413 results about "Chemical separation" patented technology

The invention discloses a rectification mechanism and a carbon disulfide production system containing the same. The rectification mechanism comprises an integrated rectification tower, and an inner cavity of a shell of the integrated rectification tower is sequentially divided into a function-integrated pre-separation and sulfur removal area, a main rectification and hydrogen sulfide removal area and a condensation reflux area from bottom to top in the vertical direction; the pre-separation and sulfur removal area comprises a settling tank arranged at the lower part of the shell, a gathering cover arranged above the inner wall of the settling tank, and a gas rising pipe I arranged above the gathering cover; the invention belongs to the technical field of chemical separation, and achieves the technical effects that multi-stage functions of pre-separation, main rectification, precise purification, final condensation and the like are innovatively integrated in a single tower, so that the fundamental simplification and compactness of the equipment structure are realized; in the traditional process, separate coarse removal, fine removal and finished product towers are replaced by unique expanded settling tanks in the towers, filler layers of integrated plate heat exchangers, tower tops with spiral condensation channels and side-draw systems.

The invention relates to the technical field of chemical separation, in particular to a cyclohexanone rectification and purification method based on high-tower segmented packing, which comprises the following steps: step 1, filtering a cyclohexanone raw material containing impurities to remove solid particles, and dynamically adjusting the filtering precision according to the viscosity of the raw material; 2, arranging a bottom section, a middle section and a top section in the vertical high tower; the temperature gradient of each section is regulated and controlled through an independent temperature control unit, so that the temperature gradient of the middle section is matched with the relative volatility of the cyclohexanone-light component; 3, dynamically adjusting the reflux ratio based on the real-time detection result of the purity of the tower top distillate, and controlling an intermittent discharge valve according to the density change of the tower bottom heavy component enrichment liquid so as to continuously remove the heavy components; and 4, recycling the waste heat of the steam at the top of the tower for preheating the raw materials, and inhibiting the tower pressure fluctuation through a buffer tank. Through the innovative design of sectional packing of the high tower, the separation efficiency is improved, the energy consumption is reduced, and meanwhile, the equipment reliability is improved.

Disclosed herein are systems and embodiments for improving energy efficiency of a chemical separations plant through heat integration. Heat integration may provide heating loops between distillation columns and / or integrated electric heating components configured to supply heat to reboilers in the chemical separations plant. Heat integration may use heat from an associated chemical synthesis plant configured to carry out an exothermic reaction (e.g., production of methanol from CO2 and H2). Such integrated process designs allow for the use of “low-grade” heat, thereby improving energy efficiency. Furthermore, such integrated process designs allow for electrification of exemplary chemical separations plants, replacing the use of steam as a heating medium with more energy efficient and carbon-emission neutral, electrical methods.

The utility model relates to the technical field of chemical separation, and provides a dividing wall column and a rectification device.The dividing wall column comprises a column body, a partition plate, a first distributor and a first liquid collection tray, the partition plate is arranged in the column body and extends in the height direction of the column body, and the top face of the partition plate and the inner top wall of the column body are arranged at intervals in the height direction of the column body; the bottom surface of the partition plate and the inner bottom wall of the tower body are arranged at intervals; in the height direction intersecting with the tower body, one side wall face of the partition plate and a part of the inner wall of the tower body define a feeding section, the other side wall face of the partition plate and the other part of the tower body define a discharging section, the first distributor is arranged in the feeding section and connected with the tower body and the partition plate, and the first liquid collecting disc is arranged in the discharging section and connected with the tower body and the partition plate. According to the invention, the problems of high energy consumption and large occupied area when silicate ester is separated in a double-tower rectification mode can be solved.

The present invention belongs to the technical field of chemical separation and purification, and specifically relates to a method for removing impurities from a hydroxylamine aqueous solution. The method for removing impurities from a hydroxylamine aqueous solution provided by the present invention comprises the following steps: mixing a hydroxylamine aqueous solution and an alkaline compound for sedimentation and then performing solid-liquid separation to obtain a liquid phase; the alkaline compound comprises barium hydroxide or calcium hydroxide; the liquid phase is passed through an ion exchange column for ion exchange to obtain a purified hydroxylamine aqueous solution; the resin in the ion exchange column is a resin containing phenolic hydroxyl groups. The phenolic hydroxyl-containing resin used in the present invention is easy to obtain, has a wide range of sources, and has low cost. The present invention first uses an alkaline solution to remove sulfate or phosphate in a hydroxylamine aqueous solution, and then uses a phenolic hydroxyl-containing resin to efficiently, quickly, and conveniently remove metal ions in the hydroxylamine aqueous solution without reacting with hydroxylamine. The impurity removal method provided by the present invention has the advantages of simple operation and obvious purification effect, and has good industrial prospects.

The invention discloses a method for efficiently extracting phenol from coal tar and primarily separating crude phenol oil, and relates to the technical field of chemical separation. Carrying out multi-stage cross-flow or counter-flow extraction on the extracting agent and the coal tar to obtain a raffinate phase and a high-concentration extraction phase; and mixing the raffinate with condensate at the top of the regeneration device and supplemented fresh water, and recovering residual organic amine through a reverse extraction device to obtain a dephenolized oil product and backwashing water. Mixing and diluting the extract phase with backwashing water, and standing for phase splitting to obtain a high-grade crude phenol oil phase and a low-concentration extract phase; the low-concentration extraction phase absorbs CO2 in the industrial tail gas for acidification to obtain a low-grade crude phenol oil phase and an amine salt aqueous solution; and desorbing the amine salt aqueous solution to obtain a regenerated extraction agent (circularly used for extraction), tower top condensate (circularly used for reverse extraction) and water-containing industrial-grade CO2 gas (recycled or sealed after drying). According to the method, high-efficiency extraction of the phenolic compounds in the coal tar and primary separation of crude carbolic oil are realized by utilizing the extraction performance differences of extraction capacities, selectivity and the like of the extraction agents with different concentrations on the phenolic compounds, and the production economy is improved.

The present invention discloses a method for extracting phenolic compounds from coal tar in stages, which relates to the technical field of chemical separation. The method comprises the following steps: extractant II is mixed with coal tar through an extraction device to obtain coal tar I and extraction phase II; the extraction phase II is sequentially subjected to deep acidification with CO2 and oil-water separation to obtain a low-grade crude phenol oil product and aqueous phase II; the aqueous phase II enters a regeneration device for regeneration by heating, the obtained CO2 gas is recycled to the deep acidification device, and the regenerated extractant is mixed with supplemented fresh extractant to serve as extractant I. Extractant I is mixed with coal tar I through an extraction device to obtain extraction phase I and a dephenolized oil product; the extraction phase I is subjected to acidification and oil-water separation to obtain extractant II and a high-grade crude phenol oil. The present invention utilizes the selectivity difference of different extractants for different types of phenolic compounds in coal tar to realize the efficient extraction of phenolic compounds in coal tar and the preliminary separation of crude phenol oil, and significantly reduces the cost of subsequent treatment of dephenolized oil and crude phenol oil.

Described is a computer-implemented method for modeling an equilibrium separation in a chemical separator. The method can include representing a feedstock of the chemical separator as a collection of molecules, each molecule having a mole fraction. A cluster analysis is performed on the feedstock based on a property of the collection of molecules to generate thermodynamic lumps. A mapping identity table is generated that identifies each molecule of the collection of molecules in the feedstock. A simulation of a chemical separation of the thermodynamic lumps is performed. The mole fraction of molecules in a resultant first phase and the mole fraction of molecules in a resultant second phase is determined.

The invention belongs to the technical field of chemical separation, and relates to a bionic on-demand emulsion separation membrane which is formed by compounding a normal beetle wettability fiber layer and an anti-beetle wettability fiber layer, and the two layers form a stable laminated structure through mechanical entanglement of fibers, the thickness of the normal beetle wettability fiber layer and the thickness of the anti-beetle wettability fiber layer are both 0.2-500 micrometers, and the thickness ratio of the normal beetle wettability fiber layer to the anti-beetle wettability fiber layer is 1: 0.2-5. The invention also discloses a preparation method of the bionic on-demand emulsion separation membrane. According to the invention, bionic design and asymmetric wettability technology are utilized to realize high-efficiency treatment of oil-containing wastewater. The method has the advantages that the separation effect is improved by a bionic synergistic demulsification mechanism; multiple types of emulsions are efficiently separated, energy consumption is low, and external stimulation is not needed; the bionic synergistic demulsification mechanism based on positive beetle wettability and anti-beetle wettability is achieved, the separation effect is remarkably improved, the advantage of performance integration is achieved, and efficient on-demand separation of water-in-oil emulsion and oil-in-water emulsion through a single membrane material is achieved.

The invention relates to the technical field of chemical separation and purification, and discloses a method for separation and purification of taxadiene from tobacco and GC-MSMS quantitative detection.The method for separation and purification of taxadiene from tobacco comprises the following steps that S1, tobacco leaves are made into powder, an extracting agent is added, ultrasonic extraction is conducted for multiple times, and extract liquor is obtained; s2, evaporating the extract to dryness, adding an organic solvent, and dissolving to form a concentrated solution; s3, the concentrated solution is added into a silica gel column for gradient elution, and an extraction sample is obtained; and S4, evaporating the extracted sample to dryness, adding acetonitrile for dissolving, and carrying out secondary recrystallization to obtain purified taxadiene. According to the method, the efficiency and purity of separating the taxadiene from the tobacco are improved, and the taxadiene is accurately quantified.

The invention discloses a rare earth concentrate chemical separation wastewater treatment method, which comprises: 1) adding an alkaline agent I and a precipitate I into rare earth concentrate chemical separation wastewater, and carrying out a reaction to obtain lead slag and a lead-removed supernatant; (2) adding a calcium agent, an alkaline agent II and a flocculating agent into the lead-removed supernatant to react, so as to obtain fluorine residues and fluorine-removed supernatant; (3) electrolyzing the fluorine-removed supernate to obtain iron slag and iron-removed supernate; 4) adding phosphate and a precipitant II into the iron-removed supernate for reaction to obtain phosphate precipitate of rare earth elements and rare earth-removed supernate; 5) carrying out evaporation concentration on the rare earth-removed supernatant to obtain an evaporation concentrated solution; and cooling the evaporated concentrated solution, and carrying out solid-liquid separation to obtain a CaCl2. 2H2O crystal and a mother solution. The lead element, the fluorine element, the iron element, the rare earth element and the calcium element in the rare earth ore concentrate chemical separation wastewater can be directionally separated and recycled step by step, and cross interference among the elements is avoided.

A waste extraction system that includes a column set positioned between and fluidly coupled to an upstream segment of a main waste pathway and a column effluent tank, the column set having a uranium adsorption column fluidly coupled to a supporting adsorption column along the main waste pathway. The uranium adsorption column is upstream the supporting adsorption column. The waste extraction system also includes a strip waste pathway extending from the uranium adsorption column to the column effluent tank bypassing the supporting adsorption column, an anion exchange resin housed in the uranium adsorption column, and a cation exchange resin housed in the supporting adsorption column.

Embodiments relate to processing materials in recycling of used solar panels. A used solar panel may comprise components manufactured from materials of high purity, that are expensive to prepare from scratch. Examples of such high purity materials can include but are not limited to: metals (silver; copper; tin; lead), photovoltaic material (e.g., precisely doped crystalline silicon; CdTe), and optically transparent materials (e.g., optical glass; plastics). Accordingly, embodiments recover one or more high purity materials from a starting material pre-processed from a used solar module, by using a recycling process comprising multiple successive separation events. Such events can include, but are not limited to: chemical separation (leaching, filtration, precipitation), physical separation (e.g., shredding / sieving), thermal separation (e.g., furnace heating), and / or electrical separation (e.g., electrowinning, electrostatic). Various fractions separated during the recycling process flow, are enriched in valuable materials and hence available for reuse at lower cost relative to materials prepared from scratch.

The application discloses a kind of metal organic framework materials and preparation method and application thereof, belong to chemical separation technical field.The preparation method of metal organic framework material provided in the application includes the following steps: with water and methanol as solvent, with 4,4 '-dipyridyl and malic acid as organic ligand, zinc source is added, and reaction is carried out, in the reaction process, oxygen atom on malic acid is connected with zinc ion on zinc source to form 2D layered network structure, 2D layered network structure is bridged by 4,4 '-dipyridyl to form 3D rigid network framework, after reaction, metal organic framework material is prepared.The metal organic framework prepared by the application has super strong capture effect and large storage space for acetylene molecules, and also has excellent separation effect on acetylene carbon dioxide mixed system, to achieve the purpose of high-purity, high-yield acetylene purification in acetylene carbon dioxide mixture.

The application discloses a kind of equipment for detecting tritium in groundwater of monitoring well of nuclear power plant, including electric deionization device, collection water tank, switching valve, measuring chamber, dosing mechanism and first waste liquid tank, the electric deionization device is communicated between the monitoring well and collection water tank, the switching valve is arranged between the collection water tank and measuring chamber, the dosing mechanism is communicated with the switching valve, for dosing in the measuring chamber, the electric deionization device and switching valve are all communicated with the first waste liquid tank, direct connecting pipeline is also provided between the electric deionization device and switching valve directly connected.The equipment for detecting tritium in groundwater of the present application can quickly purify water body by setting electric deionization device, and the collected purified water can be directly sent into measuring chamber for detection;Chemical separation and sample measurement are integrated in one device, which can process and detect more samples in a shorter time, greatly shortening the processing time and process.

The invention relates to the technical field of chemical separation equipment, in particular to a graded pore foamed ceramic filler, a separation tower and a preparation method. The invention provides a separation tower, grade hole foam filler is used, the filler is prepared through a 3D printing process, the separation tower comprises a filler body, and the filler body is provided with fine holes and coarse holes; the aperture ratio of the thick holes to the thin holes is 2-5, and the volume ratio of the thin holes to the thick holes is 0.3-0.6. The invention aims to solve the technical problem that the flux and the mass transfer area cannot be balanced by a single aperture in the prior art.

The invention discloses an MDEA solution thermal regeneration and hydrogen sulfide analysis system and process method, and belongs to the technical field of gas purification and chemical separation. The system comprises a regeneration tower, a kettle type reboiler, a condensate tank and a gas phase balance pipeline, an oil collector is arranged at the bottom of the regeneration tower, and the shell pass liquid level of a kettle type reboiler is controlled by LT2 to be always higher than the top of a heat exchange tube bundle, so that full-immersion corrosion prevention is realized; steam condensate enters the condensate tank through the first condensate outlet pipeline, and the pressure in the condensate tank is synchronous with that of the steam inlet pipeline through the gas phase balance pipeline, so that the condensate is automatically discharged without a pump; and when the gas phase outlet temperature TE2 is smaller than or equal to 125 DEG C and the steam pressure PT1 after pressure reduction is larger than 0.4 MPa, steam is cut off in an interlocking mode, and MDEA thermal decomposition is prevented. The service life, the operation safety and the operation reliability of equipment are remarkably improved.

The invention relates to the technical field of chemical separation, and discloses crystal separation equipment and a crystal separation method for preparing electronic-grade dimethyl carbonate.The crystal separation equipment comprises a supporting frame, a conveying belt is arranged on the supporting frame, a liquid injection device is arranged on one side of the supporting frame, and a crystallization device is arranged on the other side of the supporting frame; a plurality of fixing plates are arranged on the conveying belt, the fixing plates are rotationally connected with limiting plates, the limiting plates are fixedly connected with flasks, fixing columns are fixedly connected to the lower portions of the flasks, the other ends of the fixing columns are fixedly connected with round pipes, and the other ends of the round pipes are slidably connected with sliding round clamping blocks. According to the crystallization separation equipment and the crystallization separation method for preparing the electronic-grade dimethyl carbonate, the flask can be shaken in the crystallization process, so that the contact area of a stock solution in the flask and the flask can be increased, the stock solution can be cooled more uniformly, and meanwhile, the stock solution is crystallized more uniformly.

The present application belongs to the technical field of water treatment, and relates to a heat-sensitive color developing agent F-103 production wastewater treatment method. The present application performs multistage treatment on the wastewater. First, an alkaline chemical separation reaction is performed on the wastewater to remove part of the acidic polar organic matter 3-p-tolylsulfonylureido phenol, p-toluenesulfonic acid and the like in the water. Then, an acid chemical separation reaction is performed to further remove the alkaline polar organic matter intermediate MAPOTs and the like in the water. Subsequently, an adsorption reaction is performed using activated carbon to further remove the organic matter and inorganic impurities in the water. Finally, evaporation and concentration are performed to recover the salt sodium chloride. The wastewater treatment of the present application recovers the salt sodium chloride in the wastewater as a resource under the premise of solving the toxicity problem of the organic matter in the wastewater, and realizes the harmless treatment and the reduction of hazardous waste of the wastewater.

The application discloses a kind of high olefin dry dehydration bed regeneration and cryogenic recovery process, belong to chemical separation and purification technical field, the process includes six steps of bed emptying, cold inert medium purging, heating desorption, staged cryogenic condensation recovery, bed cooling, pressure charging standby in sequence, maximum recovery free olefin by pre-emptying and purging step, inhibit high temperature polymerization, core uses staged cryogenic condensation recovery process to olefin component in desorption gas is condensed and recovered gradually, the loss problem of olefin material direct discharge flare in traditional process is solved, effectively inhibit olefin polymerization, by pre-cold inert medium purging step, remove the free olefin remaining in bed, cooperate with desorption temperature control and oxygen-free inert atmosphere throughout, avoid the occurrence of olefin polymerization reaction under high temperature condition, prevent the damage of green oil generation to adsorbent and equipment.

The invention discloses a method for adsorbing and separating high-purity gas, which belongs to the technical field of chemical separation and comprises the following steps of: separating and purifying mixed gas or isotope by using an adsorption separation medium; the adsorption separation medium is a microporous metal organic framework material which is thermally synthesized from divalent metal salt and a ligand 1, 5-dihydrobenzo [1, 2-d: 4, 5-d '] bis ([1, 2, 3] triazole) through a solvent. The microporous metal organic framework material has a uniformly distributed microporous structure, a high specific surface area and excellent thermal stability and chemical stability, and high-selectivity separation of rare gas xenon / krypton, methane / propane / ethane, propylene / ethylene, ethane / ethylene and xenon isotopes can be realized through pressure swing / temperature swing adsorption; the adsorbent has ultrahigh adsorption and storage capacity for xenon, propane, propylene and ethane, and high-purity (greater than or equal to 99.99%) xenon, krypton, methane, ethylene and ethane and high-purity isotopes of 129Xe and 131Xe can be obtained after separation.

The application discloses an adsorbent for removing trace metal ions in alcohol ether solvents and a preparation method and application thereof, and belongs to the field of chemical separation technology. The adsorbent is a zirconium-based metal organic cage material with discrete structure formed by coordination self-assembly of a zirconium metal salt and a nitrogen-containing polycarboxylic acid organic ligand. The adsorbent has specific ion nanowells, and can form a strong limited synergistic effect with metal ions. The adsorbent is suitable for adsorption and separation of trace metal ions in various alcohol ether solvents, and has high metal ion adsorption and removal efficiency.

The application belongs to the technical field of chemical separation materials, and relates to a preparation method of a sulfonated polythiophene modified nitrogen-doped honeycomb carbon and Co9S8 composite microsphere integrated flow electrode, which comprises the following steps: taking chitosan as a carbon source and a nitrogen source, adding a cobalt source and a sulfur source, performing cross-linking aging, forming and curing, performing freeze drying and high-temperature carbonization, and obtaining chitosan derived nitrogen-doped honeycomb carbon and Co9S8 composite microspheres; taking thiophene and 3-sulfonic acid thiophene as monomers, coating a sulfonated polythiophene film on the surface of the composite microspheres through chemical polymerization, and obtaining the integrated flow electrode. The high specific capacitance electrode material and the conductive ion exchange membrane function are combined into one, the specific capacitance, the hydrophilicity and the ion selective permeability are significantly improved, the integrated flow electrode is used for deionization technology treatment of uranium-containing wastewater, the uranium removal rate is high, the electric adsorption capacity is large, the balance time is short, the device is simplified, and the application prospect is wide.

The invention relates to the technical field of chemical separation, in particular to a three-dimensional flexible metal organic framework material and a preparation method and application thereof. The structural general formula of the metal organic framework material is A (TIB) 2, A is a transition metal cation, and TIB is 1, 3, 5-tri (1H-imidazole-1-yl) benzene. Transition metal cations and TIB are self-assembled in an octahedral hexa-coordination mode to form a two-dimensional layered frame, and the two-dimensional layered frame is further stacked to form a three-dimensional flexible structure. The material has a two-dimensional layered skeleton with high stability and a pore surface with a partial electrostatic potential, not only shows a strong capture capability on carbon dioxide, but also provides a suitable storage space for acetylene, can selectively adsorb and separate an acetylene / carbon dioxide / ethylene mixed system, and realizes one-step purification of ethylene from a ternary mixture. In addition, due to excellent cyclic regeneration performance, solvent stability and thermal stability, the adsorbent is expected to be an efficient adsorbent applied to industrial adsorption separation.

The invention discloses a hydrosolvent distillation, compression and separation device, which belongs to the technical field of chemical separation and comprises a reaction kettle, a gas-liquid separator, a low-pressure balance tank, a high-pressure balance tank, a low-pressure steam purification filter, a steam compressor, a steam boiler, an electric cabinet and a condensed water heat recoverer. The steam compressor sucks steam of a water solvent, reduces pressure in the reaction kettle and promotes evaporation of the water solvent in the reaction kettle, the steam compressor compresses the steam of the water solvent into high-temperature and high-pressure steam to enter a heating layer of the reaction kettle, and extract and a solvent in the reaction kettle are condensed into liquid to flow out while being heated; the energy consumption of the device is 20% of the energy consumption of a distillation cooling device, and compared with the distillation cooling device, the energy consumption can be reduced by 80%.

The invention discloses a vertical gas-liquid two-phase fluid uniform distribution device and a uniform distribution method thereof, and relates to the technical field of chemical separation equipment. The device comprises a device shell, a cyclone flow guide mechanism, a multi-stage reducing flow guide mechanism and an umbrella-shaped reflecting and converging mechanism, the cyclone flow guide mechanism, the multi-stage reducing flow guide mechanism and the umbrella-shaped reflecting and converging mechanism are sequentially fixed in the device shell from top to bottom, and the multi-stage reducing flow guide mechanism comprises a first-stage distribution plate, a second-stage distribution plate and a third-stage distribution plate; first-stage distribution holes are uniformly distributed in the first-stage distribution plate, second-stage distribution holes are uniformly distributed in the second-stage distribution plate, third-stage distribution holes are uniformly distributed in the third-stage distribution plate, a mounting groove is formed in the bottom of each third-stage distribution hole, and a valve element assembly is fixed in each mounting groove. Through the multi-stage synergistic effect, the technical problems that an existing distributor is insufficient in radial mixing, poor in operation elasticity, prone to blockage, serious in wall flow phenomenon and the like are effectively solved, and efficient, stable and uniform distribution under all working conditions is achieved.

A method of forming a high internal phase emulsion (HIPE) foam is provided. A nitroxide-containing monomer can be used in combination with other monomers that can then be used to make a high internal phase emulsion foam upon curing. The nitroxide group can subsequently be used to control the radical polymerization of many monomers, which can be grafted from the surface of the high internal phase emulsion foam. The resulting foam can be useful in performing separations of radioactive species, metals, metal ions, multi-element ions, metal complexes, halides, and organic chemical species in chemical process streams, clean-up operations, etc.

A system and method for chemical process simulation integrates thermodynamic models into machine learning frameworks to enhance predictive accuracy and optimize chemical separation processes. The system employs a variety of methods, such as using a physics- informed neural network (PINN)-like approach and methods that embed thermodynamic equations directly into the architecture, ensuring adherence to physical laws such as conservation of energy and mass. Additionally, experimental data, virtual sampling points derived from thermodynamic models, and auxiliary predictions capturing interdependencies between physical and chemical variables are combined into an augmented dataset for training. A hybrid loss function balances contributions from experimental data and thermodynamic insights, dynamically adjusted via a scaling hyperparameter. The system predicts target properties, such as adsorption efficiency, under diverse operating conditions while maintaining compliance with thermodynamic constraints.

The utility model relates to chemical separation technical field, concretely is a kind of kettle type distillation device, it includes kettle body, T groove and bolt, the top of kettle body is detachably connected with kettle cover, the inner chamber of kettle body is provided with heating cavity, the top of kettle cover is fixedly installed with motor, the output of motor is fixedly connected with stirring rod, the outside of stirring vane is provided with dismounting mechanism, and the inner chamber of dismounting mechanism is provided with heating mechanism, T groove, sliding slot, sliding base, spring, screw hole, jack, connecting piece, insert block, T piece and collar, the kettle type distillation device, by setting dismounting mechanism, it is detachable connection structure between stirring vane and stirring rod, to facilitate the separate dismounting and cleaning of stirring vane, by setting heating mechanism, electric heating tube and heat conduction plate cooperate to heat stirring vane, then the stirring vane of rotation and heated state effectively improves the heating uniformity when material to be distilled is stirred.

The utility model relates to the technical field of chemical separation, in particular to a dual-purpose extractive distillation tower for separating acetic acid from water, which comprises an extraction tower, a condenser I, a condenser II and a reboiler, an extraction chamber, a distillation chamber and a circulation chamber are arranged in the extraction tower, the distillation chamber and the extraction chamber are symmetrically arranged, and the circulation chamber is positioned below the distillation chamber and the extraction chamber. The first condenser and the second condenser are located above the extraction tower, the first condenser is communicated with the extraction chamber, the second condenser is communicated with the rectification chamber, and by integrating the two functions of extraction and rectification, the tower achieves effective separation of acetic acid and water. The layered contact design ensures that the acetic acid raw material and the composite extraction agent are in full contact but not directly mixed between filler layers, the mass and heat transfer process is optimized, the extraction agent can be recycled after being treated by the rectification chamber, and the resource waste is remarkably reduced. And due to the recycling design, the operation cost is reduced, and the consumption of the extracting agent is reduced.