245 results about "Extractive distillation" patented technology

The invention discloses a continuous synthesis and purification method of hexafluoropropylene oxide, which comprises the following steps: introducing hexafluoropropylene, oxygen and a fluorine-containing solvent into a supergravity reactor to carry out oxidation reaction at the reaction temperature of 100-200 DEG C under the reaction pressure of 1.0-2.5 Mpa for 10-120 seconds, and after the reaction is finished, overflowing and leading out reaction liquid to obtain the hexafluoropropylene oxide. And purifying to obtain the hexafluoropropylene oxide. According to the method, the problems of mass transfer and heat transfer can be effectively solved by using the supergravity reactor, the reaction selectivity is remarkably improved, meanwhile, the productivity is effectively improved, and the supergravity reactor is combined with extractive distillation treatment, so that the conversion rate of the hexafluoropropylene reaches 79% or above, the selectivity of the hexafluoropropylene oxide is 85% or above, and the purity of the hexafluoropropylene oxide after extractive distillation reaches 99%. The invention further discloses a device used in the continuous synthesis and purification method, and cyclic utilization of hexafluoropropylene and the fluorine-containing solvent can be achieved.

The invention discloses a separation method of a phenol-cyclohexanone azeotropic system, a separation system and application. The separation method comprises the following steps: separating a material containing phenol, cyclohexanone and impurities and a material containing an extraction agent in an extractive distillation tower, and extracting the material containing cyclohexanone from the tower top; extracting a material containing phenol, impurities and an extracting agent from the tower kettle; the impurities comprise at least one of cyclohexylbenzene, ketal and a ketal dehydration product; feeding the material containing phenol, impurities and the extraction agent into a solvent recovery tower for separation, and extracting the material containing phenol from the tower top; a material containing the extraction agent and impurities is extracted from the side line of the tower and is cooled and separated by a phase splitter to obtain a light-phase material containing the impurities and a heavy-phase material containing the extraction agent; the heavy-phase material containing the extraction agent flows back to the solvent recovery tower and then flows back to the extractive distillation tower, so that recycling of the extraction agent is realized, the investment economic cost of the extraction agent is effectively saved, and the condition that the extraction agent needs to be regularly discharged as fuel or post-treated in the prior art is avoided.

The invention discloses a binder-free granular carbon molecular sieve and application thereof in C4 olefin mixture separation, and belongs to the technical field of C4 olefin adsorption and separation. The granular carbon molecular sieve for C4 olefin mixture component separation is obtained by crushing a precursor, screening particles with a proper particle size as a carbon source, and then performing carbonization and pyrolysis in a tubular furnace. The granular carbon molecular sieve disclosed by the invention is high in adsorption capacity, high in selectivity, good in stability, high in particle strength and easy to recycle and regenerate, and can be directly used for industrial devices. Compared with the traditional solvent absorption, extractive distillation and low-temperature distillation technologies, the separation method provided by the invention has the advantages of low energy consumption, small equipment investment, environmental friendliness and the like, and has a wide application prospect in the field of C4 olefin component separation.

The invention provides a method for extracting, rectifying and separating an ethano-2-pentanone azeotropic system by using a tetramethylammonium chloride eutectic solvent, and relates to the technical field of extracting, rectifying and separating the ethano-2-pentanone azeotropic system, which comprises the following steps: taking an ethano-2-pentanone mixture as a raw material to be separated; the method comprises the following steps: mixing and stirring a hydrogen bond acceptor and a hydrogen bond donor according to a certain proportion and temperature to obtain the eutectic solvent, firstly heating a material S01 to be separated by a heat exchanger E101 and then entering the middle part of a T101 tower, adjusting a eutectic solvent material flow S02 to a proper temperature and then entering the upper part of the T101 tower, carrying out heat exchange on a tower top ethanol material flow S03, enabling a part of material flow S05 to flow back to the tower top, and carrying out heat exchange on a tower top ethanol material flow S03; according to the method, a specific eutectic solvent is adopted as an extracting agent, an extractive distillation process is matched, an ethano-2-pentanone azeotropic system can be effectively broken, the yields of ethanol and 2-pentanone can reach 99% or above finally, the purities of ethanol and 2-pentanone can reach 99.5% (mass percent) or above finally, and efficient separation is achieved.

The invention relates to a method for recovering nickel and cobalt from a mixture of compounds of these metals from the recycling of spent lithium-ion batteries, comprising the following steps: a) digestion of a mixture of nickel and cobalt compounds in a solution containing hydrochloric acid having a concentration of more than 25 mass %, in case the mixture of nickel and cobalt compounds is solid; or bringing the mixture of nickel and cobalt compounds to a hydrochloric acid concentration of more than 25 mass %, in case the mixture of nickel and cobalt compounds is a solution; b) activation of ion-exchange resin in a column using hydrochloric acid; c) passing the solution from step a) through the column filled with the ion-exchange resin activated in step b); d) washing the column with hydrochloric acid having a concentration of more than 25 mass % in order to wash out the remaining solution containing nickel ions; e) washing the column with hydrochloric acid having a concentration of less than 10 mass % in order to wash out cobalt ions; f) extraction distillation of the nickel ion solution obtained in step d) in hydrochloric acid using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; dissolution of nickel sulfate(VI) and electrolysis in order to recover metallic nickel; g) extraction distillation of the cobalt ion solution obtained in step e) in hydrochloric acid using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; dissolution of cobalt sulfate(VI) and electrolysis in order to recover metallic cobalt; h) extraction distillation of the solution of diluted hydrochloric acid with nickel and cobalt ions obtained after the activation of the ion-exchange resin in step b), using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; recycling of a mixture of the formed cobalt sulfate(VI) and nickel sulfate(VI) to digestion in step a); i) rectification of diluted hydrochloric acid having a concentration below the azeotropic concentration (approx. 20.2 mass % at atmospheric pressure) formed in extraction distillation processes in steps f)-h) in order to concentrate hydrochloric acid and recover and recycle of water; recycling of concentrated hydrochloric acid to extraction distillation in steps f)-h).

Inhibitor compositions for abating undesirable emulsion polymerization during processing of hydrocarbon stream laden with reactive vinylic monomers are provided. The polymerization inhibitor compositions include at least a first inhibitor compound having a stable nitroxide radical and a second inhibitor including phenylenediamine. Methods of inhibiting the polymerization of monomers using the compositions of the disclosure are also provided. The methods of inhibiting polymerization of monomers include a step of adding a composition of the disclosure to a process stream. The process stream includes an ethylenically unsaturated monomer that is suspended in the bulk-phase and highly polar solvents as distractive distillation solvents.

The utility model discloses a separation device for ethyl acetate and cyclohexane, which belongs to the technical field of separation and purification, solves the problems of incapability of large-scale separation, high process difficulty and poor separation effect in the prior art, and comprises an extractive distillation tower, the upper part is provided with a polyol solvent inlet, the top is connected with a first condenser, the outlet of the first condenser is connected with a cyclohexane outlet on the other side of the upper part of the extractive distillation tower, and the cyclohexane outlet is connected with a re-separation device. According to the device disclosed by the utility model, the problem of azeotropy of ethyl acetate and cyclohexane is solved by adding polar polyol, the relative volatility of the ethyl acetate and the cyclohexane is changed, and large-scale efficient separation of a mixture of the ethyl acetate and the cyclohexane is realized; the dissolubility of cyclohexane, sodium acetate and ethanol in water is different, so that the separation effect of cyclohexane is further improved, and the whole device is simple in structure.

The invention relates to the technical field of extractive distillation, in particular to a plant essence extractive distillation method, device and system, and the method comprises the following steps: acquiring temperature data, pressure data and flow data; acquiring average temperature data at each moment, respectively recording the average temperature data, the pressure data and the flow data as related data, and acquiring oscillation degree values of various related data in the monitoring time period; respectively acquiring a first influence coefficient and a second influence coefficient of the monitoring time period; acquiring a coupling disturbance index in the current monitoring time period; acquiring an unbalance coefficient of temperature distribution in the current monitoring time period according to the temperature data at each moment; and the rectification abnormal coefficient of the current monitoring time period is obtained by combining the coupling disturbance index in the current monitoring time period, so that the prediction range parameter in the model prediction control technology in the next monitoring time period is obtained, and the reflux quantity of the next monitoring time period is adjusted. According to the method, the extractive distillation purity of the plant extract is improved by optimizing the prediction range parameters.

The invention relates to the technical field of separation and purification, in particular to a method and a device for separating and purifying aromatic hydrocarbon, alkane and olefin, and the method combines liquid-liquid extraction and extractive distillation (namely, first extractive distillation and second extractive distillation), so that the liquid-liquid extraction and the extractive distillation are operated in respective dominant zones. In liquid-liquid extraction, heavy alkanes with small solubility are separated, light alkanes with high relative volatility are separated in first extractive distillation, olefins with high relative volatility are separated in second extractive distillation, aromatic hydrocarbons and solvents are separated in solvent recovery, and finally, the same solvent is used to realize efficient separation of aromatic hydrocarbons, alkanes and olefins.

The invention relates to an extractive distillation device and a waste liquid recovery method. The extractive distillation device comprises an evaporator, a primary tower, an impurity removal tower, an extractive distillation tower and a product recovery tower which are sequentially communicated through pipelines; the evaporator is provided with a raw material inlet, a first liquid phase inlet, a first liquid phase outlet, a first gas phase outlet, a first steam inlet and a first steam condensate outlet, and the primary distillation tower is provided with a primary distillation gas phase inlet and a primary distillation liquid phase outlet; the first gas phase outlet is communicated with the primary distillation gas phase inlet through a pipeline, the first liquid phase inlet is communicated with the primary distillation liquid phase outlet through a pipeline, and the first liquid phase outlet is used for flowing out impurities. According to the device and the recovery method, MDG and NMF in the waste liquid are further separated by adopting the extraction agent, MDG and NMF products can be respectively recovered, and thus the industrial utilization value of the MDG and NMF mixture is expanded.

The invention discloses a bamboo activated carbon production tail gas utilization method and a bamboo activated carbon production method.The utilization method comprises the following steps that production tail gas is subjected to condensation treatment, and condensate is obtained; carrying out solid-liquid separation treatment on the condensate to obtain permeate; performing extraction treatment on the permeate liquid by adopting an extraction agent to obtain a first extraction agent soluble liquid; carrying out reduced pressure distillation treatment on the first extractant soluble liquid to obtain distillate; performing extraction treatment on the distillate by adopting an extraction agent and water to obtain a second extraction agent soluble liquid; and carrying out reduced pressure distillation treatment on the second extractant soluble liquid to obtain the biomass oil. Through condensation treatment, solid-liquid separation treatment and two-stage extraction-distillation treatment, organic matter steam in carbonized tail gas is converted into biomass oil with a high calorific value (HHV), the overall additional value of bamboo activated carbon is increased, energy and chemical components of bamboo raw materials are utilized to the maximum extent, resource waste is reduced, and economic benefits of enterprises are increased.

The present invention discloses a low-odor phosphazene catalyst and its use. The catalyst comprises a phosphazene cation represented by the general formula (I) and an alkali metal salt compound anion. The catalyst is prepared by dissolving a phosphorus pentahalide and a guanidine compound in a non-benzene-based organic solvent and reacting them under heated conditions to obtain an organic phosphonium salt solution containing the organic solvent and the phosphorus halide compound. An alkali metal salt compound is then added and reacted under heated conditions in an inert atmosphere to obtain a purified phosphazene catalyst through filtration, reduced-pressure distillation, purification, and vacuum drying. The catalyst can be used in the production of polyether polyols and polyurethane foams. The phosphazene catalyst of the present invention employs a non-benzene-based inert solvent that does not participate in the reaction during production, eliminating the need for frequent solvent changes. Using the same solvent eliminates steps such as extraction and distillation, reducing energy consumption and wastewater generation during the process. The continuous production method for the phosphazene catalyst is efficient and environmentally friendly.

The invention discloses a method for separating a tert-amyl methyl ether-methanol-water azeotropic system by pressure swing extractive distillation through two different mixed entrainers on the basis of a heat pump technical process strengthening scheme. Through three-tower operation of an extraction vacuum distillation tower T1, an extraction vacuum distillation tower T2 and a solvent recovery tower T3, a methyl tert-amyl ether-methanol-water azeotropic mixed solution is separated, the purity of separated methyl tert-amyl ether is greater than 99.9%, the purity of methanol is greater than 99.9%, the yield is greater than 99.9%, the purity of water is greater than 99.9%, and the yield is greater than 99.9%. A heat pump technology is used as an effective process strengthening means, steam at the top of an extraction decompression rectifying tower T1 circularly enters a compressor to be compressed and heated through the compressor, the compressed steam serves as heat flow to heat cold flow at the bottom of the tower, and the top flow is finally condensed after heat transfer. And the reboiling flow at the bottom of the tower can reach the required reboiling ratio, so that the heat load consumption of the T1 tower is obviously reduced. By applying the method, the process cost and the environmental pollution can be further reduced, and the annual total cost and the gas emission are respectively reduced by 9.19% and 23.55%. According to the process, heat energy is fully utilized, energy consumption is reduced, the purity and the yield of the tert-amyl methyl ether are improved, and the equipment cost is reduced. The adopted mixed entrainer is small in dosage, relatively weak in volatility, small in extraction agent loss, easy to recover and environment-friendly.

The invention discloses a recovery method and application of ethylene glycol dimethyl ether, and belongs to the technical field of solvent recovery, and the recovery method comprises the following steps: mixing and stirring a recovery solvent and water, and standing for layering to obtain a lower water layer; distilling the water layer to obtain a distillation solvent; adding a dehydrating agent into the distillation solvent, stirring, and standing for layering to obtain supernatant liquid; and adding sodium filaments into the clear liquid for reaction, distilling and recovering ethylene glycol dimethyl ether. In conclusion, according to the recovery method and application of ethylene glycol dimethyl ether, through multi-step cooperative operation of extraction, distillation-alkaline dehydration and removal of tert-butyl alcohol from sodium filaments, accurate removal of impurities is achieved, the purity of solvent recovery in production of tert-butyl compounds is guaranteed, multiple targets of resource circulation, cost reduction and environmental protection standard reaching are achieved, and the recovery method and application of ethylene glycol dimethyl ether are suitable for industrial production. And a feasible technical scheme is provided for industrial sustainable production of the tert-butyl compound.

The invention discloses a device and a process method for separating n-hexane, acetone and chloroform by applying an extractive distillation technology to a dividing wall column, and relates to the technical field of chemical processes. The device comprises two parts: one part is an extractive distillation dividing wall tower, and the other part is a solvent recovery tower. According to the technical innovation, two extractive distillation towers in a conventional three-tower extractive distillation process are coupled into one dividing wall tower by utilizing a dividing wall tower technology, so that the dividing wall tower can be used for helping to industrially separate high-purity n-hexane, acetone and chloroform, meanwhile, the use cost of equipment is reduced, the use amount of circulating water and system heat energy is reduced, and the energy consumption is greatly reduced; and as the practicability and the economic benefit are remarkable, the method has a wide application prospect.

The invention relates to the technical field of neodecanoic acid preparation, and provides a high-purity neodecanoic acid preparation method which comprises the following steps: S1, adding a catalyst into a high-pressure kettle, introducing CO, injecting nonene, and reacting to obtain a reaction solution; s2, mixing the reaction liquid with an extraction agent, feeding the mixture into an extractive distillation tower, and performing extraction and separation to obtain a first organic phase; s3, adding water into the first organic phase, washing and separating to obtain a second organic phase; s4, adding an alkaline additive into the second organic phase, layering to obtain an upper-layer organic phase, and carrying out reduced pressure distillation on the upper-layer organic phase to obtain neodecanoic acid; in the step S1, the raw materials of the catalyst comprise supported cobalt oxide and concentrated sulfuric acid; the supported cobaltous oxide is prepared from the following raw materials: water-soluble cobalt salt and boron nitride; in the step S2, the extraction agent comprises 1, 2-propylene glycol. According to the technical scheme, the problem of low purity of neodecanoic acid in related technologies is solved.

The invention relates to a method for separating an n-propyl formate-n-propyl alcohol-water mixture by liquid-liquid phase separation coupling extractive distillation, which comprises the following steps of: dividing a raw material into a water phase and an organic phase by using a phase splitter based on the heterogeneous characteristic of an azeotropic system, and carrying out four-tower operation on a rectifying tower (C1), a rectifying tower (C2), a rectifying tower (C3) and a rectifying tower (C4) to obtain an n-propyl formate-n-propyl alcohol-water mixture. The efficient separation of the n-propyl formate-n-propyl alcohol-water mixture is realized. After separation, the molar fraction of n-propyl formate is greater than 99.99%, the molar fraction of n-propyl alcohol is greater than 99.99%, and the molar fraction of water is greater than 99.99%. The method provided by the invention realizes high-efficiency and low-energy-consumption separation of the n-propyl formate-n-propanol-water azeotropic mixture, and has economic benefits and environmental friendliness.

The invention relates to the technical field of chemical separation, and discloses an efficient tetrafluoropropanol separation method which comprises the following steps: S1, mixing an aqueous solution containing tetrafluoropropanol with a green extractant hydroxyethyl glucosamide according to a mass ratio of 1: 0.5-1: 2, and stirring at 25-40 DEG C for 20-40 minutes to form a uniform mixed solution; s2, inputting the mixed solution obtained in the step S1 into an extractive distillation tower, collecting water vapor at the top of the tower, and obtaining a mixture of tetrafluoropropanol and the green extractant at the bottom of the tower; s3, the tower bottom mixture obtained in the step S2 is cooled to 30-50 DEG C, deionized water is added for layering, the upper layer is high-purity tetrafluoropropanol, and the lower layer is an aqueous solution containing a green extraction agent; and S4, recycling the green extraction agent. According to the method, hydroxyethyl glucosamide is used as a green extracting agent, and an extractive distillation process is combined, so that an azeotropic system of tetrafluoropropanol and water is effectively broken, and the purity of the separated TFP reaches 99.5%-99.9%.

The invention relates to a method for separating cyclopentyl hexyl methyl ether, cyclopentene and methanol through three-tower extractive distillation. According to the method, an extractive distillation process is adopted, and two extractive distillation towers and a solvent recovery tower are adopted. An organic solvent is used as an extraction agent, cyclopentyl hexyl methyl ether, cyclopentene and methanol firstly enter an extractive distillation tower (EDC1) for extraction separation, high-purity cyclopentene is obtained at the top of the extractive distillation tower (EDC1), materials at the bottom of the extractive distillation tower (EDC1) enter an extractive distillation tower (EDC2) for separation, and high-purity methanol is obtained at the top of the extractive distillation tower (EDC1). Materials at the tower bottom of the extractive distillation tower (EDC2) enter a solvent recovery tower (SRC), high-purity cyclopentyl hexyl methyl ether is obtained at the top of the solvent recovery tower (SRC), and an organic solvent extraction agent is obtained at the bottom of the solvent recovery tower (SRC). The method has the advantages of low energy consumption, simple process, greenness, energy conservation, high product purity after separation and the like, and the adopted organic solvent extraction agent is good in stability, non-toxic and environment-friendly.

A process includes providing a composition including E-1,2-difluoroethylene (HFO-E-1132), and Z-1,2-difluoroethylene (HFO-Z-1132), and separating the HFO-Z-1132 from the HFO-E-1132 by a separation process selected from extractive distillation of the composition, chemical absorption of the HFO-Z-1132 in the composition, and chemical reaction of the HFO-Z-1132 in the composition to provide a purified composition comprising the HFO-E-1132 and being free of or substantially free of HFO-Z-1132. In another aspect, the process includes distilling the HFO-E / Z-1132 composition to provide a first fraction including HFO-E-1132 and free of or substantially free of HFO-Z-1132 and a second fraction including a major amount of HFO-Z-1132 and a minor amount of HFO-E-1132, collecting the first fraction as a purified composition, converting the second fraction to 1,1,2-trifluoroethane, 1,2-dibromo-1,2-difluoroethane or 1,2-dichloro-1,2-difluoroethane, converting the 1,1,2-trifluoroethane, 1,2-dibromo-1,2-difluoroethane or 1,2-dichloro-1,2-difluoroethane to HFO-E / Z-1132, and recycling the HFO-E / Z-1132 for distillation.

The invention provides a method and a system for purifying 4-hydroxybutyl acrylate based on film evaporation coupled extractive distillation, a reaction solution obtained after esterification reaction of acrylic acid and 1, 4-butanediol is subjected to film evaporation to obtain light component acrylic acid and concentrated solution, and the concentrated solution comprises 1, 4-butanediol, 4-hydroxybutyl acrylate, 1, 4-butanediol, 1, 4-hydroxybutyl acrylate, 1, 4-butanediol, 1, 4-butanediol, 1, 4-butanediol, 1, 4-butanediol, 1, 4-butanediol, 1, 4-butanediol and 1, 4-butanediol. The preparation method comprises the following steps: adding 1, 4-butanediol diacrylate, an esterification reaction catalyst and a polymerization inhibitor; carrying out extractive distillation on the concentrated solution and an extractant ionic liquid to respectively obtain a product 4-hydroxybutyl acrylate and a post-reaction extractant; and rectifying the reacted extracting agent, recovering the extracting agent, and reusing the extracting agent for extractive distillation. By adopting thin film evaporation, the separation period can be effectively shortened, and the polymerization risk is reduced; extractive distillation not only shortens the separation period and reduces the risk of polymerization, but also the ionic liquid can break azeotropy among 1, 4-butanediol, 4-hydroxybutyl acrylate and 1, 4-butanediol diacrylate, the high-purity product 1, 4-butanediol is obtained through separation, and purification of 4-hydroxybutyl acrylate is achieved.

This utility model discloses a mixed C4 alkane separation device with a heat pump system, comprising: a C4 evaporator or tank with a mixed C4 feed inlet, an extractive distillation column for separating alkanes and alkenes, and a distillation column. The inlet of the extractive distillation column is connected to the top outlet of the C4 evaporator or tank, and the stripping column is connected to the bottom of the extractive distillation column. The extractive distillation column is further connected to a heat pump system, which includes an open-loop heat pump system that transfers the low-grade heat energy of the vapor phase at the top of the extractive distillation column to the process material inside the extractive distillation column, and / or a closed-loop heat pump system that transfers the low-grade heat energy of the lean solvent after stripping from the stripping column through a multi-stage heat exchanger to the process material inside the extractive distillation column. This mixed C4 alkane separation device with a heat pump system can efficiently recover the low-grade heat energy of the vapor phase at the top of the extractive distillation column and the low-grade heat energy of the lean solvent.

The invention relates to a method for separating acetone, methanol and dichloromethane through extractive distillation by using a mixed extractant. The extractive distillation has the characteristics of simplicity in operation, high flexibility and high separation efficiency. Compared with a single extraction agent, the mixed extraction agent can generate a unique effect, so that the azeotrope is easier to separate. On the basis of extractive distillation of a mixed extractant, a heat pump technology and a heat integration technology are combined to reinforce the process, efficient separation of a ternary mixture is realized, the molar fraction of acetone after separation is greater than 99.93%, the molar fraction of methanol is greater than 99.92%, and the molar fraction of dichloromethane is greater than 99.97%. The method solves the problem that the azeotropic system is difficult to separate by using conventional rectification, is simple to operate, is economical and environment-friendly, and can realize effective separation of the ternary azeotropic mixture.

The present invention provides a free radical polymerization inhibitor, its preparation method and use, and a composition comprising hydroxyethyl methacrylate. The free radical polymerization inhibitor has a boiling point of 350°C or higher. The free radical polymerization inhibitor is applied in the extractive distillation separation process of hydroxyethyl methacrylate, and the content of the free radical polymerization inhibitor in the hydroxyethyl methacrylate product taken to the top of the column is very small, which does not adversely affect the color number and downstream application. The free radical polymerization inhibitor is selected from one or more of the following structures:

The invention belongs to the field of pentafluoroethane purification, particularly relates to an extractive distillation device for pentafluoroethane purification, and aims to solve the problem that the extractive distillation effect is poor due to the fact that an existing pentafluoroethane crude product is inconvenient to fully and uniformly contact with an extracting agent. The mounting seat is fixedly mounted in the rectifying tower; the hollow column is fixedly mounted on one side of the mounting seat; the feeding pipe is mounted on the rectifying tower, and one end of the feeding pipe extends into the hollow column; the rotating pipe is rotationally mounted at the top of the hollow column, the bottom end of the rotating pipe extends into the hollow column and is fixedly provided with a hollow rod, a plurality of liquid spraying holes are formed in the hollow rod, and a plurality of turbulent flow blocks are fixedly mounted on the outer side of the hollow rod; according to the device, a gas-phase pentafluoroethane crude product is stirred, meanwhile, the rotating pipe rotates, so that the spraying range of extract liquor is larger, the gas-phase pentafluoroethane crude product is in uniform and sufficient contact with an extraction agent, and the extraction effect is improved.

The invention relates to the technical field of chemical separation and extractive distillation, and discloses a method for separating n-hexane and methylcyclopentane by an organic Rankine cycle assisted extractive distillation dividing wall column. The device comprises two parts, one part is a cyclohexane separation tower, and the other part is an organic Rankine cycle auxiliary extractive distillation dividing wall tower. The technical innovation lies in that the original double-tower extractive distillation is coupled into a single dividing wall tower, the separation of a multi-component mixture can be realized, and meanwhile, the organic Rankine cycle is introduced from the perspective of power generation to realize the recovery of sensible heat in the tower kettle material flow of the main tower and power generation. According to the device, on one hand, the extractive distillation dividing wall column is adopted to replace the original double-column extractive distillation, so that the backmixing problem among components can be reduced, and the energy consumption and the investment cost can be reduced; and on the other hand, organic Rankine cycle is adopted to convert heat energy into electric energy, effective utilization of waste heat is achieved, and wide application prospects are achieved.

The invention belongs to the technical field of separation and purification, and particularly relates to a method for separating a methanol-dimethyl carbonate azeotrope system, which adopts a system for separating a methanol-dimethyl carbonate azeotrope and adopts a eutectic solvent as an extracting agent for extractive distillation. The hydrogen bond acceptor of the deep-eutectic solvent is choline chloride, and the hydrogen bond donor of the deep-eutectic solvent is malonic acid or urea. According to the method, the choline chloride deep eutectic solvent which is lower in cost, simpler and more convenient to prepare and more environmentally friendly is selected as the extracting agent, systematic process parameter optimization and equipment configuration design are carried out according to the high-viscosity characteristic of the choline chloride deep eutectic solvent, and stable, efficient and long-period operation of the high-viscosity green solvent in the continuous extractive distillation process is successfully achieved; the target of separating the methanol and the dimethyl carbonate from the binary mixture is achieved, the final yield of the methanol and the dimethyl carbonate can reach 99% or above, the product purity can reach 99.5% or above, and compared with a traditional solvent separation method, the energy consumption is greatly reduced, the equipment cost is saved, and the method is suitable for industrial production. The strict standard of the high-end chemical industry and the fine chemical industry on the raw material purity can be reached.

The invention provides an efficient pyridine dehydration device and method based on a partition wall extractive distillation column, and belongs to the field of chemical separation, the efficient pyridine dehydration device comprises the partition wall extractive distillation column, the partition wall extractive distillation column is provided with an extraction agent inlet, a raw material inlet and an extraction agent extraction outlet, and a vertically arranged partition plate is arranged in the partition wall extractive distillation column; the partition wall extractive distillation tower is divided into a main tower and an auxiliary tower which are transversely distributed by the partition plate, and a public stripping section communicated with the main tower and the auxiliary tower is formed at the lower end of the partition plate. According to the invention, the functions of an extractive distillation tower and a solvent recovery tower are combined, and a form of a main tower and an auxiliary tower is formed in one tower, so that the number of equipment is obviously reduced, the occupied area of the equipment is effectively reduced, the space resource of a factory is saved, meanwhile, connecting pipelines and related accessories between the equipment are reduced, and the integration level of the equipment is improved by more than 30%; the design of the partition wall optimizes the material flow distribution in the tower, so that the rectification process is more efficient.

The invention relates to the technical field of butanone-water azeotropic system separation, in particular to a method for separating butanone from a butanone-water azeotropic system. According to the method for separating butanone from the butanone and water azeotropic system, a device is used for separation, and the device comprises an extractive distillation tower, an extraction agent recovery tower and a water-extraction agent separation tower. According to the method, p-xylene is taken as an extraction agent, butanone in a butanone and water azeotropic system is extracted by an extractive distillation tower, and a butanone-p-xylene mixture and a water-p-xylene mixture are obtained. The butanone-p-xylene soluble mixture is rectified and separated into butanone and p-xylene through an extractant recovery tower. And rectifying and separating the water-p-xylene solution mixture into water and p-xylene through a water-extractant separation tower. The extracting agent disclosed by the invention has the advantages of low intersolubility with water and high selectivity to butanone, is low in extracting agent residue and stable in separation effect, and has a good application prospect in separation of a butanone-water azeotropic system.

The utility model relates to the technical field of toluene mixed liquor, in particular to a storage tank for production of extractive distillation toluene mixed liquor, which comprises a tank body, a feed port, a discharge port, a stirring component and a vibration component, a plurality of layers of stirring blades with different shapes and sizes of the stirring component can form a complex and strong stirring flow field in the tank under the driving of a stirring shaft, so that the stirring effect is improved. The stirring blades in different layers can stir toluene mixed liquid from different angles and depths, the stirring assembly can rapidly stir and mix new raw materials and original mixed liquid in the tank, the synergistic effect of the multiple layers of stirring blades can rapidly disperse the newly added raw materials so that the newly added raw materials can be evenly blended into the original mixed liquid, and the stirring efficiency is improved. The vibration assembly is installed at the bottom of the tank body and can enable the tank body to vibrate during working, mixed liquid in the tank is promoted to flow more violently and is overlapped with the stirring effect of the stirring blades, and components in the mixed liquid are more fully mixed.