8results about How to "Guaranteed efficient selectivity" patented technology

This invention relates to the field of ore flotation technology, specifically a low-consumption, high-efficiency flotation reagent for high-calcium, fine-muddy fluorite ore, its application, and a flotation method. The flotation reagent includes a modifier, a compound depressant, a compound collector, and a frother. The modifier includes sodium carbonate; the compound depressant includes water glass, carboxymethyl starch, sodium hexametaphosphate, and sodium lignosulfonate; the compound collector includes oleic acid, oxidized paraffin soap, sodium dodecyl sulfonate, and benzoyl hydroxamic acid; and the frother includes pine oil. Through the complementary functions of the compound depressant and the compound collector, highly efficient selective inhibition of high-calcium gangue and highly selective collection of fluorite are achieved, effectively dispersing fine mud, reducing froth entrainment, and ultimately obtaining a fluorite concentrate with a stable grade ≥97.0%, meeting the quality requirements of metallurgical and acid-grade fluorite products. This reduces the negative impact of fine nuclei on flotation, stabilizes the fluorite recovery rate, and increases the fluorite recovery rate by 3-6%, achieving dual stability in grade and recovery rate.

The invention relates to the field of electro-catalytic materials, and mainly discloses a metal-metal catalyst for preparing nitrite through electro-catalytic ammoxidation and a preparation method and application of the metal-metal catalyst, and the catalyst is composed of molybdenum (Mo), nickel (Ni) and copper (Cu) in a metallic state and does not contain an oxide or hydroxide phase. The metal-metal catalyst provided by the invention shows excellent comprehensive performance in electrocatalytic ammoxidation reaction, the catalyst shows extremely low reaction starting potential in the aspect of catalytic activity, and the starting potential is only 1.36 V relative to a reversible hydrogen electrode in electrolyte, so that the energy input required by the reaction is remarkably reduced, and the energy consumption is reduced. Ammonia oxidation can be tested under milder conditions, the safety and reliability of ammonia oxidation are directly improved, efficient ammonia utilization rate and nitrite selectivity are realized, side reaction is effectively inhibited, and the catalyst is particularly remarkable in long-term operation stability.

The invention belongs to the technical field of preparation of chemical intermediates, and particularly relates to a catalyst composition and application thereof in preparation of 2-methyl-4-acetoxy-2-butenal. The homogeneous catalyst composition provided by the invention comprises the following raw materials: a noble metal homogeneous catalyst and an organic phosphine ligand. According to the catalyst composition, 2-methylene-4-acetoxybutyraldehyde can be isomerized to generate 2-methyl-4-acetoxy-2-butenal (FCA) under the condition that H2 is not used, on one hand, H2 is not used, so that a hydrogenation product of a hydroisomerization byproduct is effectively avoided; on the other hand, the homogeneous catalyst composition enables isomerization to have more efficient all-trans isomerization selectivity, all-trans 2-methyl-4-acetoxy-2-butenal with the purity larger than 99.9% can be generated, the all-trans selectivity of downstream VA is improved greatly, and meanwhile the industrial cost is greatly reduced due to the fact that the selectivity is increased.

The application belongs to the field of detection, and specifically discloses a fluorescent probe, a preparation method and application thereof; the fluorescent probe comprises a compound shown in formula (I). 2+ The fluorescent probe has high sensitivity and selectivity, is not interfered by other metal ions, has a short detection time, can be detected within 30 min, can be detected completely within 30 s at most, can realize visual detection when applied to a test strip, and can be applied to the detection of Hg 2+ in environmental samples, such as actual water samples and soil samples.

The invention discloses a La-CPAN-PEI defluorination material as well as a preparation method and application thereof, and belongs to the technical field of water treatment. The preparation method of the material comprises the following steps: performing heat treatment on polyacrylonitrile fibers in protective gas to obtain cyclized polyacrylonitrile fibers; and dispersing the cyclized polyacrylonitrile fiber, an alkali catalyst, an organic lanthanum source and polyethyleneimine in a degassed alcoholic solution, and carrying out solvothermal reaction to obtain the La-CPAN-PEI defluorination material. According to the method, the pH response characteristic of the PEI chain is utilized, the fluorine ion adsorption process is precisely regulated and controlled, and the process shows the characteristics of acid adsorption and alkali removal and dynamic balance of an intermediate pH region. The material has high adsorption capacity, excellent selectivity and simple and convenient acid-base cyclic regeneration capacity through the synergistic effect of three mechanisms of electrostatic attraction, conformation mass transfer and precipitation immobilization, and has a good application prospect in deep treatment of fluorine-containing wastewater.

The invention relates to the technical field of biomass energy chemical industry, in particular to a method for preparing alkylphenol through alkylation of phenol and isopropanol. The method comprises the following steps: step 1, carrying out calcination pretreatment on an H-Beta molecular sieve to obtain a pretreated molecular sieve; step 2, filling the pretreated molecular sieve into a fixed bed reactor, exhausting air, and preheating to 200-350 DEG C; step 3, dissolving phenol in isopropanol to obtain a mixed raw material; and step 4, pumping the mixed raw material into a fixed bed reactor to be in contact with the pretreated molecular sieve, and performing alkylation reaction under the conditions that the temperature is 200-350 DEG C, the hydrogen pressure is 0.1-1.5 MPa and the mass space velocity is 2-5h <-1 > to obtain the alkylphenol. The method can be used for efficiently preparing liquid fuel precursors (isopropyl substituted phenol) such as aromatic hydrocarbon, cycloalkane and alkyl cyclohexanol, and has a remarkable industrial application value.

The invention discloses a selective lithium extraction and green regeneration method for a waste lithium titanate battery. The method comprises the following steps: firstly, pretreating the waste lithium titanate battery to obtain black powder containing lithium titanate; then selectively leaching lithium by adopting a quaternary ammonium salt / gluconic acid / ethylene glycol-based eutectic solvent to obtain a lithium-rich leaching solution and leaching slag containing a titanium compound; the leachate is circularly used for leaching lithium in the black powder until the lithium is saturated, a saturated sodium carbonate solution is added for reaction, washing and drying are performed after solid-liquid separation, and battery-grade lithium carbonate is obtained; the leaching residues are subjected to impurity removal, washing and drying, and a titanium compound is obtained; and finally, preparing the lithium titanate negative electrode material by taking the lithium titanate and battery-grade lithium carbonate as a precursor. According to the method, a traditional strong acid leaching process is replaced with the environment-friendly green solvent, the method has the remarkable advantages that the process is simple, the solvent can be recycled, and secondary pollution is avoided, efficient selective extraction of lithium in the waste lithium titanate battery and green short-process regeneration of the lithium titanate negative electrode material are achieved, and the method has excellent industrial application prospects.

This disclosure provides a path acquisition method, apparatus, electronic device, storage medium, and computer program. The method includes: acquiring link device information of each autonomous system (AS) of a first target path; the link device information is used to characterize the cross-domain occupancy of the AS; determining a first link set based on the link device information of each AS; the first link set includes suspected conflicting links of the first target path in each AS; suspected conflicting links are links that may be occupied; acquiring at least one candidate replacement link corresponding to a suspected conflicting link based on the first link set; the AS is located in the same AS as the corresponding candidate replacement link; replacing the suspected conflicting link in the first target path with the candidate replacement link to obtain a second target path. This disclosure avoids the probability of occupancy conflicts, improves path stability, and is no longer extremely sensitive to delayed updates.