23 results about "Wet oxidation" patented technology

This invention provides a semi-coke wastewater treatment device and process. The semi-coke wastewater treatment device comprises, in sequence, a semi-coke production wastewater conditioning system, an electrolytic flotation system, a freeze crystallization system, a salt phase conditioning system, a high-temperature wet oxidation system, and an ammonia nitrogen stripping and distillation system. The freeze crystallization system is connected to an aqueous phase conditioning system, a BDD electro-oxidation system, and a biochemical system. The ammonia nitrogen stripping and distillation system is connected to the biochemical system. This invention effectively solves a series of technical problems in existing semi-coke wastewater treatment devices, such as lengthy process flows, high equipment investment and operating energy consumption, and clogging of the ammonia stripping and phenol removal unit due to phenol polymerization and coking, and oil adhesion. This invention also provides a semi-coke wastewater treatment process.

The application discloses a wet oxidation catalyst, which comprises the following raw materials in percentage by weight: 0.1-2% noble metal, 1-10% graphene-based material, and the rest is a carrier, wherein the carrier is modified titanium dioxide, specifically, a rare earth-transition metal-oxygen vacancy-mesoporous three-dimensional gradient titanium dioxide carrier. The application aims at solving the technical problem of poor stability of the catalyst.

The present application relates to the technical field of combustible substance detection in ammonium nitrate, and provides an automatic device for detecting combustible substance in ammonium nitrate, which comprises a reagent storage unit for storing ammonium nitrate sample, sodium persulfate reagent and phosphoric acid reagent; a CO2 infrared analyzer is connected with the reagent storage unit, the CO2 infrared analyzer can receive the reagent supplied by the reagent storage unit and determine the content of CO2 after the combustible substance in the ammonium nitrate sample is oxidized by the sodium sulfate reagent to form CO2; a controller controls the reagent storage unit to supply the reagent to the CO2 infrared analyzer, and receives and analyzes the content information of CO2 determined by the CO2 infrared analyzer to obtain the content of combustible substance in ammonium nitrate. The automatic device for detecting combustible substance in ammonium nitrate provided by the present application realizes efficient detection of combustible substance by using wet oxidation-infrared quantitative technology.

The present application provides a kind of nitrogen-doped catalyst and catalytic wet oxidation method, catalyst is carried out by the coprecipitation reaction of soluble salt of iron, lanthanum and copper, and in rotary evaporator device, aging, dry and then mixed with nitrogen-containing precursor grinding, calcination is obtained under inert atmosphere.The specific surface area of catalyst of the present application is 60-120cm 2 ·g ‑1 , the doping amount of nitrogen is 0.5-2.0wt%.For catalytic wet oxidation, due to the doping of copper in B site, it is anchored in the lanthanum ferrite framework, reducing the loss of metal copper, making the catalyst more stable, and improving the catalytic performance of lanthanum ferrite catalyst.

This invention relates to a method for testing twin defects in pre-oxidized wafers using a particle testing machine, belonging to the field of semiconductor wafer defect detection technology. The method includes the following steps: Step 1: Thermal oxidation preparation; the grown oxide film is obtained through wet oxidation in an oxidation furnace, and the wafer is cleaned using a final cleaning machine. Step 2: Particle testing method optimization and film establishment. Step 3: Result comparison and verification; by establishing an Oxide Film model, the signal processing algorithm of the particle testing machine can distinguish between particle signals and twin signals, thereby achieving synchronous capture. Step 4: By optimizing the particle testing machine method, twin defect detection of the pre-oxidized wafer is successfully completed simultaneously during particle testing. By optimizing the particle testing machine method, synchronous detection of particle testing and twin defects is achieved, thereby improving detection efficiency, shortening the process, and maintaining the integrity of the sample.

This utility model discloses a heterogeneous catalytic wet oxidation device suitable for coking wastewater treatment, belonging to the field of wastewater treatment. The device mainly includes an equalization tank (1), a dosing device (2), a sedimentation tank (3), a high-pressure pump (4), a wastewater tubular heat exchanger (5), a reaction tower (6), a gas tubular heat exchanger (7), an air compressor (8), a condenser (9), a gas-liquid separator (10), a tail gas treatment device (11), a spray system (12), a nano-catalyst partition (13), and a micro-nano aeration device (14). The high-temperature flue gas from the coking plant is used to heat the air (or other oxygen-containing gas) to achieve waste heat utilization. The nano-catalyst partition utilizes carbon fibers to support nano-catalysts. Micro-nano aeration systems are respectively provided at the bottom and middle of the reaction tower. The oxygen mass transfer efficiency is improved through a graded cross-flow method, which enhances the decomposition of pollutants in the wastewater and effectively improves the pollutant removal efficiency in the wastewater.

The application discloses a treatment system and method for oily sludge, which comprises a pretreatment and storage module, a wet oxidation heat exchange reaction module, a conditioning water module, an oily sludge pumping module and a self-gas stripping sedimentation separation module. The pretreatment and storage module is used to remove impurities in foreign oily sludge, the wet oxidation heat exchange reaction module is used to perform wet oxidation reaction on the oily sludge to realize oxidation modification and demulsification, the self-gas stripping sedimentation separation module is used to perform three-phase separation on the oxidized oily sludge and utilize reaction heat and reaction gas in the oxidation reaction process, the reaction heat is used to make the temperature in the separation process higher than the 'wall temperature' to ensure efficient separation, and the reaction gas is used to adhere to oil droplets to accelerate the floating separation of the oil phase. In particular, carbon dioxide in the reaction gas dissolves in water to generate carbonic acid to form an acidic environment, which can promote the polymerization of oil droplets to improve the separation effect.

This invention discloses a wet oxidation catalyst for oil refinery alkali residue and its preparation method, relating to the field of catalysts. The catalyst preparation method involves dissolving activated carbon in a solution to form a mixture, stirring and reacting it under an oxygen atmosphere of 0.5 MPa–5 MPa and a temperature of 200°C–260°C, followed by filtration and drying to obtain the catalyst. During the wet oxidation reaction, the catalyst degrades organic matter and sulfur-containing compounds in the oil refinery alkali residue into CO2, H2O, and SO4 under high temperature and high pressure conditions. 2‑ This achieves the effect of reducing COD in wastewater. This application uses modified activated carbon as a wet oxidation catalyst for oil refinery alkali residue, which eliminates the problem of active component leaching. Furthermore, the active center of the catalyst is the functional group generated during oxidation, making it less prone to deactivation. The catalyst can be produced through a simple process, which is beneficial for expanding production and application.

The present application relates to the field of wastewater treatment, and discloses a method for treating waste lubricating oil wastewater, which comprises the following steps: 1) performing oil removal treatment on the waste lubricating oil wastewater, so that the oil content in the waste lubricating oil wastewater after the oil removal treatment is less than or equal to 20% of the oil content in the waste lubricating oil wastewater; 2) adjusting the pH value of the waste lubricating oil wastewater after the oil removal treatment to 7-14; and 3) performing catalytic wet oxidation on the effluent of step 2), wherein the COD of the influent of the catalytic wet oxidation is less than or equal to 100000 mg / L by mixing the effluent of the catalytic wet oxidation with the effluent of step 2). cr The method provided by the present application can efficiently remove COD cr , ammonia nitrogen and halides with high biological toxicity in the waste water, improve the biodegradability of the waste water, and is particularly suitable for treating waste water of a waste lubricating oil hydrogenation regeneration device.

The application provides a treatment method of sulfur-containing waste lye, which comprises the following steps: carrying out oil removal treatment on the waste lye, and then carrying out first-stage wet oxidation treatment; controlling reaction conditions to make 10%-90% of S 2‑ in the waste lye be converted into S2O3 2‑ ; adding a co-oxidation promoter into effluent water to carry out catalytic wet oxidation treatment, so as to realize synchronous oxidation of organic matters and S 2‑ , and the co-oxidation promoter is at least one selected from peroxide, persulfate, percarbonate and peroxymonosulfate. The application adopts two-stage wet oxidation, and the temperature of each stage is relatively low. By controlling the conditions of the first-stage wet oxidation, 10%-90% of S 2‑ in the waste lye is converted into S2O3 2‑ , and by adding a co-oxidation promoter into the second-stage wet oxidation, S2O3 2‑ reacts to generate free radicals which can accelerate the wet oxidation, so as to accelerate the degradation of the organic matters, and the purpose of treating waste with waste is realized. The reaction conditions of the two-stage wet oxidation are relatively mild, the energy consumption is reduced, and the COD removal efficiency is greatly improved.

This invention relates to a wet oxidation catalyst, its preparation method, and its application. The catalyst comprises a support and a metal oxide active component, wherein the metal oxide comprises Mo, Fe, and Co, and the relative particle size ratio of the oxidized crystal phases of the catalyst (Co...) is... 0.7 Fe 0.3 The ratio of (MoO4) / MoO3 is greater than or equal to 3.50. When using the catalyst of this invention to treat organic wastewater, the COD removal rate is high.

The invention is directed to a process for the purification of a raw hydrogen gas stream comprising hydrogen gas in an amount of 85-99%, said process comprising the step of contacting said raw hydrogen gas stream with an oxidized bed comprising an oxidized metal resulting in a waste gas stream comprising water and less than 5% hydrogen gas, and in a reduction of said oxidized metal; and a step of contacting a bed comprising a reduced metal with water to produce a purified hydrogen gas stream comprising more than 99% hydrogen gas, preferably comprising 99.97% or more hydrogen gas, and the oxidized metal. In a further aspect, the invention is directed to an apparatus suitable to carry out said process.

This invention belongs to the field of wastewater treatment technology, and particularly relates to an improved wet oxidation treatment device. The invention provides an improved wet oxidation treatment device in which a feed pump and an air compressor are connected to a heat exchanger, and an oxidation tower, heater, gas-liquid separator, turbine expander, steam turbine generator, and exhaust gas treatment device are arranged. This allows for: 1. The heater directly heats the wastewater in the oxidation tower, ensuring thorough oxidation and preventing coking, thus maximizing the continuous operation cycle of the device; 2. The high-temperature steam separated by the gas-liquid separator is converted into electrical energy by the turbine expander and steam turbine generator to power the heater. High-temperature hot pressurized water enters the shell side of the preheater, simultaneously cooling and heating the wastewater in the tube side, resulting in thorough resource utilization and energy conservation; 3. The exhaust gas treatment device purifies the waste gas, increasing the applicability of the device; 4. The heat exchanger ensures that the hot pressurized water does not come into contact with the wastewater during heating, saving treatment costs and streamlining the process, resulting in high wastewater treatment efficiency.

The application discloses a catalytic wet oxidation catalytic material and a preparation method thereof. The catalytic wet oxidation catalytic material takes acid modified montmorillonite loaded with copper oxide and optional nano ferrous sulfide as a matrix layer, and the outer surface of the matrix layer is wrapped with an active layer which is alumina loaded with nano ferrous sulfide; the matrix layer and the active layer are in a core-shell structure; the weight of the copper oxide accounts for 2-10% of the weight of the catalytic material, and the weight of the nano ferrous sulfide accounts for 5-20% of the weight of the catalytic material. The application further provides a preparation method of the catalytic wet oxidation catalytic material. The catalytic material has excellent catalytic degradation capacity for organic pollutants when used for treating organic wastewater.

The application discloses a waste alkali-activated cemented filling material for vanadium extraction tailings and a preparation method thereof. The raw material of the waste alkali-activated cemented filling material for vanadium extraction tailings comprises solid raw material, alkaline activator and water; wherein, according to mass percentage, the solid raw material comprises vanadium extraction tailings 60%-80%, gypsum 5%-15%, quicklime 5%-15%, and cement 10%-20%; the alkaline activator is obtained by wet oxidation pretreatment of ethylene alkali residue wastewater; the mass of the alkaline activator accounts for 10%-25% of the mass of the solid raw material, and the mass of the water accounts for 15%-30% of the mass of the solid raw material. The ethylene alkali residue wastewater is pretreated by wet oxidation and then used as the alkaline activator to activate the vanadium extraction tailings, so that waste is treated by waste, and the production cost is reduced; the filling material meets the filling strength requirement, the 28-day compressive strength is above 2 MPa, and the leaching liquid test result meets the environmental standard requirement.

This application discloses a method for catalytic wet oxidation treatment of sodium thiosulfate. The method includes: contacting a raw material containing sodium thiosulfate with a catalyst and an oxidant to undergo an oxidation reaction to obtain sodium sulfate; wherein the catalyst includes a support and an active component; the support is activated carbon; the active component includes a transition metal active element; the transition metal active element is selected from one to three of Mn, Fe, Co, Ni, and Cu. This method can achieve oxidation of more than 60% of 10000 mg / L thiosulfate, and the catalyst activity can be restored by water washing and regeneration after a decrease. The catalyst morphology remains good after 30 days of continuous operation.

The application discloses a treatment system and a treatment method for resource utilization of waste salt, and utilizes saturated brine to clean the waste salt, so that a large amount of organic matters and impurity ions in the waste salt enter into the salt washing water; the waste salt is separated into the salt washing water and dry salt through solid-liquid separation; the separated salt washing water with high organic matter content enters into a catalytic wet oxidation system; and the separated dry salt with low organic matter content enters into a membrane catalytic ozone oxidation unit for treatment after being salted. The application couples the catalytic wet oxidation technology and the membrane catalytic ozone oxidation technology, greatly improves the waste salt treatment efficiency, and solves the problems that, when the catalytic wet oxidation technology is used alone to treat the waste salt, the waste salt needs to be salted into a large amount of waste brine; and when the membrane catalytic oxidation technology is used alone to treat the waste salt, a large amount of water needs to be added to dilute the organic matters, thereby causing the low waste salt treatment efficiency.

The application provides a wet oxidation catalyst and a preparation method and application thereof. The wet oxidation catalyst provided by the application comprises the following components in parts by weight: 15-35 parts of a carrier, 60-85 parts of a transition metal oxide and 0.5-8 parts of an alkali metal oxide, wherein the alkali metal oxide is selected from cesium oxide and / or rubidium oxide. When the wet oxidation catalyst of the application is used to treat formaldehyde-containing wastewater, the wet oxidation catalyst has the advantages of high degradation COD removal rate and long service life.

The application discloses an antibiotic bacterial residue treatment method based on wet oxidation, aiming at realizing the synergy of harmless disposal and high-value resource recovery of antibiotic bacterial residue. The method mixes antibiotic bacterial residue and water according to a specific ratio, and then places the mixture in a pressure reactor to carry out a wet oxidation reaction under preset temperature, reaction time and oxygen pressure conditions. The method can completely degrade the residual antibiotics in the bacterial residue, achieving the harmless treatment of hazardous waste; at the same time, the solid residue amount is significantly reduced, and the organic matter in the bacterial residue can be directionally converted into volatile fatty acids mainly in acetic acid, realizing the efficient recovery of high-value carbon source. The application has both environmental benefits and economic value, and provides an efficient and feasible technical scheme for the resource utilization of antibiotic bacterial residue.

The application discloses a high-salinity wastewater double-oxidation treatment system and method, and belongs to the field of water treatment, comprising a DS catalytic oxidation device and a LDO low-temperature wet oxidation device connected in sequence; a water distributor is arranged at the bottom of the inner cavity of the DS catalytic oxidation device, and a separator is arranged at the top of the inner cavity of the DS catalytic oxidation device; the DS catalytic oxidation and the LDO low-temperature wet oxidation two-stage oxidation technology are coupled, so that the total removal rate of organic matters reaches more than 80%, the effluent can directly enter an evaporator to recycle salt, or can continue to enter a high-pressure reverse osmosis membrane to continue concentration; meanwhile, the combined process has lower operation cost, the coupling design of the two-stage oxidation also reduces the cost and implementation scale of the wet oxidation, improves the quality of the recycled salt, effectively reduces the operation risk of the evaporator, prolongs the cleaning cycle, and the subsequent device is a high-pressure reverse osmosis membrane concentration process, which can effectively reduce membrane pollution, improve the operation cycle of the membrane, and prolong the service life of the membrane.

This invention provides a method for treating wastewater from the production of p-tert-butylbenzoic acid, belonging to the field of industrial wastewater treatment. The method includes: homogenizing and adjusting the p-tert-butylbenzoic acid production wastewater; adjusting the pH to 5-6, adding hydrogen peroxide and a catalyst, and introducing oxygen-containing gas for a wet oxidation reaction; the waste gas generated from the reaction is purified in a desulfurization and denitrification reactor; the catalyst is prepared by mixing carbon-doped metal oxides TiO2@C, CuO@C, and Fe2O3@C, and uniformly dispersing them in a 1%-3% amphiphilic polymer solution under ice bath conditions to form a suspension; the suspension is subjected to a hydrothermal reaction at 100℃-150℃ for 3-6 hours, followed by static solidification, solid-liquid separation, and solid drying to obtain a catalyst precursor; the precursor is then impregnated in an amphiphilic polymer solution, dried at low temperature, and then sintered at high temperature. This invention effectively treats p-tert-butylbenzoic acid production wastewater based on a wet oxidation reaction, efficiently removing benzene and nitrogen / sulfur pollutants, thus promoting environmental protection.

This utility model relates to the technical field of gypsum board production equipment, specifically to a dust collection and purification system for a gypsum board production line. The system includes a calcination unit, a multi-stage dust removal unit, a wet purification unit, a deep treatment unit, and a recycling module. The calcination unit comprises a combustion chamber and a calcination chamber connected in series. The multi-stage dust removal unit includes a dry electrostatic precipitator and a dust grading device connected in sequence, with the inlet of the dry electrostatic precipitator connected to the outlet of the calcination chamber. The wet purification unit includes a wet oxidation tower and a cyclone-driven desulfurization tower connected in sequence, with the inlet of the wet oxidation tower connected to the outlet of the multi-stage dust removal unit. The deep treatment unit includes a wet electrostatic precipitator, with its inlet connected to the outlet of the wet purification unit. The recycling module includes a waste heat recovery pipeline connected to the hot flue gas outlet of the combustion chamber, and a wastewater membrane treatment system connected to the deep treatment unit. This utility model can achieve efficient graded dust collection, deep purification of pollutants, and resource recycling.

The application discloses a kind of thiophanate-methyl production wastewater treatment methods, belong to pesticide wastewater treatment technical field, a kind of thiophanate-methyl production wastewater treatment method, comprising the following steps: step S1: in thiophanate-methyl production wastewater copper sulfate pentahydrate is added, then is passed into catalytic wet oxidation kettle and is reacted, obtains treatment liquid I;Step S2: in treatment liquid I modified catalyst is added, carries out photocatalysis, obtains treatment liquid II;Step S3: treatment liquid II is treated by three-stage membrane distillation, obtains treatment liquid III, i.e. complete processing.The method significantly reduces the COD and ammonia nitrogen concentration in production wastewater, improves the removal rate of COD and ammonia nitrogen.