3939 results about "Mother liquor" patented technology

The invention discloses an intelligent water and fertilizer integrated precise irrigation control method. The method comprises the following steps: step 1, establishing a multi-modal data acquisition network; step 2, inputting the data obtained in the step 1 into a trained LSTM neural network, and predicting future crop transpiration water demand; 3, according to nutrient concentration distribution fed back by a soil conductivity sensor in real time, combining with a water and fertilizer coupling migration model, dynamically calculating a nitrogen-phosphorus-potassium ratio of each irrigation zone, realizing precise mixing of a fertilizer mother solution and irrigation water through a three-channel proportioning pump, and implementing a variable irrigation decision; 4, dynamically adjusting the pulse irrigation duration of each branch through an MPC algorithm; and step 5, recovering the residual liquid at the tail end of the pipe network to a buffer tank, detecting the EC value of the recovered liquid through an electrochemical sensor, and taking the EC value as a reference parameter automatic correction proportioning algorithm of the next irrigation period. Accurate control over the irrigation process can be achieved, so that the water and fertilizer utilization efficiency is improved, and resource waste and environmental pollution are reduced.

The invention discloses an intelligent supervision and regulation system for steam recompression mother liquor wastewater treatment, which relates to the technical field of production monitoring and is characterized in that a plurality of water quality parameters are monitored and analyzed in real time by integrating a water quality monitoring module, a data fusion module, a flow monitoring module, a control center, an automatic regulation module and a feedback control module; the data fusion module uses a machine learning algorithm to train historical data and performs abnormity prediction and water quality fluctuation identification based on real-time data, the control center combines flow and water quality prediction data to calculate the adjustment demand of the wastewater treatment equipment and generate an adjustment instruction, and the automatic adjustment module dynamically optimizes the operation state of the equipment according to the instruction. The feedback control module compares the real-time water quality data with the adjusted water quality, generates a feedback signal and further optimizes an adjustment instruction, so that the accuracy and stability of equipment adjustment in the wastewater treatment process are ensured, deposition or volatilization of heavy metals or organic compounds is effectively prevented, the water quality is ensured to reach the standard, and the environmental influence is reduced.

The invention discloses a multi-parameter coupling intelligent regulation and control method and system in a vanadium ore smelting process, relates to the technical field of non-ferrous metal smelting automatic control, and solves the problems of feeding deviation and resource chain scission caused by slow response of an existing heat balance model to ore impurity fluctuation, online sensing lag and process island. The impurity concentration and the dielectric constant are obtained in real time through an LIBS / XRF combined probe and a microwave dielectric spectrum, rheological disturbance is dynamically corrected through extended Kalman filtering, a dynamic coupling response model is input, a thermodynamic interference factor is calculated, and a leaching and precipitation strategy is generated; performing mother liquor tail gas material flow collaborative optimization in parallel, constructing a multi-dimensional control vector U, performing iterative updating through near-end strategy optimization in a digital twin and issuing the multi-dimensional control vector U to an edge PLC (Programmable Logic Controller) in a distributed manner, and finally correcting a model weight through online XRD (X-Ray Diffraction) feedback; according to the method, the adaptive capacity to complex vanadium ore component disturbance, the response precision of online control and the inter-process resource circulation efficiency are remarkably improved.

The invention relates to the technical field of additives for concrete, and particularly discloses a waterproof synergistic interface agent, an interface permeation type water reducing agent mother solution, an interface permeation type water reducing agent and a preparation method of the interface permeation type water reducing agent. The waterproof synergistic interface agent is prepared from the following raw materials: organic acid modified nano inorganic powder and polyhydroxy acrylate. Through the design of the raw materials of the waterproof synergistic interface agent, the surface active groups, the adsorption performance and the dispersity of the nano inorganic powder are increased, the grafting degree of polyhydroxy acrylate with other large monomers, small monomers and functional monomers is improved, the polyhydroxy acrylate is grafted or dispersed in a water reducing agent mother solution through a polymerization reaction, and the waterproof synergistic interface agent is prepared. By combining the synergistic anti-seepage filling effect of the nano inorganic powder, the internal phase interface structure of the concrete is improved, the adhesiveness of different interfaces and the binding force of new and old concrete interfaces are increased, and the hydration hardening product can improve the compactness and toughness of the concrete and improve the ion penetration resistance and mechanical property of the concrete; the problem that an existing water reducing agent is single in function is solved.

The invention provides a fertilization control method and system, and belongs to the technical field of smart agriculture, and the method comprises the steps: determining a target element-deficient region based on a multispectral remote sensing image of a target region crop, a crop type and a crop growth stage; inputting the multispectral reflectivity data, the soil nutrient data and the crop growth stage of the target nutrient-deficient area into a preset nutrition diagnosis model to obtain a deficient nutrient element type and a deficient degree; inputting the nutrient element type, the lack degree, the soil nutrient data, the crop growth stage, the planned irrigation water amount and the fertilizer mother liquor concentration into a water and fertilizer decision model, and calculating to obtain the target fertilizer liquor concentration and the total fertilizer demand; and controlling the fertilization device to adjust the mother liquor injection proportion and the irrigation flow based on the target fertilizer solution concentration and the total fertilizer demand. The fertilization control method and control system provided by the invention realize accurate regulation and control of water and fertilizer, not only can improve the utilization rate of water and fertilizer, but also can improve the yield and quality of crops.

The invention provides a lithium precipitation mother liquor lithium recovery method based on countercurrent centrifugal extraction. The method comprises the following steps: S1, pretreating a lithium precipitation mother liquor to obtain a lithium-containing pre-extraction solution; s2, conveying the lithium-containing pre-extraction liquid to a centrifugal extraction system, fully mixing the lithium-containing pre-extraction liquid with an organic phase, and sequentially carrying out multi-stage countercurrent centrifugal extraction; performing phase splitting to obtain raffinate and a lithium-loaded organic phase; s3, the lithium-loaded organic phase enters a washing section to be subjected to multi-stage countercurrent centrifugal washing; s4, performing multi-stage countercurrent centrifugal reverse extraction on the washed lithium-loaded organic phase to obtain a lithium-rich solution; and S5, synthesizing the lithium-rich solution and a sodium carbonate solution to obtain the battery-grade lithium carbonate. The lithium recovery method has the characteristics of rapidness, high efficiency, low equipment investment, small occupied area, less extraction agent consumption and short process flow.

The invention discloses a method for purifying p-dioxanone by coupling vacuum distillation with solution crystallization, which comprises the following steps of: firstly, removing light and heavy impurities from a p-dioxanone crude product in a vacuum distillation manner; and the rectified and purified p-dioxanone enters a crystallizer to be subjected to solution crystallization operation to obtain high-purity p-dioxanone, and crystallization mother liquor is returned to vacuum rectification after the solvent is removed.

The invention relates to a phenolic resin modified carbon molecular sieve and a preparation method and application thereof, and belongs to the technical field of adsorbents. The technical problem to be solved by the invention is to provide the phenolic resin modified carbon molecular sieve, and the adsorption selectivity is improved. The method comprises the following steps: a, in-situ polymerization: mixing phenolic resin polymerization mother liquor with a carbon molecular sieve, standing for adsorption, and heating the adsorbed carbon molecular sieve for polymerization reaction to obtain a polymerization product; the phenolic resin polymerization mother liquor comprises a phenolic substance, an aldehyde substance and a solvent; and b, carbonization modification: roasting the polymerization product in a protective atmosphere to obtain the phenolic resin modified carbon molecular sieve. The carbon molecular sieve is modified through phenolic resin in-situ polymerization, and the method is simple, low in cost, high in reaction controllability and suitable for industrial production. The phenolic resin modified carbon molecular sieve has selective adsorbability, can be applied to an N2 / CH4 system, selectively adsorbs N2, and is high in separation ratio and good in stability.

The invention discloses silver powder with a high twin crystal ratio and a preparation method and application of the silver powder with the high twin crystal ratio. The preparation method comprises the following steps that S1, a carboxylic acid coordination agent is added into a silver source solution, and a silver precursor solution is obtained; sequentially adding a dispersing agent and an initiator into the reducing agent solution to obtain a reaction base solution; s2, a silver precursor solution is added into the reaction base solution for an oxidation-reduction reaction, then curing is conducted, and mixed mother liquor is obtained; s3, the mixed mother liquor is filtered, washed, dispersed and dried, and then the silver powder with the high twin crystal proportion is obtained; the initiator comprises one or more of sulfate, carbonate and nitrate; through the synergistic effect of the initiator and the carboxylic acid coordination agent, the silver ion release rate and the crystal nucleus preferential growth direction are regulated and controlled, the rapid feeding and curing technology is combined, the low supersaturation environment is constructed, the silver powder is induced to grow in the specific direction, and the twin crystal proportion is remarkably increased.

The present application discloses a method for recycling and preparing lithium iron phosphate from waste lithium iron phosphate batteries, which comprises the following steps: oxidizing and acid-leaching the recycled lithium iron phosphate battery powder to obtain acid-leached lithium solution and iron-phosphorus filter residue; adjusting the pH of the acid-leached lithium solution for purification and concentration, adding a phosphorus source and adjusting the pH to 9.5 - 10.5 to obtain solution A; subjecting the iron-phosphorus filter residue to secondary acid-leaching, iron dissolution, adding a phosphorus source and adjusting the pH to 6.5 - 7.5 to obtain solution B; mixing solution A and solution B for coprecipitation reaction, and filtering to obtain lithium iron phosphate precursor and reaction mother liquor; subjecting the lithium iron phosphate precursor to anaerobic drying, mixing with a carbon source and sintering to prepare a carbon-coated lithium iron phosphate cathode material. The method provided by the present application has the advantages of short recycling path, few reaction by-products and environmental friendliness, and can recycle all components of lithium, iron and phosphorus in the waste lithium iron phosphate battery powder. At the same time, the by-product is ammonium sulfate, a high-quality fertilizer raw material, which has great application prospects.

The invention relates to a method for recovering mixed salts (mainly containing calcium chloride, sodium chloride and potassium chloride) from a household garbage incineration fly ash leaching solution, and particularly provides two separation technical schemes. The traditional separation method generally needs to use a large amount of decalcifying agent, so that the cost is high, calcium chloride cannot be effectively recycled, and the problem of resource waste exists. In order to solve the problems, the invention selectively dissolves calcium chloride in the mixed salt by adopting a specific organic solvent (such as ethanol or methanol) and utilizing the characteristics that the solubility of calcium chloride in the solvent is high, the solubility of sodium chloride and potassium chloride is low, and the boiling point is relatively low. And a calcium chloride product can be recovered after solvent evaporation. Furthermore, the residual mixed salt is further washed using the specific organic solvent to remove entrained calcium chloride, thereby obtaining a mixed salt containing predominantly sodium chloride and potassium chloride. According to the technical scheme 1, the mixed salt subjected to separation and calcium removal is subjected to dissolution treatment under the high-temperature condition, potassium chloride is dissolved, the particle size of sodium chloride crystals is promoted to be increased, the sodium chloride crystals are obtained through solid-liquid separation, and then mother liquor is cooled and crystallized to recover potassium chloride. According to the technical scheme 2, the mixed salt subjected to separation and calcium removal is subjected to aging treatment so as to promote particle size increase of sodium chloride and potassium chloride crystals, then the aged mixed salt is separated by adopting a flotation method, and sodium chloride and potassium chloride products are recycled respectively.

The invention discloses a method for comprehensively recovering valuable elements from a waste lithium iron phosphate battery material. The method comprises the following steps: carrying out alkali leaching on black powder and / or pole piece materials of the waste lithium iron phosphate batteries, and then carrying out solid-liquid separation to obtain alkali leaching residues and an alkali leaching solution; carrying out acid leaching on the alkaline leaching residues, and then carrying out solid-liquid separation to obtain an iron oxide powder product and an acid leaching solution; the alkali leaching liquid is cooled and crystallized to obtain a sodium phosphate product and crystallization mother liquor, and the crystallization mother liquor can be circularly used for the alkali leaching process; adjusting the pH value of the acid leaching solution, precipitating and separating to obtain a lithium phosphate product and a lithium precipitation mother solution, wherein the lithium precipitation mother solution can be used for preparing a sodium sulfate product. The method can effectively separate iron, phosphorus and lithium products, and is high in recovery rate, simple, short in process, low in cost and suitable for industrial application.

The invention relates to the technical field of industrial production wastewater treatment, and particularly provides a resource utilization method of calcium chloride high-salt water containing high-concentration organic matters. The method comprises the steps of pretreatment, wet catalytic oxidation, salt type conversion, softening filtration, deep oxidation, nanofiltration purification and targeted adsorption, no residual mother liquor exists, no secondary pollution is generated, organic matters in effluent are stable and reach the standard, the water quality and water quantity fluctuation resistance is high, heterogeneous and homogeneous catalysts are combined for catalysis, and the purification effect is good. According to the method, the sodium chloride solution is used as a raw material, the homogeneous catalyst is recycled, in addition, most of salt in the homogeneous catalyst is also recycled, resource reutilization is fully achieved, the treatment cost is reduced, and the treated sodium chloride solution can be used as primary saline water for subsequent ion membrane electrolysis.

The invention provides a method for recovering lithium in lithium precipitation mother liquor, which belongs to the technical field of hydrometallurgy and comprises the following steps: (1) activating a titanium adsorbent: activating the titanium adsorbent by using an acid solution; (2) adsorption: adsorbing lithium in the lithium precipitation mother liquor by using an extruded titanium adsorbent; (3) material washing: washing the adsorbent after adsorption by using pure water; (4) analysis: carrying out circulating analysis on the washed adsorbent by using hydrochloric acid with corresponding concentration to obtain a lithium-rich analysis solution; and (5) refluxing the lithium-containing desorption solution to the lithium precipitation unit. The extruded adsorbent used in the invention has high adsorption capacity and good ion selectivity, and by using the method, the high lithium recovery rate can be ensured, the interference of carnallite ions on lithium recovery can be avoided, the energy consumption is low, and the reduction of the operation cost is facilitated.

The invention belongs to the technical field of reaction crystallization type solid-liquid separation, and particularly relates to filtering equipment with a reaction aging crystallization function. The device comprises a reaction kettle and a centrifugal filter disc which is located in the reaction kettle and can rotate and ascend and descend, and a reserved channel for materials to ascend and filter cakes to descend is formed between the disc edge of the centrifugal filter disc and the inner wall of the reaction kettle; the upper disc surface of the centrifugal filter disc is provided with a filter surface, a kettle cavity of the reaction kettle is communicated with a liquid accumulation cavity positioned in the centrifugal filter disc through the filter surface, the liquid accumulation cavity is communicated with a mother liquor outlet through a transition channel, and a slag outlet for discharging filter cakes is formed in the bottom of the reaction kettle. Through vertical reciprocating motion of the filter disc and multi-dimensional motion of rotation, rapid filtering and centrifugal discharging functions of materials needing reaction, aging and crystallization operation are achieved, smoothness of a filtering medium channel can be effectively guaranteed, and the effects of being simple in structure and compact in structure are achieved.

The invention relates to the technical field of non-ferrous metallurgy, and discloses a dissolution method of high-iron-monohydrate-boehmite type bauxite. The method comprises the following steps: (1) preparing mixed ore pulp from high-iron monohydrate bauxite, sodium aluminate circulating mother liquor and an additive; the additive is one or a mixture of more of organic alkali, carboxylic acid and amino acid; (2) the mixed ore pulp is subjected to ultrasonic treatment and then heated to 190-280 DEG C for a dissolution reaction, dissolution slurry and dissolution residues are obtained, the dissolution residues are subjected to magnetic separation and recovery, and iron ore concentrate is obtained; the power of the ultrasonic treatment is 200 to 300W, and the time of the ultrasonic treatment is 30 to 50 minutes. According to the method, the problem that iron minerals are difficult to separate due to silicon minerals in the dissolution process of the high-iron monohydrate bauxite is solved. The method is simple in process, low in production cost, low in equipment requirement and good in industrialization prospect.

The present invention relates to the technical field of alumina production. The present invention discloses a waste heat recovery device for a roasting furnace, which comprises a flue gas fan, a heat exchange pipeline and an exhaust hood. A flue gas pipeline is arranged at the inlet of the flue gas fan and communicated with an external roasting furnace. The outlet of the flue gas fan is communicated with a plurality of heat exchange pipelines. The top ends of the heat exchange pipelines are jointly communicated with the exhaust hood. A flue gas outlet pipe is arranged at the top of the exhaust hood, and an outlet valve is arranged on the flue gas outlet pipe. It is characterized in that: a converging throat is arranged in the middle of the heat exchange pipeline, and a diffusor wall with horizontal displacement is arranged above the throat. The advantages of the present invention compared with the prior art are as follows: by performing heat exchange while pressurizing the flue gas flow, the water vapor contained in the flue gas can be liquefied and release heat, and its latent heat of vaporization can be fully released and absorbed. For the field to which the present invention is applied, the latent heat of vaporization can be used to heat mother liquor and flat plate washing water, saving the steam cost for heating flat plate washing water, reducing energy consumption and reducing emissions.

The present invention discloses a method for producing manganese monohydrogen phosphate trihydrate, a method for recycling Mn-containing mother liquor, and a cathode material, relating to the technical field of lithium-ion batteries. In the present invention, a solid manganese carbonate slurry is used as a bottom liquid to synthesize manganese monohydrogen phosphate. Through precipitation solid-phase transformation, an octahedral morphology feature is constructed, which has a larger specific surface area. During the subsequent synthesis of lithium iron manganese phosphate, it helps to improve the reactivity of Mn and form a more uniform lithium iron manganese phosphate cathode material, thereby improving the compaction capacity and electrochemical performance of the cathode material.

The invention provides a potassic salt ore old brine-tail salt full-recycling cemented filling process based on magnesium-calcium synergistic conversion, and belongs to the field of potassic salt ore goaf filling, CaO is added into old brine for reaction to obtain Mg (OH) 2 / Ca (OH) 2 mixed precipitate, then a dispersing agent is added, and solid-liquid separation is performed to obtain a solid mixture and a post-reaction mother solution; dividing the tail salt into particle sizes gt according to particle sizes; the method comprises the following steps: mechanically grinding coarse tail salt with the particle size of 75 microns and fine tail salt with the particle size of less than or equal to 75 microns until the particle size lt is reached; filtering to obtain activated crude tail salt; mixing the fine tail salt with an exciting agent, and activating through ball milling to obtain activated fine tail salt; and mixing the activated crude tail salt, the activated fine tail salt, the solid mixture and the reacted mother liquor, adding a retarder and a water reducing agent, stirring to obtain filling slurry, and pumping the filling slurry into a well for filling in multiple layers. According to the method, Mg < 2 + > in old brine is directionally converted through calcium oxide to generate a Mg (OH) 2 / Ca (OH) 2 gelling phase, and a low-cost and high-strength filling system is formed by combining a tail salt grading activation technology.

The invention discloses a porphyrinyl prismatic coordination molecular cage and a preparation method and application thereof.The preparation method comprises the steps that H2TMPP, Au (III) metal salt and Pd (OAc) 2 are dissolved in a solvent, an acidity regulator is added, after hydrothermal treatment, mother liquor is removed, obtained crystals are washed, and the porphyrinyl prismatic coordination molecular cage Pd-TMPP (Au) is obtained. 6 PdCl2 units and ligand combinations (H2TMPP) x [TMPP (Pd)] y [TMPP (Au)] zClz form 10 complexes in total, and the Pd-TMPP (Au) comprises at least 5 of the complexes. According to the invention, a Pd-TMPP (Au) hexagonal prism high-entropy coordination molecular cage based on Au (III) is synthesized by using a hydrothermal method, and the unique arrangement mode of the (metal) ligands in the cage inhibits pi-pi stacking of a porphyrin photosensitizer, so that the effect of PDT is improved.

The invention relates to a purification method of penta (dimethylamino) tantalum, and relates to the technical field of purification of amino metal compounds. In a standard glove box with the oxygen content lower than 2 ppm and the water content lower than 0.01 ppm, taking a proper amount of sublimated crude product penta (dimethylamino) tantalum, putting the sublimated crude product penta (dimethylamino) tantalum into a dry and clean sample bottle, adding a solvent after water and oxygen removal to dissolve the penta (dimethylamino) tantalum, and filtering; and then cooling and crystallizing, slowly reducing the temperature until crystals are separated out, and slowly crystallizing to generate faint yellow micro-transparent crystals. After crystallization is completed, filtering is conducted again in a low-temperature state, and crystals are dried in vacuum. And after the mother liquor is desolventized to evaporate out the solvent, the recovered crude product penta (dimethylamino) tantalum can be sublimated and recycled again.

The invention discloses a method for preparing high-purity nickel acetate from crude nickel carbonate in the technical field of nickel compound purification, which comprises the following steps: mixing the crude nickel carbonate with deionized water to obtain a suspension, and adding glacial acetic acid to react to obtain a nickel acetate solution; then a specially-made hierarchical-pore titanium silicalite molecular sieve loaded bimetallic nanocluster material is added for purification treatment, the material is obtained through precise preparation, the method comprises the steps of carrier modification, bimetallic loading, hydrophobic modification, activation balance and the like, and the material has excellent impurity adsorption capacity and chemical stability; carrying out concentration crystallization and solid-liquid separation on the purified solution to obtain wet nickel acetate crystals; the mother liquor is subjected to adsorption treatment again, crystals in the mother liquor are recycled, and finally all the crystals are combined and dried to obtain a high-purity nickel acetate product. The process is simple and efficient, the purity of the prepared nickel acetate exceeds 98.5%, the content of each impurity is superior to the industrial standard, and the mother liquor can be recycled, is environment-friendly and is suitable for industrial production.

The invention discloses a novel process for preparing battery-grade lithium carbonate from lithium precipitation mother liquor. The process comprises the following steps: mixing quick lime and the lithium precipitation mother liquor, adjusting alkali and removing fluorine; filtering calcium ions in the mixed solution, calcining the filtered calcium slag, and supplementing quick lime and carbon dioxide; mixing the obtained filtrate with an organic extraction agent for extraction; mixing the obtained loaded organic phase with pure water, and washing; carrying out reverse extraction on the obtained washed loaded organic phase; the obtained strip liquor is subjected to oil removal; decalcifying the deoiled strip liquor through resin; and pyrolyzing the obtained strip liquor, filtering and drying to obtain battery-grade lithium carbonate, and circulating the pyrolyzed liquor back to the strip-extraction section to supplement the water phase. According to the method, the mother liquor obtained after lithium precipitation of the lepidolite leaching solution serves as the raw material, the extraction-carbon dioxide reverse extraction process is carried out after alkali adjustment, the technological process is greatly shortened, the lithium recovery rate is increased, and the problems that energy consumption is large due to the fact that the lithium precipitation mother liquor is concentrated again or the grade of the lithium precipitation raw material solution is reduced due to the fact that the lithium precipitation mother liquor and the leaching solution are mixed are solved.

The invention provides a preparation method of super absorbent resin, and relates to the technical field of super absorbent resin. The preparation method comprises the following steps: diluting acrylic acid with water, and adding alkali liquor for neutralization to obtain a neutralized solution; mixing an emulsifying agent, a thickening agent and foaming carbonate to obtain a foaming promoting auxiliary agent; adding a cross-linking agent, a photoinitiator and a temperature initiator into the neutralization solution to obtain a polymerization mother solution; uniformly mixing a foaming promoting auxiliary agent with the polymerization mother liquor, and initiating polymerization of the polymerization mother liquor under a UV illumination condition to obtain acrylate polymer gel; drying the acrylate polymer gel, and crushing and screening to obtain basic particles; and spraying a surface cross-linking treatment liquid on the surfaces of the basic particles, initiating a surface cross-linking reaction of the basic particles through heat treatment, and adding an inert filler after the surface cross-linking reaction to prepare the super absorbent resin finished product particles. The super absorbent resin disclosed by the invention has the characteristics of high reaction efficiency, high liquid absorption speed, good liquid passing performance, excellent reverse osmosis resistance and the like.

The invention provides a system and a method for producing high-purity electronic-grade carbonic ester, and the system comprises a heterogeneous reaction section, a separation section and a crystallization section along the material flow direction, the heterogeneous reaction section is used for carrying out heterogeneous reaction on ethylene oxide and carbon dioxide to prepare carbonic ester; the separation section is used for separating materials from the heterogeneous reaction section and comprises a flash evaporation unit and a rectification unit in the material flow direction, and the flash evaporation unit comprises at least one flash evaporation tank; the rectification unit comprises at least one rectification tower, and the side-draw of the rectification unit is communicated with the feed port of the crystallization section; and the crystallization section is used for crystallizing and purifying the material mainly containing carbonic ester from the separation section. According to the method, high-purity ethylene carbonate used as a power battery can be obtained from the crystallization section, and crystallization mother liquor can be selectively returned to the separation section to be concentrated. The method can effectively improve product purity, reduce product chromaticity and reduce energy consumption, and can be applied to industrial production of carbonic ester.

The utility model belongs to the technical field of sugar alcohol preparation, and relates to a system for co-producing L-arabinose and caramel pigment by using xylose chromatography raffinate, which comprises a raw material tank, a nanofiltration membrane separator, a chromatography separation device, an evaporation concentration tank, a crystallization tank, a centrifugal separator and a dryer which are sequentially communicated by pipelines, and the browning reaction assembly is used for mixing the raffinate and the centrifugal mother liquor and then carrying out browning reaction treatment to prepare caramel pigment. The chromatographic separation device is used for separating an extracting solution and raffinate from the flowing nanofiltration permeate, the evaporation concentration tank and the crystallizing tank are used for concentrating and crystallizing the flowing extracting solution into massecuite, the centrifugal separator is used for separating the flowing massecuite into moist sugar and centrifugal mother liquor, and the dryer is used for drying the flowing moist sugar into L-arabinose crystals. According to the utility model, raffinate and centrifugal mother liquor are mixed to prepare a caramel pigment liquid product, so that a caramel pigment additional product is obtained while the utilization rate of saccharide resources is improved.

The invention discloses a method for preparing superfine high-purity germanium dioxide from germanium tetrachloride. The method comprises the following steps: step 1, preparing a reactor; step 2, preparing hydrolysis mother liquor; step 3, hydrolysis; step 4, suction filtration and washing; step 5, drying; and step 6, screening. According to the method for preparing the superfine high-purity germanium dioxide, the production efficiency of the superfine high-purity germanium dioxide can be effectively improved, and the superfine high-purity germanium dioxide is efficiently prepared by controlling the hydrolysis ratio, the acidity of hydrolysate, the germanium content, the temperature of the whole hydrolysis process, the hydrolysis rate and the stirring power.

The invention discloses an integrated reaction process for preparing potassium fluoborate through efficient conversion of fluosilicic acid, and relates to the technical field of inorganic fluorine chemical industry, and the potassium fluoborate is prepared through the technologies of complexing metal impurities through EDTA disodium, catalyzing condensation reaction through Fe-TiO2, carrying out K2CO3 / nano gamma-Al2O3 composite desilicication, deeply removing sodium through ion exchange and carrying out mother liquor closed-loop circulation. The problems of serious sodium pollution, low reaction efficiency and resource waste in the traditional process are solved. The composite desiliconization agent improves the desiliconization rate to 96%, the reaction time is shortened by 40% through nanometer catalysis, the mother liquor recycling rate is 80%, and the silicon slag is converted into high-added-value nanometer white carbon black. The product purity is greater than or equal to 99.5%, the sodium residue is less than or equal to 0.003%, and the method is suitable for industrial production of electronic-grade potassium fluoborate.

The present invention discloses a preparation method of camptothecin derivatives. The present invention provides a preparation method of a compound of formula 7, which comprises the following steps: in an organic solvent, the compound of formula 6 is subjected to a deprotection reaction with methanesulfonic acid to obtain the compound of formula 7. The preparation method of the present invention uses a small amount of solvent during post-treatment, is easy to filter, the obtained product is off-white, the product purity and yield are higher, and it is suitable for industrial production. The recrystallization mother liquor obtained from the deprotection reaction is easier to recover, greatly reducing the raw material cost.

The invention belongs to the technical field of 4-BMA mother liquor recycling, and relates to a method for recycling 4-BMA in mother liquor by adopting a membrane treatment technology, which comprises the following steps: dropwise adding isopropylamine into 4-BMA refining wastewater, adjusting the pH value to 8-9, selecting a proper filter membrane, and filtering by using membrane filtering equipment at a certain temperature to obtain concentrated liquor and permeate liquid; the maximum separation effect is achieved by controlling the volume ratio of the permeate to the concentrated solution, and the 4-BMA isopropylamine salt concentrated solution is obtained; ethyl acetate is added into the 4-BMA isopropylamine salt concentrated solution for extraction, then 13.5 wt% hydrochloric acid is dropwise added for crystallization, and a 4-BMA product is obtained. According to different solubility of 4-BMA, isomer and isopropylamine after salification in water, the isomer salt is dissolved in water to be removed, 4-BMA salt with high purity is obtained, qualified 4-BMA with the purity larger than or equal to 98.00% is obtained through acid adjustment, and the purity of 4-BMA is larger than or equal to 98.00%. The method is low in energy consumption, simple in process, simpler to operate and easier to convert.