2011 results about "Fine chemical" patented technology

The invention relates to the technical field of automation, in particular to an automatic monitoring and optimizing system for a fine chemical production process, which comprises the following steps of: extracting time-frequency domain fusion characteristic quantity of stirring torque power time sequence fluctuation data in real time through an incidence matrix construction module, dynamically inverting a thixotropic index by combining a deep neural network model, and optimizing the stirring torque power time sequence fluctuation data; the problem that a traditional method is difficult to perceive material rheological characteristics in real time is solved. The dynamic coupling analysis module analyzes the material viscosity change rate based on the thixotropic index, fuzzy PID control is adopted to generate a stirring speed adjusting instruction dynamically matched with the viscosity and a jacket temperature compensation value, and the defects of uneven mixing and local overheating caused by lagging adjustment of process parameters are overcome; the multi-target collaborative optimization module locks the mass optimization weight in the viscosity sudden change stage, rapidly stabilizes the reaction condition through a feed-forward compensation algorithm, dynamically balances the stirring power consumption and the heat transfer efficiency based on Pareto frontier search in the steady state stage, and solves the conflict between the mass and the energy efficiency target.

The invention relates to the technical field of reaction kettle temperature control, and discloses a fine chemical engineering reaction kettle temperature intelligent control method based on self-adaptive search, which comprises the following steps: S1, data acquisition: acquiring operation data of a reaction kettle, including temperature in the kettle, jacket inlet and outlet temperature, fluid flow and valve opening signals; s2, heat balance calculation: establishing a heat balance equation based on the collected data, and calculating reaction heat release and an equivalent heat transfer coefficient; s3, updating the model; s4, predictive control solution is carried out; s5, performing adaptive search; s6, carrying out security constraint; s7, stage identification; and S8, performing control execution. The reaction heat release amount and the equivalent heat transfer coefficient are calculated in real time through linkage of a heat balance calculation module and a model updating module, online parameter identification is achieved through a recursive least square algorithm, a heat model can be dynamically corrected along with working condition changes, it is ensured that a prediction model is consistent with the actual reaction process, and the prediction efficiency is improved. And the temperature prediction precision and the reliability of control response are obviously improved.

The invention relates to a halogen-free intrinsic flame-retardant waterborne polyurethane material and a preparation method thereof, and belongs to the field of functional polymer materials and fine chemical engineering. The halogen-based flame-retardant waterborne polyurethane disclosed by the invention is prepared from diisocyanate, long-carbon-chain polyether polyol, a catalyst, a chain extender, deionized water and a salt-forming agent through reaction; the hydrophilic chain extender is prepared from pentaerythritol, phosphorus oxychloride and p-hydroxyphenylpropionitrile through a reaction, and is a flame-retardant chain extender of a diamine structure containing phosphorus and nitrogen flame-retardant elements. The waterborne polyurethane material prepared by the method has a certain flame-retardant effect, and is simple in preparation process, relatively low in cost, very good in practicability and economical efficiency and good in market prospect.

The invention discloses a stirring device for fine chemical engineering and relates to the technical field of fine chemical engineering, the stirring device comprises a stirring tank and further comprises a stirring device, a feeding pipe is fixedly mounted at the top of the stirring tank, a discharging pipe is fixedly mounted at the bottom of the stirring tank, and a fixing plate is fixedly mounted at the top of the stirring tank; a rotating motor is fixedly installed at the top of the fixing plate, a rotating rod is fixedly installed at the output end of the rotating motor and rotationally penetrates through the top of the inner wall of the stirring tank, and an extrusion rod moves upwards to make contact with a displacement ring A and extrudes the displacement ring A to move upwards; the displacement ring A moves upwards to drive the stirring rod to move upwards to stir materials at different depths in the stirring tank, so that the materials at different depths can be uniformly mixed by stirring the materials at different depths in the stirring tank, uniform distribution of various materials in the stirring tank is ensured, and the mixing quality and efficiency of the materials are improved.

The invention relates to the technical field of fine chemicals, in particular to crosslinking-agent-free Pickering emulsion oil gel and a preparation method and application thereof.The preparation method comprises the following steps that S1, cellulose is subjected to TEMPO oxidation treatment and then subjected to high-pressure homogenization, and TEMPO oxidized nano cellulose is obtained; s2, mixing the TEMPO oxidized nanocellulose and lemon essential oil in proportion, and homogenizing to obtain Pickering emulsion; s3, carrying out heat preservation on the Pickering emulsion at the temperature of 70-90 DEG C for 6-12 hours to obtain Pickering emulsion gel, freezing the Pickering emulsion gel at the temperature of-80 + / -5 DEG C for 30-40 minutes until the Pickering emulsion gel is completely frozen, and carrying out freeze drying for 24-48 hours to obtain Pickering emulsion oil gel; and S4, soaking the Pickering emulsion oil gel in acetone for 6-12 hours, taking out the Pickering emulsion oil gel, and freeze-drying the Pickering emulsion oil gel for 24-48 hours to obtain the Pickering emulsion aerogel. The Pickering emulsion aerogel has better thermal stability, larger specific surface area, cumulative pore volume and average pore size, and is prepared without using a cross-linking agent for cross-linking.

The invention relates to the technical field of temperature control, and particularly discloses a micro-reactor real-time control system for fine chemical engineering, and the system comprises an acquisition module which calculates a standard temperature according to the temperature at a monitoring point, and periodically obtains the standard temperature in a preset acquisition period; the analysis module is used for calculating a temperature difference value, obtaining a maximum temperature difference value and obtaining a temperature change value; coordinate points are generated and fitted to obtain a fitted curve, and the total number of reference points on the fitted curve is counted; and the adjusting module is used for calculating the judgment value, determining whether to adjust the power of the temperature adjusting module or not according to the judgment value, and adjusting the power of the temperature adjusting module according to the fitting curve. According to the invention, the environment temperature in the microreactor can be kept stable, and the complexity of controlling the temperature in the pipeline is reduced.

The invention relates to the technical field of fine chemical engineering preparations, in particular to an environment-friendly non-silicon defoaming agent as well as a preparation method and application thereof. 3.6 to 5.1 parts of a defoaming aid; 0.24 to 0.35 part of a thickening agent; 2-3 parts of a dispersing agent; 2.6 to 3.5 parts of an emulsifier; 18 to 25.3 parts of an organic solvent; 65 to 82 parts of deionized water; wherein the polyether ester A and the polyether ester B with amphiphilic structures in the polyether ester can be quickly spread on the surface of foam, carry hydrophobic components to permeate a liquid membrane and accelerate foam breakage, and the defoaming assistant A and the defoaming assistant B further promote the defoaming and foam inhibition performance of the defoaming agent by reducing competitive adsorption to the defoaming agent and delaying release of active molecules. Compared with the prior art, the method has a wide application prospect.

The invention discloses a multifunctional composite material for mineralizing and storing CO2 based on fly ash and a preparation method of the multifunctional composite material. The material is prepared from high-activity fly ash subjected to plasma activation treatment, a nanoscale metal oxide catalyst, a metal organic framework, a functional organic ligand, an intelligent pH regulator, a solid suspension stabilizer and water. The preparation method comprises the steps of suspension preparation, high-pressure CO2 mineralization reaction in a reaction kettle, centrifugal separation and freeze drying treatment. The method is simple, the raw material cost is low, the prepared multifunctional composite material not only can remarkably improve the storage efficiency of CO2, but also can ensure that a stable carbonate product is generated, and the carbonate product has high specific surface area and excellent chemical stability, can be widely applied to the fields of high-end building materials, energy storage materials and fine chemical engineering, and has wide application prospects. And meanwhile, the high-added-value utilization of the industrial by-product fly ash is realized, and the dual purposes of reducing carbon emission and improving the utilization rate of solid wastes are achieved.

The invention belongs to the technical field of fine chemical reaction safety testing and automatic chemistry, and particularly discloses a nonlinear model predictive temperature control method of a semiconductor temperature control type synthesis reactor. The method comprises the following steps: constructing a dynamic heat transfer model of the system based on the semiconductor temperature control type synthesis reactor; designing a nonlinear model prediction controller according to the heat transfer model of the synthesis reactor; constructing a multi-constraint objective function for nonlinear predictive control according to the characteristics of the controlled object; and solving an optimal control sequence for the nonlinear model prediction controller by adopting a projection gradient method. Compared with a traditional PID temperature control algorithm, the temperature of the reactor can be accurately predicted and controlled through the designed nonlinear model prediction temperature control algorithm, it is ensured that the chemical reaction is conducted at the optimal temperature, and the robustness and adaptability of a control system are improved.

The invention relates to the technical field of fine chemicals, in particular to a method and a reaction device for online control of molecular weight of a polyphenyl ether product. The method for preparing the polyphenyl ether comprises the following steps: 1) adding oxygen and phenolic monomers into a reaction kettle containing a solvent and a catalyst for reaction; and 2) calculating the average molecular weight of the polyphenyl ether product in the reaction liquid in the step 1) according to the relationship between the viscosity, the temperature, the pressure or the material concentration and the average molecular weight of the polyphenyl ether product, adding a quenching agent to stop the reaction when the average molecular weight of the polyphenyl ether product reaches the target molecular weight, and performing post-treatment to obtain the polyphenyl ether. In the production process of polyphenyl ether, the molecular weight of the product is calculated in real time by monitoring viscosity, temperature, material concentration, pressure and other data, and the reaction endpoint is judged according to the calculation result, so that the reaction process is accurately controlled, and the production stability and the product quality consistency are ensured.

The invention discloses a coloring agent for an organic silicon product and a preparation method of the coloring agent, and belongs to the technical field of fine chemical engineering, and the coloring agent is characterized by being prepared from the following raw materials in parts by weight: 40 to 60 parts of inorganic pigment, 30 to 50 parts of silicone oil and 2 to 7 parts of dispersing agent; the dispersing agent comprises modified sodium alginate and lauryl sodium sulfate in a weight ratio of 1: (0.5-1.2), and the effects of solving the problems that the inorganic pigment is easy to form aggregates and poor in coloring effect are achieved.

The invention provides a dehydrogenation catalyst for preparing an aza-aromatic ring as well as a preparation method and application of the dehydrogenation catalyst, and belongs to the technical field of catalyst preparation. The dehydrogenation catalyst comprises a carrier with specific physical parameters, a first active metal component Pd, at least one of a second active metal component Re, Sn or Ir, and a P-containing active auxiliary agent. The dehydrogenation catalyst provided by the invention can be used for a dehydrogenation reaction of a nitrogen-containing heterocyclic compound as a raw material, the aza-aromatic ring can be directly obtained, the conversion rate of the raw material is 99% or above, the selectivity of the aza-aromatic ring product is 99% or above, the yield is 98-99%, and the service life of the dehydrogenation catalyst can reach 5500 h or above. The dehydrogenation catalyst can be used for preparing various nitrogen heteroaromatic rings with different carbon atom numbers, and is particularly used for preparing the nitrogen heteroaromatic rings by dehydrogenation of nitrogen-containing heterocyclic ring byproducts in the hexamethylenediamine production process, waste oil raw materials can be turned into wealth, and the waste oil raw materials are converted into fine chemicals with high additional value.

The invention discloses a preparation method and application of a bio-based zinc adenine salt environment-friendly PVC heat stabilizer, and belongs to the field of fine chemical synthesis and plastic additive application. The nitrogen-containing organic metal heat stabilizer adenine zinc complex is prepared by taking adenine and zinc acetate as main raw materials through a one-step method. The method is simple and environment-friendly in preparation process, easily available in raw materials and suitable for industrial production. The prepared heat stabilizer zinc adenine is used as a heat stabilizer, can effectively absorb hydrogen chloride generated by PVC thermal decomposition, and can replace allyl chlorine atoms, so that the heat stability of a PVC product is improved, PVC has more excellent heat stability, and the heat stabilizer is expected to replace a traditional commercially available heat stabilizer.

The invention relates to a method for preparing cyclohexanone by conversion of acetone and 1, 3-propylene glycol, and belongs to the technical field of chemical engineering. The method comprises the following steps: catalyzing a dialkylation reaction of acetone and 1, 3-propylene glycol by virtue of a supported nickel or palladium catalyst and a potassium phosphate cocatalyst, and removing water from acetone and 1, 3-propylene glycol which are equal in molar weight, so as to obtain cyclohexanone. The method contributes to the production of bulk chemicals and fine chemicals by a fermentation method, and makes a contribution to the strategic goal of low-carbon development.

The invention relates to the technical field of fine chemical engineering, and provides a method for synthesizing O-methyl-N-nitroisourea by a micro-channel reactor, which comprises the following specific steps: adding nitric acid into a four-neck bottle for cooling, dropwise adding fuming sulfuric acid, controlling the temperature of a mixed solution, adding sulfuric acid into the four-neck bottle, and reacting for 2-4 hours; stirring and a low-temperature constant-temperature reaction bath are started to cool sulfuric acid, disulfate is put into a four-opening bottle to prepare a disulfate sulfuric acid solution, a mixed acid metering pump is started, a disulfate sulfuric acid solution metering pump is started, the disulfate sulfuric acid solution is mixed and enters a nitration micro-channel reaction device, and after heat preservation of nitration liquid is completed, the nitration liquid is dropwise added till the temperature is lowered to 0 DEG C in advance; the preparation method comprises the following steps: adding water into a reaction kettle, dropwise adding while stirring, continuously cooling and preserving heat after dropwise adding, carrying out suction filtration on eluted feed liquid, and washing a filter cake with chilled water to obtain an O-methyl-N-nitroisourea wet product, so that the defects of long production period, low effective productivity, lower safety coefficient and relatively higher safety risk of a traditional method for synthesizing O-methyl-N-nitroisourea are overcome.

The present application relates to the technical field of fine chemical synthesis, and in particular to an efficient preparation process of octanoyl hydroxamic acid, which comprises the following preparation steps: S1, preparation of ethyl n-octanoate: 90-110 parts by weight of n-octanoic acid and 35-40 parts by weight of ethanol are mixed, and then a solid acid catalyst is added, and the mixture is heated to reflux for reaction for 2.5-3 hours, filtered to obtain a precipitate and a filtrate, and the filtrate is decompressed and distilled to obtain ethyl n-octanoate; S2, preparation of octanoyl hydroxamic acid: 0.4-0.6 parts by weight of sodium acetate and 0.2-0.4 parts by weight of sodium carbonate are added to water, stirred until dissolved, ethanol is added, and after stirring, 24-32 parts by weight of hydroxylamine and ethyl n-octanoate prepared in S1 are added to react to obtain octanoyl hydroxamic acid; the process has the advantage of improving the reusability of the solid acid catalyst.

A preparation method for a water-based EVA treatment agent, relating to the technical field of fine chemicals. The preparation method for a water-based EVA treatment agent is implemented by means of a preparation device for a water-based EVA treatment agent. The preparation device for a water-based EVA treatment agent comprises a reaction kettle (1); a driving mechanism (2) is arranged inside the reaction kettle (1); a water-cooling mixing mechanism (3), a rotary dripping mechanism (4), a rapid water supply mechanism (5), and a scraping mechanism (6) are sequentially arranged on the outer side of the driving mechanism (2) from top to bottom; the rotary dripping mechanism (4) and the rapid water supply mechanism (5) divide the interior of the reaction kettle (1) into an upper cavity, a middle cavity, and a lower cavity. The method can effectively reduce waste of epoxy-terminated polyether silicone and improve the quality of a finished product, can further effectively shorten the time required for adding raw material water and then improve the efficiency of preparation of the water-based EVA treatment agent, and thus is more suitable for industrial preparation of the water-based EVA treatment agent.

The invention relates to the field of fine chemical engineering, and discloses a green process for preparing chloramine T by a continuous flow reactor. The method comprises the following steps: respectively pumping p-toluenesulfonamide, a sodium hydroxide solution and a sodium hypochlorite solution into a micro-channel mixer for instantaneous mixing, and carrying out chlorination reaction in a multi-stage temperature control tubular reaction unit; the concentration of free chlorine is detected on line at an outlet, and the flow rate of a chlorine source is dynamically adjusted through a PID algorithm, so that closed-loop control is realized; the reaction liquid is directly crystallized and separated to obtain the product without alkali wash. The system comprises a base solution and chlorine source conveying subsystem, a micro-channel mixer, a multi-stage reaction unit, an online monitoring module, a central controller and a crystallization unit. The side reaction is inhibited from the source, so that the free chlorine is less than or equal to 0.5 mg / L, the alkali washing step is omitted, the COD (Chemical Oxygen Demand) of the wastewater is reduced by more than 80%, the product purity is more than or equal to 99.5%, and the productivity is improved by 3 times.

The invention discloses a method for preparing cyclohexylamine based on reductive amination of cyclohexanone, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: adding a reactant cyclohexanone into a reaction kettle containing a certain amount of solvent, ammonia water and hydrogen atmosphere, and carrying out reductive amination reaction in the presence of a catalyst to obtain cyclohexylamine. The catalyst is CoyAl-LDHs loaded with metal active components, the CoyAl-LDHs are layered cobalt-aluminum bimetal hydroxides, and cobalt ions and precious metal ions in laminates are subjected to spontaneous oxidation-reduction reaction, so that the precious metal ions can be efficiently reduced into active metal nanoparticles. The layered cobalt-aluminum double-metal hydroxide not only has abundant surface acid-base sites, but also has high dispersity of loaded metal nanoparticles. The catalyst preparation and reductive amination reaction conditions are mild, the yield is high, the reaction system is simple and easy to separate, and the method is suitable for industrial production of cyclohexylamine.

The present invention relates to the field of fine chemical technology, and more particularly to IPC C09D163, and more specifically to a flame retardant super hydrophobic coating and its use method. In the present invention, firstly, a low surface energy organosilicon-modified polyurethane prepolymer Si-PUA is synthesized by reacting organosilicon with diisocyanate, and then Si-PUA and P-N halogen-free flame retardant modified epoxy acrylic resin mixed solution are sprayed on the surface of the base to form a low surface energy coating; Then, the nano-silicon dioxide modified by IEM is sprayed on the Si-PUA coating to form a double-layer structure, and cross-linked by a photoinitiator, so as to improve the super hydrophobicity and flame retardant properties of the coating.

The invention belongs to the field of fine chemical engineering, and particularly relates to a continuous production device and method of high-purity isosorbide. The device comprises a reaction unit, a separation unit and a purification unit which are sequentially connected, the reaction unit comprises a preheater and a reactor, the separation unit comprises a settling tank, a filter, a dehydrating tower and a distillation tower, and the purification unit comprises a decolorizing tower, a rectifying tower and a crystallizing tower. A sorbitol raw material enters a preheater to be preheated, the preheated material enters a reactor to be subjected to a dehydration reaction, the reacted material flows out of a discharging port in the upper portion of the reactor to enter a shell pass of a dehydration tower to be subjected to heat exchange and cooling, the cooled material enters a settling tank to settle solid waste, supernate enters a filter to be filtered, and a liquid phase flows into the dehydration tower to be subjected to water removal and concentration; and distilling out crude isosorbide in a distillation tower, and purifying the isosorbide crude product through a decolorizing tower, a rectifying tower and a crystallizing tower to obtain the high-purity isosorbide. The method has the outstanding characteristics of continuous production, separation and purification, and continuous production of high-purity isosorbide can be realized.

The invention belongs to the field of fine chemical engineering, and particularly relates to an N-heterocyclic carbene complex catalyst and application of the N-heterocyclic carbene complex catalyst in pipelined continuous synthesis of a silane coupling agent. The invention provides an N-heterocyclic carbene complex catalyst, which comprises a ligand and an active component, the ligand is an N-heterocyclic carbene ligand, and the active component is a transition metal; the molar ratio of the N-heterocyclic carbene ligand to the transition metal is 1: 1. The invention also provides a method for pipelined continuous synthesis of the silane coupling agent, which comprises the following steps: carrying out homogeneous hydrosilylation reaction in a pipelined reactor by taking hydrogen-containing silane and unsaturated hydrocarbon as raw materials in the presence of an N-heterocyclic carbene complex catalyst to obtain the silane coupling agent. The spatial configuration and the electronic property of the N-heterocyclic carbene ligand precursor are designed and regulated, so that the N-heterocyclic carbene ligand precursor is matched with transition metal, and the N-heterocyclic carbene ligand precursor can be applied to hydrosilylation reaction.

The invention relates to the technical field of fine chemical engineering and flame retardant preparation, and discloses a preparation method of bromo-triazine capable of improving thermal stability, and the preparation method comprises the following steps: mixing phenol, water and dichloromethane, controlling the temperature, and carrying out oxidative bromination reaction to prepare an organic phase containing tribromophenol; then, under the action of an organic amine catalyst, carrying out condensation reaction on the organic phase, liquid caustic soda and cyanuric chloride; after the reaction, washing with water to remove impurities; and in the presence of process water, firstly controlling the temperature at 38-42 DEG C for azeotropic desolvation, then raising the temperature to 85-95 DEG C for high-temperature crystallization and crystal growing, and finally cooling, filtering and drying to obtain the bromo-triazine product. By utilizing the high selectivity of the organic amine catalyst and a two-stage azeotropic crystallization process, the side reaction is effectively reduced, the solvent wrapped in the crystal is eliminated, the prepared product is high in main content and extremely low in volatile component, the temperature can reach 370 DEG C or above when the thermal weight loss is 2%, and the thermal stability is remarkably improved.

The invention discloses a mechanical force-induced fluorescence discoloration sensor material as well as a preparation method and application thereof, and relates to the technical field of organic synthesis and fine chemical engineering. The preparation method comprises the following steps: step 1, carrying out heating reaction on 4-(1, 2, 2-triphenyl vinyl) benzaldehyde, 3-(2, 2-dicyano-1-(3, 4-diaminophenyl) vinyl) benzene-1-yl and a catalyst to prepare a compound 1-1; and 2, carrying out heating reaction on the obtained compound 1-1 and methyl iodide under the action of alkali and a solvent, and analyzing and purifying to obtain a compound 1-2. The compound disclosed by the invention is low in preparation cost, simple and convenient to operate and simple in method, the compound shows the material characteristic of mechanical force-induced fluorescence discoloration and can be applied to the fields of sensors, dyes, anti-counterfeiting and the like, and meanwhile, the synthesis method can be used for synthesis in the fields of fine organic chemical engineering such as luminescent materials, printing and dyeing technologies and the like.

The invention relates to the technical field of heterogeneous catalysis and fine chemical engineering, and discloses a rhodium-tungsten para-site MOF-based catalyst as well as preparation and application thereof. The invention relates to a rhodium-tungsten para-site MOF-based catalyst, which is composed of a catalytic active component, a metal additive and a carrier. The rhodium-tungsten para-site MOF-based catalyst provided by the invention takes a metal organic framework material as a carrier, an active component Rh and a metal additive W are stably anchored on the surface of the carrier, and an Rh-WOx para-site is successfully constructed; the rhodium-tungsten para-site MOF-based catalyst provided by the invention shows excellent catalytic activity and excellent cycle stability in olefin hydroformylation reaction, and overcomes the technical bottlenecks that noble metals in a homogeneous catalysis system are easy to lose and energy consumption is high in a product separation process; an efficient and stable catalyst design thought is provided for olefin hydroformylation reaction, and the catalyst has a good industrial application prospect.

The invention discloses a fine chemical engineering adaptive control optimization system based on digital twinning, and belongs to the field of chemical engineering control. Comprising an acquisition processing module, a process twinning module, a fusion calibration module, a sensing prediction module, a decision optimization module, an execution optimization module, a simulation verification module, a causal diagnosis module, a self-healing control module and a tracking monitoring module. According to the method, adaptive updating and high-fidelity prediction of the model are realized, the deviation of the traditional mechanism model is effectively reduced, the system has the capability of identifying abnormity and risk in advance, the intelligent level of control decision is improved, process disturbance can be responded in real time, operation parameters can be rapidly adjusted, and the stability and robustness of the production process are improved.

The invention discloses a microfluidic nitration reaction platform based on in-situ Raman and a reaction optimization method. The platform integrates a microreactor, an in-situ Raman detection module, a spectrogram processing and quantifying module, an experimental optimization module and a central control module, and is suitable for monitoring and optimizing complex reactions under a non-mutual solution phase plunger flow system. According to the method, an indirect hard modeling (IHM) method is used for processing an overlapped Raman spectrogram, a standard curve is combined for establishing a multi-component concentration prediction model, and high-precision quantification of reactants and products is realized. According to the platform, a Gaussian process model is combined with dynamics prior, a multi-target Bayesian optimization process based on expected hypervolume improvement (EHVI) is driven, and Pareto optimal conditions in a temperature and residence time space are effectively explored. The system has the functions of automatic focusing sampling, spectrogram real-time decoupling, concentration inversion and experimental condition decision making, and is suitable for intelligent reaction development and optimization in the fields of fine chemical engineering, high-throughput reaction screening and the like.

The invention relates to a method for preparing industrial-grade monopotassium phosphate by using a double decomposition extraction method, and belongs to the technical field of fine chemical engineering. The monopotassium phosphate product is prepared from phosphate, sylvite and sulfuric acid through double decomposition and extraction processes. According to the technology, in the reaction process, generated monopotassium phosphate is dissolved in a water phase, generated calcium sulfate dihydrate is precipitate, and the monopotassium phosphate and the calcium sulfate dihydrate can be separated through a simple solid-liquid separation method. A small amount of hydrochloric acid contained in the filtrate can be separated through extraction, so that a byproduct ammonium chloride product is obtained while a high-quality industrial-grade monopotassium phosphate product is obtained. The preparation method disclosed by the invention has the advantages in cost and product quality, the process is easy to realize, and meanwhile, the extraction agent can be recycled.

The invention discloses a boron-containing copper-based three-dimensional metal organic framework material as well as a preparation method and application thereof, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: preparing Zn-based MBON from zinc salt, boric acid and imidazole through a hydrothermal method, and then completely replacing the zinc component with copper to obtain Cu-based MBON, namely the boron-containing copper-based three-dimensional metal organic framework material. The specific surface area of the material is large, and a three-dimensional nano flower-shaped unique structure is formed. The prepared material is used as a catalyst for furfural electro-hydrogenation and carbon dioxide reduction reaction, the diffusion efficiency of reactants (such as furfural and CO2) can be enhanced, rapid desorption of products (such as furfuryl alcohol and ethylene) can be promoted through the surface capillary action, meanwhile, generation of by-products caused by excessive reaction is inhibited, and the selectivity of target products is improved.

The invention belongs to the technical field of fine chemical preparation, and discloses a method for directly preparing dimethyl carbonate by catalyzing carbon dioxide and methanol through nano cerium oxide, which comprises the following steps: step S10, weighing nano cerium oxide, methanol and a deep eutectic solvent; s20, putting the weighed nano cerium oxide, methanol and the deep eutectic solvent into a beaker, and stirring and mixing; s30, adding the mixed solution into a reaction kettle, introducing carbon dioxide to replace air in the reaction kettle, and then heating the reaction kettle; s40, after the reaction kettle is cooled to the normal temperature, releasing the pressure and taking out the dimethyl carbonate; according to the scheme, by adding the deep eutectic solvent, water and a product in the reaction are separated, the reaction is promoted, homogeneous reaction and heterogeneous separation are realized, the highest conversion rate of methanol can reach 49.70%, and the selectivity of dimethyl carbonate exceeds 99%; the invention solves the problem of low conversion rate of the existing dimethyl carbonate preparation method.