39results about How to "Increase the specific surface area of ​​the reaction" patented technology

The invention relates to a method for preparing a conductive polymer based electromagnetic composite material. The method comprises the following steps of: respectively preparing magnetic powder suspending liquid, monomer dispersion liquid and an initiator solution, filling the magnetic powder suspending liquid, the monomer dispersion liquid and the initiator solution into three injectors, and continuously injecting the magnetic powder suspending liquid, the monomer dispersion liquid and the initiator solution into respective microtubules at a constant pushing speed respectively; mixing the reaction solutions in a reaction tube after the reaction solutions flow through the microtubules, and performing fluid reaction polymerization at room temperature under ultrasound assistance; and performing magnetic separation, washing, and freeze-drying on the product to obtain the conductive polymer based electromagnetic composite material. The method is simple, low in energy consumption, good in repeatability, capable of realizing continuous and fast preparation of the product, and easy to realize industrial production; and the prepared conductive polymer based electromagnetic composite material is uniform in particle size, large in specific area, stable in physical and chemical properties, difficult to agglomerate, good in dispersity and excellent in electromagnetic comprehensive performance, and has a good application prospect.

The invention provides a ceftiofur ester type compound or halogen salt thereof as well as a preparation method and application of the ceftiofur ester type compound or the halogen salt thereof. The ceftiofur or sodium salt thereof takes anion exchange resin as a reaction carrier, and an esterification reagent, such as chloro(iodo)methyl pivalate, 1-iodoethyl isopropyl carbonate, 1-iodoethyl cyclohexyl carbonate, methoxyethoxychloromethyl ether, 4-chloromethyl-5-1,3-dioxole-2-one, 1-iodoethyl cyclohexyl carbonate, 2-chlorotriethylamine and hydrochloride thereof, is added into an organic solvent;then ultrasonic reaction is carried out to prepare an ester type compound corresponding to the ceftiofur; furthermore, the halogen salt of the ceftiofur is prepared. In a preparation process, DMF (Dimethyl Formamide) is not used so that the pollution is reduced; the anion exchange resin is used as the reaction carrier so that the reaction speed is improved, a technology is saved and the preparation method is simple.