7579results about "Fractional distillation" patented technology

The invention discloses a dynamic intelligent control method and system for improving the efficiency of a rectifying tower, particularly relates to the technical field of chemical process control, and is used for solving the technical defect that an operation variable is mismatched with a physical state due to the fact that an existing distributed control system cannot recognize a hidden degradation state of equipment. The method comprises the following steps: acquiring temperature gradient distribution of each tower plate of a rectifying tower, thermal load of a reboiler and tower top condensation load parameters in real time, calculating a mass transfer efficiency offset by combining the temperature gradient distribution to generate a scaling trend index, and synchronously calculating a local entropy yield based on the thermal load and the condensation load to generate a thermodynamic irreversibility index. When the double indexes exceed a preset threshold value, it is judged that a recessive degradation state is entered, then a backflow ratio correction coefficient is reversely derived through a dynamic correlation model, and the correction coefficient is input into a distributed control system to dynamically adjust backflow ratio operation parameters; the product purity is maintained, the tower plate scaling process is obviously delayed, and long-term efficient operation of the rectifying tower is guaranteed.

The invention discloses argon recovery equipment capable of achieving stable rectification and a working method thereof.The argon recovery equipment capable of achieving stable rectification comprises a rectification system, the rectification system comprises a temperature adjusting mechanism and an argon extraction unit, and the argon extraction unit comprises a pure argon tower, an argon tower reboiler, a pure argon pipe set, a first valve set and a stability increasing component; the stability augmentation component comprises a stability augmentation assembly and a temperature detection piece, and the stability augmentation assembly comprises a nitrogen compressor and a nitrogen reboiler. According to the amount of pure argon gasified through heat exchange between pure liquid argon obtained through rectification in the pure argon tower and dried crude argon obtained after cooling in the argon tower reboiler, the supply amount of dry nitrogen is adaptively adjusted through the stability augmentation component so as to adjust the amount of pure argon supplied to the pure argon tower by the nitrogen reboiler; the argon extraction unit and the argon tower reboiler are jointly matched with the actual working condition of the argon tower reboiler, so that the anti-interference capability of the argon extraction unit is improved, the stability of the rectification process is ensured, and the purity of the obtained pure argon is ensured.

The invention discloses a p-methyl benzyl chloride production process and a production system thereof, p-xylene side chains and chlorine are subjected to a gas phase substitution reaction under micro negative pressure and visible light catalysis to generate crude methyl benzyl chloride and hydrogen chloride, and 99.0% methyl benzyl chloride, a small amount of benzyl dichloride and 31% hydrochloric acid are respectively generated through rectification and absorption; the device consists of four working sections of chlorination, rectification, hydrochloric acid absorption and distillation. According to the method, the defects in the prior art are overcome, on one hand, chlorine is introduced, and an aromatic ring chlorination reaction is carried out under visible light catalysis; on one hand, a supported catalyst filler is arranged at the bottom of a chlorination tower, and a zeolite molecular sieve modified by long-chain alkylsilane and supported by metal salt is used as a catalyst to catalyze chloromethylation reaction, on the other hand, the hydrophobicity of the modified catalyst is obviously enhanced, and meanwhile, the density of acidic sites is not reduced; the contact opportunity of the catalyst and a reaction substrate is greatly increased, and the catalytic efficiency of the catalyst is improved.

The invention relates to a batch rectification system based on intelligent control, and relates to the technical field of batch rectification. A data acquisition module; the data acquisition module is used for acquiring temperature, pressure, flow and material concentration data in real time; the control module is used for receiving various data of the data acquisition module; a model prediction control algorithm is built in the control module; according to the model prediction control algorithm, a rectification process dynamic model is established, a current system state and a set control target are combined, an optimal control strategy is obtained through rolling optimization calculation, and a control instruction is sent by an execution mechanism based on the optimal control strategy; an execution mechanism; the touch display screen is connected with the control module; the operation parameters of the rectification system are displayed in real time.

The invention discloses a rectifying tower for producing furanone, and relates to the technical field of rectifying tower condensers. According to the rectifying tower for producing furanone, when steam is condensed, the flowing speed of cooling water can be reduced, the path of the cooling water can be increased, meanwhile, the cooling water between the partition plate assemblies can be stirred in a reciprocating mode, the heat absorption efficiency of the cooling water is higher, the heat absorption effect of the cooling water is better, and then the condensation efficiency and effect are improved; when the flow speed of the steam is too high, the speed of the steam can be limited, and when the flow speed of the steam is relatively low, air extraction operation can be carried out to accelerate the steam in the tower body to thoroughly enter the condenser assembly for condensation operation, so that the condensation efficiency and effect can be improved; a condenser pipe can be knocked and vibrated in a reciprocating manner, so that condensed furanone liquid is prevented from being attached to the inner wall, and the collection effect is better; and before the cooling water enters the heat exchanger, the cooling water can be pre-cooled, so that the subsequent cooling efficiency and effect of the heat exchanger are improved.

The invention discloses a process and a device for preparing insoluble sulfur by comprehensively utilizing methyl / ethyl byproduct sulfur. The device comprises a distillation kettle, the distillation kettle is communicated with a quenching box through a pipeline, a turbulent flow assembly is fixed in the quenching box, a water channel fixedly connected with the quenching box is arranged at the lower end of the turbulent flow assembly, and a cooling spraying assembly is arranged at the lower end of the water channel. A transmission rod in transmission connection with the turbulent flow assembly and the cooling spraying assembly is arranged at the lower end of the water channel, the lower end of the transmission rod is in transmission connection with a grinding assembly, the cooling spraying assembly comprises a cooling part and a spraying part, the cooling part comprises a cooling disc, the interior of the cooling disc is hollow, and multiple circles of concentrically-arranged cooling pieces are arranged at the upper end of the cooling disc; the cooling plates are provided with air channels, the upper end of the cooling disc is rotationally connected with a rotating ring, cooled carbon disulfide is introduced into the cavity of the cooling disc, the cooling plates are arranged on the cooling disc, the contact area with byproduct sulfur steam is increased, and the byproduct sulfur steam can be rapidly cooled conveniently.

The present invention relates to the technical field of solvent purification, and discloses a propylene glycol methyl ether acetate purification control method and a propylene glycol methyl ether acetate purification process, the propylene glycol methyl ether acetate purification control system comprises a rectification device and a rectification control system, the rectification device comprises a rectification tower, a raw material preheater, a condenser, a reflux tank and a reboiler, the rectification control system comprises an environment temperature measuring unit, a tower top temperature measuring unit, a tower bottom temperature measuring unit, a feeding temperature measuring unit and a regulation and control module, the rectification control system is pre-trained with a parameter prediction model, and the parameter prediction model takes the environment temperature, the tower top temperature, the tower bottom temperature and the feeding temperature as input to output regulation and control parameters. The regulation and control parameters comprise the opening degree of a steam valve, the power of a condenser and the opening degree of a return valve, a primary distribution controlled parameter is obtained according to a preset distribution strategy, the primary distribution controlled parameter is specifically the optimized regulation and control parameter, and the tower top temperature is controlled within a preset tower top temperature range according to the primary distribution controlled parameter.

A method for producing a tin compound represented by formula (A1) with a purity of 95 mol % or higher, involves a step of distilling the tin compound, in which the number of plates of the distillation is 10 or more, and the reflux ratio is 30 or less.RSnX3  (A1)In formula (A1), R is an organic group with 1 to 30 carbon atoms, and may be substituted with halogen, oxygen atoms, or nitrogen atoms. X is selected from OR′ and NR′2. R′ is an organic group with 1 to 10 carbon atoms, and part may be substituted with halogen, oxygen atoms, or nitrogen atoms. When there are multiple R′ groups in the molecule, they may have the same or different structures, and they may be bonded to each other to form a cyclic structure.

The invention discloses a multi-effect rectification system control method and a control system thereof.The method comprises the steps that technological parameter data in a multi-effect rectification system are collected in real time, and the technological parameter data comprise the steam flow, the feeding flow, the reflux flow and the recovery quantity of each stage of rectification tower; the temperature and the pressure of each tower plate in each stage of rectifying tower are measured; for each stage of rectifying tower, acquiring static operation parameters of the rectifying tower in a set load section based on a full-automatic load regulation algorithm; the static operation parameters comprise the steam flow, the reflux quantity and the extraction quantity of each stage of rectifying tower; for each stage of rectifying tower, on the basis of the static operation parameters, dynamic operation parameters in the load change process are obtained through a load transition algorithm, and the multi-effect rectifying system is controlled according to the dynamic operation parameters. The method can automatically adapt to feeding change and production load adjustment, optimizes energy efficiency and product quality in the rectification process, automatically adjusts system parameters when the production load fluctuates, and realizes optimal control of energy efficiency and product quality.

The invention discloses preparation equipment and a preparation process for preparing high-purity electronic-grade thionyl fluoride, and the preparation equipment comprises a mixer, the mixer is communicated with a first preheating device, the first preheating device is communicated with a first rectifying tower, the top of the rectifying tower is connected with a condenser, the condenser is communicated with a crude product tank, the crude product tank is communicated with a second preheating device, and the second preheating device is communicated with a second rectifying tower. The second preheating device is communicated with a second rectifying tower, the second rectifying tower is communicated with a third rectifying tower, the third rectifying tower is connected to a storage tank, the storage tank is connected with a vaporization device, the vaporization device is pressurized and then stored in a high-pressure buffer tank, the high-pressure buffer tank is connected with at least three adsorption towers, and the adsorption tower at the rearmost end is connected with a high-pressure product tank. According to the invention, the purity of the finished product is improved, and all raw material components are fully utilized.

The utility model relates to the technical field of heat pump rectification, and particularly discloses a heat pump rectification system which comprises a rectification tower; the tower top gas liquefaction system comprises a compressor connected with a gas phase at the top of the rectifying tower, and a reboiler, a throttling device, a condenser and a flow divider which are sequentially connected with the compressor; liquid phase connection at the bottom of the rectifying tower is communicated with the reboiler, the tower bottom reboiling system comprises an auxiliary reboiler and a flash evaporator which are sequentially communicated with the reboiler, and the flash evaporator is communicated to the rectifying tower; and the gas phase at the top of the rectifying tower is heated by the compressor and then enters the reboiler to exchange heat with the liquid phase at the bottom of the rectifying tower, so that the rectifying energy consumption can be reduced, and the energy-saving effect is achieved.

The invention provides a preparation device and process of electronic-grade silane. According to the preparation device, a first disproportionation reaction is carried out on the basis of the first reactor, dichlorosilane is rectified and separated to serve as a raw material for a second disproportionation reaction, silane can be obtained on the basis of cheap trichlorosilane and a catalytic reagent, and electronic-grade silane can be obtained on the basis of traditional purification after rectification; based on heat exchange between tower top materials of the rectifying tower I and a tower kettle reboiler of the rectifying tower II, differential pressure thermal coupling integration is realized, condensing equipment and operation steps can be omitted, energy consumption is reduced, and the defects of high preparation cost and high energy consumption of a silane preparation device in the prior art are overcome.

The invention belongs to the field of environment-friendly gas purification and energy conservation, and discloses a desulfurization and decarbonization method and system. The desulfurization and decarbonization system comprises a flue gas absorption system and an amine liquid regeneration system, the flue gas regeneration system comprises an absorption tower, a high-temperature rich and lean liquid heat exchanger, a low-temperature rich and lean liquid heat exchanger and a heat pump system; the amine liquid regeneration system comprises a regeneration tower, a thermal coupling reboiler, a high-pressure reflux tank, a reboiler, a low-pressure flash tank, a barren liquor low-temperature cooler and a steam flash tank. The desulfurization and decarbonization method comprises the following steps: in an absorption tower, performing countercurrent contact on amine liquid and raw material gas, and absorbing acid gas in the raw material gas to generate an amino salt compound, so as to obtain amine-rich liquid; the amine-rich liquid enters a regeneration low-pressure tower and a regeneration high-pressure tower, the amino salt compound is regenerated to release acid gas to generate amine liquid, and the amine liquid returns to the absorption tower. By utilizing a high-low pressure regenerative thermal coupling technology and a heat pump technology, the energy consumption of the system is effectively reduced, the overall absorption efficiency is improved, and the equipment investment and site arrangement are saved.

The invention discloses an electronic-grade nitric acid preparation device and method capable of controlling the filtering speed based on temperature difference, and relates to the technical field of nitric acid preparation.The electronic-grade nitric acid preparation device comprises a first-stage rectifying tower and a second-stage rectifying tower, and a first-stage evaporator and a second-stage evaporator are arranged on the outer sides of the bottoms of the first-stage rectifying tower and the second-stage rectifying tower respectively; compared with an existing filtering part, the temperature control assembly is arranged, the temperature control assembly has double functions, on one hand, liquefied nitric acid entering the filter is preheated, and on the other hand, the filtering speed of the filtering assembly on nitric acid is changed according to needs; in addition, a filling disc is accurately rotated through a reversing motor, so that a target material storage cavity is isolated from the rectifying tower main body, and the risk of negative pressure damage or harmful gas leakage in the tower in the traditional dismounting process is avoided.

The invention discloses a purification device for producing electronic-grade hydrofluoric acid, which relates to the technical field of hydrofluoric acid production, and comprises a rectifying tower body, tower plates movably connected in the rectifying tower body at equal intervals, overflow weirs fixedly connected on the tower plates, a rotating speed convenient regulation and control mechanism and a state monitoring feedback mechanism, the follow-up rod and the tower plates installed on the outer surface of the follow-up rod can be driven to synchronously rotate in the rectifying tower body, so that the gas-liquid contact area is increased, the gas-liquid contact time is prolonged, the mass transfer process between gas and liquid phases is promoted, in the rectifying process, the separation efficiency and purity can be improved, impurities in raw materials can be removed more easily, and the product quality is improved. And the rotation of the tower plate can enhance the mixing of the liquid on the tower plate, so that the liquid is more uniformly distributed on the tower plate, the residence time and dead zone of the liquid on the tower plate are favorably reduced, and the separation efficiency is further improved.

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.

The invention belongs to the technical field of chemical production, and particularly relates to an efficient energy-saving refining system for producing cyclohexanone through dehydrogenation, which comprises an alcohol tower, a dehydrogenation heat exchanger, a dehydrogenation reactor, an alcohol tower feeding heat exchanger, a dehydrating tower, a light tower I, a light tower II, a ketone tower and an alcohol recovery tower which are connected in sequence, a middle feeding port of the alcohol tower is communicated with a tube pass discharging port of the alcohol tower feeding heat exchanger, a top discharging port of the alcohol tower is communicated with a tube pass feeding port of the dehydrogenation heat exchanger, a bottom discharging port of the alcohol tower is communicated with a middle feeding port of the alcohol recovery tower, and an alcohol ketone drying tower is additionally arranged between the alcohol tower feeding heat exchanger and the dehydration tower. A feed port of the alcohol ketone drying tower is communicated with a shell pass discharge port of the alcohol tower feed heat exchanger, and a liquid phase discharge port of the alcohol ketone drying tower is communicated with an upper feed port of the dehydrating tower. The alcohol tower adopts a process that raw materials directly enter the tower top, tower top reflux is cancelled, steam consumption is reduced, and the purpose of saving energy is achieved.

The invention relates to the technical field of rectification, in particular to a balanced full-automatic separation control method for a rectifying tower system, the rectifying tower system comprises a rectifying tower I. The control method comprises the following steps: carrying out material balance control and gas-liquid balance control on the rectifying tower I. The gas-liquid balance control is used for controlling the reflux quantity of a material refluxed into the rectifying tower I; the material balance control comprises the following steps: detecting the actual feeding flow of the rectification tower I and the actual liquid level value of a first reflux tank corresponding to the rectification tower I, and calculating and controlling the flow of the material extracted from the tower top of the rectification tower I in real time by combining the set value of the component extracted from the tower top of the rectification tower I and the density of the component extracted from the tower top. Through the preparation method, the stability and the efficiency of a rectifying tower system are improved, and the energy consumption cost and the product volatility problem are reduced.

The invention relates to the technical field of chemical engineering, in particular to a method and a device for removing heavy components from cyclohexanol. Comprising the following steps: a, rectifying a cyclohexanol-containing material from a cyclohexene hydration reaction to obtain a first solution containing cyclohexanol and heavy components in a tower kettle; b, carrying out heavy component removal operation on the first solution to obtain a third solution containing a catalyst and heavy components, a first gas phase and a second gas phase; and c, rectifying the first gas phase and the second gas phase to obtain a fourth solution subjected to heavy component removal, namely cyclohexanol subjected to heavy component removal. The entrained catalyst and heavy components are removed together, and the fluidity required by the catalyst waste liquid is maintained by using the heavy components, so that the loss of cyclohexanol is reduced.

The utility model provides a crude methanol cascade heat pump energy-saving device which comprises a pre-rectifying tower and a normal pressure rectifying tower which are connected in sequence, the bottom of the pre-rectifying tower is connected with a pre-tower reboiler, the normal pressure rectifying tower is connected with N normal pressure tower reboilers, the top of the pre-rectifying tower is connected with a pre-tower heat pump, the pre-tower heat pump is connected with the pre-tower reboiler, and the N normal pressure tower reboilers are connected with N normal pressure tower reboilers. The pre-tower reboiler is connected with a pre-tower reflux device, the top of the normal-pressure rectifying tower is connected with M normal-pressure tower heat pumps, M is equal to N, and M and N are greater than or equal to 2; the atmospheric tower heat pumps are respectively connected with atmospheric tower reboilers, and the N atmospheric tower reboilers are all connected with a refined methanol extraction device; according to the invention, the traditional methanol rectification process is changed, the tower is supplied with heat in a stepped manner through a steam direct compression type heat pump energy-saving technology at the top of the normal-pressure rectification tower, efficient stepped recovery of waste heat energy at the top of the normal-pressure rectification tower is facilitated, production operation is facilitated, and energy consumption is reduced.

The invention discloses a rectification mechanism and a carbon disulfide production system containing the same. The rectification mechanism comprises an integrated rectification tower, and an inner cavity of a shell of the integrated rectification tower is sequentially divided into a function-integrated pre-separation and sulfur removal area, a main rectification and hydrogen sulfide removal area and a condensation reflux area from bottom to top in the vertical direction; the pre-separation and sulfur removal area comprises a settling tank arranged at the lower part of the shell, a gathering cover arranged above the inner wall of the settling tank, and a gas rising pipe I arranged above the gathering cover; the invention belongs to the technical field of chemical separation, and achieves the technical effects that multi-stage functions of pre-separation, main rectification, precise purification, final condensation and the like are innovatively integrated in a single tower, so that the fundamental simplification and compactness of the equipment structure are realized; in the traditional process, separate coarse removal, fine removal and finished product towers are replaced by unique expanded settling tanks in the towers, filler layers of integrated plate heat exchangers, tower tops with spiral condensation channels and side-draw systems.

The invention relates to the technical field of chemical separation, in particular to a cyclohexanone rectification and purification method based on high-tower segmented packing, which comprises the following steps: step 1, filtering a cyclohexanone raw material containing impurities to remove solid particles, and dynamically adjusting the filtering precision according to the viscosity of the raw material; 2, arranging a bottom section, a middle section and a top section in the vertical high tower; the temperature gradient of each section is regulated and controlled through an independent temperature control unit, so that the temperature gradient of the middle section is matched with the relative volatility of the cyclohexanone-light component; 3, dynamically adjusting the reflux ratio based on the real-time detection result of the purity of the tower top distillate, and controlling an intermittent discharge valve according to the density change of the tower bottom heavy component enrichment liquid so as to continuously remove the heavy components; and 4, recycling the waste heat of the steam at the top of the tower for preheating the raw materials, and inhibiting the tower pressure fluctuation through a buffer tank. Through the innovative design of sectional packing of the high tower, the separation efficiency is improved, the energy consumption is reduced, and meanwhile, the equipment reliability is improved.

The invention discloses a separation and extraction system for torreya grandis aril essential oil and an essential oil production line, and the system comprises a squeezing mechanism which comprises a mesh bag for containing torreya grandis aril and a squeezing disc; the distillation mechanism comprises a distillation retort and a steam guide assembly, the distillation retort is connected with a feeding pipe and a steam conveying pipe, the feeding pipe is communicated with the liquid outlet channel, and the steam guide assembly is used for guiding steam introduced into the distillation retort; the condensation mechanism is connected with the distillation retort through a condensation guide pipe, and distilled volatile oil is guided into the condensation mechanism together with steam to be condensed; the oil-water separation mechanism is connected with the condensation mechanism through a separation guide pipe, and the oil-water mixture output by the condensation mechanism is guided into the oil-water separation mechanism for oil-water separation and extraction. The essential oil separation and extraction system and the essential oil production line are suitable for torreya grandis planting fields with limited yield to extract essential oil, and the situation that torreya grandis aril is discarded as waste, and resources are wasted is avoided.

The invention discloses a preparation method of phosphorus oxyfluoride based on reaction separation equipment, which comprises the following specific steps: S1, a heat exchange medium enters a driving pipe fitting through a heat exchange medium inlet pipe of the reaction separation equipment, is pressurized at a discharge end of the driving pipe fitting and then is sprayed out in a horizontally outward inclined manner, a heat exchange mechanism and a second filler layer of the reaction separation equipment are driven to integrally rotate, so that a circulating heat source circularly passes through the whole reaction area; s2, respectively feeding liquid industrial phosphoric acid and gaseous anhydrous hydrogen fluoride when the reaction temperature of the reaction zone reaches a set value; s3, liquid industrial phosphoric acid and gaseous anhydrous hydrogen fluoride are in contact on the surface of the rotating second filler layer and react to generate phosphorus oxyfluoride gas; and S4, extracting phosphorus oxyfluoride gas generated by the reaction along the top of the reaction separation tower body. The controllability of the reaction process can be effectively ensured, and the reaction effect is obviously improved.

The invention relates to the technical field of glycerol triacetate preparation, in particular to an esterification phase splitter for preparing glycerol triacetate, which comprises a tower tray arranged in a rectifying tower, umbrella-shaped covers are uniformly distributed on the upper surface of the tower tray, and the tower tray comprises a movable tray, a fixed tray, a riser and an adjusting mechanism. By optimizing the structure of the umbrella-shaped cover and the design of the adjusting mechanism, the problems of a viscous layer and entrainment caused by high viscosity of glycerol triacetate are solved, by reducing the diameter of the bottom of the umbrella-shaped cover and reducing the comprehensive height of the overflow weir, the liquid flowing space is enlarged, the liquid retention time is shortened, and by forming an air inlet groove and an adjusting hydraulic oil cylinder, the liquid retention time is shortened. The gas-phase flow area is increased, gas-liquid contact is optimized, entrainment is reduced, through adjustment of the hydraulic oil cylinder, adaptation to the requirements of different reaction stages is achieved, the height of the downcomer is increased, and the flooding risk is reduced.

This application relates to the field of rectification equipment, and particularly to a rectification column with an anti-blocking structure, including: a tray, on which sieve holes are formed; a floating ball, arranged above the sieve holes, the diameter of the floating ball being larger than the diameter of the sieve holes, and a plurality of concave grooves being formed on the peripheral wall of the floating ball; a plurality of elastic arc plates, symmetrically fixed above the sieve holes, the upper ends of the plurality of elastic arc plates forming an open end with a diameter smaller than the diameter of the floating ball, a spacing being formed between adjacent elastic arc plates, and a gap being formed between the inner wall of the elastic arc plate and the peripheral wall of the floating ball. This application has the effect of reducing the probability of tray blockage.

The utility model provides a compound device for providing feed gas for preparing green ammonia from new energy and a green ammonia synthesis system. The composite device comprises a deep cooling air separation nitrogen generation subsystem, a hydrogen supply subsystem and a main heat exchanger, and the hydrogen supply subsystem comprises a water electrolysis hydrogen generation unit, a first hydrogen compressor, a second hydrogen compressor, a hydrogen storage tank and a hydrogen conveying pipeline. The hydrogen conveying pipeline comprises a first hydrogen conveying pipeline, a second hydrogen conveying pipeline and a third hydrogen conveying pipeline; the main heat exchanger is a multi-channel heat exchanger and comprises a first flowing channel used for flowing of a first medium and a second flowing channel used for flowing of a second medium, the second hydrogen compressor is connected with the hydrogen storage tank through the first flowing channel, and the hydrogen storage tank is connected with the third hydrogen conveying pipeline through the second flowing channel. The composite device provided by the utility model can ensure the supply stability of the raw material hydrogen of the ammonia production subsystem, and solves the technical problem that the hydrogen supply is unstable in the existing green ammonia synthesis process.

The invention discloses a low-temperature rectifying tower, and relates to the technical field of chemical equipment, the low-temperature rectifying tower comprises a tower body, a condensation circulating system arranged at the top of the tower body and a heat circulating system arranged at the bottom of the tower body, and further comprises a supporting column, a rectifying tower body, a rectifying tower cover and a rectifying tower cover, and the supporting column is supported at the central position in the tower body through a supporting frame; the tower plates are of hopper-shaped structures, the tower plates are arranged on the supporting column at intervals in the height direction of the supporting column, an opening of each tower plate faces the bottom of the tower body, a plurality of steam holes are formed in each tower plate, and a gap exists between the edge of each tower plate and the inner wall of the tower body; the baffle covers are in a hopper shape, the baffle covers are arranged between every two adjacent tower plates, through holes are formed in the centers of the baffle covers, gaps exist between the through holes and the supporting columns, the outer edges of the baffle covers are fixedly connected with the inner wall of the tower body, and the opening directions of the baffle covers face the top of the tower body. The heat and mass transfer efficiency of a gas phase and a liquid phase on the surface of the tower plate can be improved.

The invention relates to the field of chemical engineering, in particular to an n-hexane separation technology, and more particularly relates to a method and a device for preparing electronic-grade n-hexane. The method for preparing the electron n-hexane comprises the following steps: S1, introducing an adsorbent into an n-hexane raw material to remove moisture in the n-hexane, and then carrying out catalytic hydrogenation reaction to obtain crude n-hexane; and S2, carrying out primary filtration on the material subjected to catalytic hydrogenation, then carrying out light component removal and heavy component removal two-stage rectification to obtain high-purity n-hexane, and carrying out secondary filtration on the high-purity n-hexane to obtain the electronic-grade n-hexane. The device for preparing the electronic-grade n-hexane comprises a raw material tank, an adsorption tower, a catalytic hydrogenation reactor, an intermediate tank, a light component removal tower, a heavy component removal tower and a product tank which are connected in sequence. According to the preparation method and device, high-purity electronic-grade n-hexane meeting the strict requirements of the semiconductor industry can be produced, the process steps are simple, industrial production is easy to achieve, the product quality is stable and reliable, and high economic and social benefits are achieved.

The invention relates to a purification method of high-purity boron trifluoride 11, which comprises the following steps: S1, carrying out nitrogen purging and replacement on a purification device of boron trifluoride 11, and keeping the moisture content to be less than 1ppm; s2, the boron trifluoride 11 raw material is subjected to adsorption impurity removal, part of HF impurities are removed, and mixed gas is obtained; s3, rectifying the mixed gas obtained in the step S2 to remove light components, so as to obtain a mixed solution; s4, rectifying the mixed solution obtained in S3 again to remove heavy components, so as to obtain high-purity boron trifluoride 11; and S5, collecting the high-purity boron trifluoride 11 into a cold trap, and filling the cold trap with the high-purity boron trifluoride 11. According to the technical scheme provided by the invention, the purchased product is introduced into the rectifying tower to remove light components and heavy components so as to obtain a high-purity product, and light components and heavy component impurities such as H2, O2, Ar, N2, CO2, SO2, HF and SiF4 in boron trifluoride 11 are effectively removed through accurate control of the rectifying process, so that a high-purity 5N-grade boron trifluoride 11 product can be obtained, and the requirement of high-end application is met.