332results about How to "Improve reaction efficiency" patented technology

The invention provides a polyaspartic acid complex for a scale inhibitor, which is characterized by being prepared by the following steps of: 1) reacting maleic anhydride, an ammonia-containing substance and water in a mass ratio of 1:((1-1.5):(1.2-2.0) under normal pressure at the temperature of between 50 and 80DEG C for 1 to 2 hours to synthesize maleic acid ammonia; 2) performing polymerization reaction on the maleic acid ammonia at the temperature of between 160 and 200DEG C under normal pressure to generate polysuccinimide; and 3) hydrolyzing the polysuccinimide at the pH of 10-12 and the temperature of between 25 and 50DEG C to generate the polyaspartic acid salt. The polyaspartic acid complex for the scale inhibitor has better scale inhibiting effect on various scaling components such as CaCO3, CaSO4, BaSO4 and SrSO4 in a water treatment system; and through scale inhibition rate testing experiments, the scale inhibition rate is not less than 40 percent, and the polyaspartic acid complex can be widely applied to various water treatment processes, such as a circulating cooling water system, a boiler feed water system, an oil-water water injection system and a seawater desalting system.

The invention discloses a polyhydroxy polybutadiene liquid rubber and a controllable preparation method thereof. According to the method, the polyhydroxy polybutadiene liquid rubber is prepared by carrying out oxidative pyrolysis and a reduction-process on commercialized cis-1,4-polybutadiene rubber. The number-average molecular weight of the polyhydroxy polybutadiene liquid rubber prepared from the cis-1,4-polybutadiene rubber is adjustable within the range of 1000-15000 g/mol; the molecular weight distribution is 1.2-3.0; the cis-1,4 content is greater than 90%; the glass transition temperature is -100 to -80 DEG C; the hydroxy functionality is 5-30; and the hydroxy groups are distributed on the head and tail ends of the polybutadiene molecular chain and in the molecular chain. Under the background of overstocked unvulcanized cis-1,4-polybutadiene rubber and increasingly deficient petroleum resources, the polyhydroxy polybutadiene liquid rubber prepared by cis-1,4-polybutadiene rubber oxidative pyrolysis has very important practical meanings.

The present invention presents a mixture comprising charge-stabilized metallic nanoparticles and a photosensitizer, a method for making such mixture, and a method of using such mixture for killing or preventing the growth of microbes.

A process for preparing acetonyloxime or butanonyloxime by oxidizing acetone or butanone includes dissolving acetone or butanone is isopropanol or tert-butanol, adding catalyst TS-1 and ammonia, and slowly dripping hydrogen peroxide while reaction for 0.25-12 hr. Its advantages are high conversion rate and high selectivity.

The invention provides a method for oriented biosynthesis of GAMG, and belongs to the technical fields of biosynthesis and biotransformation. The method comprises the following steps: producing corresponding beta-D-glucuronidase by penicillium purpurogenum stoll in a fermentation medium; adding the obtained beta-D-glucuronidase into conversion solution containing glycyrrhizic acid substrate, orientedly hydrolyzing the glycyrrhizic acid under the action of enzyme, and obtaining a coarse product of GAMG; and performing organic solvent extraction, resin adsorption and purification to obtain a GAMG product. The method takes microbialenzyme as a catalyst, and has high reaction efficiency, no pollution, simple steps, and low cost; and the product is single and has high purity.

The invention relates to an enzymatic process to prepare the diglyceride from an organic medium system, belonging to the vegetable oil synthesis field, which is characterized in that a short chain alcohol and lipid with the molar ratio of the alcohol ester being 0.5:1 to 2:1, an organic solvent taking over 20% to 300% of lipid volume, and an immobilization lipase with dry weight taking over 0.5% to 20% of the lipid mass are filled into a conical flask with a plug and are stirred evenly, the conical flask positioned in an automatic temperature controlled reciprocating shaker is heated up to 20 to 60 degree centigrade and reacted for 1 to 48 hours, then the oil material is transformed into the diglyceride and two secondary products the monoglyceride and the fatty acid short chain alcohol ester; the products are distilled to remove the organic solvent, the diglyceride is made after the reduced pressure distillation and the molecular distillation, and meanwhile the secondary product fatty acid short alcohol ester is produced. The enzymatic process to prepare the diglyceride from an organic medium system has the advantages of perfectly solving the problem of big viscosity of the reaction substrate during the process of producing diglyceride by means of the biological enzyme, effectively lowering the negative influence of the short chain alcohol on the enzyme reactivity, and significantly increasing the reaction efficiency.

The invention discloses a titanium-silicon molecular sieve and resin composite catalyst and a preparation method thereof. The catalyst mainly comprises a titanium-silicon molecular sieve and resin. The preparation method comprises the following steps of: fully mixing titanium-silicon molecular sieve powder, a polymeric monomer and a porogen, performing polymerization reaction in the presence of an initiator to obtain a blocky solid catalyst, crushing, adding into halogenated hydrocarbon for swelling, and performing solvent extraction to obtain a formed catalyst. The catalyst prepared by the method solves the problem that titanium-silicon catalyst powder and reaction liquid are difficult to separate, improves reaction efficiency, is applied to the catalytic reaction process of olefin epoxidation in a fixed bed process, and has good catalytic effect.

A chemical reaction device is provided for a chemical reaction between molecules immobilized on a solid phase and molecules in a solution, and a chemical analysis device is also provided to capture molecules in the solution by molecules immobilized on the solid phase through a chemical reaction and subsequent measurement of the captured molecules. Reaction efficiency as well as sample throughput are thereby improved. The chemical reaction device and the chemical analysis device use a channel of a microfluidic device for a reaction vessel, and at least a particular molecule is immobilized on an interior surface and a fixed structure or a non-fixed obstacle against a flow is provided in the channel. In a typical reaction vessel having an enzyme immobilized on an interior surface of a capillary and glass beads functioning as an obstacle for the flow filled in the channel of the capillary, a reaction solution can move either in one direction or back and forth in two directions to thereby undergo a reaction with the enzyme immobilized on the interior surface. The flow of the reaction solution is not a laminar flow so that a reaction between the particular molecule immobilized and the reaction solution proceeds at high efficiency.

The invention relates to preparation and an application of a high-activity noble metal oxide catalyst. Active components of the catalyst comprise oxides of noble metals Ru, Ir and Rh, and a carrier is TiO2 or TiO2 modified SiO2, Al2O3, SnO2 cheap oxides. Through adjusting and changing the composition of different crystal forms of TiO2, strong interaction of the active noble metal oxides and TiO2 is improved, the dispersion degree of the noble metal oxides is significantly improved, and thus high-dispersion noble metal oxide catalyst with TiO2 or the TiO2 modified cheap oxides as the carrier is obtained. The method has the advantages of simple and easy implementation, convenient industrial production, extremely good repeatability and the like; prepared noble metal oxide particles are smaller in particle diameter and uniform in size. The catalyst has lower initial reaction temperature and high reaction stability in an N2O decomposition reaction, and has a good application prospect.

The invention discloses a method for continuously preparing azo dye in micro-reactors in the field of dye synthesis. The azo dye is prepared by firstly subjecting a sodium nitrite solution, an aromatic primary amine and an inorganic acid to a diazotization reaction at room temperature in a first micro-reactor to generate an aromatic primary amine diazonium salt; and then subjecting the aromatic primary amine diazonium salt and a coupling component to a coupling reaction in a second micro-reactor to generate the azo dye. Continuous preparation of the azo dye is achieved by utilizing the micro-reactors, a process is simple, a reaction period is short, and a reaction process can be easily monitored and controlled. Addition of an excessive amount of the sodium nitrite and the coupling agent to increase the reaction speed is not required so that raw materials are saved and the method is environmentally friendly. Reaction liquid in the micro-reactors achieves high-speed collision mixing, a uniform reaction environment is formed immediately, the reaction efficiency is high, and the yield and quality of a reaction product are greatly improved.

The invention relates to a method for preparing nitroguanidine through a micro-channel reactor, belonging to the technical field of organic synthesis applications. The method is a new process for synthesizing nitroguanidine by taking a water solution of guanidine nitrate and concentrated sulfuric acid as raw materials and performing acid dehydration in the Corning micro-channel reactor within a short reaction time from tens of seconds to a few minutes. Materials are introduced into the Corning micro-channel reactor through a metering pump, a nitroguanidine product is obtained by preheating, mixing, reaction and post-treatment, and the method has the advantages of simplicity, convenience and safety in operation, high yield and continuous production of the nitroguanidine product; and in addition, by adopting the process, the environmental pollution can be greatly reduced. The yield of the product according to the method disclosed by the invention is 80-85%, and the melting point of the product is 230-232 DEG C.

The invention belongs to the technical field of organic synthesis, and in particular relates to a method for synthesizing paraphthaloyl chloride through continuous flow in a micro-channel reactor by taking phthalic acid and phosgene/triphosgene as raw materials. The invention aims to provide a micro-channel continuous flow reaction manner for performing terephthalic acid chlorination so as to synthesize paraphthaloyl chloride. Compared with the existing process, the process disclosed by the invention has the characteristics of being accurate in control of reaction conditions, high in phosgene/triphosgene utilization rate, low in catalyst usage, high in TPA (terephthalic acid) conversion ratio with reaction time of decades of seconds, high in TPC yield and the like.

The invention discloses high cis-1,4 content epoxy hydroxyl-terminated polybutadiene liquid rubber and a preparation method thereof. The method comprises the following steps: (1) preparing epoxy butadiene rubber from butadiene rubber; (2) preparing high cis-1,4 content epoxy aldehyde-terminated polybutadiene liquid rubber; (3) preparing high cis-1,4 content epoxy aldehyde-terminated polybutadiene liquid rubber by using a one-pot method; and (4) performing reduction preparation, thereby obtaining high cis-1,4 content epoxy hydroxyl-terminated polybutadiene liquid rubber. According to the preparation method, the high cis-1,4 content epoxy hydroxyl-terminated polybutadiene liquid rubber is prepared from butadiene rubber, the content of cis-1,4 can be up to 70.0-98.0%, the epoxy rate can be within 1-30%, the number-average molecular weight can be within 2000-13000g/mol, the molecular weight distribution is within 1.2-3.0, and the functionality degree is within 1.9-2.2. Under the background that the butadiene rubber supply is beyond the requirements and the petroleum resources are short day by day, the preparation of high cis-1,4 content epoxy hydroxyl-terminated polybutadiene liquid rubber from butadiene rubber by using an oxidation cracking method has very significant practical meanings.

The invention provides a method for preparing a steady phase-A vanadium dioxide nanorod. The method includes directly adding aqueous solution containing tetravalent vanadium ions into a hydrothermal kettle for hydrothermal reaction, and enabling the filling ratio of the hydrothermal kettle in the hydrothermal reaction process to range from 50% to 90%; heating and controlling the hydrothermal reaction temperature to range from 180 DEG C to 220 DEG C and keeping the hydrothermal reaction temperature for 0-720 hours; and cooling, centrifuging, washing and drying a compound obtained by hydrothermal reaction to prepare the steady phase-A vanadium dioxide nanorod with the length-diameter ratio ranging from 1:1 to 1000:1. The method has the advantages that special equipment is omitted, operation is simple and convenient, and yield is high.

A disclosed preparation method for cassava starch modified by combining three kinds of modification processes is characterized by comprising: taking starch as a raw material, employing a wet-process crosslinking-oxidation-esterification chemical modification technological route, specifically, performing a crosslinking reaction and an oxidation reaction on an active starch slurry at the same time, then adding a pretreated composite esterification reagent to perform esterification reaction, and adjusting the pH value of the starch slurry to 5.0-6.5, so as to finish combined modification of cassava starch, filtering to obtain wet starch with the water content of 35% or less, then adding polyethylene glycol, mixing uniformly, and performing drying, cooling, crushing and sieving, so as to obtain the cassava starch modified by combining three kinds of modification processes. Only one time of post-processing process comprising washing, centrifugation, drying and the like is performed, the technological process is continuous and automatic, energy and reaction time are saved; and the product is low in gelatinization temperature, good in formability, improved in permeability, caking property, film forming ability and anti-ageing property, and is suitable for being used as a coating adhesive and a surface sizing agent in papermaking industry, a sizing agent in weaving industry, an industrial binder and the like.

The invention discloses a selfheal polysaccharide zinc chelate as well as a preparation method and application thereof to an anti-cancer drug. The method comprises the following steps: crushing selfheal clusters, decolorizing by use of ethanol, adding distilled water, performing reflux extraction, deproteinizing the extracting solution, performing ultrafiltration, and freeze-drying the retained liquid to obtain polysaccharide; preparing a polysaccharide solution of which the concentration is 10 mg/mL to 40 mg/mL, heating to the temperature of 40-60 DEG C, regulating pH by using sodium hydroxide, slowly adding a zinc salt solution into the polysaccharide solution, reacting for 6-24 hours, simultaneously performing an discontinuous homogenization process by using a high-shear homogenizer, regulating the pH by using hydrochloric acid, centrifuging to obtain supernatant liquor, putting the supernatant liquor into a dialysis bag for dialysis, collecting the solution in the dialysis bag, and performing freeze-drying to obtain the selfheal polysaccharide zinc chelate. The product disclosed by the invention is simple and easy to implement in preparation method, has a remarkable anti-proliferation effect on human cancer cells and also causes no cytotoxicity to normal cells of the human body, so the selfheal polysaccharide zinc chelate is an ideal anti-cancer drug or a health care product and also has a zinc replenishment effect.

The invention discloses a method for preparing a titanium silicon molecular sieve catalyst. The method comprises the following steps of: mixing titanium silicon molecular sieve powder, polymer monomer styrene, a polymer monomer multi-alkenyl compound and a pore-forming agent completely; in the presence of an initiator, performing a polymerization reaction; smashing the obtained blocky solid catalyst; adding the smashed catalyst into halohydrocarbon to swell; and performing extraction by using a solvent to obtain the formed titanium silicon molecular sieve catalyst. The titanium silicon molecular sieve catalyst prepared by the method solves the problem that the titanium silicon catalyst powder and reaction solution are difficult to separate and improves the reaction efficiency. The titanium silicon molecular sieve catalyst is applied to a catalytic reaction of alkene epoxidation of a fixed bed process and has excellent catalytic effect.

The invention discloses application of a beta-diimine divalent rare earth boron hydrogen complex to hydroboration of catalytic aldehyde and borane. The beta-diimine rare earth dichloride and NaBH4 react in a tetrahydrofuran solvent and then in-situ Na/K is utilized to reduce, so that the beta-diimine divalent rare earth boron hydrogen complex: [2,6-ipr2-(C6H3)-NC(Me)CHC(Me)N-(C6H3)-2,6-ipr2]Ln-BH4.2THF is acquired. The beta-diimine divalent rare earth boron hydrogen complex disclosed by the invention can high-actively catalyze the hydroboration of borane and aldehyde under a mild condition; the reaction time is short; the reaction condition is mild; the post-processing method is simple and convenient.

The invention relates to a chemical reaction method, which mainly solves the technical problems of low selectivity on target products and high content of side reaction products in the prior art. In the invention, the problems are favorably solved by adoption the technical scheme that: the chemical reaction is carried out in an overweight force field without the presence of catalysts or the chemical reaction is carried out in the overweight force field in the presence of the catalysts. The chemical reaction method is applicable to the industrial production of chemical reaction.

The invention discloses a horizontal multi-helix biomass continuous hydrolysis and saccharification device and a method. The device comprises a raw material storage and delivery system for storing and continuously delivering reaction raw materials, the output end of the raw material storage and delivery system is connected with a main body reaction section for fully stirring and compressing solid and liquid reaction raw materials, the input end of the raw material storage and delivery system is connected with a heat supply system for adjusting the reaction temperature, and the output end of the main body reaction section is connected with a reaction post-treatment system for separating the solid material and the liquid material. The device of the invention is really used for continuous hydrolysis and saccharification, can continuously add the materials and discharge the hydrolyzed residues, effectively improves the production efficiency, really realizes continuity of hydrolysis reaction, and lays a foundation for large-scale industrialized production.

The invention discloses a method for preparing bromo-2-methylpropane through bromination of tertiary butanol in a continuous flow micro-channel reactor, belonging to the technical field of organic synthesis application. The method is a new process in which the tertiary butanol and hydrobromic acid are used as raw materials and concentrated sulfuric acid is used as a catalyst to synthesize the bromo-2-methylpropane in the reaction time of scores of seconds to several minutes in the continuous flow micro-channel reactor. Three steams of materials are led into the continuous flow micro-channel reactor through a metering pump and are preheated, mixed and reacted to finally obtain a bromination product, i.e., the bromo-2-methylpropane. The method is easy and convenient to operate, so that high-yield continuous production of the bromo-2-methylpropane becomes possible, and the process has low environment pollution. The conversion rate of the tertiary butanol reaches 78-95 percent, and the selectivity of the bromo-2-methylpropane reaches 92-97 percent.

The invention relates to a method for preparing (S)-N-t-butyloxycarboryl-3-hydroxypiperidine through carbonyl reductase biocatalysis. According to the method, reaction conditions are moderate, conversion efficiency is high, stereoselectivity is high, and the product ee value is 99.5% or above. The concentration of a substrate can be increased to 250 g/L, the space time yield can be as high as 1600 g/L/d, production efficiency is greatly improved, and the method has important industrial application value.

The invention relates to a high efficiency clean production method for oxidized starch. The technical problem to be solved by the invention is to carry out the production of the oxidized starch under the conditions of continuous fluidization without waste discharge, shorten the reaction time and reduce the energy consumption. The preparation method comprises: premixing and activating an oxidant and an activating catalyst in advance; and continuously metering and mixing the premixed and activated oxidant and the activating catalyst and the crude starch at a high speed, continuously inputting the mixed material into a pipeline reactor with a packing auger, and carrying out the pipeline reaction at 20 to 80 DEG C for 20 to 100 minutes so as to continuously obtain the oxidized starch crude product. The water content in the reaction system is 12 to 35 percent.

The present invention discloses a SCR system automatic control method based on ammonia spraying sensitive valve locking. The method comprises three steps: firstly, performing comprehensive analysis of varying load condition operation characteristics of the SCR system based on a field test and a CFD numerical simulation technology to obtain flue gas 'NOx flow' regional continuous distribution characteristics matching an AIG type; then determining the weight of each ammonia spraying branch pipe valve, locking a certain number of sensitive valves according to a preset sensitive valve locking principle, and installing an automatic regulating valve at a corresponding ammonia spraying region; finally, developing an ammonia spraying logic controller and corresponding main control and sub-control logics, realizing multistage optimization setting of parameters of the control system, and realizing the accurate automatic control of the main ammonia spraying regulating valve of the SCR system and the locking sensitive valves. The SCR system automatic control method based on ammonia spraying sensitive valve locking is able to overcome the problems of characteristics of the SCR system such as nonlinearity, large delay and the like so as to realize the accurate automatic control of the ammonia spraying of the SCR system, substantially enhance the SCR denitration reaction efficiency, save the dosage of ammonia, reduce the ammonia escape and effectively inhibit the generation of ABS.

Belonging to the technical field of organic synthesis, the invention relates to a method for preparing p-aminodiphenylamine with aniline and nitrobenzene. The method comprises the steps of: adding a phase transfer catalyst and inorganic base in the form of solid into a reaction system, subjecting nitrobenzene and aniline to a condensation reaction for 2-24h at a temperature of 60-150DEG C so as to generate 4-nitrodiphenylamine and 4-nitrosodiphenylamine of high selectivity, then subjecting the 4-nitrodiphenylamine and 4-nitrosodiphenylamine to hydrogenation with the presence of a Pd/C catalyst, thus obtaining p-aminodiphenylamine. The Pd/C catalyst is prepared in the processes of: pretreating the activated carbon carrier by acid treatment and oxidation treatment; adding a rare earth metal into the active component palladium (Pd); employing an immersion adsorption technology; adjusting the pH with a sodium hydroxide solution and maintaining the pH at 6-8 for reduction and washing, and drying, thus obtaining the finished product of catalyst. With the method provided in the invention, high purity RT base can be prepared.

The invention discloses a method for extracting manganese from composite manganese ore composed of multiple phases containing manganese. The method provides a new technology for processing novel manganese resources. The method includes the specific steps that the composite manganese ore is smashed and ground, and composite manganese concentrate is obtained through a magnetic separation method; then the composite manganese concentrate is placed in a roasting device, roasting temperature ranges from 200 DEG C to 600 DEG C, roasting time ranges from 1h to 4h, an obtained roasted product is leached through sulfuric acid, the weight ratio of added sulfuric acid to the roasted product is 2-10 to 1, leaching temperature ranges from 30 DEG C to 100 DEG C, leaching time is 30-240 min, filtering is carried out, the leached liquid is deironized, then sodium fluoride is added to remove calcium and magnesium, then co-precipitation is carried out for further impurity removal, the obtained filtered liquid is conveyed into an electrolytic cell to be electrolyzed, and an electrolytic metal manganese product is obtained. The method has the advantages of being high in reaction efficiency, high in speed, capable of reducing energy consumption and saving resources, high in product recovery rate and environmentally friendly.

The invention provides a preparation method for an aromatic nitrile compound. The method comprises steps as follows: catalyzing the toluene or toluene derivative with a substituent or methyl substituted aromatic ring by a free radical initiating agent and a divalent palladium for reaction with an oxidizing nitrogen source in an organic solution to generate the substituent-reserved aromatic nitrile compound. According to the preparation method, the substrate related is simple and compatibility to various functional groups is realized, the method is relatively good in universality and can be conducted under highly mild environment; the application of toxic CN negative ion reagents is effectively avoided, and the problem of excessive waste and use of metal under the conventional condition is solved; the method is high in reaction rate, low in reaction cost and simple in post-reaction treatment, and the products can be easily purified, therefore the method can be widely used for preparation of various aromatic nitrile compounds.

The invention discloses a technology for preparing vitamin D3. The technology comprises the following steps of: (1) preparing a 1wt%-3wt% 7-dehydrocholesterol solution, and passing the 7-dehydrocholesterol solution through a photochemical reactor filled with nitrogen for carrying out photochemical reaction, wherein the reaction temperature is controlled within the range of 35-50 DEG C and the conversion rate is controlled within the range of 10-20%; collecting a photochemical reaction liquid, recovering 70-80% of solvent, centrifuging and recovering the 7-dehydrocholesterol, and crystallizing and filtering filtrate, and recovering the solvent from the filtrate to obtain vitamin P3 mixture; (2) dissolving the vitamin P3 mixture into an adsorption solvent, and carrying out column chromatography separation to obtain vitamin P3 component; and (3) carrying out thermal isomerization reaction on the vitamin P3 component, basically converting the vitamin P3 into the vitamin D3, then freezing and crystallizing to obtain the vitamin D3 crystal. The technology is simple in technical process, large in handling capacity, low in toxicity and environmental pollution and high in yield, thus the technology is used for preparing the vitamin D3 pure product which is in accordance with the requirements of pharmacopeia.

The invention discloses kieselguhr-based ferric carbon ceramsite packing. The kieselguhr-based ferric carbon ceramsite packing consists of scrap iron, activated carbon powder, kieselguhr, ammonium sulfate and a starch solution. The invention further particularly discloses a preparation method of ceramsite packing. The preparation method comprises the following steps: uniformly mixing the scrap iron, the activated carbon powder, the kieselguhr, ammonium sulfate and the starch solution; pressing the mixture into a mud cake; and then pelleting and firing to obtain the final product. The kieselguhr is used as the base material of the scrap iron and the activated carbon powder, after pelleting, the kieselguhr, the scrap iron and the activated carbon powder are fused integrally by high-temperature firing, under the effects of starch as an enhancer and ammonium sulfate as a pore-forming agent, spherical ceramsite which is high in strength and has a plurality of pores inside is formed, the problems of adhesion of the scrap iron and uneven distribution of iron and carbon are solved, the shortcoming of hardening and passivation of traditional iron and carbon micro-electrolysis packing can be overcome, micro-electrolysis reaction efficiency is improved, furthermore, operation of packing supplementing can be simplified, and labor intensity is reduced.

The invention relates to a preparation method of doxylamine succinate. The preparation method comprises the steps as follows: firstly, a Grignard reagent generated by iodobenzene and magnesium reacts with 2-acetylpyridine to generate 2-pyridyl phenyl methyl alcohol, the 2-pyridyl phenyl methyl alcohol is recrystallized to be purified, then the 2-pyridyl phenyl methyl alcohol reacts with sodium amide and 2-dimethylamino chloroethane sequentially, doxylamine is obtained and has a salt forming reaction with succinic acid finally, and the doxylamine succinate is obtained. The preparation method is high in reaction efficiency, lower in cost and applicable to industrial mass production.