13 results about "Catalyst poisoning" patented technology

This utility model relates to the field of flue gas purification technology for industrial silicon DC and AC furnaces. To address the problems of unstable denitrification efficiency, inability to remove high-concentration NOx, catalyst poisoning, and a maximum denitrification efficiency of no more than 90% in existing technologies, this utility model provides an industrial silicon smelting flue gas purification system and production line. The system includes a first-stage waste heat boiler, a medium-high temperature SCR denitrification device, three rake soot blowers, three ultrasonic soot blowers, a second-stage waste heat boiler, a filter dust collector, and a wet desulfurization tower. The rake soot blowers remove ash from the surface of the plate catalyst bed. The industrial silicon smelting flue gas purification system and production line provided by this utility model, through the medium-high temperature SCR denitrification device and the introduction of a pre-stage waste heat boiler to regulate the flue gas temperature to the SCR temperature window, combined with the dual ash removal mechanism of rake soot blowers and ultrasonic soot blowers, prevents catalyst poisoning, blockage, and ash adhesion, thereby improving the denitrification efficiency to as high as 95%.

This invention belongs to the field of polymer materials technology, specifically relating to a production process for ultra-high molecular weight polyethylene (UHMWPE). By optimizing the catalyst system and polymerization process, this invention improves the performance and production stability of UHMWPE. A co-catalyst composed of alkylaluminum and organosiloxane modifiers, acting synergistically with external electron donors, significantly enhances catalyst activity and stereoselectivity, resulting in a more stable polymerization process, higher molecular weight and narrower molecular weight distribution, and significantly enhanced mechanical properties. The multi-stage polymerization process achieves precise control of the polymerization process through segmented temperature control, coupled with a dual-circulation heat removal system to effectively remove reaction heat, avoid localized overheating, and ensure a uniform and stable product structure. An integrated solvent recovery and molecular sieve drying system enables efficient recycling of hexane, controlling moisture content to ≤5ppm, preventing catalyst poisoning, ensuring stable continuous production, and overall improving the process's economy and reliability.

The application provides a coke oven gas purification system, wherein tar in raw coke oven gas is removed through a coking removal device, the raw coke oven gas after coking removal is pressurized by a blower and then sent to a desulfurization device to remove hydrogen sulfide in the raw coke oven gas, the coke oven gas after desulfurization is first dehydrated by a gas-liquid separator and then sequentially subjected to oil removal by an oil removal device and naphthalene removal by a naphthalene removal device to produce purified coke oven gas. The system of the application removes tar, hydrogen sulfide, naphthalene and water in the raw coke oven gas through cooperation of the above devices, realizes purification of the raw coke oven gas, and effectively avoids problems such as equipment corrosion, catalyst poisoning, pipeline blockage, low combustion efficiency and environmental pollution caused by direct utilization of the raw coke oven gas.

The utility model relates to flue gas denitration technical field especially relates to a kind of stable and efficient biomass boiler's denitration system of efficiency. Including: energy conversion unit, with biomass boiler connection;Heat recovery unit, with biomass boiler connection;Dust desulfurization unit, with heat recovery unit connection;Chimney, with dust desulfurization unit connection;SNCR processing unit, set between heat recovery unit and biomass boiler;Low-temperature denitration unit, set between chimney and dust desulfurization unit, and with energy conversion unit and heat recovery unit are connected;Detection control unit, for detecting the temperature of flue gas generated by biomass boiler and the concentration of NO X Of flue gas in dust desulfurization unit, and according to the temperature and the concentration of NO X Control SNCR processing unit operation and / or low-temperature denitration unit operation.The system greatly reduces the possibility of catalyst poisoning, not only solves the problem of frequent poisoning of catalyst in conventional SCR denitration, but also the way denitration efficiency is high, and the system is stable.

Currently, due to their inherent flammability, polyurethane reinforcement grouting materials for coal mines typically incorporate halogen-containing flame retardants during their preparation to enhance their flame-retardant properties. However, polyurethane materials containing these flame retardants remain in the finished coal, potentially causing catalyst poisoning in coal chemical production. Furthermore, halogen-containing flame retardants exhibit high smoke production and highly toxic fumes when exposed to open flames, posing a significant risk of injury to personnel. This invention addresses these drawbacks by adding our company's DMMP microcapsules and powder dispersant to the system and adjusting the formulation, thus preparing a halogen-free polyurethane reinforcement material for reinforcing coal and rock masses in coal mines. This material overcomes the aforementioned drawbacks and possesses significant practical application value.

The utility model relates to a cascade dry method coal gas dust removal, dechlorination and desulfurization device, including dust removal subassembly, dechlorination subassembly, hydrolytic component and desulfurization subassembly in proper order, dechlorination subassembly includes dechlorination tower and second feed pipe, second discharge pipe, second feed pipe is connected with first discharge pipe, and dechlorination tower is equipped with dechlorination packing, desulfurization subassembly includes desulfurization tower, fourth feed pipe and fourth discharge pipe, third discharge pipe is connected with fourth feed pipe, and desulfurization tower is equipped with desulfurization packing. Through the collaborative purification structure of multistage series connection, the efficient cascade removal of dust, chloride ion and sulfide in the coal gas is realized, not only solves the catalyst poisoning and equipment corrosion problem in traditional process, but also significantly improves the hydrolysis reaction efficiency through the heater, and the operation stability and purification effect are significantly improved.

The application discloses a raw material pretreatment feeding device for an alkylation reaction, which comprises a heavy C4 storage tank, a light C4 storage tank, a heavy C4 conveying pump, a light C4 conveying pump, a first digital flow meter and a second digital flow meter. The discharge port of the heavy C4 storage tank is connected with a first pipe, and the first digital flow meter and the heavy C4 conveying pump are arranged on the connecting pipeline at intervals. The discharge port of the light C4 storage tank is connected with the feeding port pipeline of a hydrogenation reactor, and the light C4 conveying pump and the second digital flow meter are arranged on the connecting pipeline at intervals. The device can effectively ensure the stable product quality, reduce the load rate of a butane supplement assembly, avoid frequent load increase and decrease or start and stop of the butane supplement assembly, reduce the comprehensive energy consumption of the alkylation device, and avoid catalyst poisoning and deactivation in the hydrogenation reactor for alkylation raw material pretreatment.

The application discloses a non-silicon-based porous adsorption and catalysis coupling material and a preparation method thereof. The pore structure of the non-silicon-based main material is mainly mesoporous, the pore size distribution is in the range of 5-20 nm, the specific surface area is greater than or equal to 200 m 2 / g, the pore volume is greater than or equal to 0.3 cm 3 / g, the weak alkaline site density of the surface of the main material is 0.1-0.5 mmol / g, and the weak acid site density is 0.2-0.6 mmol / g. The surface of the main material has both weak acid sites and weak alkaline sites, the weak alkaline sites can promote the hydrolysis of silicon ester compounds, a functional modification layer is arranged on the surface and in the pore channel of the main material, the functional modification layer is a modification component containing one of organic amine compounds, a phosphate group and metal ions, and the functional modification layer does not contain silicon, thereby solving the technical problems that silicon-containing pollutants are difficult to be removed efficiently in the existing waste oil treatment process, the main catalyst is easily poisoned, and the traditional adsorption material itself contains silicon and may cause secondary pollution.

The application belongs to the technical field of silica gel, and particularly relates to an antibacterial silica gel composition, a preparation method thereof and a pillow. A curing reaction is carried out through a Michael addition mechanism without a catalyst, thereby avoiding the problem that an antibacterial agent containing an N element poisons a platinum gold catalyst of addition type silica gel. An addition type antibacterial silica gel is prepared through a Michael addition reaction of an amino-terminated polyimidazole salt antibacterial agent, poly(dimethylsiloxane)-(methyl aminopropyl siloxane) and acryloyl-terminated poly(dimethylsiloxane) without a catalyst, using acryloyl-terminated poly(dimethylsiloxane) to replace a hydrogen-containing silane as a crosslinking agent, and using the amino-terminated polyimidazole salt antibacterial agent and the poly(dimethylsiloxane)-(methyl aminopropyl siloxane). Compared with condensation type antibacterial silica gel, the addition type antibacterial silica gel has high modulus, high elasticity, high tear strength and high antibacterial effect.

This application relates to the field of platinum catalysts and discloses a preparation process for an anti-poisoning platinum catalyst, comprising the following steps: adding chloroplatinic acid and sodium tetrachloropalladate to ethanol, adding carbonate, stirring evenly, adding an organosilicon vinyl dual-capping agent, and heating to react to obtain a platinum / palladium complex; washing the precipitate with water, extracting, drying and filtering, and purifying by rotary evaporation to obtain a purified platinum / palladium complex; adding an organosiloxane complex to obtain a diluted platinum / palladium complex; adding terminal ethylene silicone oil, hydrogen-containing silicone oil, and a polymerization inhibitor, stirring, vacuum degassing, and freezing to obtain an anti-poisoning platinum catalyst; the organosiloxane complex in step S4 is composed of dimethyl silicone oil and dodecylpentasiloxane in a weight ratio of 1:(0.5-1). The anti-poisoning platinum catalyst of this application is applicable to the preparation of special modified polysiloxanes containing sulfur, phosphorus, and other elements, high-performance silicone rubber, and special silicone oils. It exhibits good stability, is not prone to catalyst poisoning, and has high catalytic efficiency.

This invention relates to the field of air pollution control technology, specifically to a method for purifying exhaust gas from air pollution denitrification and desulfurization, including: cyclone spray desulfurization (using nano-scale composite absorbent slurry to efficiently absorb SO2 and remove particulate matter in a cyclone reactor), and two-stage catalytic denitrification (using nano-catalysts in a low-temperature zone to promote NO removal). x The process involves reduction, enhanced reaction in a high-temperature zone using a novel honeycomb ceramic carrier to support a vanadium-tungsten-titanium-based catalyst, deep synergistic purification (further removal of residual pollutants and aerosols through electrostatic dust removal coupled with oxidation adsorption), and an intelligent control system (real-time optimization of absorbent ratio, catalyst temperature, and flow rate parameters). This method addresses the problems of catalyst poisoning, high energy consumption, and insufficient treatment efficiency in traditional processes by modifying the absorbent with nanomaterials, employing temperature gradient catalytic reactions, and utilizing a multi-pollutant synergistic removal mechanism. The system achieves a desulfurization efficiency ≥98%, a denitrification efficiency ≥97%, and particulate matter emissions ≤10 mg / m³. 3 SO2 ≤ 35 mg / m³ 3 NO x ≤50mg / m 3 It meets ultra-low emission standards.

This disclosure provides an in-situ kinetic monitoring device and method for SCR denitrification catalyst poisoning. Through an innovative device integrating a high-precision simulated flue gas generation system, a four-dimensional synchronous monitoring unit, and a data synchronous acquisition and control system, it achieves continuous, in-situ, and multi-parameter coordinated dynamic monitoring and data acquisition of the SCR denitrification catalyst poisoning process under complex operating conditions that highly simulate real industrial flue gas. It achieves the technical effect of fully revealing the coupled poisoning mechanism, constructing a multi-parameter quantitative poisoning kinetic model, and accurately predicting the remaining catalyst life based on this model. This solves the problems of fragmented data, distorted operating conditions, and only qualitative description in existing technologies, providing key technical and data support for the scientific maintenance, replacement timing optimization, and cost reduction of industrial catalysts.