11results about How to "Simple separation and purification process" patented technology

The invention discloses a catalyst for preparing 2-chloro-3, 3, 3-trifluoropropene through gas phase fluorination, a method and application, and solves the problems of serious carbon deposition in fluorine-chlorine exchange reaction and short service life of the catalyst. The preparation method of the catalyst comprises the following steps: introducing an assistant A and an assistant C into a chromium salt solution in a reaction container in the presence of a precipitant by adopting a co-dripping feeding mode, keeping the solution in the container to be alkaline, and generating hydroxide crystals in the cooled container; crushing the hydroxide precursor and dipping the hydroxide precursor in an auxiliary agent B solution so as to introduce an auxiliary agent B; wherein the auxiliary agent A is at least one of Fe, Co, Ni, Cu and Zn salts, the auxiliary agent B is at least one of Zr, Ce, Sn, Ti, Mn, W and V salts, and the auxiliary agent C is at least one of Mg, K, Na, Y, Hf, La, Sm and B salts.

The invention provides a titanium oxide film catalytic material for rapid high-yield synthesis of imine as well as a preparation method and application of the titanium oxide film catalytic material. The titanium oxide film catalytic material has continuous and adjustable interlayer spacing on the premise of retaining a titanium oxide nanosheet structure, and rapid and high-yield synthesis of catalytic imine is realized through a two-dimensional nano confinement channel provided by a titanium oxide nanosheet between film layers and a synergistic catalytic effect of photoexcited active oxygen species; and the synthesis of the imine is completed in a continuous mobile phase reaction mode, and the product flows out along with the mobile phase and is separated from the system, so that the separation and purification process is simplified.

This invention belongs to the field of catalyst technology, specifically relating to a nickel-based reverse piezoelectric catalyst, its preparation method, and its application. The catalyst uses metallic nickel as both the active component and support, with an oxide loaded on the nickel surface to form the reversed host, and a composite piezoelectric material as the synergistic phase. By total mass, nickel accounts for 50%–95%, the oxide for 1%–50%, and the piezoelectric material for 0.1%–20%. This invention involves mixing and reducing a nickel precursor with an oxide, followed by the composite piezoelectric material to obtain the catalyst. The catalyst utilizes the mechanical force of ball milling and the piezoelectric effect to synergistically catalyze the hydrogenation of carbon dioxide to methane, abandoning traditional high-temperature thermocatalysis. This catalyst can achieve highly efficient carbon dioxide conversion under mild conditions, with 100% methane selectivity and significantly improved reaction efficiency, showing promising application prospects in the field of carbon dioxide resource utilization.

The invention belongs to the technical field of lithium battery preparation, and particularly discloses a method for preparing battery-grade lithium fluoride by a solid-phase method, which comprises the following steps: (1) pouring a mixed extractant obtained by mixing P204 and sulfonated kerosene into a funnel, adjusting the pH value, layering after oscillation, and removing a lower-layer water phase to obtain extract liquor; (2) pouring the lithium chloride solution into the extraction liquid for extraction and impurity removal, and reserving subnatant; (3) performing rotary evaporation on the subnatant obtained in the step (2) to obtain rotary evaporation liquid; (4) carrying out vacuum drying on the rotary evaporation liquid to obtain crude lithium chloride; (5) mixing the crude product lithium chloride and ammonium bifluoride, and then reacting; and (6) heating and removing impurities to obtain the battery-grade lithium fluoride. The method is simple in process operation, does not generate extra water and is convenient for industrial production, and the prepared lithium fluoride is a battery-grade product and is high in purity.

The invention discloses a purification method and application of bacitracin A, and relates to the field of biology. According to the method for purifying the bacitracin A, preparation of the high-purity bacitracin A is achieved through liquid chromatographic separation, the purity of the bacitracin A can reach 95% or above, the separation and purification process of the high-purity bacitracin A is simplified to a great extent, the loss of reagents in the separation and purification stage is reduced, and the yield of the high-purity bacitracin A is increased. The method has the advantages of high separation purity, less organic solvent dosage, simple device, simple and convenient process operation, environmental protection and the like, and is suitable for process production.

The present invention provides a titanium oxide film catalytic material for rapid and high-yield synthesis of imines, and a preparation method and use thereof. The titanium oxide film catalytic material has a continuously adjustable interlayer spacing while retaining the titanium oxide nanosheet structure, and realizes rapid and high-yield catalytic synthesis of imines through the synergistic catalytic effect of the two-dimensional nano-confined channels provided by the titanium oxide nanosheets between the film layers and the active oxygen species excited by light, and the synthesis of the imines is completed in a continuous mobile phase reaction mode, and the product flows out with the mobile phase and leaves the system, simplifying the separation and purification process.

The invention provides a graphene oxide membrane material and a method for selectively catalyzing an ammonolysis reaction of an epoxy compound by using the graphene oxide membrane material. Through a mild heat treatment procedure, the mixed sp2-sp3 hybrid GO phase is promoted to be converted into different oxidation regions and graphite regions, and ordering of the graphite regions is achieved. The ordering degree is adjusted by regulating and controlling the heat treatment temperature and corresponds to the graphite domains with different numbers and sizes, so that the content of the graphite domains is adjusted. The efficient catalysis of the ammonolysis reaction of the epoxy compound is realized at room temperature in a continuous mobile phase reaction mode by utilizing the stabilizing effect of a two-dimensional nano confinement channel provided by the graphene oxide nanosheet between membrane layers and a graphite domain on the surface of the interlayer nanosheet on an intermediate and combining the synergistic catalytic effect of an acidic catalytic site; the highest reactant conversion rate can reach 100%, the highest reaction zone selectivity can reach 100: 0, the configuration of the obtained main product is opposite to that of the raw material, and the product does not need to be separated and purified and is environment-friendly.

The application relates to the technical field of inorganic chemical synthesis, in particular to a sodium carbonate preparation method based on ternary synthesis technology. The method takes sodium chloride, liquid ammonia and carbon dioxide as ternary raw materials, and through a'segmented carbonization-gradient temperature control crystallization-CO2 closed loop recovery-mother liquor optimization treatment' synergistic process, first, uniform crystal nuclei are induced through low-temperature pre-carbonization, then, sufficient reaction is promoted through medium-temperature deep carbonization, and the crystal structure is optimized by combining gradient cooling crystallization and aging, and the efficient recycling of carbon, ammonia and salt resources is realized. The application improves the carbon dioxide utilization rate and the product purity, optimizes the crystal particle size uniformity, reduces the energy consumption and the environmental protection load, the process is stable and easy to control, and has strong industrialization adaptability, and the obtained sodium carbonate can meet the strict requirements in the fields such as food processing, and has economic and environmental benefits.

The invention relates to the technical field of separation and purification, and discloses a salidroside separation and purification method which comprises the following steps: (1) filling macroporous resin serving as a filler into an organic medium-pressure-resistant chromatographic column, and mounting the organic medium-pressure-resistant chromatographic column at a chromatographic column position of a high performance liquid chromatograph; (2) dissolving the salidroside crude product, adjusting the pH value of the salidroside crude product, and taking the salidroside crude product as a loading solution; (3) loading the loading solution to an organic-resistant medium-pressure chromatographic column, adopting a high performance liquid chromatograph as a liquid conveying system, eluting the loading solution by adopting an ethanol water solution, and collecting eluent in sections; and the macroporous resin is macroporous resin LX-32. The provided separation and purification method can rapidly obtain a high-purity salidroside product, the separation and purification process is simple and convenient, the purity is high, the recovery rate is large, and the problems that a large-scale industrial extraction and separation method in the market is immature, the process is complex, the stability is low, the recovery rate is low, the number of repeated use times is low, and the extraction rate is low can be effectively solved.

This invention belongs to the field of haloalkanes preparation, specifically relating to a method and apparatus for preparing perfluoroalkanes. The method for preparing perfluoroalkanes includes the following steps: [The text abruptly ends here, so the translation stops.] 2‑4 Alkanes and fluorine undergo a substitution reaction in the presence of a catalyst, wherein the catalyst is a transition metal or its fluoride. The reacted gas is then washed with water to remove impurities, dried to remove water, and purified by distillation to obtain perfluoroalkanes. This invention utilizes a high-temperature catalytic fluorine substitution process, followed by water washing to remove fluorine impurities. The catalyst used is transition metal particles or transition metal fluoride particles, which have a simple structure and low cost. The separation and purification process is simplified and effective, effectively reducing the industrial production cost of perfluorobutane and other perfluoroalkanes.

The application discloses a preparation method of a cerium oxide supported palladium catalyst and application of the catalyst in a solvent-free catalytic hydrogenation reaction of squalene, and belongs to the field of catalyst preparation and application. The catalyst takes cerium oxide as a carrier, and palladium is loaded through a deposition precipitation method to form a high-dispersion cerium oxide supported palladium catalytic system. The synergistic effect between the cerium oxide and the palladium significantly improves the hydrogenation efficiency and selectivity of the catalyst, and the catalyst is suitable for the catalytic hydrogenation reaction of squalene under a solvent-free condition. Compared with a traditional Pd / C catalyst, the prepared catalyst has higher activity, and the preparation method is simple, low in cost, and capable of efficiently catalyzing the hydrogenation of squalene under a solvent-free condition.