5results about How to "Strong mass transfer ability" 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.

This invention relates to the field of catalyst technology, specifically a magnesium-modified hierarchical ZSM-5 molecular sieve catalyst, its preparation method, and its application. This magnesium-modified hierarchical ZSM-5 molecular sieve catalyst is prepared using the organic template agent N,N-dimethyldipropyltriamine, exhibiting a 90° cross-linked hierarchical structure. This structure enhances the diffusion rate of reactants and products, thereby improving catalytic activity. Furthermore, it possesses a large specific surface area, a short diffusion path, and good stability. The interconnected hierarchical pores of the molecular sieve allow for full utilization of their diffusion characteristics, resulting in excellent catalytic performance in the catalytic cracking of heavy oils. Additionally, the organic template agent used in this invention is significantly cheaper than the template agents used in the synthesis of specially morphological hierarchical porous molecular sieves in current literature, effectively solving the problem of poor catalytic performance and the difficulty in widespread application due to the use of expensive template agents in existing catalysts.

The invention belongs to the technical field of electro-catalysis, and particularly discloses a three-dimensional porous array carbon electrode which comprises a multi-scale pore structure composed of micron pores and nano pores, the specific surface area of the three-dimensional porous array carbon electrode is not lower than 200 m < 2 > g < 1 >, and the pore area is not lower than 50 m < 2 > g < 1 >. The invention discloses a preparation method of the three-dimensional porous array carbon electrode and an application of the three-dimensional porous array carbon electrode in water electrolysis hydrogen production. The three-dimensional porous array carbon electrode has a large pore area, high surface roughness, super-hydrophilic and hydrophobic properties and a porous array channel, overcomes the defects of a traditional foamed nickel electrode and a slurry casting electrode in industrial application, and can realize a large-scale, low-energy-consumption and high-stability industrial-grade hydrogen production process.

The invention discloses a dynamic tubular reactor, which belongs to the technical field of chemical equipment, and comprises a cylinder and a stirring mechanism, in the stirring mechanism, a first tube plate assembly is internally provided with a first cavity; a second cavity is formed in the second tube plate assembly; two ends of the heat exchange tube are respectively connected with the first tube plate assembly and the second tube plate assembly; a backflow branch flow channel communicating with the first cavity and the second cavity is arranged in the heat exchange pipe. The stirring shaft comprises an inner tube and a second outer tube, one end of the second outer tube is fixedly connected with the second tube plate assembly, and the other end extends out of the reaction cavity and is in transmission connection with a driving mechanism; a second backflow main flow channel is arranged in the second outer pipe and is communicated with the second cavity; the inner pipe is provided with an input flow channel, and the input flow channel communicates with the first cavity. The stirring mechanism not only can stir reaction materials, but also can exchange heat for the reaction materials, and the heat exchange pipe rotates along with the stirring shaft, so that the heat exchange efficiency is extremely high.

The present invention discloses an iron phosphide active material and a preparation method and application thereof, comprising the following steps: placing a retired lithium iron phosphate positive electrode material on top of melamine under an inert atmosphere, and obtaining the iron phosphide active material after roasting. The present invention prepares the retired lithium iron phosphate battery positive electrode material into an iron phosphide active material by a one-step in-situ thermal conversion method. At the same time, by utilizing the catalytic effect of the transition metal iron element, carbon nanotubes grow on the surface of the iron phosphide active material, thereby obtaining a high pore utilization rate and connectivity, and obtaining an iron phosphide active material with a three-dimensional structure having a high specific surface area. The iron phosphide active material is used to prepare the positive electrode material of a lithium oxygen battery, providing more reactive sites for the electrochemical reaction, improving the material utilization rate, and facilitating the storage of the discharge product lithium peroxide.