3results about How to "Regulatory selectivity" patented technology

The invention discloses a method for simultaneously preparing vinylidene fluoride and vinyl fluoride, which comprises the following step of: reacting difluoroethane under the action of a catalyst and oxidizing gas to prepare the vinylidene fluoride and the vinyl fluoride, the catalyst comprises an active component and a carrier compound, the active component comprises an active component A, or the active component comprises an active component A and an active component B; the active component A is selected from at least one of molybdenum salt, lanthanum salt, nickel salt, chromium salt, vanadium salt, platinum salt or palladium salt; the active component B is selected from at least one of sodium salt, potassium salt, cesium salt, magnesium salt or calcium salt. According to the method, difluoroethane is taken as a raw material, and vinylidene fluoride and vinyl fluoride are prepared at the same time under the action of a catalyst and oxidizing gas.

The present application discloses a kind of condensed ring aromatic hydrocarbon hydrogenation catalyst and its preparation method and application.The catalyst includes porous carrier, active metal component and auxiliary component, the active metal component is selected from at least one of La system, group VIB or group VIII metal element, the auxiliary component is selected from at least one of group IIA metal element, the catalyst, with X-ray photoelectron spectroscopy characterization, metal component M a+ (a>1) is reduced to M (a‑1)+ The ratio of M a+ Total reduction of at least 80%, preferably at least 90%.The catalyst of the present application is used for condensed ring aromatic hydrocarbon hydrogenation reaction, especially naphthalene and naphthalene hydrogenation reaction, with the characteristics of improving the conversion rate of reactants, the selectivity of target product.

The invention discloses a method for improving catalytic dehydration reaction activity of hydroxyl compounds and adjusting product selectivity. According to the method, on the premise of not increasing process condition harshness including reaction temperature, a small amount of co-feed substances are added into a reaction system, and under the conditions of not participating in reaction and not generating additional byproducts, the dehydration reaction activity of the hydroxyl compound is controllably improved, the selectivity is adjusted, olefin and ether products are prepared with high selectivity, and the method is suitable for industrial production. And the co-feeding substance in the system after the reaction is greatly different from the boiling point of the main reactant and the boiling point of the product, so that the separation process is simple, and the co-feeding substance can be cyclically fed after separation to realize reutilization.