33 results about "Continuous distillation" patented technology

Embodiments of systems and methods for enhancing control of a distillation operation are disclosed. The method includes obtaining data for a plurality of ongoing and continuous distillation operations from one or more of (a) a plurality of sensors or (b) a plurality of analyzers configured to analyze fluid output via the distillation operations. The method may include determining one or more parameters for each one or more of one or more distillation columns or distillation control devices based on application of the data to a machine learning model. The method may include in response to determination of the one or more parameters, operating each of the one or more distillation columns or distillation control devices based on the one or more parameters, thereby to enhance operation of the one or more distillation column.

The utility model belongs to the technical field of white spirit distillation, and particularly relates to continuous distillation equipment for multistage fractionation in a transition area. According to the continuous distillation equipment for multi-stage fractionation in the transition area, the multi-stage fractionation cover and the fractionation structure connected with the multi-stage fractionation cover are arranged between the foreshot steam collecting cover and the high-quality wine steam collecting cover or between the high-quality wine steam collecting cover and the after-run steam collecting cover, and the thermometer and the micromanometer in the fractionation structure are used for detecting wine gas parameter data in real time; the control module and the three-way switching valve are combined to precisely regulate and control the flow direction of the wine gas, so that the wine gas is selectively fractionated to the foreshot liquid collector, the high-quality wine liquid collector or the after-run collector, the problem of mixing and mixing of the wine gas among all sections of wine liquid collection in traditional equipment is effectively avoided, the fractionation precision is remarkably improved, and the fractionation efficiency is improved. The mixing rate of foreshot liquid, high-quality wine and after-run is greatly reduced, the problems of response lag and poor stability caused by manual operation are reduced, the distillation efficiency is improved, the wine quality is guaranteed, and the resource waste and the energy consumption cost are reduced.

The utility model relates to the technical field of chemical engineering, in particular to an energy-saving continuous distillation device which comprises a distillation box, a first supporting plate, a second supporting plate and a heat preservation cover are fixedly installed on the distillation box, a first filter box is installed on the first supporting plate, and a first pipeline matched with the distillation box and the heat preservation cover and used for conveying waste gas is arranged on the first filter box. A filter box II is mounted on the support plate II, and a pipeline II which is matched with the distillation box and is used for conveying the wastewater is arranged on the filter box II. The first filter box is arranged on the distillation box, impurities in waste gas are intercepted through the filter element, the intercepting cylinder, the filter cylinder, the filter cotton and the activated carbon layer in the first filter box, the waste gas is conveyed into the heat preservation cover after being filtered, and the heat preservation cover can conduct continuous heat preservation on the distillation box; the second filter box is arranged on the distillation box, the wastewater and the flocculating agent are stirred through the net blades in the second filter box, the wastewater can be filtered again through sand gravels, and then the surrounding environment is protected.

The utility model belongs to the technical field of white spirit distillation. According to the continuous distillation equipment capable of directly utilizing the after-run steam disclosed by the utility model, the after-run steam is directly recovered and is recycled after being pressurized and heated, so that dual energy loss in a traditional condensation-re-distillation process is avoided, after-run cooling water does not need to be preset, meanwhile, the heat energy consumption is reduced by 40%, and the production cost is greatly reduced. Ethyl acetate and other heat-sensitive components in the after-run do not need to be subjected to a re-steaming link, flavor loss is reduced, the recovery rate of ethyl acetate in the after-run is increased to 98% from 80%, the content of ethyl hexanoate in high-quality liquor is increased by 15%, and the aroma coordination and quality stability of the liquor are effectively guaranteed. And after-run steam compression and cyclic utilization functions are integrated, a traditional liquid storage tank, a pumping system and re-steaming equipment are omitted, and the equipment investment and maintenance cost are reduced. The condensation liquid of the after-run part and the uncondensed wine steam are uniformly converted into saturated wine steam for recycling through the compression equipment, closed-loop recycling of after-run components is achieved, waste is avoided, and the utilization rate of raw materials is increased.

The utility model discloses an automatic white spirit distilling machine, relates to the field of white spirit production, and aims to solve the technical problems that distilled white spirit raw materials on a steamer can be unloaded only after the steamer is lifted up and moved out through a crane after the existing steamer is used for distilling the white spirit raw materials in the prior art. The continuous distillation operation efficiency of the white spirit raw materials is relatively low. Rectangular openings are formed in the upper ends of the middles of the two sides of the steamer pot and the upper ends of the middles of the front end and the rear end of the steamer pot, a rectangular movable cover is fixedly connected to the position, on the outer side end face of the steamer pot, of the outer side of each rectangular opening, a steamer body is arranged in the middle of the interior of the steamer pot, and rectangular lifting plates are fixedly connected to the middles of the two sides of the steamer body; hydraulic rods are fixedly connected to the upper end face of the bottom plate and located on the two sides of the steamer pot, the hydraulic rods drive the steamer to ascend and descend, quick discharging of distilled liquor raw materials is achieved, secondary lifting through a crane is not needed, the production efficiency is remarkably improved, and the labor cost is reduced.

This utility model provides a continuous distillation system for honeysuckle juice, relating to the field of honeysuckle distillation. It includes: a distiller, a permeable bed within the distiller, a drive motor fixed to the top of the distiller, a rotating shaft fixed to the output shaft of the drive motor, a sleeve fitted onto the outer wall of the rotating shaft, and two rotating plates with open bottoms. In this system, when honeysuckle is spread on the permeable bed for distillation, the drive motor simultaneously rotates the rotating shaft, which in turn rotates the sleeve, which in turn rotates the rotating plates. The rotating plates then rotate the connecting plate and the comb teeth. Simultaneously, the elasticity of the spring causes the connecting plate to move elastically, which in turn causes the comb teeth to move elastically, causing them to come into contact with the honeysuckle on the permeable bed. Thus, the rotation of the comb teeth agitates the honeysuckle on the permeable bed, facilitating thorough distillation and improving the distillation effect.

The invention discloses a preparation method of electronic-grade epoxy resin, and relates to the technical field of epoxy resin, and the preparation method comprises the following steps: S1, preparing and mixing raw materials: according to detection data of total chlorine in the epoxy resin, preparing a dechlorinating agent with corresponding metering, and uniformly mixing the epoxy resin and the dechlorinating agent; s2, heating reaction: heating the mixed material under the protection of nitrogen, and removing low-boiling-point substances at the same time; s3, molecular distillation separation: continuously distilling to obtain low-total-chlorine target resin, and removing chlorine-containing polymer impurities out of the system in a kettle residue form; and S4, product collection and detection. According to the preparation method of the electronic-grade epoxy resin, the chlorine removal agent is accurately metered and uniformly mixed with the epoxy resin, the mixture is heated and reacted under the protection of nitrogen, low-boiling-point substances and chlorine-containing impurities are effectively removed, continuous distillation is performed by utilizing a molecular distillation technology, low-total-chlorine target resin is further successfully separated, and the total chlorine content in the epoxy resin is remarkably reduced.

The invention belongs to the field of preparation of hydroxybutyl acrylate by a continuous rectification device, and particularly relates to a hydrophobic mesoporous confinement type Sn < 2 + >-SO3H double-acid-site magnetic polymer solid acid catalyst as well as a preparation method and application of the hydrophobic mesoporous confinement type Sn < 2 + >-SO3H double-acid-site magnetic polymer solid acid catalyst. The invention synthesizes a hydrophobic mesoporous confinement type Sn < 2 + >-SO3H double-acid-site magnetic polymer solid acid catalyst Fe3O4 (at) mP (St-FD-Sn)-SO3H, the catalyst integrates two different catalytic active centers (Sn with Lewis acidity and-SO3H with Bronsted acidity), the catalyst has a better catalytic effect, and the ester exchange reaction can reach a higher yield. Compared with the traditional purification method that rectification purification is carried out after continuous extraction, the method adopting continuous rectification for product purification has the advantages that the introduction of an extracting agent is reduced, the product is purer in quality and higher in yield, and the production cost is obviously reduced.

The invention relates to a method and a device for continuously distilling white spirit through nitrogen closed circulation segmented stripping and multi-stage liquor picking, which are characterized in that closed circulation nitrogen is used as a carrier to perform white spirit distillation, graded liquor picking and total condensate recovery, so that a waste-free process is realized; carrier gas circulation is driven by a nitrogen expansion / compressor unit, heat / cold is supplied to push evaporation / condensation heat and mass transfer, and the process is low-carbon and efficient; the continuous white spirit distillation process of continuous feeding and continuous discharging of fermented grains is realized through the semi-closed automatic feeding / discharging device and the rotary half-tube combined tray. By adopting the technology provided by the invention, the high-degree white spirit is prepared by continuously distilling the fermented grains with the moisture content of 60% and the ethanol content of 6%, and the distillation energy consumption of a unit product (folded into pure ethanol) is 0.98 kWh (electricity) / 1kg of ethanol, so that the technology has great significance on high-quality and low-carbon development of the solid fermented wine industry.

Embodiments of systems and methods for enhancing control of a distillation operation are disclosed. The method includes obtaining data for a plurality of ongoing and continuous distillation operations from one or more of (a) a plurality of sensors or (b) a plurality of analyzers configured to analyze fluid output via the distillation operations. The method may include determining one or more parameters for each one or more of one or more distillation columns or distillation control devices based on application of the data to a machine learning model. The method may include in response to determination of the one or more parameters, operating each of the one or more distillation columns or distillation control devices based on the one or more parameters, thereby to enhance operation of the one or more distillation column.

The utility model discloses a continuous distillation device in MCPP propionic acid production, which comprises a base as well as a distillation tower and a condensing tower which are arranged on the base, and further comprises a dispersion component which is arranged in the distillation tower and is used for dispersing discharged MCPP propionic acid mixed liquor, and the dispersion component comprises a fixed ring which is fixedly connected to the inner wall of the distillation tower, the fixing ring is located above the tower plate, the side, away from the tower plate, of the fixing ring is connected with a dispersion hollow ring through a positioning assembly, and the ends, close to each other, of the two corrugated pipes are fixedly connected with an L-shaped liquid outlet pipe. According to the utility model, through the arrangement of the dispersing assembly, the MCPP propionic acid mixed solution flows to the tower plate at different positions, so that the discharging uniformity of the MCPP propionic acid mixed solution is improved, and the risk of local accumulation or bias flow on the tower plate due to higher viscosity and single discharging position of the MCPP propionic acid mixed solution is reduced.

The invention provides a hydrogen chloride rectification tank, a hydrogen chloride rectification method and a high-purity hydrochloric acid preparation system, and belongs to the technical field of high-purity hydrochloric acid preparation. The hydrogen chloride rectification tank comprises a rectification outer tank and a baffling distillation assembly. The hydrogen chloride rectification method is implemented based on a hydrogen chloride rectification tank. The high-purity hydrochloric acid preparation system comprises the hydrogen chloride rectification tank. The continuous distillation process of crude hydrochloric acid baffling preheating, distillation and hydrogen chloride release-hydrogen chloride dissolution to form secondary hydrochloric acid-secondary hydrochloric acid baffling preheating, secondary distillation and hydrogen chloride release can be realized, and heat in the crude hydrochloric acid baffling preheating and distillation processes is synchronously used for secondary hydrochloric acid preheating; meanwhile, the two distillation processes are both carried out in the rectification outer tank, only one inlet and one outlet are provided for the outside, no additional connecting structure is added, and the leakage risk of hydrogen chloride is low.

Systems and methods are provided for using high temperature heat pumps for recovering heat from chemical processes, and in particular, systems and methods are provided for operating heat pumps integrated into continuous distillation processes.

This utility model relates to the field of distillation column technology, specifically a high-efficiency and energy-saving distillation column with a protective mechanism. It includes a distillation column body, an isolation component for external protection located below the column body, a protective filter component for intercepting and filtering the added liquid located near the top on the left side of the column body, and a cleaning structure with an inner wall scraper at the top of the column body. The cleaning structure includes a main shaft connected to a motor and its output shaft, with a scraper plate at the end of the main shaft. This high-efficiency and energy-saving distillation column with a protective mechanism, by combining the isolation component with the column body for external protection, and the partition plate dividing the interior of the filter box into a sedimentation chamber and a filtration chamber, allows the added solution to pass through a sedimentation chamber and a filter with absorbent cotton, intercepting and filtering particulate matter in the solution. The motor and main shaft, along with the scraper plate, scrape the inner wall of the distillation column body, reducing material adhesion and coking on the inner wall, thus minimizing impact on continuous distillation.

This utility model relates to the field of extraction equipment technology, and in particular to a device for continuous distillation of disperse dye mother liquor to recover methanol and DMAC. The device includes a methanol extraction unit, a DMAC extraction unit, a condenser, and a methanol storage tank. The methanol extraction unit has an inlet pipe, an outlet pipe, and a vaporized methanol flow pipe. The output end of the vaporized methanol flow pipe is connected to the shell-side inlet end of the condenser. A liquefied methanol flow pipe is installed on the shell-side outlet end of the condenser, and its output end is connected to the methanol storage tank. A first reflux pipe is installed in the middle section of the liquefied methanol flow pipe and is connected to the inlet pipe. The methanol storage tank has a second reflux pipe, the output end of which is connected to the first reflux pipe. The output end of the outlet pipe is connected to the DMAC extraction unit. Through the cyclic extraction and purification loop of the methanol extraction unit, condenser, and methanol storage tank, the methanol recovery rate and purity are improved.

The utility model relates to a feeding device of a system for continuously distilling and purifying crude indium, aiming at solving the problems of low efficiency, oxidation film pollution and impurity accumulation in the traditional batch distillation. The device comprises a distillation furnace, a raw material furnace and a material conveying pipe, seamless connection between normal pressure of the raw material furnace and vacuum of the distillation furnace is realized through a pressure difference self-driven feeding structure, and shutdown cooling is avoided. The bottom of the raw material furnace is provided with a suction groove, the top is additionally provided with a filter ring to intercept an oxide film in real time, micro-positive pressure protection is formed in cooperation with nitrogen purging, and non-metal impurities such as O and C are reduced. The double-circulation parallel mode enables the melting time of the raw material furnace and the working time of the distillation furnace to be overlapped, and the single-batch interval time is shortened. The design of conveying pipe heating and kettle body heat preservation reduces energy consumption, and a circulating water system is optimized to prolong the service life of the crucible. According to the device, the whole process of distillation-feeding-pretreatment is continuous, the purity of finished indium is high, the utilization rate of equipment is improved, and the device is suitable for the production field of high-purity indium such as semiconductors and ITO (Indium Tin Oxide) target materials.

The invention provides a full-automatic continuous distillation instrument and relates to the technical field of substance component analysis. The device specifically comprises a detection unit and a sample injector. The detection unit comprises a first frame body, and a distillation subassembly, a heating subassembly, an overturning subassembly, a cleaning subassembly, a receiving subassembly, a first liquid adding subassembly and a detection subassembly are arranged on the first frame body. A condenser and a distillation pipe of the distillation subassembly can move up and down, the overturning subassembly is used for driving the distillation flask to overturn, and the heating subassembly comprises a heating device capable of moving up and down. The receiving subassembly comprises a rotatable first workbench, a receiving bottle is arranged on the first workbench, and a receiving station of the receiving subassembly is located under the condenser. The sample injector comprises a rotatable second working table, and a sample bottle is arranged on the second working table. The sample injection part comprises a sample injection pipe capable of moving up and down and horizontally, and the sample injection pipe is connected with a sample injection pipe of the first liquid injection subassembly through a sample injection pump. The distillation instrument can meet the high-efficiency detection requirement of a large batch of samples.

The present invention discloses a method and apparatus for purifying ultra-high purity hydrogen fluoride, which purify it through a continuous distillation process by putting crude hydrogen fluoride instead of hydrogen fluoride into a multi-stage distillation column as it is, and remove impurities in hydrogen fluoride through a contact with fluorine gas having the concentration of the F2 gas automatically controlled depending on the content of arsenic fluoride that is an impurity.

The utility model discloses a rosin continuous distillation device, which belongs to the technical field of rosin processing, and comprises an outer tank body, a discharge pipe arranged at the lower end of the outer tank body, an inner tank body fixed inside the outer tank body, two steam guide pipes arranged between the inner tank body and the outer tank body, and a gas guide pipe fixed on the upper side of one end of the inner tank body, a cooling tank is fixed to the other end of the gas guide pipe, a cooling coil is arranged in the cooling tank, a circulating assembly is arranged on one side of the cooling tank, and a cleaning assembly is arranged in the inner tank body; the cleaning assembly is arranged, the motor is started to drive the rotating shaft to rotate, the rotating shaft rotates to drive the transverse rod to rotate, the transverse rod rotates to drive the scraping frame to rotate to clean the inner wall of the inner tank body, the cleaning assembly is arranged to clean the inner wall of the inner tank body, and impurities or oxide layers are prevented from being attached to the inner wall of the inner tank body after the inner tank body is used for a long time. Therefore, the subsequent heating efficiency of the steam conduit in the inner tank body is influenced.

The application discloses a nitromethane continuous distillation device, and relates to the technical field of nitromethane separation.The application has the advantages that the distillation device body is provided with an outer cylinder and an inner cylinder connected in sequence from the outside to the inside at the rear end of the distillation device body, a jacket is connected to the outer wall of the outer cylinder, and a hollow roller shaft is rotatably connected to the inner wall of a through hole in the middle of the distillation device body.The device adopts a double heating mode, significantly improves the uniformity of material heating, continuously rotates an auger to push the axial transmission of the material, realizes continuous feeding, continuous distillation and continuous discharging, and the spiral blades rotate synchronously with the inner cylinder to continuously scrape off the impurities on the inner wall of the outer cylinder, so that the heat conduction surface is kept clean and uniform, and the product purity and production stability are improved.The application effectively solves the problems of low intermittent operation efficiency, uneven heating and inner wall scaling of the existing nitromethane distillation device, realizes the continuous production of nitromethane, and has important industrial application value.

The utility model discloses a chemical raw material preparation distillation device, and belongs to the technical field of chemical distillation equipment. The device mainly comprises a distillation retort, a sealing cover is hinged to the distillation retort, an air outlet pipe is arranged on the sealing cover, the air outlet pipe is communicated with a filtering mechanism, the filtering mechanism comprises a support installed on the distillation retort, two sets of filtering cylinders are arranged on the support, the two sets of filtering cylinders are arranged in parallel, and the two sets of filtering cylinders are each provided with an inlet and an outlet. The air outlet pipe is communicated with an input pipe, the input pipe is provided with a first valve, the first valve is respectively communicated with the inlets of the two groups of filter cartridges, the output pipe is provided with a second valve, and the second valve is respectively communicated with the outlets of the two groups of filter cartridges. According to the distillation device for preparing the chemical raw materials, the two groups of filtering mechanisms connected in parallel are arranged, so that one group of filtering mechanisms can be alternately used according to conditions in the distillation process, and continuous distillation operation of the chemical raw materials can be better matched.

A phosphorus trifluoride (PF3) using a continuous distillation column, according to the present invention, utilizes: a first distillation column in which a mixture containing at least a portion of PF3 is distilled to discharge PF3, HCl, HF, PCl3, and acetonitrile from the column bottom and discharge a mixture of PF3, HCl, and N2 from the column top; a second distillation column in which the mixture of PF3, HCl, and N2 is distilled to discharge PF3 and HCl from the column bottom and discharge the mixture of PF3 and N2 from the top column; and a third distillation column in which the mixture of PF3 and N2 is distilled to discharge PF3 from the column bottom and discharge N2 from the column top.

The utility model belongs to the technical field of white spirit distillation, and particularly relates to multi-section type steam distribution continuous distillation equipment. According to the multi-section steam distribution continuous distillation equipment disclosed by the utility model, the fermented grain conveying mechanism adopts a double-layer conveying structure formed by adding the metal wire braid layer on the surface of the conveying belt, and the metal wire braid layer is elastic and can be tightly attached to the outer surface of the conveying belt in a wrapping manner, so that the uniformity of steam distribution is remarkably improved; the local temperature difference of the fermented grains is reduced from + / -10 DEG C to + / -1.5 DEG C, and meanwhile, the materials are effectively prevented from blocking steam holes, the heated uniformity of the fermented grains is enhanced, and the distillation efficiency and the vinosity stability are improved.

The invention discloses a cadmium semi-continuous distillation furnace and method, and relates to the technical field of cadmium purification, the cadmium semi-continuous distillation furnace comprises a distillation furnace main body, a backing material collection mechanism, a material melting mechanism, a tailing collection mechanism, a finished material collection mechanism and a head material collection mechanism; the distillation furnace main body comprises an evaporation structure and a distillation column, the distillation column is arranged at the top of the evaporation structure and detachably connected with the evaporation structure, and the distillation column is communicated with the evaporation structure; the bottom material collecting mechanism is arranged at the bottom of the evaporation structure, the bottom material collecting mechanism is communicated with the evaporation structure, the material melting mechanism, the tailing collecting mechanism, the finished product material collecting mechanism and the head material collecting mechanism are sequentially arranged on the outer side of the distillation column from bottom to top, and the material melting mechanism, the tailing collecting mechanism, the finished product material collecting mechanism and the head material collecting mechanism are respectively communicated with the distillation column. The problems that an existing traditional single-operation type cadmium distillation furnace is low in production efficiency, cannot adapt to switching of vacuum distillation and normal-pressure charging and discharging working conditions and lacks a modular grading collection structure are solved.

The invention discloses an intermittent and continuous operation switchable rectification system and method and a switching method, and the system comprises a rectification core unit which comprises a rectification kettle and a rectification column; the tower top condensation system comprises a first-stage condenser and a second-stage condenser, the first-stage condenser is used for carrying out main condensation and backflow on tower top steam, and the second-stage condenser is used for condensing light components which are not condensed by the first-stage condenser; the feeding system comprises a feeding pump and a feeding flow meter; the tower top extraction system comprises a product extraction pipeline and a light component extraction pipeline, a product flowmeter is arranged on the product extraction pipeline, and a light component flowmeter is arranged on the light component extraction pipeline; the tower kettle extraction system comprises a heavy component discharge pump and a heavy component flowmeter and is used for controlling extraction of heavy components in the tower kettle; and the control system is configured to enable the system to selectively operate in a batch rectification mode or a continuous rectification mode by cooperatively controlling the opening, closing and flow of the feeding pump and the heavy component discharging pump.

The utility model discloses a continuous distillation device for harmless treatment of phosphorus sludge, and relates to the technical field of phosphorus recovery devices. Comprising a continuous distillation device and a multistage phosphorus recovery device, the top of the continuous distillation device is provided with a material conveying mechanism, the material conveying mechanism comprises a barrel body, the bottom of the barrel body is fixedly provided with a feeding pipe, a pipe body of the feeding pipe is connected with a first material valve, and the top of the barrel body is movably connected with a first rotating shaft and a rotating drum. The continuous distillation device is provided with the first rotating shaft, the rotating drum, the dispersing rod, the driving mechanism and the anti-oxidation mechanism, the rotating drum drives the dispersing rod to stir and disperse phosphorus sludge in the barrel body when rotating, and air in the barrel body and bubbles in the phosphorus sludge is pumped away through the anti-oxidation mechanism, so that the air is effectively prevented from entering the continuous distillation device, and the service life of the continuous distillation device is prolonged. And the product purity is improved.

The utility model relates to distillation equipment technical field discloses a kind of triazole continuous distillation purification device, including distillation kettle body, and the heating jacket is fixedly connected with the outside of distillation kettle body, and the discharge valve is fixedly connected with the lower end of distillation kettle body, and the distillation kettle body in the position above heating jacket is fixedly connected with first support and second support respectively, and motor is fixedly connected on second support, and motor is electrically connected with external main control unit, and the filler is fixedly connected on second support, and the output end of filler is connected with the interface on distillation kettle body by pipeline and intercommunication, and the top center position of distillation kettle body is fixedly connected with shaft seat. The synergistic effect of turnover cylinder, internal propeller blade and top inverted conical distribution plate can continuously transport the deep layer material in kettle upward and spread open in circumferential direction, greatly increase the vaporization contact area of material, can effectively improve the conversion efficiency of triazole from liquid phase to gas phase, increase the output of gas phase triazole.

The utility model discloses a kind of cosmetic fermentation oil raw material continuous distillation device, it is related to cosmetic processing technical field.The cosmetic fermentation oil raw material continuous distillation device, including distillation device and cleanable waste heat recycling component, cleanable waste heat recycling component includes cover, filter box, communicating pipe, coil pipe, motor B, rotating rod, scraper and filter plate, cover is fixedly connected at the top of distillation device, filter box is fixedly connected at the top of cover, communicating pipe is fixedly connected at the top of filter box, coil pipe is fixedly connected at the outer surface of distillation device, coil pipe is fixedly connected with communicating pipe, motor B is fixedly connected at the top of cover, rotating rod is fixedly connected at the output end of motor B, scraper is fixedly connected at the bottom of rotating rod, by the cooperation of scraper and filter plate in cleanable waste heat recycling component Automatic cleaning impurity, reduce maintenance frequency, improve distillation continuity and product purity.

This invention discloses a method and apparatus for controlling the process and performing online automatic detection in the refining of crude phenol. The method includes separating the crude phenol raw material using a continuous distillation system, then feeding it into a batch distillation system for further refining using chemical treatment; using a sample sampling circulation system to collect the top distillate from each distillation column in real time, and sending it to a sample detection and analysis circulation system and an automatic pigment detection device for online analysis; and using a DCS control system to automatically adjust the reflux ratio and yield of the distillation columns based on feedback data on component content, moisture content, and color. The apparatus consists of a sample sampling circulation system, a sample detection and analysis circulation system, an automatic pigment detection device, and a DCS control system. This invention achieves precise separation of crude phenol components through the coupling of chemical treatment and distillation processes and closed-loop control throughout the entire process, improving product purity, yield, and color stability, while reducing production safety risks.

This invention discloses a method for preparing methyl ethyl carbonate and diethyl carbonate via transesterification under ambient temperature and pressure. Using dimethyl carbonate and ethyl acetate as raw materials, and sodium methoxide or sodium ethoxide as a catalyst, the raw materials are continuously added to a reaction vessel at 5-25℃ and 0.1MPa±0.02MPa. The stirring rate is 50-100 r / min, the temperature fluctuation is ≤±1℃, and the material residence time is 5-30 minutes, reaching reaction equilibrium when the dimethyl carbonate conversion rate fluctuation is ≤±0.5%. After the reaction, the generated Na₂CO₃, NaHCO₃, and CH₃COONa mixed solids are removed by vacuum filtration, pressure filtration, or centrifugation. The equilibrium liquid is sent to a continuous distillation column for separation and purification through multi-column distillation to obtain methyl ethyl carbonate and diethyl carbonate. Unreacted raw materials are recycled, and the byproduct methyl acetate is sold as a chemical product. This invention features mild reaction conditions, low equipment requirements, high reaction efficiency, low energy consumption, simple separation, no azeotropic interference, high resource utilization, and is suitable for continuous production.