107results about "Multiple-effect/fractional condensation" patented technology

The invention provides an impurity deep removal and purification device in ES fiber solvent recovery. Relates to the technical field of electrostatic spinning process and solvent recovery, and comprises a pre-separation module used for removing fiber residues and solid particles larger than 5 microns in solvent-enriched gas; the multi-stage deep condensation module comprises two stages of condensers, and the two stages of condensers condense the solvent steam according to the gradually decreased temperature and intercept micro-droplet impurities; and the composite adsorption module is used for adsorbing residual organic trace impurities and removing water. The impurity deep removal and purification device in ES fiber solvent recovery has the advantages of being low in energy consumption, easy and convenient to maintain, stable in operation and capable of being continuously online for 72 h or above without shutdown, the solvent recovery rate is remarkably increased, the operation cost is reduced, and the potential risk of organic vapor emission to the environment and operation safety is effectively avoided.

The invention belongs to the field of chemical production, and particularly relates to a chloromethane cooling recovery system and a chloromethane cooling recovery method. The chloromethane cooling recovery system provided by the invention comprises a first condenser, a second condenser, a third condenser and a recovered chloromethane storage tank, a shell pass inlet of the second condenser is connected with a tube pass outlet of the third condenser, and a tube pass inlet of the third condenser is used for introducing liquid chloromethane. Chloromethane is cooled and recovered by using a liquid chloromethane vaporization heat absorption principle, so that the economical efficiency is good; in addition, due to the fact that the to-be-cooled object and the refrigerant are both methyl chloride, even if mutual leakage occurs in the heat exchange process, the quality of recycled methyl chloride cannot be affected, and raw material losses cannot be caused.

The invention relates to the technical field of energy systems, in particular to a methane gradient utilization system based on SOFC (solid oxide fuel cell) and copper chloride circulation, comprising a methane reforming and SOFC power generation unit for converting methane fuel into electric energy and combusting anode tail gas to generate high-temperature flue gas; the copper-chlorine circulating hydrogen production unit is connected with a high-temperature flue gas pipeline of the methane reforming and SOFC power generation unit, heat energy of the high-temperature flue gas is used for driving a copper-chlorine thermochemical circulating reaction, and hydrogen is prepared by taking water as a raw material; and the waste heat power generation and recovery unit is connected with a cathode tail gas pipeline of the methane reforming and SOFC power generation unit and a tail gas outlet pipeline of the copper chloride circulation hydrogen production unit, and is used for carrying out power generation and heat supply on waste heat in a cascade recovery system. According to the system, grade alignment and gradient utilization of energy are achieved, high-temperature waste gas of the SOFC system is sequentially used for driving copper-chlorine hydrogen production, ORC power generation and hot water supply, and the comprehensive utilization efficiency of energy is remarkably improved.

A separation system for separating constituents from a solution by utilizing a carrier gas and a separation method thereof are disclosed. The separation system includes an evaporator, a solution distribution unit connected to the evaporator for distributing the solution into the evaporator, and a gas distribution unit connected to the evaporator for distributing the carrier gas into the evaporator. The solution is countercurrent to the carrier gas and upon contact, at least one constituent of the solution is vaporized and separated from the solution.

The invention provides a system and method for recycling methane chloride from methyl chlorosilane synthesis tail gas. According to the method, 85%-90% of methane chloride in the methyl chlorosilane synthesis tail gas is recycled in a three-stage sectional type condensation mode. 90-95% of residual methane chloride is recovered through directional absorption of dichloromethane; and finally, residual methane chloride is recovered in a decompression analysis and reflux impurity removal mode, the total recovery rate of methane chloride is larger than or equal to 99%, the purity of methane chloride is larger than or equal to 99.5%, waste of methane chloride is greatly reduced, high recovery of methane chloride is achieved, and methane chloride can be directly reused in a methyl chlorosilane synthesis reaction.

A method of producing useful fuel fluids from solid plastic waste, including loading solid plastic waste matter into a reaction chamber to define a load, subjecting the load to HTP to extract hydrocarbon mixtures, filtering the hydrocarbon mixtures to extract solid matter, and separating the hydrocarbon mixtures into a light fraction (C1 to C25) and a heavy fraction (C26 to C31). The heavy fraction is directed to a first container and the light fraction is directed to a second container. The light fraction is separated into diesel (C8-C25), gasoline (C4-C12), and vapor (C1-C5), and the diesel is directed to a third container, the gasoline is directed to a fourth container, and the vapor is directed to a fifth container. The hydrocarbon mixtures have a carbon number distribution between C1 and C31. The pressure in the reaction chamber is typically between 0.1 and 10 MPa and the temperature in the reaction chamber is between 350 and 500 degrees Celsius. The plastic waste is selected from the group consisting of PS, PE, PP, and mixtures thereof.

The invention relates to a deuterium water conversion and purification system, and belongs to the technical field of isotope separation and purification. The system comprises a deuterium gas supply unit, a deuterium gas electrochemical reaction conversion unit, a multi-stage condensation separation purification unit and a deuterium water storage unit. On the basis of deuterium gas supply pressure, non-stop automatic switching is triggered, and deuterium gas non-backflow control is executed through a backflow blocking mechanism; generating electric energy and tail gas containing deuterium water vapor based on continuously supplied deuterium gas and a drying oxidant; a gradient gas-liquid separation process and a closed-loop temperature control regulation mechanism are adopted to obtain primarily purified liquid deuterium water, and high-purity deuterium water is generated through a high-selectivity ion exchange adsorption process; and obtaining deuterium water storage capacity data and conductivity parameters, analyzing the deuterium water storage capacity data and the conductivity parameters with a preset conductivity parameter threshold value, and triggering purification material regeneration reminding. The system realizes collaborative linkage of deuterium gas supply, conversion, purification and storage monitoring, and ensures the continuity and purity stability of deuterium water preparation.

A system and method for controlling the temperature of a medium by refrigerant vaporization, working gas condensation, or a combination of both, the system including a container, at least one working gas storage tank having at least one storage tank section including a wall thermally coupled to a volume of medium within the container and having an exterior surface constructed to provide a volume of medium thermal coverage within the container, and a condenser for regulating working gas condensation in the storage tank, whereby the working gas storage tank forms a vapor space in each of the at least one storage tank section in response to receiving working gas and regulating condensation in the condenser to enable working gas condensation at or near a selected temperature of a volume of medium within the container thermally coupled to the respective storage tank section.

An apparatus for intense / rapid cooling and for removing a substance in suspension in a gaseous fluid, said apparatus comprising: i) conveying means (2) for conveying the gaseous fluid; ii) a system (3) for alternatively condensing / freezing or defrosting the substance present in the gaseous fluid comprising: - a first group (31) of cooling or defrosting stages; - a second group (32) of cooling or defrosting stages; - means for collecting the substance (347); - the conveying means (2) comprising a first and a second line (311, 321) operatively arranged in parallel; iii) a heat exchanger (4) for pre-cooling the gaseous fluid upstream of the first group (31) or second group (32); iv) the conveying means (2) comprising means (5) for transporting to the heat exchanger (4) the gaseous fluid that is present downstream of the first group (31) or second group (32) to remove heat from the gaseous fluid that is present upstream of the first group (31) or second group (32) and passes through the heat exchanger (4); v) directing means (6) for directing the fluid alternatively towards the first or towards the second line (311, 321), vi) a first fan (71) and a second fan (72) situated along the conveying means (2); the volumetric flow rate of the gaseous fluid generated by the first fan (71) being greater than the air flow rate generated by the second fan (72).

The invention discloses a hazardous waste molten flue gas quenching-dust removal integrated heavy metal trapping device which comprises a first recovery treatment mechanism, a second recovery treatment mechanism and a cyclone dust collector. According to the invention, the residence time of the hazardous waste molten flue gas is greatly reduced, and the high-temperature flue gas can be rapidly cooled from 800 DEG C to 450 DEG C and 200 DEG C by using a heavy metal cascade condensation technology, a first recovery treatment mechanism and a second recovery treatment mechanism, so that the residence time of the flue gas in a temperature window where harmful substances are easily generated is greatly shortened, and the energy consumption is reduced. The generation probability of harmful substances such as dioxin is reduced, various heavy metals can be effectively recycled conveniently, residual particles in flue gas can be further removed through the cyclone dust collector, and residual tiny particles, toxic gases such as dioxin and the like can be efficiently captured by spraying activated carbon into the cyclone dust collector. And it is ensured that the exhaust gas finally discharged into the atmosphere meets the environmental protection standard.

The invention discloses a carbon emission online monitoring system with double-point fusion before and after desulfurization, and relates to the technical field of environmental monitoring and carbon emission control, the system comprises a desulfurization tower, a pre-desulfurization monitoring unit installed in a gas inlet pipeline of the desulfurization tower, a post-desulfurization monitoring unit installed in a gas outlet pipeline of the desulfurization tower, and two sets of gas pretreatment systems, and the data fusion processing modules are respectively integrated in the pre-desulfurization monitoring unit and the post-desulfurization monitoring unit, and are used for acquiring the pre-desulfurization concentration data and the post-desulfurization concentration data provided by the monitoring units, completing CO2 emission calculation and carbon emission factor fusion calculation in combination with flue gas parameters and desulfurizer consumption data, and outputting optimized carbon emission factors and CO2 accumulative emission. According to the method, gas synchronous online monitoring is carried out, double-point data are fused, and the accuracy and reliability of carbon emission accounting are improved.

The invention belongs to the technical field of sulfur preparation, and particularly relates to an acid gas sulfur recovery process with low sulfur emission. A Claus unit and a tail gas treatment unit are adopted in the low-sulfur-emission acid gas sulfur recovery process, and the tail gas treatment unit firstly performs selective hydrogenation on tail gas flow from the Claus unit and then performs subsequent treatment; the selective hydrogenation catalyst contains 2-3wt% of cobalt (calculated as CoO), 1.5-2wt% of nickel (calculated as NiO), 11-13wt% of molybdenum (calculated as MoO3), 3-4wt% of lanthanum (calculated as La2O3) and the balance of carrier components; the carrier comprises the following components in percentage by weight: 80 to 85 percent of TiO2 and the balance of CaSO4. The gas flow at the outlet of the selective hydrogenation reactor can reach a low-sulfur emission level after being treated by a conventional method, the technical requirement on a post-treatment process is relatively low, and a preorder Claus unit has relatively wide-range operation flexibility.

The invention relates to the technical field of solid waste resource utilization, in particular to a waste wind power blade high-temperature plasma recovery system and device based on AI closed-loop control, and the system comprises a raw material pretreatment module which is used for receiving waste wind power blades and carrying out crushing and drying treatment on the waste wind power blades to obtain pretreated materials; the high-temperature plasma cracking module is connected with the raw material pretreatment module and is used for receiving the pretreated material and cracking the pretreated material into combustible gas and solid residues; comprising a high-temperature plasma reaction chamber, a plasma generating device, a feeding device, a reaction chamber monitoring sensor group and an AI control unit, the gas-solid separation and condensation module is connected with an outlet of the high-temperature plasma cracking module, receives the combustible gas and the solid residues, performs gas-solid separation on the combustible gas and the solid residues, and condenses and recovers the combustible gas; and the tail gas purification module is connected with a gas outlet of the gas-solid separation and condensation module.

The invention discloses a staged cooling distillation tower, relates to the technical field of distillation equipment, and aims to solve the technical problem of poor condensation effect due to the adoption of a single or two-stage cooling structure in a conventional distillation tower cooling system. A pre-cooling system, a main cooling system and a rear cooling system are designed, and a cooling medium of 20-30 DEG C circulates in the pre-cooling system; the main cooling system serves as a core condensation unit and is matched with a low-temperature cooling medium of-10 DEG C to 0 DEG C, shock cooling of steam can be achieved within an extremely short time, a cooling agent of 10 DEG C to 20 DEG C of the post-cooling system is fully mixed with residual steam in a mist form, and secondary condensation is conducted on a trace amount of uncondensed steam. The three-stage cooling system disclosed by the invention forms a full-process condensation system of buffering, shock cooling and fine treatment through temperature gradient control, so that the condensation effect of the distillation tower is optimized, and products in steam are better separated.

The invention provides a purge gas treatment system and process for a high-pressure EVA device, the purge gas treatment system comprises a VA recovery unit, the VA recovery unit is provided with a first-section cooler, a second-section cooler and a liquid separation tank which are communicated in sequence, and the first-section cooler and the second-section cooler are used for performing depressurization condensation treatment on purge gas to condense part of gas of the purge gas into a liquid phase; gathering pipelines for gathering and conveying liquid phases are arranged at the bottoms of the first-section cooler, the second-section cooler and the liquid separation tank; the tail end of the gathering pipeline is communicated with a storage tank, and the storage tank is connected with a VA refining unit for recycling VA; and the low-pressure circulation unit is connected to a gathering pipeline between the liquid separation tank and the storage tank and is used for flashing ethylene in a liquid phase into a gas phase and introducing the ethylene into the supercharger, and the liquid phase is conveyed into the storage tank. Compared with the prior art, the purge gas treatment system in the scheme is used for separating and recycling ethylene in the liquid-phase VA, so that the loss of an ethylene raw material is reduced, and the ethylene is prevented from entering a torch system to burn to pollute the environment.

The invention discloses a research method and a solvent recovery device for an automotive scratch-resistant epoxy polysiloxane assistant, and belongs to the technical field of automotive interior material assistants.The research method comprises the steps that S1, an earlier-stage preparation stage is conducted, specifically, allyl butyl glycidyl ether (the epoxy equivalent is 230-250 g / eq), C12-C18 epoxy-terminated olefin, hydrogen-containing polysiloxane (the hydrogen content is 0.12-0.15 wt%) and a platinum catalyst (3-5 ppm) are prepared; s2, an auxiliary agent synthesis and solvent recovery stage: introducing nitrogen into the reaction kettle to form a protective atmosphere, adding allyl butyl glycidyl ether accounting for 60% of the total amount, and starting a stirring device to enable the allyl butyl glycidyl ether to be uniformly distributed; after the reaction is finished, detecting that the free epoxy value of a product is greater than or equal to 95%, feeding the product into a film evaporator, removing low-boiling-point substances under the condition of 120 DEG C / 5kPa until volatile components are less than or equal to 0.8% to obtain an epoxy polysiloxane auxiliary agent, purging equipment by using nitrogen after the recovery is finished, and regularly pickling a condenser pipe for maintenance; the method has the technical effects that the surface energy and the friction coefficient of the material are optimized at the same time, and the solvent recovery efficiency is high.

The invention discloses an adipic acid crystallizer vacuum system and method capable of realizing zero liquid discharge of nitrogen-containing wastewater, which adopts a multi-stage Roots vacuum unit to realize pressure control on the adipic acid crystallizer vacuum system and a nitric acid concentration tower through a front buffer tank of the multi-stage Roots vacuum unit. Most condensable gas of the nitrite-containing steam generated by the adipic acid crystallizer is condensed and recovered to a condensate tank by using a gas condenser; uncondensed nitrogen-containing gas and a gas phase of the nitric acid concentration tower enter a buffer tank through pressure control, then are extruded by a multi-stage vacuum unit and are subjected to deep condensation treatment, condensed liquid enters a liquid storage tank through potential difference, and liquid in the liquid storage tank is sent to the nitric acid concentration tower through liquid level control to serve as reflux absorption liquid to absorb nitrite gas volatilized by the concentration tower; the adipic acid crystallizer vacuum system technology replaces a traditional steam injection pressurization vacuum system technology, consumption of medium-pressure steam and circulating water is reduced, zero liquid discharge of nitrogen-containing wastewater is achieved, and the adipic acid crystallizer vacuum system technology has remarkable environmental protection benefits and economic benefits.

The invention relates to a waste sulfuric acid regeneration system which comprises a waste acid storage tank, a first stirring tank connected to the output end of the waste acid storage tank, a first stirring tank, a second stirring tank and a semi-finished product storage tank connected in sequence, a reaction kettle connected to the output end of the semi-finished product storage tank, a condenser connected to a finished product output port of the reaction kettle, and a second stirring tank connected to the second stirring tank. The condenser, the buffer tank and the finished product storage tank are connected in sequence; compared with a high-temperature cracking method which needs a cracking furnace to maintain high temperature and a concentration distillation method which needs a titanium material or an enamel evaporator, the method provided by the invention has the advantages of low requirements on production equipment, lower control difficulty, and capability of running only through simple equipment such as a stirring tank, a reaction kettle, a condenser and the like, so that the investment cost of the system is lower; compared with a chemical oxidation method in which ozone needs to be utilized, the ozone is difficult to store and often needs to be prepared and used on site, and the cost is relatively high, but potassium permanganate, hydrogen peroxide and nitric acid used in the method are easy to store, so that the production steps are simple, and the production cost is reduced.

The invention belongs to the field of chemical condensation, and discloses a multistage tandem refined vinyl chloride rectification tail gas condenser group, which is characterized in that a first wind shielding piece is arranged at the joint of a storage channel and a gas transmission channel, and the first wind shielding piece has an open state and a closed state; when the first air blocking piece is in an open state, the first air blocking piece is controlled to move into the storage channel, the deicing assembly can stretch into the air conveying channel through the tail end of the storage channel, the deicing assembly is matched with the first air blocking piece, and when the deicing assembly is in a non-use state, the first air blocking piece is in a closed state. At the moment, the first air blocking piece forms an approximately continuous air flow surface at the tail end of the storage channel and the inner wall of the air conveying channel, so that the situation that air flow enters the deicing channel, and consequently tail gas in the air conveying channel is shunted is reduced, and the smoothness of air flowing in the air conveying channel is improved under the condition that the deicing assembly is arranged in the air conveying channel.

The invention provides dispergation equipment for a retired battery pack, which comprises a device body, a dispergation groove is arranged in an inner cavity of the device body, and a closed dispergation chamber is formed in the dispergation groove; the temperature control module is arranged in the peptizing chamber; the circulating filtration module comprises a circulating pump and a filter communicated with the circulating pump, and the circulating pump is communicated with the peptizing chamber; the cooling module comprises a condensing coil assembly, and the condensing coil assembly is arranged in the peptizing chamber; the ultrasonic module is in contact connection with the peptizing tank; and the exhaust purification module comprises an exhaust fan which is arranged at the top of the device body and communicates with an inner cavity of the device body, the air inlet end of an exhaust pipe of the exhaust fan communicates with the inner cavity of the device body, and an air purifier is arranged in the exhaust pipe. The dispergation method provided by the invention is used for the dispergation equipment, and the ultrasonic module and the temperature control module are arranged, and the functions of solvent condensation recovery and circulating filtration are integrated, so that the safety, environmental protection and automation of the dispergation process are ensured.

Methods and systems for converting waste plastics into various useful downstream recycle content products are provided. More particularly, the present systems and methods involve integrating a pyrolysis facility with a cracker facility by introducing at least one r-pyrolysis gas stream into the cracker facility. In the cracker facility, the r-pyrolysis gas can be separated to form one or more recycle content products, and operation of the facility can be improved.

The invention relates to the technical field of separation equipment, in particular to polymer solvent removal and separation equipment which comprises a climbing film evaporator and a rectifying tower, the climbing film evaporator is used for primary separation of a polymer solvent, and the rectifying tower is used for secondary separation of the polymer solvent after primary separation of the climbing film evaporator. During use, multiple stages of gas-liquid separation mechanisms are arranged above the heating and boiling mechanism, different condensation temperatures of the gas-liquid separation mechanisms are set, a liquid isolation structure is arranged in a gas-liquid rising channel for separation, and an opening part of the liquid isolation structure is sealed through a pressure maintaining structure; the rising airflow generated in the heating process can push the pressure maintaining structure to be in contact with the condensation structure to be condensed to form gas-liquid separation, and the low-volatility gas continues to rise to the next stage to be condensed and separated, so that the effects of improving the heating efficiency and enabling the gas to be fully condensed and separated are achieved.

The invention relates to the technical field of separation, and particularly discloses vacuum tail gas condensation treatment equipment which comprises a treatment tank, a first partition plate and a second partition plate are sequentially arranged in the treatment tank from bottom to top, a first condensation cavity is formed below the first partition plate, and a second condensation cavity is formed above the second partition plate; a cooling cavity is formed between the first partition plate and the second partition plate, and an isolation bin is arranged in the cooling cavity; the first condensation unit is arranged between the first partition plate and the isolation bin; the separation unit is arranged in the isolation bin; the second condensation unit is arranged between the isolation bin and the second partition plate; the first condensation unit and the second condensation unit are used for conducting primary condensation and secondary condensation on the vacuum tail gas respectively, the condensation efficiency is effectively improved, and liquid components in the tail gas are effectively separated and collected; the separation unit can switch an air flow path in a transient state during operation, isolation and non-stop replacement of a blocked filter plate are achieved, continuous and stable operation of equipment is guaranteed, and therefore the tail gas treatment efficiency is improved.

The invention relates to the technical field of melamine, and discloses an energy-saving clean joint production method and system for melamine and high-quality soda ash, the production method comprises the following steps: using urea as a raw material to produce melamine, and collecting a byproduct melamine tail gas; the method comprises the following steps: reacting melamine tail gas with alkali liquor in a reactor to form solid-containing slurry and residual gas; sequentially carrying out flash evaporation and solid-liquid separation on the solid-containing slurry, and drying and cooling the obtained solid to obtain a sodium carbonate product; the alkali liquor is an aqueous solution of alkali metal hydroxide and / or alkaline earth metal hydroxide; the reaction temperature ranges from 100 DEG C to 250 DEG C, and the reaction pressure ranges from 0.6 MPa to 10.0 MPa. According to the invention, urea is used as a raw material to produce melamine and obtain melamine tail gas, then the characteristic that carbon dioxide and ammonia in the melamine tail gas have different solubility in a caustic soda solution is utilized to realize thorough separation of ammonia and carbon dioxide, and the carbon dioxide and caustic soda generate sodium carbonate.

The present application relates to dichloromethane recovery technical field, specifically to a kind of wet lithium battery diaphragm production line dichloromethane recovery system, including primary condenser, secondary condenser, tertiary condenser, stratified tank, aeration tank and gas-liquid separator, the air inlet pipe of the primary condenser is provided with pretreatment device, the stratified tank is equipped with first recovery pipe and first waste pipe, the aeration tank is equipped with second recovery pipe and second waste pipe, the aeration tank is equipped with aeration fan, the present application recycles and utilizes water phase change heat in desorption steam by primary condenser, the gas, liquid temperature at export is above 90 DEG C, most of dichloromethane is still gaseous, and most of water is liquefied, after separation by gas-liquid separator, the gas phase containing a small amount of water is sent to subsequent secondary condenser and tertiary condenser, can greatly reduce cooling load, and high-temperature liquid phase is directly sent to aeration tank, and it is not necessary to heat again, and the purpose of energy saving can be achieved.

Embodiments of the invention provide systems and methods for water treatment and / or desalination.

The invention relates to the technical field of chemistry and chemical engineering experiments, in particular to an environment-friendly organic comprehensive experiment platform which comprises an efficient distillation assembly, a column chromatography assembly, an extraction assembly, a decompression filtering assembly and a comprehensive control assembly. The efficient distillation assembly comprises a distillation bottle, a distillation head, a dustproof assembly, a flange clamp, a primary condenser, a secondary condenser, a liquid separator and a liquid receiving bottle, the column chromatography assembly comprises a solvent storage bottle, a chromatographic column and a leacheate receiving bottle; the extraction assembly comprises an extraction bottle, a sealing cover, a liquid extraction pipe and a filter barrel; the decompression filtering assembly comprises a solvent receiving bottle, a decompression funnel, a sealing cover and a pressure balancer; the comprehensive control assembly comprises a hot bathing pool, a cold bathing pool, a cooling liquid conveying pump, a solvent conveying pump, a circulating air pump, an air pressure adjusting pump, air pressure sensors A and B, stop valves A and B, a liquid level meter and a central controller. The method has important significance for improving the working environment of a laboratory and promoting the early realization of the dual-carbon target in China.

The invention discloses a device and a method for purifying ammonia water by using ammonia-containing wastewater. The device comprises an ammonia-containing wastewater storage tank, a raw material conveying pump, an intelligent pH adjusting module, a coupling type steam stripping rectifying tower, a mechanical heat pump compressor and a multi-stage gradient condensation system, the ammonia-containing wastewater storage tank, the raw material conveying pump and the intelligent pH adjusting module are sequentially connected through a pipeline; an outlet of the intelligent pH adjusting module is connected to a feeding hole of the coupling type steam stripping rectifying tower; a top steam outlet of the coupling type stripping rectifying tower is connected to a gas inlet of the mechanical heat pump compressor, and a gas outlet of the mechanical heat pump compressor is connected to a heating medium inlet of a reboiler arranged at the bottom of the coupling type stripping rectifying tower. Latent heat of tower top steam is recycled through the mechanical heat pump and used for tower bottom heating, an energy closed loop is formed, the demand quantity of the system for external steam is extremely low, and compared with a traditional process, the operation energy consumption can be reduced.

The invention discloses an NMP (N-Methyl Pyrrolidone) recovery skid-mounted device which comprises a dehydrating tower, a light component removal tower, a primary refining tower, a secondary refining tower, a dehydrating tower vacuum buffer tank, a refining tower vacuum buffer tank and an emergency discharge tank, the middle section of the dehydrating tower is communicated with an NMP recovery liquid pipeline, and the top of the dehydrating tower is communicated with a dehydrating tower condenser; the bottom of the dehydrating tower condenser is communicated with a dehydrating tower return tank; and one side of the top of the dehydrating tower return tank is communicated with the dehydrating tower vacuum buffer tank through a dehydrating tower non-condensable gas discharge pipeline. The NMP recovery liquid is refined by adopting a three-stage rectification process, and the work division of each rectification tower is clear: the first-stage tower is used for removing water and low-boiling-point substances, the second-stage tower is used for further purifying NMP, and the third-stage tower is used for removing trace high-boiling-point substances. And after three-stage rectification treatment, the chromaticity, the moisture content and the impurity ion content of the NMP product extracted from the tops of the primary refining tower and the secondary refining tower all meet the strict requirements of lithium ion battery production.