1095results about "Vacuum distillation separation" patented technology

An aqueous stream cleaning system including a circulation pump to receive a waste fluid and / or a concentrated liquid bottoms stream, and expel a circulation stream. The aqueous stream cleaning system can also include a primary heat exchanger to receive the circulation stream from the circulation pump. The primary heat exchanger can have a plurality of heat exchange plates that define an internal surface area for heat transfer from a distillate stream to the circulation stream to produce a cooled distillate stream and a heated circulation stream. The plurality of heat exchange plates can be spaced to facilitate free flow of solids in the circulation stream between the plurality of heat exchange plates. A mass flow rate and pressure of the circulation stream can be configured to minimize build-up of solids in the primary heat exchanger. The aqueous stream cleaning system can further include an evaporation unit to receive the heated circulation stream from the primary heat exchanger. The distillate stream is formed when steam in the heated circulation stream evaporates in the evaporation unit, and the concentrated liquid bottoms stream is formed from a portion of the heated circulation stream that does not evaporate.

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

Methods and systems for separating a first metal from a metal-containing feed stream are provided. The method can include applying solar energy, for example, by focusing one or more mirrors in one or more heliostats, to heat a metal-containing feed stream in a heating zone to a first temperature to produce a first vapor including the first metal. The first vapor can be condensed in a condensation zone to produce a first liquid including the first metal, and the first liquid can be collected. The system can include a separation unit include a heating zone in fluid communication with a condensation zone and a means for applying solar energy to heat a metal-containing feed stream disposed in the heating zone.

The invention belongs to the technical field of resource regeneration, and particularly relates to a method for recycling hydrochloric acid and germanium through direct two-stage distillation after germanium chlorination distillation, which comprises germanium chlorination distillation, first-stage positive pressure acid steaming, second-stage negative pressure acid steaming and kettle stopping and slag liquid discharging. According to the invention, two-stage acid distillation is directly carried out in the original production equipment system after germanium chlorination distillation, so that the innovation of integrated continuous production of germanium chlorination distillation and acid distillation in the same equipment system is realized, the process is more energy-saving and economic, the operation is simpler and more convenient, the equipment utilization rate is higher, and the environment is more friendly; the recycling rate of hydrochloric acid is up to 60% or above; a one-stage positive-pressure acid steaming process is adopted, high-concentration hydrochloric acid with the HCl molar concentration larger than or equal to 9.5 mol / L is regenerated and can be directly returned to germanium chlorination distillation for use, and synchronous limit recovery of residual germanium in germanium chlorination distillation residues is achieved; therefore, full recycling of hydrochloric acid and germanium in germanium chlorination distillation waste acid and waste residues is realized.

A brine concentration system may include a closed-cycle heat pump, a brine heater configured to heat brine, a flash tank to evaporate a portion of heated brine to steam, and a steam condenser in which to condense the steam to distilled water. The system may include an electric vacuum pump in connection with the flash tank and the steam condenser. The electric vacuum pump may reduce a pressure within the flash tank and the steam condenser to reduce a boiling point of the brine. The system may include a controller that dynamically adjusts operations of the closed-cycle heat pump and / or the electric vacuum pump.

The utility model relates to a high-purity red phosphorus production device which comprises a stainless steel sealed pressure container, an infrared electric heater is arranged in the stainless steel sealed pressure container, an outer-layer high-purity quartz tube is arranged in the infrared electric heater, an inner-layer high-purity quartz tube is arranged in the outer-layer high-purity quartz tube, and an inner-layer high-purity quartz tube is arranged in the inner-layer high-purity quartz tube. Two ends of the inner layer high-purity quartz tube are closed, through holes are formed in the circumferential surface of the inner layer high-purity quartz tube, one end of the outer layer high-purity quartz tube is closed, and the other end of the outer layer high-purity quartz tube is provided with an opening which is hermetically connected with a stainless steel tube joint which is respectively connected with a nitrogen system and a vacuum system after extending out of an end socket of the stainless steel sealed pressure vessel; the stainless steel sealed pressure container is further provided with a nitrogen charging and discharging port which is connected with a nitrogen system. According to the utility model, the nested inner-layer high-purity quartz tube and the nested outer-layer high-purity quartz tube are adopted, discharging is carried out in the inner-layer high-purity quartz tube, red phosphorus is convenient to take out, nitrogen is filled inside and outside the outer-layer high-purity quartz tube, pressure balance inside and outside the outer-layer high-purity quartz tube is kept, and safety is ensured.

The invention discloses an ammonia distillation, dehydration and refining system for alcohol amine products. The system comprises an ammonia distillation device, a dehydration device, a vacuum device, a tail gas absorption device, a first ethyl rectification device, a second ethyl rectification device and a third ethyl rectification device. By optimizing the production process and adopting advanced production equipment, efficient, energy-saving and environment-friendly production of the alcohol amine product is realized.

The invention provides a static film devolatilization device and application thereof, and the static film devolatilization device is a static single-layer film devolatilization device or a static multi-layer film devolatilization device. The static single-layer film devolatilization device is a static film devolatilization device, the static double-layer film devolatilization device is a static film devolatilization device, and the static double-layer film devolatilization device is a static film devolatilization device; the surface layer of a film plate of the static film devolatilization device is planar, trapezoidal or wavy; the thin film plates of the static thin film devolatilization device are circular, fan-shaped, double-arc-shaped or rectangular, and each layer of thin film plate of the static thin film devolatilization device is completely or partially covered; the static film devolatilization device is suitable for devolatilization of high-viscosity fluid or high-viscosity melt with the viscosity of 50-10000 Pa.s produced by a solution method, a slurry method, a precipitation method, a liquid phase bulk method and the like.

The utility model discloses a negative pressure distillation extraction device for anthracene oil, comprising a base plate and a main distillation tower, the main distillation tower is installed on the left side of the top of the base plate, and a negative pressure pump is installed on the top of the main distillation tower, a discharge pipe is installed on the upper right side of the outside of the main distillation tower, and a fixed sleeve is installed between the discharge pipe and the main distillation tower, and a first extraction pump is installed below the discharge pipe. The negative pressure distillation extraction device for anthracene oil is provided with a first extraction pump installed below the discharge pipe. During the vaporization process of coal tar, the first extraction pump can be introduced into four groups of connecting pipes through the discharge pipe, and tar, anthracene oil and the like can be extracted according to different boiling points. Cold water is injected from the liquid inlet pipe, and the connecting pipe for transporting gas is fitted with a condensing coil, and then the finished products are extracted from the liquid outlet pipe. After cooling, the finished products are respectively dropped into storage boxes for storage, thereby preventing waste of resources and solving the problem of inconvenient graded collection.

Methods and systems for separating a first metal from a metal-containing feed stream are provided. The method can include applying solar energy, for example, by focusing one or more mirrors in one or more heliostats, to heat a metal-containing feed stream in a heating zone to a first temperature to produce a first vapor including the first metal. The first vapor can be condensed in a condensation zone to produce a first liquid including the first metal, and the first liquid can be collected. The system can include a separation unit include a heating zone in fluid communication with a condensation zone and a means for applying solar energy to heat a metal-containing feed stream disposed in the heating zone.

The invention belongs to the technical field of waste PET (Polyethylene Terephthalate) recovery, and particularly relates to a continuous production system and process for efficiently recovering and refining PTA (Purified Terephthalic Acid) from waste PET and application. According to the continuous production system and process for efficiently recovering and refining the PTA from the waste PET, through mutual cooperation of the enzymolysis unit, the first solid-liquid separation unit, the filter cake dissolving and decolorizing unit, the electrolysis unit, the second solid-liquid separation unit and the recrystallization unit, continuous production of'obtaining the refined PTA by taking the waste PET as a raw material 'is realized; besides, by adjusting the runner structure in the electrolysis assembly of the electrolysis unit, the situation of electrolysis interruption caused by the fact that TA generated by electrolysis is prone to being deposited on the surface of the anode plate is avoided, guarantee is provided for continuous proceeding of the whole degradation and recovery process, and the system and the process have important significance on efficient degradation and recovery of waste PET.

Fluorinated coupling agents and polymerizable compositions including such fluorinated coupling agents and at least one free-radically polymerizable monomer, oligomer, or mixture thereof. Multilayer films including a substrate and at least a first layer overlaying a surface of the substrate also are described, in which the at least first layer includes a (co)polymer obtained by polymerizing the foregoing polymerizable compositions. Processes for making a multilayer film using the polymerizable composition also are taught. Articles including the multilayer film also are disclosed, in which the article preferably is selected from a photovoltaic device, a display device, a solid-state lighting device, a sensor, a medical or biological diagnostic device, an electrochromic device, light control device, or a combination thereof.

The invention provides a capsaicin crude extraction device and a capsaicin crude extraction method, and relates to the technical field of capsaicin extraction. The capsaicin crude extraction device comprises an outer cylinder, a feeding assembly and a crushing assembly, wherein a feeding channel is formed among the outer cylinder, an inner cylinder and a filter cylinder; the crushing assembly comprises a spiral conveying blade and a crushing part, chilli powder in the inner cylinder can only enter the space between the outer cylinder and the inner cylinder from the top of the side wall of the inner cylinder and fall into the filter cylinder through the feeding channel, absolute ethyl alcohol entering the reaction cylinder and the filter cylinder can only react with the chilli powder in the filter cylinder, and dry-wet separation is achieved; the spiral conveying blade conveys the chilies from the bottom end of the inner cylinder to the top end of the inner cylinder, and the crushing part crushes the chilies while rotating, so that multiple operations in the same equipment are realized, the space occupied by the equipment is saved, and the cost of the equipment is reduced; and the production efficiency is further improved.

The invention concerns a short-path evaporator (SPE) (1), comprising a housing (2) with: at least one evaporation section (4, 28), configured to be kept at an evaporation temperature (T1), at least one condensation section (6, 29) associated with the at least one evaporation section, configured to be kept at a condensation temperature (T3), a main inlet (5) for feeding a liquid (26) to be distilled to the at least one evaporation section, a distillate collection device (7) for collecting condensed distillate (8) from the at least one condensation section, a distillate outlet (9) for removing the condensed distillate from the housing, and a main outlet (17) for removing residue (10) from the at least one evaporation section from the housing.

The invention relates to the technical field of tetramethyltin synthesis, in particular to a high-efficiency tetramethyltin synthesis process which comprises the following steps: S1, material selection and preparation: selecting corresponding raw materials according to tetramethyltin synthesis requirements, dividing the raw materials into main materials, auxiliary materials and additives, and subsequently weighing the raw materials by using a weighing device; s2, material pretreatment: adding the weighed main material into a dehydration device, starting the dehydration device to carry out dehydration treatment, detecting after dehydration is finished, and taking out the dehydrated main material when a detection result meets a standard; by introducing the double-stage design of low-temperature catalytic methylation and gradient heating reaction and combining a dimethyl sulfide catalytic system to replace a traditional iodine initiator and magnesium powder dynamic equilibrium mechanism, the reaction heat release rate is greatly reduced, the temperature in the whole reaction process is kept in a constant range, the material flushing or explosion risk caused by local overheating is thoroughly eliminated, and the product quality is improved. And intrinsically safe production is realized.

Methods and systems for separating a first metal from a metal-containing feed stream are provided. The method can include applying solar energy, for example, by focusing one or more mirrors in one or more heliostats, to heat a metal-containing feed stream in a heating zone to a first temperature to produce a first vapor including the first metal. The first vapor can be condensed in a condensation zone to produce a first liquid including the first metal, and the first liquid can be collected. The system can include a separation unit include a heating zone in fluid communication with a condensation zone and a means for applying solar energy to heat a metal-containing feed stream disposed in the heating zone.

The invention provides a continuous carbon removal and recovery system for heat-conducting oil, relates to the field of heat-conducting oil recovery, and comprises a heat-conducting oil pipe, a vacuum tower, a first condensing device and a reboiler, the heat-conducting oil pipe communicates with the interior of the vacuum tower; the first condensing device is arranged in the vacuum tower; the reboiler and the vacuum tower form a circulation loop through a connecting pipeline, a first circulation pump is connected to the circulation loop, the reboiler is used for heating the heat-conducting oil in the circulation loop, and a heat source inlet of the reboiler is communicated with the heat-conducting oil pipe. According to the continuous carbon removal and recovery system for the heat-conducting oil, the vacuum tower is arranged, and the condensing device is arranged in the vacuum tower, so that the fractionated qualified heat-conducting oil is separated from light components and heavy components. And the separated qualified heat-conducting oil returns to the lower tank of the heat-conducting oil system again, so that continuous carbon removal and recovery of the heat-conducting oil are realized on the premise of not influencing the operation of the existing heat-conducting oil system. A heat source is provided for the reboiler through the heat conduction oil system, and energy is saved.

The invention discloses a distillation separation mechanism and method of a cyanate ester synthesis reaction device, and belongs to the field of cyanate ester synthesizing.The mechanism comprises a distillation assembly, a first collection assembly for collecting cyanogen chloride and hydrogen chloride, a second collection assembly for collecting bisphenol compounds and a third collection assembly for collecting cyanate ester, in the second collection assembly, a second condensation pipe is connected between a second collection cylinder and the distillation cylinder, a second condensation cylinder is sleeved on the pipe, a sliding plate in the second collection cylinder is connected with a piston rod and an insertion rod, and a tension spring is arranged between the piston rod and a piston cylinder. Pressure passes through the branch pipe to enable the piston rod to move downwards, the sliding plate to descend, the volume of the communication space to descend, boiling is slowed down, the insertion rod moves downwards to enable the second collection barrel to ascend, the condensation pipe to incline and liquid drops to flow back, and the cyanate collection amount is ensured.

A reactor for coating particles includes a stationary vacuum chamber to hold a bed of particles to be coated, a chemical delivery system, and a paddle assembly. The paddle assembly includes a rotatable drive shaft and a first plurality of paddles and a second plurality of paddles that extend radially from the drive shaft. The spacing, cross-sections, and oblique angles of the paddles are such that orbiting of the paddles causes the first plurality of paddles and the second plurality of paddles to displace substantially equal volumes in opposite directions in the lower portion of the stationary vacuum chamber.

The invention discloses a vacuum distillation furnace filtering system which comprises a bottom plate, a central controller installed on the bottom plate, a vacuum equipment module installed on a supporting table, a vacuum distillation furnace fixedly connected to a supporting reinforcing frame, a vacuum gauge installed in the vacuum distillation furnace and a first temperature sensor installed in the vacuum distillation furnace. A pressure sensor is installed in the vacuum distillation furnace, a multi-layer filtering module is installed between the bottom plate and the discharging pipe, and a waste heat recovery module is installed between the bottom plate and the vacuum distillation furnace. Particles are dynamically separated through the multiple layers of filtering modules by means of centrifugal force, the blocking problem of traditional static filtering is avoided, meanwhile, the two filtering modules are divided through the discharging pipe to operate separately, filter element replacement without shutdown is achieved, and the shutdown maintenance time is shortened.

The utility model provides a six-tower thermal coupling refining device for crude methanol, which comprises a pre-rectifying tower, a normal-pressure rectifying tower, a negative-pressure rectifying tower, a medium-pressure rectifying tower, a pressurized rectifying tower I and a pressurized rectifying tower II, the tower top of the pre-rectifying tower is connected with a normal-pressure tower reboiler I, and the tower top of the normal-pressure rectifying tower is connected with a negative-pressure tower reboiler; the top of the medium-pressure rectifying tower is connected with a pre-tower reboiler, the top of the pressurized rectifying tower I is respectively connected with a medium-pressure tower reboiler and a pressurized tower II reboiler, and the top of the pressurized rectifying tower II is connected with an atmospheric tower reboiler II; in the application, methanol steam at the top of a pressurized rectifying tower I provides heat for a medium-pressure rectifying tower and a pressurized rectifying tower II; methanol steam at the top of the medium-pressure rectifying tower provides heat for the pre-rectifying tower; top steam of the pre-rectifying tower and top methanol steam of the pressurized rectifying tower II provide heat for the normal-pressure rectifying tower; the tower top steam of the normal-pressure rectifying tower provides heat for the negative-pressure rectifying tower; the steam at each tower top is utilized, and the unit consumption of the methanol rectification process is 0.36-0.50 t steam / t refined alcohol.

The present invention relates to the field of organic synthesis, and discloses a synthesis process of diacetone acrylamide, comprising the following steps: S1: first adding concentrated sulfuric acid into a reactor, then dripping a mixture of acrylonitrile and diacetone alcohol while stirring, then heating the system temperature to 40-48°C, reacting for 4-4.5h, and obtaining a mixed solution; S2: cooling the mixed solution in S1 to 12-15°C through a cooling device, and then slowly adding the mixed solution into 25% ammonia water, controlling the temperature at 25-30°C during the liquid addition process, and adjusting the pH to 7.6-8 after the liquid addition is completed. The process flow of the present invention is operated by two steps of water extraction and salting out, respectively removing most of the organic and inorganic impurities, and removing most of the acrylamide by alkali solution washing, so that the mother liquor of the reduced pressure distillation contains only a small amount of impurities, no polymerization reaction occurs during the distillation process, and the product obtained after the distillation is relatively pure, no recrystallization is required, the yield is stable, and it is good for the environment.

The utility model discloses a vacuum generating device for producing water-based resin, which comprises an evaporator, an evaporation mechanism for improving the evaporation efficiency is arranged in the evaporator, the evaporation mechanism comprises a rotary material distribution disc, a scraper blade, a feeding pipe, a steam pipe, an interlayer and a heating pipe, the rotary material distribution disc is movably arranged in the middle of the inner side of the evaporator through a rotating shaft, and the scraper blade is arranged on the rotating material distribution disc. A plurality of scrapers are evenly and fixedly arranged on the outer side surface of the lower end of the rotary material distribution disc, and a feeding pipe is fixedly arranged on one side of the surface of the evaporator. During evaporation, the motor can drive the scraper to rotate, so that materials can be uniformly and flatly spread on the inner side wall of the evaporator, and only a thin layer of materials is evaporated every time, so that the evaporation efficiency can be greatly improved, rapid evaporation, concentration and separation of the materials are realized, and the desolventizing efficiency is improved; in addition, the materials are uniformly heated in the equipment and quickly evaporated and stay for a short time, so that the product quality can be effectively maintained.

The invention discloses traditional Chinese medicinal material extraction equipment which comprises a heating tank, an evaporation tank and a purification tank, the evaporation tank and the purification tank are in a negative pressure state, the evaporation tank is arranged in the heating tank, the purification tank and the evaporation tank are fixed through a connecting seat, the evaporation tank and the purification tank are connected through a siphon, a steam conveying pipe is arranged on the evaporation tank, and the purification tank is connected with the evaporation tank through a siphon. A condensing pipe is arranged at the top of the purification tank, the bottom end of the condensing pipe extends into the purification tank, the end part of the steam conveying pipe is communicated with the condensing pipe, a plurality of ultrasonic generators are arranged on the inner wall of the purification tank, a filter cartridge for storing traditional Chinese medicinal materials is arranged in the purification tank, and a discharging pipe is arranged at the bottom of the heating tank; the traditional Chinese medicinal material extraction equipment can circularly extract traditional Chinese medicinal materials, so that the extract is concentrated, the extraction process is isolated from the outside, the pollution of the external environment to the extract is avoided, the overall structure is safe and efficient, and the equipment is suitable for popularization and use.

The utility model provides a novel vacuum buffer tank for a reduced pressure distillation device, which relates to the field of distillation devices and comprises a tank body, a pressure pipe is mounted at the upper end of the tank body and is used for being connected with an external distillation device, a fixed disc A is fixedly connected in the tank body, two exhaust ports A are formed in the fixed disc A, and the exhaust ports A are communicated with the tank body. And a fixed disc B is slidably connected into the tank body. According to the novel vacuum buffer tank for the reduced pressure distillation device, through the arranged fixing disc B, when the air pressure in the tank body is increased, a spring A can play a buffering role to prevent the tank body from being damaged due to too large pressure, through the arranged two alarm mechanisms, when the air pressure reaches a preset value, one alarm mechanism can give an alarm, and when the air pressure is too large, the alarm mechanism can give an alarm. The two alarm mechanisms can give an alarm at the same time to remind workers, and the workers are prevented from continuously climbing to the top of the buffer tank to check the pressure gauge to prevent danger caused by excessive pressure.

The utility model relates to a negative-pressure crude benzene distillation system adopting a tubular furnace for heating. The negative-pressure crude benzene distillation system comprises a debenzolization tower, the tubular furnace and a crude benzene condensing, cooling and separating integrated device, the debenzolization tower is sequentially provided with a rectifying section, a stripping section, a storage tank section and a regeneration section from top to bottom; the crude benzene condensing, cooling and separating integrated device comprises a heat exchange tower and a separating tank; a low-temperature water heat exchanger is arranged at the lower part of the heat exchange tower; a crude benzene collecting section, an oil-gas-water separating section and a water collecting section are arranged in the separating tank; a first heating section and a second heating section are arranged in the tubular furnace. Compared with an existing negative-pressure crude benzene distillation process system, the negative-pressure crude benzene distillation process system has the remarkable advantages that the tail gas output is low, the tail gas is not discharged, the tube furnace operation temperature is low, the washing oil consumption is small, no additional separated water is generated, the one-time investment is low, and the like.

The present disclosure relates to methods for petrochemical production integrating a slurry phase hydrocracking process and an inline hydrotreating process. A slurry-phase hydrocracking feed comprising residue stream and / or a deasphalted residue stream is processed in a slurry-phase hydrocracking reaction zone to produce slurry-phase hydrocracking effluents. A first stream of slurry-phase hydrocracking effluents is discharged including unreacted hydrogen and which is under hydrogen partial pressure. The slurry-phase hydrocracking effluents are processed in an inline hydrotreating zone for hydrodesulfurization and / or hydrodenitrogenation to produce a hydrotreated effluent. Downstream FCC and petrochemicals production complex units are used to produce light olefins and aromatic products.

The utility model discloses a fractionating tower, which relates to the technical field of fractionating equipment and comprises an alloy tower body and a filler block, one side of the alloy tower body is connected with a discharge pipe fitting in a penetrating manner, the top end of the alloy tower body is connected with a material injection pipe fitting in a penetrating manner, and a positioning mechanism is arranged in the alloy tower body. The positioning mechanism is used for positioning the bottom ends and the top ends of the filler blocks with different sizes so as to meet the use requirements of quick disassembly and distance adjustment of the filler blocks with different sizes, a flow dividing mechanism is arranged under the filler blocks, and the flow dividing mechanism is used for carrying out flow dividing treatment on liquid filtered by the filler blocks, so that the use requirements of quick disassembly and distance adjustment of the filler blocks with different sizes are met. And therefore, blockage of the liquid in the alloy tower body in the flowing process of the liquid is avoided. The supporting bases arranged on the two sides vertically ascend and descend on the outer sides of the vertical guide plates, then the distances of the multiple sets of filler are adjusted, dynamic balance can be kept between the first filler plate and the second filler plate during mass transfer, the first filler plate and the second filler plate are prevented from deforming, and the service life of the filler is prolonged.

The invention relates to a method for extracting and separating polyether polyol in waste salt slag by a water-based method, and belongs to the technical field of separation and purification. The method comprises the following steps: (1) slurrying extraction: mixing polyether polyol salt slag with water according to a certain mass ratio, and carrying out slurrying extraction under a stirring condition to obtain oil-water-salt mixed slurry; (2) performing centrifugal separation to obtain an oil-water mixture rich in polyether polyol; (3) demulsifying and layering to obtain a polyether polyol phase; and (4) refining and purifying: dehydrating the polyether polyol phase to obtain a recycled polyether polyol product. According to the method, water is used as an extraction solvent, so that the use of toxic and flammable organic solvents is completely avoided, the safety and health hidden dangers are fundamentally eliminated, and secondary organic pollution is avoided. By optimizing parameters such as the temperature and the liquid-solid ratio of extraction water and combining centrifugal separation, the polyether polyol can be efficiently extracted and separated from the thick salt slag, and the recovery rate can reach 95% or above.

This application provides a five-tower thermally coupled refining apparatus for crude methanol, comprising a pre-distillation tower, an atmospheric distillation tower, a medium-pressure distillation tower, a pressure distillation tower I, and a pressure distillation tower II connected in sequence. The top of the pre-distillation tower is connected to the reboiler of the atmospheric distillation tower I, the top of the medium-pressure distillation tower is connected to the reboiler of the pre-distillation tower, the top of the pressure distillation tower I is connected to the reboilers of the medium-pressure distillation tower and the reboiler of the pressure distillation tower II, and the top of the pressure distillation tower II is connected to the reboiler of the atmospheric distillation tower II through a top outlet pipeline of the pressure distillation tower II. In this application, the top steam of the pressurized distillation column one provides heat to the medium-pressure distillation column and the pressurized distillation column two. The top steam of the medium-pressure distillation column provides heat to the pre-distillation column. The top steam of the pre-distillation column and the pressurized distillation column two provide heat to the atmospheric distillation column, thus making full use of the heat at the top of each distillation column. Through this application, the unit consumption of the methanol distillation process can be reduced from 1.2t steam / t refined methanol to 0.50-0.60t steam / t refined methanol, achieving a significant reduction in energy consumption.