18results about How to "Easy to desorb" patented technology

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

The invention provides a catalyst, a preparation method and a method for efficiently synthesizing 3-methylpyridine, and belongs to the technical field of organic synthesis.2-methylvaleronitrile is subjected to a hydrogenation dehydrogenation reaction under the action of the catalyst, and a product 3-methylpyridine and a byproduct amino-3-methylpyridine are prepared. According to the present invention, the 3-methylpyridine is directly prepared by using the 2-methylglutaronitrile as the raw material and carrying out the hydrogenation reaction and the dehydrogenation reaction under the action of the same catalyst, such that the synthesis route is simple and efficient, the product selectivity is high, no intermediate by-product or impurity is generated, the metal element doped in the catalyst system is economical, efficient and easily available, the catalyst activity is extremely high, and the method is suitable for industrial production. Compared with other technologies, complicated rectification, separation and purification procedures are not needed, the economic benefit is greatly improved, and industrial mass production can be realized.

The present invention discloses an ozone decomposition catalyst with excellent low temperature activity and water resistance, and a preparation method and application thereof, which belongs to the field of ozone catalytic removal. The catalyst is a highly active nitrogen-doped MnO2 catalyst and a highly dispersed loaded noble metal catalyst, wherein the active component of the loaded catalyst is selected from at least one of Pd and Ag. The catalyst has a high activity at 600,000 h. ‑1 , 25 ℃, 15ppmO3, high relative humidity (RH=95%), it has excellent ozone decomposition activity and stability. The catalyst is expected to be used in the field of near-ground, sewage ozone oxidation exhaust purification or aircraft cabin ozone catalytic removal.

The present application relates to the technical field of ozone compression, and in particular to a high-purity ozone concentration process and device for cleaning and etching of semiconductor materials, which includes the following steps: gas compression: compressing the gas to form a pressurized initial gas; adsorption separation: passing the pressurized initial gas into the ozone concentration device, and balancing the concentration of the pressurized initial gas, setting two layers of adsorbent to jointly adsorb ozone, and during adsorption, adjusting the relative positions of the two layers of adsorbent, changing the gas flushing position, and forming a combination of fixed adsorption and flow adsorption; desorption: separating ozone and compressing to form high-purity ozone concentrated gas; wherein the device includes: a tower body, an adsorbent layer, an air inlet pipe for gas supply, an exhaust pipe for exhaust, a sealing plate sliding in the air inlet pipe for adjusting the air supply of the air inlet pipe, a sliding mechanism for driving the sealing plate to slide, and an exhaust module for separating and desorbing ozone. The present application has the effect of reducing the impact on the purity of the ozone concentrated gas.

The present invention relates to the technical field of waste gas treatment, and specifically discloses an RTO organic waste gas treatment type environmental protection equipment, comprising a purification box fixedly arranged on the top of a base, a purification mechanism arranged in the purification box for purifying the organic waste gas in an emergency situation, and an opening and closing mechanism arranged at the bottom of the purification box for controlling the flow channel of the organic waste gas. The present invention controls the flow channel of the organic waste gas by cooperating with the purification mechanism and the opening and closing mechanism, so that the activated carbon at different positions alternately contacts with the organic waste gas, thereby alternately adsorbing and filtering impurities in the organic waste gas, which is convenient for continuous filtering and use of the organic waste gas. By arranging the activated carbon as a whole in the purification box, the traditional insertion from the outside into the purification box, which causes leakage of organic waste gas due to problems such as aging of the seal at the connection, is avoided, and the installation and replacement of the activated carbon are convenient for long-term use.

The invention discloses a method for improving the recovery rate of reground and reseparated copper of pyrrhotite-containing copper ore copper middling. The method comprises the following steps: S1, crushing and grinding raw ore and mixing pulp; s2, primary roughing of ore pulp; s3, primary scavenging is conducted on roughing tailings in the S2; s4, primary concentration is conducted on the copper rough concentrate obtained in the step S2; s5, performing secondary scavenging on the tailings subjected to primary scavenging in the step S3; s6, the middlings 1 obtained in the S3 and the selected tailings obtained in the S4 are combined and then subjected to ore grinding again; s7, the middling ore pulp obtained in the step S6 is subjected to re-separation; s8, scavenging the separated crude tailings obtained in the step S7; s9, the separated rough concentrate obtained in the step S7 is finely selected; s10, the separated middlings obtained in the step S8 and the step S9 and the separated refined tailings are combined and returned to the step S7; s11, the tailings 1 obtained in the step S5 and the tailings 2 obtained in the step S8 are combined and then subjected to magnetic separation through a magnetic separator, and magnetic concentrate and total tailings are obtained; and S12, the magnetic concentrate obtained in the step S11 is subjected to size fraction grading, the magnetic concentrate with the size fraction ranging from 0.25 mm to 0.18 mm is obtained, and the process returns to the step S7. According to the method, the recovery effect of micro-fine particle copper is effectively improved through migration of coarse particles in the magnetic concentrate.

The application discloses a kind of fibrous felt that can be all-weather fast recovery high viscosity crude oil, preparation method and its application.The fibrous felt includes the fibrous substrate formed by profiled cross-section fiber, and the binder layer, functional layer and hydrophobic coating sequentially loaded on its surface;Functional layer is used to generate Joule heat when energized and generate photo-thermal effect under light;The water contact angle of fibrous felt is greater than 140°.The application also provides its preparation method and application.The application integrates photo-thermal and Joule heat effect in the same felt, realizes all-weather operation ability;Use C-shaped or Y-shaped profiled cross-section fiber, accelerate the penetration and absorption of high viscosity crude oil;Through the synergistic effect of polypyrrole layer and MXene layer, the resistance is significantly reduced and the oil absorption time is shortened.The fibrous felt of the application has simple preparation process, and is suitable for all-weather oil spill recovery in complex environment such as ocean oil spill.

The clamping device for controller production comprises a bottom plate, a connecting table is arranged at the top of the bottom plate, two sliding grooves are formed in the two sides of the inner wall of the connecting table at equal intervals, a servo motor is arranged on the left side of the connecting table, the output end of the servo motor is sleeved with a two-way lead screw, and the two sides of the middle of the two-way lead screw are each sleeved with a clamping base. And screw rod grooves are formed in the middle parts of the clamping seats in a penetrating manner. The output end of the servo motor drives the two-way lead screw to rotate, the two-way lead screw drives the two clamping seats to move towards the two ends of the controller in the sliding grooves through the sliding blocks through the two lead screw grooves, the distance between the two clamping seats is adjusted according to the diameter of the controller, and the controllers with different diameters can be clamped; and an air pump is connected with the L-shaped pipe body, so that air in the four vacuum suction cups can be sucked, the four vacuum suction cups are in a negative pressure state, the bottom of the controller is tightly sucked, and therefore the stability of the controller during clamping can be improved.

The invention provides a wide-fraction material recovery method, relates to the technical field of mineral recovery, and aims to solve the technical problem that coarse-grain clean coal runs out due to the fact that the flotation fraction of tailing slime is too wide. The wide-size-fraction material recycling method comprises the steps that tailing slime is obtained and classified into first coal slime and second coal slime, and the particle size of the first coal slime is larger than that of the second coal slime; the second coal slime is classified into third coal slime and fourth coal slime, and the particle size of the third coal slime is larger than that of the fourth coal slime; the third coal slime is subjected to first flotation, the fourth coal slime is subjected to second flotation, a flotation machine technology is adopted in the first flotation, and a flotation column technology is adopted in the second flotation; and underflow products after the first flotation are concentrated and dehydrated to form second tailing products, and overflow products after the second flotation are concentrated and dehydrated to form second clean coal products. The wide-fraction material recovery method can effectively relieve the problem of coarse grain clean coal coarse running.

The invention discloses an NdFeB magnetic powder composite modifier, a preparation method and application thereof and a preparation method of a magnet. The NdFeB magnetic powder composite modifier comprises a modification component A and a modification component B, the modified component A comprises 60-85 parts by weight of a first amide compound, 15-35 parts by weight of a second amide compound and 1-10 parts by weight of a third amide compound; and the modified component B comprises fatty acid ester and boric acid ester in a volume ratio of 1: (0.3-3). The NdFeB magnetic powder composite modifier can effectively improve the magnetic performance of a neodymium-iron-boron magnet.

The invention discloses a preparation method of a (111) interplanar spacing compressed platinum-based metal catalyst, through nitrogen atom doping modification, defect sites of a carbon nanotube are improved, then uniform dispersion of a Pt active component on the surface of a carbon nanotube carrier is improved, and a Pt-N bond is formed between N atoms and the Pt component, so that not only is the Pt loading capacity improved, but also the catalytic activity of the catalyst is improved. The stability of the Pt active component can be effectively improved; according to the present invention, the prepared (111) interplanar spacing compressed Pt-based metal catalyst can be used as the active site, such that the (111) crystal plane compression effect of the Pt-based electrocatalyst is achieved, the oxygen reduction intermediate binding energy is weakened, and the H2O is easily desorbed on the surface of the catalyst so as to improve the electrocatalytic activity of the catalyst, and the prepared (111) interplanar spacing compressed Pt-based metal catalyst can be used as the PEMFC cathode catalyst so as to reduce the energy barrier in the oxygen reduction reaction, and improve the oxygen reduction reaction efficiency; the binding energy of an oxygen reduction intermediate is weakened, and the desorption rate of H2O on the surface of the catalyst is accelerated, so that the overall efficiency of the PEMFC is improved.

The present invention provides a carbon dioxide absorbing composition containing an ionic species containing a cyclic ammonium cation and a method for separating carbon dioxide using the carbon dioxide absorbing composition, the carbon dioxide absorbing composition of the present invention having high thermal stability and chemical stability and having an excellent carbon dioxide absorbing effect. In addition, the method for separating carbon dioxide using the carbon dioxide absorbing composition is very effective for desorption of carbon dioxide, and the carbon dioxide absorbing composition can be reused, thus being a very economical method.

The invention belongs to the technical field of catalysts, and particularly relates to a hydrophobic copper bismuth catalyst and a preparation method thereof. The method comprises the following steps: carrying out coprecipitation on active components to obtain a precursor 1, (2) carrying out hydrophobic modification on the precursor 1 to obtain an intermediate 2, and (3) carrying out spray drying on the intermediate 2 to obtain the catalyst. The copper-bismuth catalyst is a carrier-free catalyst, after the surface of the copper-bismuth catalyst is subjected to hydrophobic modification, enrichment of raw materials acetylene and formaldehyde on the surface of the catalyst can be promoted, the reaction rate is increased, diffusion of a hydrophilic reaction product 1, 4-butynediol to a water phase is facilitated, and generation of side reaction polyacetylene is inhibited. The catalyst has the characteristics of high activity, high selectivity and the like.

The present invention provides a carbon dioxide absorbing composition containing an ionic substance containing a spiroammonium cation and a method for separating carbon dioxide using the carbon dioxide absorbing composition, the carbon dioxide absorbing composition of the present invention having high thermal stability and chemical stability and having an excellent carbon dioxide absorbing effect. In addition, the method for separating carbon dioxide using the carbon dioxide absorbing composition is very effective for desorption of carbon dioxide, and the carbon dioxide absorbing composition can be reused, thus being a very economical method.

The present invention relates to the field of bioengineering technology, and specifically discloses a method for extracting high-purity nisin, the extraction method comprising: after activating nisin with an activation medium, transferring the activated strain into a seed medium for cultivation to obtain a seed liquid, inoculating the seed liquid into a fermentation medium, and obtaining a nisin fermentation liquid after the cultivation is completed; filtering the nisin fermentation liquid, adding a macroporous adsorption resin for static adsorption under stirring conditions, and washing with purified water after complete adsorption to obtain a saturated adsorption resin; pouring the saturated adsorption resin into a resin column, adding a desorbent for dynamic desorption to obtain a desorbent; adding sodium chloride to the desorbent for salting out, layering, filtering, rotary evaporation, and low-temperature drying to obtain the obtained product. The fermentation liquid Nisin obtained by the present invention has a high yield, is thoroughly desorbed by a composite desorbent, has a high total extraction yield of Nisin, has high purity, high color whiteness, and low variability.

This invention provides a method for preparing a metal-organic framework adsorbent, belonging to the field of adsorbent technology. The invention includes the following steps: dissolving a metal ion salt and an organic ligand in an organic solvent, controlling the reaction temperature and time, centrifuging, washing, and vacuum drying to obtain the metal-organic framework adsorbent; the organic ligand contains one or two of amino, carbonyl, carboxyl, sulfonic acid, and hydroxyl groups; the adsorbent selectively adsorbs glucagon-like peptide-1 analogs. This invention synthesizes a metal-organic framework adsorbent by combining a metal ion salt with an organic ligand containing groups such as amino, carbonyl, carboxyl, sulfonic acid, and hydroxyl groups. It utilizes the charged portion or specific groups in the organic ligand to form hydrogen bonds, ionic bonds, van der Waals forces, and chelation with glucagon-like peptide-1 analog molecules, achieving highly efficient and selective adsorption of glucagon-like peptide-1 analogs, exhibiting high adsorption capacity, fast adsorption rate, and good adsorption stability.

The invention provides a carbon dioxide trapping material containing charged hydration clusters as well as a preparation method and application thereof, and relates to the technical field of environmental governance, direct air trapping and carbon trapping materials. The carbon dioxide trapping material comprises a porous carbon material and charged hydration clusters loaded on the surface or in pores of the porous carbon material, the charged hydration clusters are OH-(H2O) n, and n is 1-7. The invention provides a new application of the OH-(H2O) n charged cluster for capturing atmospheric CO2 at normal temperature and normal pressure for the first time, and breaks through the dependence of the traditional DAC technology on high-temperature regeneration. At present, no research proposing that the OH-(H2O) n charged cluster is used for CO2 trapping exists. The invention provides a brand new technical path for low-energy-consumption and sustainable direct air trapping.