178results about How to "Improve mass transfer coefficient" patented technology

The invention discloses a vanadium-phosphorus-oxygen catalyst, and a preparation method thereof. According to the preparation method, a nano vanadium phosphorus oxide is taken as a precursor, is subjected to activating and then moulding, or is subjected to moulding and then activating so as to obtain the vanadium-phosphorus-oxygen catalyst; grain size of the nano vanadium phosphorus oxide is less than 100nm, and by volume, particles with a grain size of 30 to 50nm accounts for 7 to 14%, particles with a grain size of 50 to 70nm accounts for 54 to 79%, and particles with a grain size more than 70nm accounts for 7 to 39%. According to the vanadium-phosphorus-oxygen catalyst prepared by taking the nano vanadium phosphorus oxide as a precursor, octahedral structure of (VO)2P2O7 is neater, catalyst structure is stable, and catalytic activity and catalyst stability are higher. When the vanadium-phosphorus-oxygen catalyst is used for catalytic preparation of maleic anhydride via oxidation of n-butane, n-butane conversion rate reaches 87 to 95mol%, and maleic anhydride selectivity reaches 72 to 84mol%.

The invention discloses a multistage-absorption-type rotating packed bed, comprising a cylindrical shell, wherein a rotating shaft is vertically arranged in the center of the cylindrical shell and is connected with a motor, and gaps are reserved between the outer circumferences of plane meshed plate filler groups and the inner wall of the shell; the rotating shaft is of a hollow structure, and a liquid inlet is arranged at the upper end of the rotating shaft; the primary plane meshed plate filler group is fixed at the upper end of the rotating shaft, the secondary plane meshed plate filler group is arranged below the primary plane meshed plate filler group and is located at the outer side of a tank wall of a central distribution tank which is fixed on the rotating shaft, and small holes are distributed on the rotating shaft on which the primary plane meshed plate filler group is arranged; a liquid collecting groove used for collecting liquid flowing downwards from a higher stage of plane meshed plate is arranged between every two stages of plane meshed plate filler groups, flow guide pipes are arranged on the grooves, and the liquid outlets of the flow guide pipes are over against the distribution tanks below the flow guide pipes; and a rotary demister is further fixed on the rotating shaft above the primary plane meshed plate filler group. The rotating packed bed can obtain higher heat transfer and mass transfer coefficients and higher dust collection efficiency under the condition of lower liquid-gas ratio.

The invention discloses a flue gas desulfurization additive, and a preparation method and application thereof. The flue gas desulfurization additive is prepared from the following components in percentage by weight: 35-40% of magnesium compound, 45-50% of buffer, 5-10% of organic acid and 1-5% of sodium salt. The preparation method is implemented by uniformly stirring and mixing the magnesium compound, buffer, organic acid and sodium salt to obtain the flue gas desulfurization additive. When being used in wet-process flue gas desulfurization, the flue gas desulfurization additive can effectively promote the absorption of SO2 and dissolution of CaCO3, thereby enhancing the limestone utilization ratio by 13-15%, shortening the desulfurization reaction time and enhancing the desulfurization rate by 4-10%. The application of the flue gas desulfurization additive enhances the desulfurization efficiency and the utilization ratio of the desulfurizer, thereby lowering the operating cost of flue gas desulfurization; and meanwhile, the invention can reduce the calcium scaling rate, thereby enhancing the system reliability.

The invention discloses a jet flow aerator, relating to an aerator and aiming to provide a jet flow aerator with high mass transfer coefficient, high dissolved oxygen speed, uniform mixing stirring and favorable oxygenated effect. The jet flow aerator comprises an air inlet pipe, a water spray nozzle, a gas-water mixing chamber, a throat section and diffusion section taper pipe, and a metal net is arranged at an outlet of a diffusion taper pipe section. The invention is used for wastewater treatment.

The invention discloses a flue gas desulfurization process and a device adopting acetylene sludge-gypsum method. The process comprises the following steps that acetylene sludge is utilized as a desulfurizing agent to carry out wet desulphurization to fuel gas to obtain pure smoke; the process in characterized in that the acetylene sludge is subjected to pulping so as to obtain an acetylene sludge solution, part of clean smoke is agitated into the acetylene sludge solution to carry out bubbling reaction, the acetylene sludge is preprocessed, and the acetylene sludge solution after preprocessing is utilized as the desulfurizing agent to carry out spraying desulfuration through rotational flow separation edulcoration. The device comprises an absorption tower, a circulating pump, a chimney and an outlet smoke channel arranged between the absorption tower and the chimney, as well as a serous fluid preprocessing tank which is internally provided with a bubbling layer and a rotational flow separating device which is connected with the serous fluid preprocessing tank and the inlet of the circulating pump, wherein the bubbling layer is communicated with the outlet smoke channel. According to the invention, the smoke after purification is preprocessed through the acetylene sludge, the quality of the desulfurization gypsum is improved, and the industrial cost is low.

The invention relates to an unpowered microbubble water device. The unpowered microbubble water device comprises a dissolved air tank and a dissolved air releaser. The water inlet of the dissolved air tank is used for being connected with a water pipe for the tap water with pressure larger than 0.15 MPA. A groove which is opposite and adjacent to the spray opening of a spray nozzle is formed in the dissolved air tank, wherein the size of the groove is matched with the size of the spray opening of the spray nozzle. A plurality of flow limiting holes are formed in a flow limiting piece in the dissolved air releaser. By ingeniously utilizing the pressure of the tap water itself and the groove matched with the spray opening, the high turbulence degree can be achieved for water flow entering the groove, the liquid film thickness of one side of an air and liquid phase interface is reduced, the mass transfer coefficient is increased, the total area of the air and liquid phase interface is enlarged, and therefore the air dissolving efficiency can be obviously improved; by means of the flow limiting piece where multiple holes are distributed, the water in the unit volume is dispersed, air release is sufficient, and the bubble water outlet effect is good. Thus, under the compression-pump-free condition, the microbubble water can be obtained as well by improving the air dissolving efficiency and the air release sufficiency, and therefore the unpowered microbubble water device which is small in size, low in cost and free of noise is provided for people.

Provided are systems, methods, and apparatus for removing materials from liquid, such as water. The system, methods, and apparatus allow for separation of neutrally buoyant materials from liquid via flotation to or near the surface of the liquid via air bubbles. The system, methods, and apparatus allow for the selective separation of an element, such as strontium, from the liquid. The system, methods, and apparatus allow for precipitating a water soluble salt or water soluble salts from water, including adding a water-miscible solvent to a water solution including an inorganic salt. And, the system, method and apparatus also allow for the separation of the precipitated salt, and for separation of the solvent from the water.

The disclosed aerobic jet-loop compactreactor (JLCR) for organic sewage treatment comprises an inside-outside jacket jet pipe and a draft tube on bottom, blends all of the jet aeration, biological fluid bed and deep-well aeration, improves the material mixing and transfer, oxygenates the sewage repeatedly, has stable effect with cost less than two thirds of common technique, and has wide application.

The invention relates to a method for enhancement of ozone oxidation degradation of pentachlorophenol in a micro channel, and belongs to the water treatment technology field and the novel high-efficiency chemical equipment field. The method is mainly characterized in that an inlet is T-shaped or Y-shaped, an internal cross section of a main channel is rectangular in shape, and oxidative degradation of a POPs typical pollutant PCP is carried out by utilizing O3 in a square or circular micro channel reactor. When the initial concentration range of the substrate is 5-150 mg.L<-1>, under experimental conditions that the ranges of the superficial gas velocity, the superficial liquid velocity, the reaction temperature, the reaction pressure, and the ozone adding amount (according to the molar concentration ratio of ozone to the substrate) are respectively 0.10-12.00 m / s, 0.050-2.00 m / s, 0.1-1.0 MPa, 15-30 DEG C and 1.2-4.0, the reaction system enables the removal rate of the substrate PCP to reach as high as 90%-100%.

The present invention discloses a vnadium-phosphorus oxide catalyst for preparing maleic anhydride through cyclohexane oxidation, and a preparation method thereof. According to the vanadium-phosphorus oxide catalyst, a nanometer vanadium-phosphorus oxide is adopted as a precursor, and is sequentially subjected to activation and forming or forming and activation to prepare the vanadium-phosphorus oxide catalyst, wherein the grain size of the nanometer vanadium-phosphorus oxide is less than 100 nm, and the grain size distribution adopting the volume as the benchmark is that the content of the particles with the grain size of 10-70 nm is 7-25%, the content of the particles with the grain size of 70-85 nm is 60-88%, and the content of the particles with the grain size of more than 85 nm is 5-15%; in the catalyst prepared by adopting the nanometer vanadium-phosphorus oxide as the precursor, the octahedron structure of the (VO)2P2O7 crystal phase is regular, the catalyst structure is stable, and the catalysis activity and the catalyst stability are high; and with the application of the catalyst of the present invention to catalyze the maleic anhydride preparation reaction through the cyclohexane oxidation, the cyclohexane conversion rate can achieve 57-70 mol%, and the maleic anhydride selectivity can achieve 65-74 mol%.

The invention relates to a multi-layer structure micro-channel mixer, which comprises a base plate and a sealing plate, wherein two sample injection liquid storage chambers, two inlet channels, two groups of fluid distribution channel nets, two groups of process fluid channels, a fluid collision mixing cavity, a fluid reinforced mixing channel and an outlet buffer chamber are arranged on the baseplate in a bilateral symmetry manner and are arranged on the two sides of the fluid collision mixing cavity. Two fluids to be mixed are respectively conveyed to two sample injection liquid storage chambers, respectively enter an inlet channel through the sample injection liquid storage chambers, enter a process fluid channel after being distributed through a multi-stage fluid distribution channel,and form two opposite impinging streams after flowing out of the process fluid channel,and after mixing, vortex or secondary flow is generated under the action that the fluid collides with a bafflingbaffle or an inner component in the mixing cavity, and finally the mixed fluid mixture flows out of the mixer through the outlet buffer chamber. The multi-layer structure micro-channel mixer has theadvantages of wide operation condition range, good mixing effect, high mass transfer coefficient, small pressure drop and low energy consumption.

A process for preparing acetamiprid includes steps as mixing N-cyano-N-methylacetamidine, anhydrous potassium carbonate, ammonium benzyltriethylchloride and dimethyl formamide in jet circulating reactor, reacting at 25-30 deg.C for 60-90 min while dropping 2-Cl-5-chloromethyl pyridine, discharging resultant, pumping filter, vacuum distillation of fitlrate for recovering dimethyl formamide, washing filtered cake with ethyl acetate, and vacuum drying. Its advantages are high selectivity and output rate, simple structure and low energy consumption.

The invention discloses a preparation method of a polytetrafluoroethylene hollow fibrous membrane for membrane absorption. The method comprises the following steps of: mixing polytetrafluoroethylene dispersed resin powder with an extrusion aid and an alcohol organic reagent; and performing compaction, extrusion, longitudinal stretching and heat setting to obtain the polytetrafluoroethylene hollow fibrous membrane for membrane absorption. According to the invention, the porosity of the prepared polytetrafluoroethylene hollow fibrous membrane can reach 60-95%, the average pore size is 0.2-1.0 micron, and the wall thickness is 0.2-1.0mm; and the polytetrafluoroethylene hollow fibrous membrane is mainly applied to a membrane absorption process and can be used for treating pollutants such as ammonia nitrogen, phenols and the like in wastewater.

The invention discloses a lithium bromide absorptive shielding electric pump for an air conditioner, comprising a pump body and a shielding motor connected with the pump body, wherein a circulation through hole is penetrated in a rotor shaft; one end of the circulation through hole is communicated with the inlet of the pump body while the other end is communicated with the inner cavity of a rear bearing pedestal; grooves are respectively arranged on an upper graphite bearing and a lower graphite bearing; the gap between a rotor shielding sleeve and a stator shielding sleeve is communicated with the cavity between a front bearing pedestal and an impeller back mouth ring through the groove on the lower graphite bearing, and communicated with the inner cavity of the rear bearing pedestal through the groove on the upper graphite bearing; and the cavity between the front bearing pedestal and the impeller back mouth ring is connected with an impeller chamber through an impeller balance hole. The lithium bromide absorptive shielding electric pump for the air conditioner greatly improves the cavitation overage, reduces the energy consumption, enhances the mass transfer coefficient and the change frequency of the lithium bromide, saves the cost and increases the efficiency of the air conditioning unit.

The invention discloses a supported-type vanadium-phosphorus oxide, and a preparation method thereof. Grain size of the supported-type vanadium-phosphorus oxide is less than 150nm, and by volume, particles with a grain size of 50 to 90nm accounts for 6 to 12%, particles with a grain size of 90 to 120nm accounts for 45 to 79%, and particles with a grain size more than 120nm accounts for 10 to 42%. The supported-type vanadium-phosphorus oxide is prepared by using an immersion circulating type impinging stream reactor. Reaction efficiency of the preparation method is high; reaction time is shortened; mass transfer effect is excellent; and the obtained supported-type vanadium-phosphorus oxide is small in grain size, concentrate in grain size distribution, and large in specific surface area. A catalyst prepared by taking the supported-type vanadium-phosphorus oxide as a precursor is used for catalytic preparation of maleic anhydride via oxidation of n-butane, n-butane molar conversion rate is high, and maleic anhydride selectivity is excellent.

The invention discloses a mixed flow type spraying propulsion air cooling tower. The inside of the tower is provided with a spraying propulsion atomization plant, a jet current catch pan, a water pipe and a screen stencil drogues from top to bottom; the screen stencil drogues is outside provided with a watering sieve plate and a watering screen stencil; the end of the inflow pipe is provided with a solid-liquid separator for separating the impurities, and the top thereof is provided with a swirl nozzle. The atomization plant is inner provided with a bottom spraying rotary atomizer and the bottom inducing draft rotating paddles, which produces spray and impels the paddles to rotate, and synchronously forms fan blade mechanical air and jet flow inducing draft to cool the heat water. As the flow of the paddles is in the same stream with the spray flow, the wind pressure is reduced; therefore the cooling air flow is greatly increased. The spray flow is collected in the jet current catch pan, and then is distributed as exiguous drops to fall down via the watering sieve plate and the watering screen stencil, while the inlet air comes in from the tower top and heat transfers with the water drops by a screen stencil air passage located at the middle part of the tower via the three ways of following current, cross current and adverse current to take the heat off. No vortex cavities and short flows are in the tower. The invention has the advantages of big air flow, sufficient mass transfer, good temperature drop, simple structure, high reliability, and low noise, which can be used for cooling sewage.

The invention discloses a liquid membrane extraction method by taking a hollow fiber composite membrane as a liquid membrane carrier. According to the liquid membrane technology, the hollow fiber composite membrane serves as the liquid membrane carrier, an extract phase is filled and attached to the gap and surface of the hollow fiber composite membrane to form the liquid membrane, a feed liquid phase solution and a reverse extraction phase respectively flow through two sides of the carrier, and the separation effect of in-step extraction and reverse extraction is realized through the liquid membrane function. The hollow fiber composite membrane consists of a braided tube layer and a polymer membrane layer; and meanwhile, the extraction phase and the feed liquid phase are fully mixed before entering the membrane by utilizing a mixer, the dispersing effect of the extraction phase liquid drops in the feed liquid phase is improved, the contact probability of the liquid membrane and the feed liquid solution is enhanced, and the mass transfer efficiency is improved. The imbalanced extraction realized by the liquid membrane technology is utilized, the problems that the liquid membrane attachment amount is small, the liquid membrane is instable, the mass transfer efficiency is low and the like in the hollow fiber supported liquid membrane and the liquid membrane updating technology are solved, the mass transfer coefficient and liquid membrane flux are improved, and the magnitude order of the mass transfer coefficient is 10-5.

The invention relates to a two-stage hydrofining method of inferior oil. The two-stage hydrofining method comprises the following steps of firstly carrying out mild hydrocracking reaction on inferior oil by virtue of a first slurry bed reactor; carrying out gas-liquid separation on the hydrogenation reaction product while reacting, delivering liquid materials into a second slurry bed reactor by virtue of a high-temperature high-pressure centrifugal pump located at the bottom of the reactor, and according to the level control of the reactor, adjusting the delivery capability of the centrifugal pump; and further carrying out hydrocracking reaction on the liquid material obtained by the gas-liquid separation by virtue of the second slurry bed reactor so as to enable easily coked components in inferior oil to be converted into light-weight oil and separated out, enable light-weight components which are easily cracked into gas in the hydrofining process to be separated and removed away and enable components which are difficult to be reacted in the inferior oil to be effectively converted. According to the method disclosed by the invention, by virtue of the two-stage slurry bed reactor, the inferior oil is subjected to gas-phase online hydrofining, the coking can be effectively avoided, the gas production rate is small, the conversion rate is high and more gasoline and diesel are obtained.

The invention discloses a vanadium-phosphorus oxide and a preparation method thereof. Based on the volume of VOHPO4.0.5H2O, the content of the vanadium-phosphorus oxide is 75 to 99 percent; phosphorus and vanadium are in the molar ratio of 0.85 to 1.35; the particle size is 30 to 120 nm; the specific surface area of the vanadium-phosphorus oxide is 110 to 230 m<2> / g. The vanadium-phosphorus oxide prepared by the method disclosed by the invention has the characteristics of small grain size, large specific surface area, and centralized grain size distribution, and is suitable to serve as a precursor of a catalyst in a reaction for preparing maleic anhydride by oxidizing n-butane. According to the method, a mass transfer effect is good, the reaction efficiency is high, the reaction time is shortened, the production capacity is high, so that the method can be used for continuous production of the catalyst.

The invention relates to a process for treating ammonia nitrogen wastewater by a gas-state membrane. The process comprises the following steps: adopting a composite discolouring agent and a heavy metal catcher to pre-treat high-concentration ammonia nitrogen wastewater, feeding high-concentration ammonia nitrogen wastewater into an air stripping tower to perform ammonia nitrogen removal, introducing stripped ammonia gas into a hydrochloric acid absorption tower to generate ammonium chloride; mixing stripped wastewater with low-concentration ammonia nitrogen wastewater to obtain waste liquor, regulating the pH value of the waste liquor to be 10.5 or more, performing ultrafiltration, introducing ultra-filtered waste liquor and absorbing liquor into the gas-state membrane assembly, controlling flow speed andthe temperature, removing ammonia nitrogen to obtain an ammonia salt solution and waste liquor with ammonia nitrogen content lower than 10 mg / L; feeding the ammonia salt solution to the air stripping tower after regulating the pH value, passing through the hydrochloric acid absorption tower to obtain ammonium chloride. The process has an ammonia nitrogen removal rate higher than 99%; the treated waste liquor meets discharge standards. In a process, the gas-state membrane is good in stability, does not generate osmotic distillation of water; and a gas-state membrane process canbe continuously performed, so that industrial implementation is facilitated.

The invention belongs to the technical field of environmental protection, and particularly relates to a device and method for flue gas cyclone jet white removal coupling absorption heat pump waste heat recovery. The device comprises a desulfurization tower, a fan, a cyclone jet, an alkali liquor tank, a liquid collecting tank, a water storage tank, an absorption heat pump and a driving heat source. According to the device and method, flue gas white removal and low-temperature waste heat recovery are coupled, so that the exhaust gas temperature can be reduced, saturated water vapor and solublesalt are condensed and separated out, and the content of the water vapor and the soluble salt in the exhausted flue gas is reduced; the cyclone jet cuts and atomizes liquid into small liquid drops, sothat the heat transfer and mass transfer coefficients of the flue gas and the liquid drops are increased; the liquid drops absorb the heat of the flue gas to become low-temperature heat source water,the low-temperature heat source water flows into the absorption heat pump to release heat and be cooled to become cooling water, one part of the cooling water is used for supplementing water for desulfurization slurry, the other part of the cooling water enters the cyclone jet to be sprayed and atomized and then absorbs the heat of the flue gas, and the process is circulated. The device is smallin occupied area, low in investment cost, free of moving components, easy and convenient to maintain and suitable for existing unit transformation.

The invention discloses compound solution of membrane absorption CO2 gas; the compound solution comprises amino alkane sulfonate and polyamino organic alcohol; the total concentration of the two components amino alkane sulfonate and polyamino organic alcohol in aqueous solution is 0.1 to 5.0mol / L, and the molar ratio of amino alkane sulfonate to polyamino organic alcohol is 1:0.5 to 1.5. Compared with the prior art, after the compound solution presented by the invention is used for the membrane absorption CO2, the performance is better than that of the traditional CO2 absorbent, such as MEA (monoethanolamine) and other components, and simultaneously, is better than that of the single amino alkane sulfonate; and the compound solution of membrane absorption CO2 gas has high mass transfer coefficient, and can stably work in a membrane contactor.

The invention relates to a strip steel surface flame cleaning method and an apparatus thereof. According to the method, a strip steel enters a strip steel heat treatment furnace, wherein the strip steel heat treatment furnace comprises an inlet seal, a flue gas preheating section, a direct fire cleaning preheating section, an outlet seal and a heating section; the strip steel enters the flue gas preheating section through the inlet seal, is subjected to countercurrent heat exchange at the flue gas preheating section through flue gas from the direct fire cleaning preheating section, and then enters the direct fire cleaning preheating section, wherein combustion nozzles are arranged inside the direct fire cleaning preheating section, and the combustion nozzle jets high temperature impact flame; the strip steel is heated to a temperature of 300-400 DEG C under effects of combustion and impact of the high temperature impact flame so as to achieve uniform heating and clean residual oil and residual iron on the surface of the strip steel; and the strip steel finally enters the heating section through the outlet seal, wherein the spouts of the combustion nozzles are slit-shaped to form uniform strip flames, and the flames are perpendicular to the surface of the strip steel to form single surface or double surface heating of the strip steel. According to the present invention, non-oxidizing heating can be achieved through controlling flame atmosphere, and residual oil and residual iron on the surface of the strip steel can be cleaned by adopting effects of combustion and impact of the high temperature impact flame.

The invention discloses a device and a method for removing methanol from a methyl tert-butyl ether cracking product. The MTBE cracking product and absorption liquid undergo cross flow-counterflow contact in a multistage airflow shear cross-flow bed; under the shear action of high-speed rotating filler, cracked gas and the absorption liquid are dispersed, coalesced and redispersed for multiple times, so that multistage absorption is realized; cracking gas is introduced to a gas inlet in the side bottom of a multistage airflow shear cross flow bed; a gas outlet in the top of the multistage airflow shear cross flow bed is connected with a purified gas section; the absorption liquid is introduced to a liquid inlet in the side top of the multistage airflow shear cross flow bed; a liquid outletin the bottom of the multistage airflow shear cross flow bed is used for draining the absorption liquid; the liquid inlet is connected with a pump; the liquid outlet of the multistage airflow shear cross flow bed is connected with a liquid-rich tank; the multistage airflow shear cross flow bed comprises a liquid distributor, a liquid collecting and redistributing device, a rotor, a stator, a driving device and a casing. According to the equipment, the gas and the absorption liquid generally make counterflow contact, so that a gas-liquid mass transfer propulsion force is greater, the purification degree of the cracking gas is improved, and the concentration of methanol in the rich solution and the utilization rate of the absorption liquid are improved.

The invention discloses a light biological carrier for water treatment, and a preparation method and application of the light biological carrier. Raw materials for preparing the light biological carrier comprise, in weight percent, 40%-50% of clay, 20%-30% of sludge, 20%-30% of perlite, 5%-15% of biomass pore-forming agents and 1%-2% of chemical pore-forming agents. The biomass pore-forming agents serve as main pore-forming agents and are made of waste biomass materials, inexpensive and easy to obtain. The prepared light biological carrier has the advantages that the density of the carrier is close to that of water, the surface of the carrier is uniformly strewn with sharp-angled projections, the carrier is large in specific surface area, high in porosity and strength and fine in stability, microbial attachment and biofilm formation are easily realized and the like.

The invention relates to the technical field of fluorine chemical engineering, in particular to an application method for preparing an electronic grade hydrogen fluoride process device. The method ischaracterized in that high-boiling residues HAsF6 and MAsF6 are produced through arsenic impurity in fluorine oxidized hydrogen fluoride, and the pure electronic grade hydrogen fluoride is separated from a multi-component composition through volatility difference of the high-boiling residues HAsF6 and MAsF6, HF and other components and multiple equilibrium processes. A rectification technical process adopts reflux liquid and upward gas to form gas and liquid countercurrent contact in a distillation tower, volatile component products with high purity can be obtained from the top of the tower, and non-volatile component products with high purity can be obtained from the bottom of the tower. The main component of tail gas produced from hydrogen fluoride rectification mainly comprises HF steam, the tail gas further comprises the following volatile components: SO2, SiF4, PF3, POF3, AsF5, SF6 and PF5, and the tail gas can be completely washed with pure water, condensed and recycled to prepare technical grade hydrofluoric acid.

The invention relates to an ultrasonic wave-pulse vacuum synergistic fish meat salting method. The ultrasonic wave-pulse vacuum synergistic fish meat salting method includes the steps of S1, slaughtering live fish to remove scales and viscera, and cutting the slaughtered fish into fish blocks with a uniform thickness prior to cold storage; S2, putting the fish blocks subjected to cold storage into a low-temperature saline solution to make the temperatures of the fish blocks and the saline solution within 4+ / -1 DEG C, and subjecting the fish blocks and the saline solution to synchronous ultrasonic treatment and pulse vacuum treatment until salting is completed. Compared with the prior art, the ultrasonic wave-pulse vacuum synergistic fish meat salting method has the advantages that the ultrasonic wave-pulse vacuum synergistic fish meat salting method is higher in mass transfer coefficient and salting efficiency through ultrasonic wave-pulse vacuum synergistic assistance in salting.

A process for preparing imidacloprid includes such steps as mixing imidazole, potassium carbonate, ammonium tetramethyl hydroxide and butanone in jet recirculating reactor, dropping 2-chloro-5-chloromethyl pyridine at 70-90 deg.C for 45-60 min, continuous reaction, cooling to 25-35 deg.C, discharging resultant, filter, vacuum distilling the filtrate to obtain coarse imidacloprid, recrystallizing, water washing, filter and baking. Its advantages are simple structure, low energy consumption, and high selectivity and output rate.

The invention belongs to the technical field of iron and steel metallurgy and the field of gas-solid heat exchange or thermal reaction, and relates to a device for reducing iron-containing materials, in particular to a suspended reduction process for iron-containing materials and an iron-containing material reducing device for implementing the process of quick heating, quick reaction and separation of powdery iron-containing materials. In the injection reducing furnace, the gas phase and the solid phase flow upwards in parallel and the gas phase and the solid phase are in full contact, with large heat-transfer coefficient and large mass-transfer coefficient, so that the iron-containing materials are reduced and dried quickly, and the retention time of material granules in the system is greatly shortened. The suspended reduction process has the advantages of high thermal efficiency of the system, low heat loss, good system stability, compact equipment installation, small size, low investment, high production capacity, high product metallization rate, controllable metallization rate within the range from 85% to 97%, and uniform product quality.

The invention relates to a multistage gas-liquid parallel flow devolatilization technology. The multistage gas-liquid parallel flow devolatilization technology is characterized in that a devolatilization tower mainly structurally comprises a tower body, a group or multiple groups of padding sections, a baffle, liquid seal devices, and a liquid distributor; materials enter the tower via the liquid distributor from the top of the tower; stripping stream is introduced or not from the bottom of the tower as required; in the padding sections, a gas and a liquid flow in parallel, and flow through a sieve tray to form a devolatilization interface so as to perform gas-liquid mass transfer. The multistage gas-liquid parallel flow devolatilization technology has the advantages of full gas-liquid contact, high gas-liquid passing capacity, no flooding restriction on two-phase load, small resistance and the like, has extremely high gas-liquid mass transfer efficiency, can be used for removing soluble gases in waste water and volatile substances in a polymer solution, and has extremely high popularization value.