing the material B, and carrying out pressure filtration to obtain an ACCP crude product; and 4, recrystallizing and refining the obtained ACCP crude product to obtain a pure product. The method provided by the invention has the advantages of simplicity, high efficiency, sustainable production, low cost, low content of generated three wastes, mild reaction conditions and suitability for industrial production.

This invention relates to the field of cable laying technology, specifically to a convenient cable laying device for building electromechanical installation, comprising a bracket, a fixed pulley, and a cable, as well as a locking device and a cable management wheel. The fixed pulley is rotatably mounted on the upper front surface of the bracket. A vertically arranged groove is provided on the front front surface of the bracket below the fixed pulley. A slider is fixedly mounted on the rear end of the cable management wheel, and the slider is slidably mounted in the groove. A locking device is installed on the edge of the bracket on one side of the fixed pulley. One end of the cable passes through the fixed pulley and then through the locking device, which locks the cable in place. The other end of the cable passes around the cable management wheel, which is equipped with a tightening device for securing the cable. This invention achieves cable organization and adjustment by using the fixed pulley and cable management wheel. The locking and tightening devices secure the cable to prevent slippage, avoiding sagging at overhead locations, improving laying efficiency, and facilitating subsequent processing.

The invention discloses a Cordyceps militaris mycelium fermentation product and a preparation method and application thereof, and belongs to the technical field of daily cosmetics. A preparation method of a Cordyceps militaris mycelium fermentation product comprises the following steps: using Cordyceps militaris mycelium as a strain, accessing the strain into a liquid culture medium for expansion culture, and obtaining a seed solution; transferring the seed solution to a fermentation tank containing a liquid culture medium, passing oxygen and stirring, and fermenting for a certain period of time to obtain a fermentation liquid; adding an industrial complex enzyme to the fermentation liquid, heating and stirring to obtain an enzymolysis treatment liquid; adding a certain amount of alcohol solution to the enzymolysis treatment liquid, fully mixing, and obtaining an alcohol precipitation liquid; separating the alcohol precipitation liquid, filtering the supernatant, collecting the clarified filtrate, and obtaining a Cordyceps militaris mycelium fermentation product. The present invention adopts a specific complex enzyme that is inexpensive and suitable for industrialization, fully releases the active substances of Cordyceps militaris, and improves the efficacy of the product in cosmetics.

The invention relates to a method for assisting 3D printing based on a solid support bath and a product. The method comprises the following steps: preparing silicone elastomer ink; filling the silicone elastomer ink into a printing needle cylinder, and printing in a container containing a solid matrix with a certain particle size or repose angle according to a set printing requirement; after printing is completed, the whole container is heated for a certain time; and taking out the semi-cured printing piece, and continuously heating to obtain a completely-cured printing component. According to the method, the selection range of printing ink is expanded, printing can be conducted in solid particles or matrixes with different particle sizes or repose angles, and by adjusting printing parameters, a complex three-dimensional structure can be obtained through printing by adopting simple printing equipment only under the supporting effect of the solid particle matrixes; and a printing component can be obtained through simple post-treatment.

The invention discloses a synthesis method of a trifluoromethanesulfonate radical promoted amidino nickel complex. The preparation method comprises the following steps: reacting N, N '-dialkyl substituted amidino alkali metal salt with a nickel precursor, adding trifluoromethanesulfonate as an accelerant, and regulating the reaction rate and selectivity by utilizing the coordination effect of trifluoromethanesulfonate so as to efficiently prepare the amidino nickel complex. In the process, an ether compound is used as a solvent, the reaction is carried out at 0-70 DEG C for 1-48 hours, the reaction yield can reach 90% at most, and the product purity is gt; and 98%. The method has the characteristics of easily available raw materials, simplicity and convenience in operation, mild reaction conditions, good target product selectivity, high synthesis efficiency, convenience in post-treatment and the like, and has industrial application prospects.

The utility model discloses an automatic pad printing machine which comprises a fixed bottom plate, a lifting shell extending vertically is fixed to the top face of the rear portion of the fixed bottom plate, a vertical lifting mechanism is installed in the lifting shell, an extending block is fixed to the front portion of a lifting block of the vertical lifting mechanism, and a lifting air cylinder is installed on the top face of the extending block. A lifting connecting column is fixed to the bottom end of a push rod of the lifting air cylinder, a lifting plate is fixed to the bottom face of the lifting connecting column, and a cylindrical pad printing block extending front and back is installed in the middle of the bottom face of the lifting plate. The outer wall surface of a cylinder or a cone can be subjected to pad printing, the pad printing effect is good, and the efficiency is high.

This invention discloses a method for synthesizing an intermediate of retinoic acid, relating to the field of pharmaceutical organic synthesis technology, comprising the following steps: S1, in the presence of a base, 2-amino-3-chloropyridine and 4-bromopiperidine undergo a nucleophilic substitution reaction in solvent A to prepare compound III; S2, in the presence of a catalyst and ammonia solution, compound III undergoes an amination reaction in solvent B to prepare compound II; S3, compound II is dissolved in solvent C, and sequentially undergoes CDI cyclization and hydrogen chloride solution salt formation to prepare compound I, namely 1-(piperidin-4-yl)-1,3-dihydro-2H-imidazo[4,5-b]pyridin-2-one. This invention is low-cost, uses mild reaction conditions, has a simple synthesis process, high yield, and eliminates the need for expensive and potentially unsafe excipients, effectively improving reaction safety, being environmentally friendly, and suitable for industrial production.

The application discloses a new preparation method of an intermediate of imatinib, and relates to the technical fields of medicines and chemical industry. The intermediate of imatinib, i.e. a-amino-2-methoxy-4-methanesulfonamido-5-phenoxyphenylacetophenone, is synthesized by taking 3-methanesulfonamido-4-phenoxyanisole and chloroacetyl chloride as raw materials, perfluoro-tert-butyl alcohol as a solvent, and D72 strong-acid macroporous resin as a catalyst, and then reacting with ammonia after a-chloro-2-methoxy-4-methanesulfonamido-5-phenoxyphenylacetophenone is synthesized. The application greatly improves the yield and purity, overcomes the shortcomings of the prior art in safety production, environmental protection and clean production, has a simple route, high reaction safety, convenient post-treatment, and effectively reduces the production cost, and is suitable for large-scale production.

The present application relates to automatic winding technical field, especially in kind of automatic winding machine, winding method and stator, it includes; base, winding mechanism and hooking mechanism, winding mechanism activity sets up on base, winding mechanism contains placement tool and winding disc, the outer diameter of winding disc is greater than the outer diameter of placement tool, hooking mechanism activity sets up on base, and is located in winding mechanism one side, hooking mechanism can extend into winding mechanism;By this, through increasing the diameter of winding disc, the distance of winding column to stator core in placement tool is extended, the number of winding turns of lead-out wire on winding disc is reduced, the lead-out wire on winding disc tends to be regular, so that the technical effect of facilitating subsequent operation is achieved;At the same time, cooperate with hooking mechanism, can independently select same side winding method or different side winding method, not only reduces the production cost, and improves production efficiency.

The application discloses a synthesis method and application of an indole alkaloid derivative. The method uses 5-aminoindole or 6-aminoindole as a substrate, reacts with acyl chloride or carboxylic acid to obtain an intermediate, and then reacts with Hydroxyclavatol to obtain a Penindolone (PND) derivative of the application. The method has the advantages of easy availability of raw materials, short reaction time, few steps involved, simple post-treatment and the like. The indole alkaloid PND derivative prepared by the method has good anti-influenza virus activity and wide application prospect.

This invention provides an ionic liquid flame retardant, an epoxy resin composite material, its preparation method, and its application. The preparation method of the ionic liquid flame retardant includes the following steps: S1. Adding a solvent, an acid-binding agent, and pentaerythritol phosphate to a reaction vessel, then adding an alkyl sulfonyl chloride compound dropwise for reaction. After the reaction, the mixture is separated and purified to obtain the intermediate PEPA-Ps; S2. Dissolving the intermediate PEPA-Ps with an amino-containing heterocyclic compound in an organic solvent and reacting. After the reaction, the mixture is separated and purified to obtain the ionic liquid flame retardant. This invention introduces amino, sulfonyl chloride, and pentaerythritol phosphate groups into an ionic liquid to construct a phosphorus-nitrogen-sulfur ternary synergistic flame retardant system. The obtained amino-containing ionic liquid flame retardant can participate in the curing reaction of epoxy resin, significantly improving the flame retardant performance of epoxy resin composite materials while effectively improving their tensile, flexural, and impact strength and other mechanical properties.

The invention relates to a compound containing double isatoic anhydride functional groups, a polymer with pH and temperature dual stimulation response as well as a preparation method and application of the polymer. The compound containing the bis-isatoic anhydride functional group has a structure as shown in a formula (1). The pH and temperature dual-stimulus-responsive polymer is obtained by carrying out polymerization reaction on the compound containing the double isatoic anhydride functional group and oligomeric ethylene glycol diamine. The aqueous solution of the polymer has pH and temperature dual stimulation response and has LCST type phase transition characteristics, the amino group on the main chain of the polymer makes the polymer show positive electricity in the aqueous solution, the polymer can be conjugated with electronegative siRNA through electrostatic interaction, and the polymer can be used for loading siRNA and delivering siRNA drugs, and can be used for preparing siRNA drugs. Therefore, the method has potential application value in the fields of intelligent response materials and medical biology. # imgabs0 #

The utility model provides a kind of high concentration metal wastewater treatment system, comprising: wastewater pool, for storing high concentration metal wastewater;Adjustment pool, water is communicated between the wastewater pool by pipeline, for the PH value adjustment of high concentration metal wastewater, forms acidic first intermediate wastewater;Micro electrolytic cell, water is communicated between the adjustment pool by pipeline, for the micro electrolysis of first intermediate wastewater, forms second intermediate wastewater;Chemical oxidation pool, water is communicated with the micro electrolytic cell by pipeline, for the oxidation decomposition of second intermediate wastewater, forms third intermediate wastewater;Sedimentation tank, water is communicated between the chemical oxidation pool by pipeline, for the sedimentation treatment of third intermediate wastewater, forms fourth intermediate wastewater;Chlorination tank, water is communicated with the sedimentation tank by pipeline, for the fold point chlorination treatment of fourth intermediate wastewater;Clean water pool, for the storage of clean water after processing is completed.The high concentration metal wastewater treatment system in the scheme can effectively treat high concentration metal wastewater.

The invention provides a method for preparing dimethyl curcumin, comprising steps: 1) acetylacetone and boron oxide react in isopropyl acetate to obtain acetylacetone boron complex; 2) acetylacetone boron complex, veracrucal and tributyl borate react in dimethylacetamide or N-methylpyrrolidone in the presence of an organic base catalyst, after the reaction is terminated, the reaction is quenched with aqueous hydrochloric acid solution, then water is added for crystallization, and dimethyl curcumin is obtained; wherein the molar ratio of hydrochloric acid to organic weak base is (1-2): 1; the amount of water added is 1-3 times of the volume of the reaction solution. The method of the present invention is simple to operate, short in reaction time, convenient for post-processing, high in product yield and purity, environmentally friendly, and suitable for industrialized large-scale production.