28results about How to "Reduce efflux" patented technology

The invention discloses a method for preparing hexamethylenediamine through nitrile hydrogenation, which comprises the following steps: carrying out hydrogenation reaction on adiponitrile to obtain reaction liquid, and then carrying out post-treatment to obtain the hexamethylenediamine, wherein the hydrogenation reaction system further comprises an adsorbent and mother liquor generated in the post-treatment process. According to the method, the mother liquor containing impurities such as azaheptyl ring Schiff base and nitrile hydrolysis ammoniation byproduct amide is returned to the reactor, and the adsorbent is added in the reaction, so that compared with a production process in which the mother liquor is not recycled, the content of the reaction byproduct AMCPA can be reduced to 5 mg / kg or below, and the polarogram value of the hexamethylenediamine product is smaller than or equal to 20 mmol IB / t-HMD.

The application belongs to the technical field of biology, and discloses a Yarrowia lipolytica engineering strain for efficiently producing eicosapentaenoic acid based on citric acid metabolism regulation, a method and application, wherein a chassis strain of the engineering strain is Yarrowia lipolytica Po1f, and genes of Δ9 elongase, Δ8 desaturase, Δ5 desaturase and Δ17 desaturase in a fatty acid synthesis pathway, a heterologous ATP-citrate lyase and a mitochondrial citrate carrier are overexpressed. ATP-citrate lyases and mitochondrial citrate carrier genes respectively derived from Schizochytrium sp. and Saccharomyces cerevisiae are combined to be expressed in the Yarrowia lipolytica engineering strain, so that the production of EPA and oil in the Yarrowia lipolytica engineering strain is significantly improved, and compared with a control strain, the production of oil and EPA is respectively increased by 243.35% and 161.85%.

The present invention proposes a high-temperature pyrolysis and multi-oxygen incineration treatment process and system for medical waste. The process freezes and crushes the medical waste, and then screens it. During the screening, inorganic substances are separated and discharged after sterilization; the remaining organic substances are reverse-burned and gasified for multi-oxygen incineration; the generated gasification gas is firstly used for waste heat utilization, and the low-pressure steam generated by the waste heat utilization is used for medical institutions, and the low-temperature flue gas generated is used for reflux to adjust the oxygen-rich concentration of reverse-burning gasification and multi-oxygen incineration; the solid products of reverse-burning gasification and multi-oxygen incineration are treated with ash; the oxygen during reverse-burning gasification and multi-oxygen incineration is supplied by the surplus oxygen in the liquid oxygen production link. The process system of the present invention has the characteristics of distributed miniaturization, rapid start and stop, and can be used at any time, and can be shut down at any time. It also rationally utilizes the surplus cold in the hospital's own liquid oxygen gasification, rationally utilizes energy, solves the oxygen demand for multi-oxygen incineration, and forms a comprehensive medical institution waste distributed comprehensive utilization system.

The invention relates to the technical field of waste liquid treatment, in particular to a self-adaptive pH amphoteric polymer-calcium salt compounded bentonite slurry rapid sedimentation treatment method. According to the method, a calcium salt working solution, a buffer working solution, an amphoteric polymer working solution and a functionalized calcium carbonate micro-powder dispersion solution are added in stages, and the stirring speed and time are accurately controlled, so that rapid sedimentation of the slurry is realized. The amphoteric polymer is formed by copolymerizing a plurality of monomers and has wide pH adaptability; the functionalized calcium carbonate micro powder is used as a weighting carrier to enhance the floc density. The method solves the problems of slow sedimentation, high supernatant turbidity and poor adaptability to water quality fluctuation in the traditional method, has the advantages of high sedimentation speed and high supernatant clarity, can be directly reused, and is suitable for bentonite slurry treatment in the fields of electric power engineering and the like.

This invention relates to the field of water pollution purification, specifically to a process for purifying and recycling industrial wastewater. The process provided by this invention induces the in-situ crystallization and precipitation of calcium and magnesium ions, primarily in the form of aragonite-type calcium carbonate, by adding a crystal form regulator to the wastewater. This replaces the traditional precipitation method using precipitants, fundamentally preventing the generation of secondary sludge. Simultaneously, a quencher regulates the type and concentration of active free radicals within the system, achieving targeted degradation of organic matter while maximizing the retention of beneficial ions in the water, ensuring the corrosion inhibition performance of the recycled water. This invention features a simple operation, requires no mechanical structural modifications, and can be directly adapted to existing industrial water treatment systems. It effectively solves the problem of simultaneously addressing hardness removal and organic matter degradation in circulating water wastewater treatment, significantly improving the purification and recycling efficiency of wastewater. The treated effluent can be directly reused in industrial circulating water systems.

The utility model discloses safe and reliable tail gas washing equipment which comprises a shell body and a fan, an airflow channel is formed in an inner cavity of the shell body, the airflow channel is communicated with an air inlet and an air outlet in the shell body, tail gas can enter through the air inlet and be discharged from the air outlet under the action of the fan, and the tail gas can enter the shell body through the air outlet. Spraying heads and rectifying plates are arranged in the air flow channel, the spraying heads are communicated with a water source and used for spraying washing tail gas, each rectifying plate comprises a plurality of through holes allowing the tail gas to penetrate through, the rectifying plates divide the air flow channel into a plurality of relatively independent cavities, the air flow channel comprises an upstream channel and a downstream channel, and the upstream channel is communicated with the downstream channel. The two ends of the upstream channel are provided with two first valves respectively, and the two first valves can control the upstream channel to be communicated with the downstream channel or the outside. The device is reasonable in structure, safe, reliable and convenient to maintain.

The application discloses a kind of carbon source recovery and water cycle control methods of kitchen waste leachate and municipal sewage, and it relates to wastewater treatment technical field, the method includes: kitchen waste leachate is sent into hydrolytic acidification unit after being removed slag, oil separation and homogenization;In the hydrolytic acidification process, volatile fatty acid, soluble chemical oxygen demand, pH and oxidation-reduction potential are obtained, and the ratio of volatile fatty acid and soluble chemical oxygen demand and its change rate are used to determine the taking time point of acidification product;The removed acidification product is detected oil, suspended solids, ammonia nitrogen, pH and flow, and the carbon source availability is calculated and divided into direct dosing grade, bypass domestication dosing grade and reflux reacidification grade;According to the nitrate load of municipal sewage biochemical system, total nitrogen effluent trend and carbon source availability, determine the dosing amount and dosing position;Thus realize the graded recovery of organic carbon source in kitchen waste leachate, low impact utilization and water recycling.

The utility model relates to a system for reducing the amount of regenerated tail gas of wet-type ammonia oxidation multi-stage desulfurization. The system comprises a multi-stage desulfurization system, in each stage of desulfurization system, the top of the regeneration tower is connected with the bottom of the regeneration tower through a regeneration circulating gas pipeline, and the regeneration circulating gas pipeline of each stage of desulfurization system is connected with the regeneration circulating gas pipeline of the next stage of desulfurization system through a corresponding middle tail gas pipeline; the regeneration recycle gas pipeline of the first-stage desulfurization system is additionally connected with a compressed air pipeline, and the regeneration recycle gas pipeline of the last-stage desulfurization system is additionally connected with a tail gas exhaust pipeline; or in each stage of desulfurization system, the regeneration gas pipeline at the top of the regeneration tower is respectively connected with a regeneration gas main pipeline, the regeneration gas main pipeline is respectively connected with the regeneration tower of each stage of desulfurization system through a regeneration circulating gas pipeline, and the regeneration gas main pipeline is additionally connected with a compressed air pipeline and an exhaust tail gas pipeline. According to the utility model, the emission of regenerated tail gas can be greatly reduced, and the follow-up treatment cost of the regenerated tail gas is reduced.

The application relates to the technical field of waste incineration flue gas treatment, in particular to a waste incineration flue gas heavy metal solidification system and method using fly ash in-situ modification, which comprises a quench tower and a dust removal structure, characterized in that the quench tower inlet is communicated with an incinerator, the quench tower outlet is communicated with the dust removal structure through a pipeline, a fly ash collection structure is arranged below the dust removal structure, the fly ash collection structure is connected with a fly ash modification structure which is used for modifying the fly ash, a fly ash spraying structure is arranged in the pipeline between the quench tower and the incinerator, the fly ash spraying structure is communicated with the fly ash modification structure, and the purpose of stably treating heavy metals in flue gas is achieved.

The application provides a cooling air heat circulation system of a ring cooler feeding hopper, which comprises a cooling pipeline, a ring cooler feeding hopper, a hot air pipeline and a main burner, the outlet end of the cooling pipeline is communicated with the ring cooler feeding hopper, a cooling fan is arranged on the cooling pipeline to guide the cooling gas into the ring cooler feeding hopper through the cooling pipeline, and the hot air pipeline is communicated with the ring cooler feeding hopper and the main burner respectively to guide the gas heated by the ring cooler feeding hopper into the main burner. By arranging the hot air pipeline, the high-temperature hot air cooled by the ring cooler feeding hopper can be introduced into the main burner to participate in combustion, the energy waste caused by the direct discharge of the high-temperature hot air is avoided, and the energy utilization efficiency is improved. By using the high-temperature hot air as the combustion-supporting air of the main burner, the temperature of the high-temperature hot air is higher than that of the normal-temperature combustion-supporting air used in the prior art, the combustion can be provided with more favorable conditions, the fuel combustion is more sufficient, the fuel consumption of the main burner is reduced, and the energy cost in the production process is reduced.

The utility model belongs to the technical field of sorting procedure, especially relates to a sorting procedure green environmental protection water balance system, including the pit water storage area, the ore dressing operation main factory building, the roller grinding operation area, the high -placed water pool, the floating boat pump station, the concentration tank, the ring water pump house, the buffer pool, the floating boat pump station is located in the pit water storage area, the floating boat pump station connects the high -placed water pool, the high -placed water pool connects the ore dressing operation main factory building, the roller grinding operation area and the ring water pump house, the ring water pump house and the concentration tank are provided with near the ore dressing operation main factory building, the drainage of ore dressing operation main factory building passes through the tailing way and leads to the concentration tank, the concentration tank connects the ring water pump house, the ring water pump house connects the water inlet of ore dressing operation main factory building, the buffer pool is provided near the ring water pump house, the buffer pool connects the pit water storage area, the automatic liquid level device is equipped in the buffer pool, the roller grinding operation area connects the ore dressing operation main factory building. The utility model will effectively control production wastewater storage water level, effectively reduce enterprise new water unit consumption, effectively control production water and so on and discharge.

The application provides a method and system for negative pressure conveying and sorting of stone coal of a medium-speed coal mill, and belongs to the technical field of stone coal recycling in a pulverizing system of a thermal power plant, which can alleviate or solve the problems of large artificial transfer dust, difficult to balance coal particle recovery and stone removal in single sorting, and difficult to recycle combustible components in existing stone coal disposal. The method obtains operation parameters of a stone coal treatment process, and negative pressure conveys stone coal discharged from a medium-speed coal mill to a stone coal bin and dedusts the conveying airflow, adjusts the discharging state of the stone coal bin to make the stone coal spread, sequentially performs particle size screening, projectile sorting and stone identification and removal, and separates coal particles and stone particles, and returns the coal particles to a raw coal bin or an inlet of the medium-speed coal mill after regrinding. The method and system can improve the recovery rate of coal particles and the accuracy of stone removal, reduce dust escape, stone coal discharge and fuel waste, and realize continuous and automatic internal recycling of stone coal.

The utility model discloses a steam condensate box white smoke plume eliminating structure which comprises a condensate box and further comprises a discharge pipe, a spray head, a water pump, a PLC and a liquid level sensor, the discharge pipe comprises an inner pipe and an outer pipe, the inner pipe is coaxially arranged in the outer pipe, the outer walls of the two ends of the inner pipe are fixed to the inner wall of the outer pipe through annular sealing plates respectively, and the spray head is arranged on the inner wall of the outer pipe. A circulating cavity is formed between the inner pipe and the outer pipe, the upper portion and the lower portion of one side of the circulating cavity are communicated with a circulating water return pipe and a circulating water inlet pipe respectively, and the bottom end of the inner pipe is communicated with the top of the condensate box. A water inlet of the water pump is communicated with the interior of the condensate box through a pipeline, a water outlet of the water pump is connected with one end of the spraying pipe, the other end of the spraying pipe is communicated with the nozzle, the nozzle is arranged at the top end of the inner pipe, and a spout of the nozzle faces the interior of the inner pipe. The device has the advantages that indirect contact heat exchange of cooling circulating water to steam and direct contact heat exchange of spraying are utilized, steam emission is reduced, and white smoke plume is reduced.

The utility model provides a kind of boiling furnace burn purification ash device, it is related to the technical field of fluidized combustion equipment, including body, wind box air supply component, the base of body is provided with air cap, the sidewall of body is provided with coal dust inlet pipe, the air outlet of wind box is connected with base, to send air to body and blow open the coal dust entering, body is provided with purification ash dust injection pipe, and the distance of purification ash dust injection pipe from the base of body is 600-700 millimeters, during the upward movement of the purification ash that is not fully combusted, in turn through the middle of boiling layer, the upper portion of boiling layer, purification ash can be fully combusted.Sending air component includes the first air supply pipe being arranged on the sidewall of body, the second air supply pipe being arranged in the interior of body, the outlet of first air supply pipe is arranged on the inner wall of body through the sidewall of body, and blows to the internal space of body, the wind of the outlet of second air supply pipe blows to the inner wall of body, to reduce the adhesion of dust, prolong the service life of fluidized bed furnace.

The invention discloses a method for recycling converter steel slag, which comprises the following steps of: mixing high-alkalinity steel slag with multi-source solid waste to react according to different alkalinity of converter hot-state steel slag, so as to obtain phosphorus-free slag, high-chlorine slag and ferrophosphorus slag which are in a solid solution state and are mutually layered; and then the components can be respectively circulated to corresponding working procedures of steel production for absorption. The low-alkalinity steel slag is subjected to cooling, crushing and acid leaching, the obtained iron slag is returned to be sintered for absorption, and the leachate is subjected to micro-electrolysis, oxidation and precipitation treatment and then is respectively recovered to obtain iron phosphate and calcium chloride products, so that zero discharge of wastewater is realized. According to the method, the steel slag is subjected to quality-divided treatment according to different alkalinity of the converter hot steel slag, so that the harmless treatment effect of the steel slag is improved, the discharge amount of the steel slag is greatly reduced, the method is environment-friendly and low in treatment cost, and synergistic efficient treatment of different steel slag, steel mill solid waste and waste acid is realized through a simple and easy-to-operate process; waste gas emission is little, no waste water is discharged, the required raw materials are solid wastes generated in the iron and steel industry, the overall treatment cost is low, and the method is environment-friendly.

The utility model relates to the field of steam boxes and steam ovens, in particular to a condensing device applied to the steam boxes and the steam ovens, which comprises a condensing box, a condensing plate is arranged in the condensing box, the condensing box is divided into an upper cavity and a lower cavity by the condensing plate, a condensing air duct is arranged in the upper cavity, a condensing space is reserved between the condensing air duct and the upper cavity, and the condensing air duct is communicated with the lower cavity. The condensation space is communicated with the steam exhaust connector; the bottom of the lower cavity is an inclined bottom plate, and a drainage connector is arranged at the lowest position of the lower cavity. A plurality of through holes are further formed in the periphery of the condensation plate. After the scheme is adopted, condensate water can be recycled, and water vapor output to the external environment is reduced.

The present invention belongs to the technical field of coal seam water injection and dust suppression, and in particular, relates to a biological pore expansion and wetting agent, a preparation method thereof, and an application thereof. The biological pore expansion and wetting agent of the present invention comprises the following components: an acid-producing bacterial group, a nutrient substance, a biological surfactant, and ethanol wastewater. The present invention enriches acetic acid bacteria from the vinegar mash discarded from the vinegar brewing industry under non-sterile conditions, mixes it with a culture solution containing ethanol wastewater to prepare a biological pore expansion and wetting agent, and injects it into the coal seam water injection hole, so that the acetic acid bacteria group adheres to the surface of the coal seam to oxidize ethanol to produce acetic acid, a corrosive substance, to expand the pores of the coal seam. The present invention uses an acetic acid bacteria culture solution containing ethanol wastewater for treatment, which can effectively solve the problem that the coal seam is not easily wetted by water and difficult to penetrate, improves the water injection efficiency of the coal seam, expands the wetting radius of the coal seam, and effectively reduces the dust production of the coal seam working face.

The invention discloses a steel slag hot-state circulation treatment method, which is characterized in that based on the characteristics of steel slag and steel mill solid waste, a new thought of combining the steel slag with specific solid waste for coordinated treatment so as to realize steel slag dephosphorization and solid waste absorption is provided, and reaction products obtained by the synergistic treatment of the steel slag and the solid waste have different melting points and are easy to separate; accumulation and enrichment of harmful elements in the solid waste are greatly avoided; the low-cost enrichment of phosphorus in the steel slag is realized, the discharge capacity of the steel slag can be greatly reduced, and particularly, the obtained phosphorus-free slag has higher heat and can be circularly used for converter smelting, so that the energy is saved. Compared with an existing reduction gasification dephosphorization technology, the dephosphorization effect is better, the waste gas emission amount is small, no waste water is discharged, in addition, the technology is more concise, the stability is higher, and the input cost is lower.

The utility model relates to the technical field of traditional Chinese medicine production equipment, in particular to a dust removal device for traditional Chinese medicine cutting. The dust removal device comprises a first channel, the first channel is communicated with the traditional Chinese medicine cutting cavity, a draft fan and a buffer channel are arranged at the joint of the first channel and the traditional Chinese medicine cutting cavity, the buffer channel is transversely arranged, one end of the buffer channel is an inlet, the other end of the buffer channel is an outlet, the inlet is connected with the first channel, and the outlet is connected with the second channel. An outlet is formed in the middle of the buffer channel and faces outwards, a bulging unit bulging outwards and a second channel are arranged in the middle of the buffer channel, the second channel extends in the vertical direction, the middle of the second channel is communicated with the outlet of the buffer channel, one end of the second channel is connected with a dust collection box, and the other end of the second channel is a discharge outlet.

The application discloses a kind of lead-zinc ore beneficiation method and system in polymetallic ore, it is related to the technical field of beneficiation, including the following steps: S1, crushing;S2, grinding;S3, lead flotation: the ore pulp after grinding is sent to lead flotation tank, flotation reagent includes 25# black medicine, butyl xanthate, foaming agent and zinc inhibitor, using 1 rough 2 sweep 3 precise flotation, and output lead concentrate and lead tailings;S4, zinc flotation: lead tailings are sent to zinc flotation tank, and flotation reagent includes copper sulfate, butyl xanthate and foaming agent, using 1 rough 2 sweep 3 precise flotation, and output zinc concentrate and zinc tailings;S5, tailings, wastewater treatment: the fluorite tailings produced by flotation are subjected to solid-liquid separation, and the liquid phase is sent to a sewage treatment station for treatment, and the treated water is recycled to the beneficiation section;Solid phase is sent to mine for filling treatment or used as building material, solve the problem that there is no efficient, environmentally friendly, economic lead-zinc ore comprehensive recovery beneficiation process suitable for the ore properties in Sichuan Mabian area in the prior art.

The application discloses a seawater desalination sludge heat pump drying-mineralization recycling method, which comprises the following steps: homogenizing, screening and removing impurities and mechanically dewatering seawater desalination sludge to obtain dewatered sludge; grading countercurrent desalination of the dewatered sludge through a first washing section and a second washing section to obtain salt-regulated sludge; mixing and forming the salt-regulated sludge and back-mixed formed material to perform closed cycle heat pump drying, and dividing dried condensate water into high-salt condensate water and low-salt condensate water according to a preset conductivity threshold; crushing, grinding and grading the dried sludge, and then performing acidification and mineral release and buffer stable mineralization of the low-salt condensate water, seawater desalination produced water and carbon dioxide gas to obtain mineralized produced water and mineralized residual material, so that the seawater desalination sludge is dried, desalted and mineralized and recycled.

This invention discloses a system for extracting sodium chloride crystals from wastewater, comprising a raw material tank, a thin-film evaporator, a thickener, and a mother liquor tank. The raw material tank stores wastewater, and its outlet is connected to the inlet of the thin-film evaporator. The bottom outlet of the thin-film evaporator is connected to the inlet of the thickener. The upper overflow port of the thickener is connected to the inlet of the mother liquor tank, and the outlet of the mother liquor tank is connected to the thin-film evaporator. The bottom of the thickener has an outlet for material discharge. Wastewater enters the thickener from the raw material tank and the thin-film evaporator. The clear liquid from the thickener flows out from the upper overflow port and returns to the thin-film evaporator via the mother liquor tank. The system also includes a heat exchanger located between the raw material tank and the thin-film evaporator. The wastewater flowing from the raw material tank is heated by the heat exchanger before entering the thin-film evaporator. This invention provides a system for extracting sodium chloride crystals from wastewater, reducing system operating energy consumption and production costs.

The invention relates to an energy-saving process for synergistically recycling hydrogen peroxide and dilute sulphuric acid in acid-making tail gas desulfurization, which comprises the following steps: S1, tail gas desulfurization reaction: introducing tail gas discharged from a final absorption tower of an acid-making system into a tail gas desulfurization tower, and spraying a hydrogen peroxide solution from the upper part of the desulfurization tower to generate dilute sulphuric acid with the volume concentration of 20-25%; s2, graded collection of dilute sulphuric acid: when the volume concentration reaches 22%-25%, conveying the dilute sulphuric acid to a dilute acid storage tank by a dilute acid pump; when the volume concentration is lower than 22%, returning to the desulfurization tower for continuous recycling; s3, recycling and distributing dilute sulfuric acid: recycling the dilute sulfuric acid in a dilute acid storage tank in two paths: (1) conveying the dilute sulfuric acid with the volume ratio of 80-85% to an acid-making dry absorption process to prepare finished acid with the volume concentration of 93% or 98%; (2) conveying dilute sulphuric acid with the volume ratio of 15-20% to a purification process; s4, hydrogen peroxide is dynamically supplemented, and it is ensured that the residual concentration of hydrogen peroxide in dilute sulfuric acid is maintained to be 0.1%-0.5%. Accurate consumption control of hydrogen peroxide and resource recycling of dilute sulphuric acid can be realized.

The utility model discloses ultra-low-content ethylene glycol wastewater recovery equipment of an ethylene glycol device, which belongs to the technical field of chemical production equipment and is characterized in that the top of a carbon dioxide desorption tower is connected with a tower top air cooler of the carbon dioxide desorption tower through a pipeline, and a thermometer is arranged on the pipeline; the carbon dioxide desorption tower is connected with the carbon dioxide desorption tower reboiler through a pipeline, a flowmeter b and a flow regulating valve b are arranged on a heat source pipeline on the left side of the carbon dioxide desorption tower reboiler, and the carbon dioxide desorption tower vacuum ejector is connected with the carbon dioxide desorption tower through a pipeline; a flow meter a and a flow regulating valve a are arranged on a pipeline for connecting a vacuum ejector of the carbon dioxide desorption tower and the carbon dioxide desorption tower, and the carbon dioxide desorption tower is connected with a tower top air cooler of the carbon dioxide desorption tower through a pipeline. Meanwhile, the waste water treatment capacity is increased, the combustion cost of the device is increased, and energy waste is caused, and the device is mainly applied to the aspect of waste water recovery.

The invention discloses a fluorine-containing wastewater purification and fluorine resource recovery method, which is suitable for a treatment scene in which F / HF and metal fluorine complexes coexist in fluorine-containing wastewater. The method comprises the following steps: homogenizing and pre-filtering wastewater; adjusting the pH value of the system to 8.5-10.5 under an alkaline condition to break complex, promoting hydrolysis of iron, aluminum and other metal ions to generate metal hydroxide flocs, and then carrying out solid-liquid separation to obtain fluorine-containing supernate; acidifying the supernate until the pH value is 0.8-2.0, extracting and splitting the supernate and an organic phase containing an amine carrier to obtain a fluorine-rich organic phase and a fluorine-poor water phase, washing the fluorine-rich organic phase, and performing reverse extraction to obtain a fluorine-containing recovery solution and recycling the organic phase; the fluorine-poor water phase enters a renewable fluorine removal material for deep fluorine removal to obtain treated water, and fluorine-containing regenerated waste liquid generated by regeneration flows back to the acidification section. According to the method, the operation stability can be improved, wastewater purification and fluorine resource recovery are realized, and discharge of fluorine-containing regenerated liquid is reduced.

The invention provides a method for extracting neopentyl glycol from wastewater, in the method, the wastewater comes from wastewater generated at the top of a neopentyl glycol light component removal tower, the content of the neopentyl glycol in the wastewater is about 10-15%, the generated wastewater directly enters a stripping tower, the stripping tower is filled with Pall ring filler, the neopentyl glycol in the wastewater is purified by raising the feeding position, and the neopentyl glycol in the wastewater is purified. According to the method, a light component removal tower is adopted, a 65-75% neopentyl glycol aqueous solution is produced at the bottom of the tower, a clear solution containing methanol and isobutyraldehyde is discharged from the top of the tower, neopentyl glycol in wastewater is separated at the pressure of 10-20 kPa and the temperature of 90-100 DEG C, and the recovered neopentyl glycol aqueous solution directly enters the light component removal tower through a returned material. According to the method, neopentyl glycol in the wastewater can be effectively recovered, the production cost is reduced, and the production benefit is increased.

The utility model discloses a dynamic blowing and sucking type oil smoke exhaust device which comprises an air curtain air supply mechanism, a cambered surface type smoke exhaust hood and a cooking bench, a heating area is arranged at the top of the cooking bench; the cambered surface type exhaust hood is arranged behind the cooking bench; the air curtain air supply mechanism comprises an air blower, a flexible gradually-expanding air supply pipe and a strip-shaped air opening, the two ends of the flexible gradually-expanding air supply pipe are connected with the air blower and the strip-shaped air opening respectively, and the strip-shaped air opening is located in front of the cooking bench and faces the cambered surface type exhaust hood. A wrapping area is formed in a lampblack generation area, lampblack diffusion is prevented, and the lampblack trapping rate is improved.