1310results about "Flash distillation" patented technology

The invention discloses a device and a method for producing oxamide, and relates to the field of chemical production. The method for producing oxamide specifically comprises the following steps: mixing a methanol solution of liquid ammonia and a methanol solution of dimethyl oxalate, carrying out ammonolysis reaction, carrying out flash evaporation, filtration and drying on first slurry obtained after the reaction is finished to obtain solid oxamide, and refining a liquid phase obtained by solid-liquid separation of the first slurry to obtain a byproduct methanol, ammonia in the tail gas is washed and absorbed by dimethyl oxalate and then returns to a reaction system. In the oxamide production process, dimethyl oxalate reacts with ammonia gas in mixed gas generated in the reaction process, and the obtained product is continuously subjected to subsequent ammonolysis reaction, so that the utilization rate of reaction materials is increased; meanwhile, a condenser is not used for condensing ammonia gas and methanol and then separating alcohol and ammonia, so that condensing equipment and cooling water are saved, the production cost is reduced, and industrial production is facilitated.

The invention discloses a process and a device for producing oxamide, and relates to the field of chemical production. The invention provides a process for producing oxamide, which specifically comprises the following steps: mixing a methanol solution of liquid ammonia and a methanol solution of dimethyl oxalate, carrying out ammonolysis reaction, carrying out flash evaporation, filtration and drying on first slurry after the reaction is finished to obtain solid oxamide, and carrying out liquid phase refining to obtain a byproduct methanol, ammonia in the tail gas is washed and absorbed by dimethyl oxalate and then returns to a reaction system. The methanol solution of dimethyl oxalate is used for absorbing excessive ammonia in the reaction process, and the reaction product is continuously used for producing oxamide, so that methanol and ammonia can be thoroughly separated, the conversion rate of ammonia can be greatly improved, and the economical efficiency of the production process is improved; meanwhile, tail gas containing ammonia is not discharged, and the environmental protection property of the production process is improved.

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 utility model discloses a waste heat steam boiler based on integration of a sulfur combustion furnace and nitrogen heat extraction, and belongs to the technical field of salt chemical engineering and waste heat recovery. In order to solve the problem of waste of waste heat of high-temperature SO2 flue gas in the SO2 preparation process of the sulfur combustion furnace, a layer of enclosure shell is additionally arranged outside a heat-preservation-free shell of the sulfur combustion furnace, an annular area between the enclosure shell and the heat-preservation-free shell serves as a heat exchange area, nitrogen or air serves as a heat exchange medium, dividing wall type heat exchange is carried out through the shell of the combustion furnace, the temperature of the nitrogen is increased, and the heat exchange efficiency is improved. The flue gas in the furnace is discharged after the temperature is gradually reduced; after being heated, the nitrogen is fed into the miniature high-temperature waste heat hot water boiler and exchanges heat with high-temperature waste heat water through the heat exchanger, and the cooled nitrogen is returned and circularly exchanges heat. The heated high-temperature waste heat supplied water is sent to downstream heat consumers and is continuously and circularly heated; the pressure of the flash steam is 0.1-0.6 MPa, and the flash steam is supplied as process steam, so that the flue gas waste heat can be greatly recovered when the normal operation of sulfur combustion is maintained.

The utility model relates to a sludge drying system coupled with a heat storage system. The sludge drying system comprises a heat storage module, a sludge drying module, a waste heat collecting module and a waste heat upgrading module, the heat storage module is used for storing peak regulation steam energy of the power plant; the sludge drying module is connected with the heat storage module, comprises a plurality of drying machines which are connected in parallel, and is used for drying sludge by utilizing low-pressure steam; the waste heat collecting module is connected with the sludge drying module and is used for recycling high-temperature waste gas waste heat; the waste heat quality improving module is connected with the waste heat collecting module and used for improving the quality of the waste heat and recycling the waste heat. The utility model has the beneficial effects that the drying technology is coupled with a boiler system, so that steam energy which is difficult to store is converted into storable and combustible fuel, the deep peak regulation of a power plant is facilitated, the scale of a heat storage system is reduced, and the economical efficiency of the system is improved.

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

The invention relates to the technical field of rectification, in particular to a rectifying tower for cracking C9 fractions, which comprises a tower body and a tower plate, the tower plate is arranged in the tower body, a CPD extraction device is arranged at the top end of the tower body, a DCPD side line extraction device is arranged in the middle of the tower body, and the lower part of the tower body is communicated with a solvent side line extraction device; a partition plate is arranged in the bottom end of the tower body, the space at the bottom of the tower body is divided into a flash evaporation space and a concentration space by the partition plate, the flash evaporation space is communicated with a C9 fraction supply pipeline through a cracking reactor, and the flash evaporation space is communicated with a tower kettle liquid return pipeline; a solvent extracted by the solvent side-draw device is mixed with tower bottoms extracted from the tower bottoms reflux pipeline, and then is heated by the reboiler and refluxed to the concentration space, and the concentration space is provided with a tower bottoms discharge pipeline; the influence of coking of materials in the rectifying tower or polymers on the rectifying operation can be reduced, and the stability of the rectifying operation is ensured.

The utility model discloses a heat source optimizing device for a reboiler of a methanol pre-rectifying tower, which comprises the pre-rectifying tower and the reboiler, and is characterized in that a branch pipeline is separated from the crude methanol discharge of a tower kettle and is connected with a negative pressure flash tank, and the crude methanol in the negative pressure flash tank is subjected to gas-liquid separation through flash evaporation; the bottom of the negative-pressure flash tank is connected with a methanol circulating pump, and a liquid-phase material is conveyed to a first heat exchanger at the top of the tower and returns to the negative-pressure flash tank after exchanging heat with steam at the top of the tower; a gas-phase material in the negative-pressure flash tank enters a compressor, is compressed and heated and then returns to the tower kettle of the pre-rectifying tower; according to the utility model, the process is improved by combining flash evaporation of a tower kettle discharge part with heat pump rectification, and meanwhile, the flash evaporation liquid is recycled to recycle steam heat at the top of the tower, so that the steam consumption of a reboiler of the methanol pre-rectifying tower and the use amount of circulating water at the top of the tower are effectively reduced, meanwhile, the reboiler does not need to be added, and the compression ratio of a heat pump compressor can be reduced.

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

The invention discloses a desulfurization gypsum dechlorination and upgrading process system, and belongs to the technical field of alpha semi-hydrated gypsum production. In a material cascade drying system of the process, a material outlet of a reaction device is communicated with a material inlet of a high-pressure slurry separation and dehydration device; a material outlet of the high-pressure slurry separation and dehydration device is communicated with a material inlet of the flash evaporation device, a material outlet of the flash evaporation device is communicated with a material inlet of the high-temperature drying device, and a separated steam outlet of the flash evaporation device is communicated with a steam inlet of the solid-liquid mixing device; a separated water outlet of the high-pressure slurry separation and dehydration device is communicated with a high-pressure inlet of the multi-stage water circulation system, a separated water outlet of the flash evaporation device is communicated with a steam inlet of the raw material reaction system, and a separated water outlet of the high-temperature drying device is communicated with a low-pressure inlet of the multi-stage water circulation system. According to the process, the energy consumption of the system is reduced through a cascade drying method, drying water with different pressures is effectively utilized through a multi-stage water circulation system, and the heat loss of the system is reduced through heat recovery.

The invention belongs to the field of industrial flue gas purification technology and energy conservation, and relates to a system and a method for removing condensable particulate matters through multi-field coupling synergistic enhanced condensation, the system comprises a desulfurization tower, a flash tank, a condensation structure, a liquid collecting tank and a cold water spraying layer, a slurry distribution layer of the flash tank is connected with a tower kettle of the desulfurization tower, and a flash slurry pool of the flash tank is connected with the slurry spraying layer; the liquid collecting tank, the condensation structure and the cold water spraying layer are sequentially arranged from bottom to top and are integrated in the same shell to form a secondary removal device capable of condensing particles, the secondary removal device is communicated with the top of the desulfurization tower, and flue gas channels are uniformly distributed on the liquid collecting tank; the condensation structure is formed by combining a plurality of obliquely-arranged wave-shaped condensation plates in parallel, the surfaces of the wave-shaped condensation plates are arranged in a hydrophobic mode, a plurality of protrusions and pits are arranged on the faces, facing flue gas, of the wave-shaped condensation plates, and condensable particles in the flue gas can be effectively removed.

The invention discloses a high-viscosity polymerization solution devolatilization system. The high-viscosity polymerization solution devolatilization system comprises a first-stage flash heater, a first-stage flash tank distributor, a first-stage flash tank, a second-stage flash heater, a second-stage flash tank distributor, a second-stage flash tank, a third-stage flash tank distributor and a third-stage flash tank. The invention also provides a high-viscosity polymerization solution devolatilization process which is operated in the system. According to the high-viscosity polymerization solution devolatilization system and process provided by the invention, through static flash devolatilization, dynamic flash does not need to be introduced, and the energy consumption is relatively low; in the high-viscosity polymerization solution devolatilization process provided by the invention, the glue solution content in the polymer solution at the liquid phase outlet of the first-stage flash tank is 50-75% wt, the glue solution content in the polymer solution at the liquid phase outlet of the second-stage flash tank is 85-93% wt, the glue solution content in the polymer solution at the liquid phase outlet of the third-stage flash tank can reach 99.9% wt or more, and the devolatilization efficiency is high.

The invention discloses a novel high-flash stripping tower, which relates to the technical field of sewage treatment and comprises a tower body, a plurality of groups of steam output ends are distributed in the tower body in a circumferential array manner, and each steam output end is connected with the steam input module so as to output steam into the tower body; a spraying module is arranged at the top in the tower body and is used for spraying sewage to be treated into the tower body, and a steam stripping steam pipe is also arranged on one side of the top of the tower body and is used for discharging organic matters subjected to steam stripping; each steam output end is rotationally arranged in the tower body; each steam output end is connected with a rotating module which drives the steam output end to rotate in a reciprocating mode. The phenomenon that heat exchange cannot be generated when sewage drips in the direction away from the steam output ends is effectively avoided, and the steam output ends are arranged in the circumferential direction, so that the heat exchange requirement can be met by arranging a small number of steam output ends.

The invention discloses a method and a device for removing alcamines in NMP (N-Methyl Pyrrolidone), which comprises the following steps: reacting anhydride substances with NMP containing the alcamines substances to generate NMP containing amide substances; the NMP solution containing the amide substances is rectified to remove the amide substances, and NMP with the alcohol amine substances removed is obtained; the boiling point of the product is increased in a manner that anhydride substances react with alcohol amine substances in NMP to generate amide, so that the difference value between the reacted product and the boiling point of NMP is greater than the difference value between the alcohol amine substances and the boiling point of NMP, high-purity NMP is more easily separated in a subsequent rectifying tower, the energy consumption of the rectifying tower for separating the product and impurities can be reduced, and the production cost is reduced. In addition, due to the fact that different alcohol amine additives do not need to be added additionally, universality is improved, meanwhile, the anhydride reaction belongs to amidation reaction, reaction products are more stable, free amine cannot be decomposed in the high-temperature heating process, and therefore the purity of the separated NMP can be further improved.

The invention provides a gas purification and separation method and device, and belongs to the technical field of gas purification. The method comprises the following steps: mixing process gas and methanol, and sequentially carrying out condensation treatment and gas-liquid separation treatment to obtain gas-liquid separation process gas and acidic gas condensate; carrying out methanol washing on the gas-liquid separation process gas to realize desulfurization and decarbonization so as to obtain purified gas and rich methanol (including first sulfur-containing methanol and carbon-rich methanol); carrying out first flash separation treatment on the acidic gas condensate to respectively obtain acidic gas, second sulfur-containing methanol and solid carbon dioxide; washing the solid carbon dioxide with methanol, dissolving the solid carbon dioxide in methanol, and carrying out second flash separation treatment on the obtained methanol rich in carbon dioxide to respectively obtain gas carbon dioxide and cold methanol containing carbon dioxide; the carbon dioxide-containing cold methanol can be reused for dissolving the washed solid carbon dioxide after being heated; heat exchange is carried out between the second flash separation treatment and the condensation treatment. The method has a good process gas purification and separation effect, and has the advantages of energy conservation and consumption reduction.

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

The invention relates to the technical field of sludge treatment, and discloses a sludge treatment method based on sludge reduction and ammonia nitrogen recovery, which comprises the following steps: 1) alkali thermal hydrolysis: adding alkali into sludge to adjust the pH value to 9-11, and carrying out thermal hydrolysis reaction; (2) wet oxidation: heating after reaction and discharging, and carrying out wet oxidation reaction; (3) flash evaporation: carrying out heat recovery after reaction discharging, and carrying out flash evaporation to obtain a sludge mixed solution and flash evaporation steam; (4) dewatering: performing heat recovery on the sludge mixed solution, and then dewatering to obtain a sludge cake and filtrate; and (5) ammonia nitrogen air stripping: carrying out ammonia nitrogen air stripping on the filtrate by adopting steam, wherein the filtrate after air stripping can be reused as a carbon source for sewage treatment. According to the method, the oxidative degradation efficiency of the sludge is improved through coupling of alkali thermal hydrolysis and wet oxidation treatment, ammonia nitrogen recovery and sludge reduction are facilitated, and the filtrate has the characteristics of high COD and low total nitrogen and is more suitable for being used as a carbon source.

A system and method for continuously purifying contaminated polymers, such as polypropylene, at a commercial scale. In one embodiment, the system and method involves obtaining reclaimed plastic, mixing the reclaimed plastic with a solvent, purifying the mixture through decanting and devolatilization steps, and recycling the reclaimed solvent back into the system.

The present invention discloses a device and method for producing oxalamide, and relates to the field of chemical production. The method for producing oxalamide provided by the present invention specifically comprises: mixing a methanol solution of liquid ammonia and a methanol solution of dimethyl oxalate to undergo an ammonolysis reaction, flashing, filtering, and drying the first slurry after the reaction to obtain solid oxalamide, refining the liquid phase obtained by solid-liquid separation of the first slurry to obtain byproduct methanol, and washing and absorbing ammonia in the tail gas with dimethyl oxalate and returning to the reaction system. In the process of oxalamide production, the present invention utilizes dimethyl oxalate to react with ammonia in the mixed gas generated during the reaction, and the obtained product continues to undergo subsequent ammonolysis reaction, thereby improving the utilization rate of the reaction materials; at the same time, a condenser is not used to condense ammonia and methanol before separation of alcohol and ammonia, thereby saving condensation equipment and cooling water, reducing production costs, and facilitating industrial production.

The present application relates to a kind of heat pump rectification systems based on heat shock flash circulation lift heat exchange, including rectifying tower, lift membrane reboiler, first throttling valve and heat shock heater, the secondary steam outlet of rectifying tower is connected with the heating steam import of lift membrane reboiler, the discharge port of the bottom of rectifying tower is connected with the cold side flow channel import of heat shock heater, and the cold side flow channel export of heat shock heater is connected with the feed inlet of lift membrane reboiler by first throttling valve;The vapor-liquid mixture outlet of lift membrane reboiler is connected with the column still liquid reflux port of rectifying tower, and the steam condensate outlet of lift membrane reboiler is connected with condensate tank, and the liquid outlet of condensate tank is connected with the condensate reflux port of rectifying tower side wall.The present application is combined by heat shock pressurization energy storage and throttling flash kinetic energy release, provides independent and stable lift membrane kinetic energy for lift membrane heat exchange, so that the flow pattern in the tube of lift membrane reboiler directly enters the efficient annular flow stage, improves the industrial applicability of lift membrane heat exchange technology in heat pump rectification system.

The invention relates to the technical field of polyether polyol refining, and particularly discloses a method for continuously removing light components in polyether polyol, which comprises the following steps: mixing polyether polyol and deoxygenated water; according to the method, polyether polyol is continuously added into a light component removal tower and a dehydration tower, light components and water in the polyether polyol are removed through a process combining reduced-pressure flash evaporation, bubbling temperature increasing, steam stripping and nitrogen stripping, and purified polyether polyol is obtained. The difficulty of polyol quality control in the production stage is reduced, and the content of formaldehyde, acetaldehyde and propionaldehyde in the purified polyether polyol product obtained by the method can be as low as 10 ppm or below and is at the advanced level of the industry.

The present application relates to a kind of hot exciting flash evaporation loop lift heat exchanger, including upper head, lower head, cylinder, several heat exchange tubes, the upper end surface of cylinder and the upper head form cavity I between, the lower end surface of cylinder and the lower head form cavity II between, cavity I, cavity II and the inner cavity of cylinder are not communicated with each other between, heat exchange tube is fixed in the inside of cylinder by tube sheet, the upper end of heat exchange tube is placed in cavity I and is communicated with cavity I, lower end and cavity II are communicated, cylinder includes lift section cylinder and hot exciting section cylinder, heat exchange tube includes lift section heat exchange tube and hot exciting section heat exchange tube, lift section heat exchange tube and hot exciting section heat exchange tube are communicated by throttling component between, the inner diameter of throttling component is less than the inner diameter of hot exciting section heat exchange tube.The heat exchanger of the present application is provided with a kind of hot exciting flash evaporation loop lift, will hot exciting pressurization energy storage, throttling flash evaporation kinetic energy release, loop lift heat exchange and vapor-liquid separation function integration in same equipment, solve the problem of traditional lift section heat exchanger dependence big temperature difference.

The invention belongs to the technical field of separation and recovery, and particularly relates to separation and recovery equipment and process for an R410A mixed refrigerant based on a deep eutectic solvent. The separation and recovery equipment for the R410A mixed refrigerant based on the eutectic solvent comprises an absorption tower, a first flash tank and a second flash tank, the liquid outlet end and the liquid inlet end of the absorption tower are communicated and connected through a circulating pipe; the first flash tank and the second flash tank are arranged on the circulating pipe; a first heat exchanger is arranged on the circulating pipe and between the first flash tank and the second flash tank, and a second heat exchanger is arranged on the circulating pipe and between the second flash tank and the liquid inlet end of the absorption tower; the gas outlet end of the first flash tank is communicated with the gas inlet end of the absorption tower through a communicating pipe; a third heat exchanger is arranged on the communicating pipe. By adopting the equipment and the process provided by the invention, the recovery rates of R32 and R125 in the R410A mixed refrigerant both reach 95% or above.

The present disclosure relates to a production process and device for synthesizing bisphenol A by a resin method, including a condensation reaction unit for performing a catalytic condensation reaction between phenol and acetone to generate bisphenol A, a first-stage adduct crystallization unit for mixing a concentrated solution with adduct crystals recycled after melting and then performing adduct crystallization, a liquid-phase dephenolization unit for melting an adduct to yield a bisphenol A product, a secondary adduct crystallization unit for recycling phenol and bisphenol A from a mother solution, a solvent recycling unit for recycling unreacted phenol and unreacted acetone, and discharging phenol-containing process water for sewage treatment, and a cracking and rearrangement unit for recycling the phenol from the mother solution, and convert bisphenol A, 2,4-bisphenol A and the like therein in the mother solution into the bisphenol A.

A fly ash prevention device for treating high-concentration water relates to the technical field of petrochemical engineering and comprises a flash evaporation concentration tower, a flash steam outlet is formed in the top of the flash evaporation concentration tower, and a black water outlet is formed in the bottom of the flash evaporation concentration tower; the tower wall of the flash concentration tower is connected with a black water connecting pipe, and black water tangentially enters the tower through the black water connecting pipe; a black water concentration chamber is arranged at the bottom in the flash evaporation concentration tower, the bottom of the black water concentration chamber is communicated with a black water outlet, an ascending pipe is arranged above the black water concentration chamber, a steam ascending cap is arranged on the ascending pipe, a fly ash prevention filler washing assembly is arranged above the steam ascending cap, and a gas distributor is arranged above the fly ash prevention filler washing assembly; a high-efficiency demister is arranged at the top in the flash evaporation concentration tower and is arranged on the flash steam outlet; according to the technical scheme, coal gasification and heavy oil gasification water systems are optimized, black water is concentrated, the washing environment is improved, and fly ash is prevented from being carried into a rear system.

The invention relates to a green ammonia synthesis method and system taking renewable energy as power. The method comprises the following steps: S1, providing high-temperature reaction gas; s2, raw material gas is heated through at least part of the high-temperature reaction gas, and heated raw material gas and first cooled mixed gas are obtained; s3, carrying out heating treatment on the adsorbent adsorbing the ammonia gas through the first cooling mixed gas to desorb the ammonia gas, so as to obtain desorbed gas containing the ammonia gas; s4, the desorption gas is subjected to cooling treatment and flash evaporation treatment, and liquid ammonia and first flash evaporation gas are obtained; and S5, carrying out ammonia gas adsorption on the first flash steam through the adsorbent. According to the green ammonia synthesis method taking the renewable energy source as the power, the generated ammonia gas is subjected to low-temperature adsorption and high-temperature desorption, so that efficient recovery of ammonia can be realized; and the energy utilization of the system is reasonable, the energy consumption is reduced, the operation difficulty of device operation is simplified, and the device is more suitable for application in green ammonia scenes.

The utility model relates to the technical field of hydrochloric acid desorption, in particular to a hydrochloric acid desorption device which comprises a hydrochloric acid desorption tower, and the top of the hydrochloric acid desorption tower is sequentially communicated with a primary condensing device, a secondary condensing device, a freezing device, a demister and a hydrogen chloride buffer tank; one side wall of the hydrochloric acid desorption tower is communicated with a hydrochloric acid storage tank; the side wall of the hydrochloric acid desorption tower is also communicated with a calcium chloride solution storage tank; a bottom liquid outlet of the hydrochloric acid desorption tower is communicated with a first inlet of the thermosyphon reboiler, the thermosyphon reboiler is provided with a first outlet and a second outlet, the first outlet is communicated with a liquid inlet of the hydrochloric acid desorption tower, and the second outlet is sequentially communicated with the multi-effect evaporation device and the flash separation tank; and the flash separation tank is respectively communicated with a calcium chloride solution storage tank and a second inlet of the thermosyphon type reboiler. According to the utility model, the equipment investment is reduced, the concentration efficiency of the calcium chloride solution is improved, the energy consumption is reduced, and calcium chloride is prevented from flowing back into the desorption tower to cause blockage.

The invention belongs to the field of chemical purification, and discloses a method and equipment for separating carbon tetrafluoride in nitrogen trifluoride through pressurized absorption of a deep eutectic solvent, and the method comprises the following steps: (1) increasing the pressure of nitrogen trifluoride crude gas to 0.5 MPa or above; (2) cooling the crude gas to below 40 DEG C through a crude gas feeding heat exchanger; (3) through the absorption tower, the crude gas entering from the tower kettle is in countercurrent contact with the eutectic solvent entering from the tower top, and the content of carbon tetrafluoride in the crude gas is reduced to 5 ppm or below; (4) reducing the content of carbon tetrafluoride in the eutectic solvent to be less than 1ppm through a two-stage flash tank; and (5) reducing the temperature of the eutectic solvent to be below 30 DEG C through a eutectic solvent discharging heat exchanger and a eutectic solvent cooler, and circulating the eutectic solvent back to the absorption tower from the bottom of the absorption tower. According to the method, the quality of the nitrogen trifluoride product can be improved, the carbon tetrafluoride impurity in the nitrogen trifluoride purity can be reduced to 5ppm, and the cost is low.

The invention discloses a large-diameter nested anti-scour device, and relates to the technical field of hydrometallurgy, the large-diameter nested anti-scour device comprises: a support assembly, the support assembly is arranged on a flash tank seal head, and the height of the support assembly on the flash tank seal head can be adjusted; the anti-impact cone body is formed by nesting two semi-cone bodies; the fixing assembly is used for fixing the anti-impact cone on the supporting assembly; each semi-cone sequentially passes through the inspection manhole, then the two semi-cones are nested and assembled in the flash tank to form the anti-impact cone, the inspection manhole of the flash tank does not need to be transformed, the transformation difficulty and cost are reduced, the anti-impact cone is detachably installed on the supporting assembly through the fixing assembly, and the anti-impact cone is convenient to assemble and disassemble. The height of the supporting assembly on the end socket of the flash tank can be adjusted, so that the height of the anti-impact cone can be adjusted to adapt to different liquid level control requirements of the flash tank.

The present invention discloses a process and device for producing oxalamide, and relates to the field of chemical production. The present invention provides a process for producing oxalamide, which specifically comprises: mixing a methanol solution of liquid ammonia and a methanol solution of dimethyl oxalate to undergo an ammonolysis reaction, flashing, filtering, and drying the first slurry after the reaction to obtain solid oxalamide, refining the liquid phase to obtain byproduct methanol, and washing and absorbing ammonia in the tail gas with dimethyl oxalate and returning to the reaction system. The present invention utilizes a methanol solution of dimethyl oxalate to absorb excess ammonia in the reaction process, and the reaction product is continuously used to produce oxalamide, which can not only completely separate methanol from ammonia, but also greatly improve the conversion rate of ammonia and improve the economy of the production process; at the same time, no tail gas containing ammonia is discharged, which improves the environmental protection of the production process.