2results about How to "Does not affect yield" patented technology

This invention belongs to the field of pharmaceutical chemical synthesis technology and relates to a method for the catalytic oxidation of acetate tetraenes to synthesize dihydroxy compounds. The method uses acetate tetraenes as a raw material, acetone as a solvent, Ru-X-Y as a catalyst, and sodium hypochlorite as an oxidant. Under alkaline conditions, catalytic oxidation yields the product dihydroxy compound. In Ru-X-Y, X is Pt or Pd, and Y is any one of Fe, Mn, and Cu. This invention uses solid Ru-X-Y as a catalyst, utilizing the synergistic activation and polarization properties of metals. It only requires sodium hypochlorite, which has relatively weak oxidizing power, as an oxidant to catalytically oxidize acetate tetraenes to the target product dihydroxy compound, effectively avoiding the use of strong oxidants such as potassium permanganate. This not only prevents over-oxidation and improves product yield and quality but also increases production efficiency, resulting in significant economic and social benefits.

The invention belongs to the technical field of resource recovery, and particularly discloses a method for separating rare earth and radioactive elements from a monazite alkali cake, which comprises the following steps: 1) dissolving the alkali cake to a proper pH value by using a mixed acid of hydrochloric acid and sulfuric acid; (2) adding barium chloride and an alkali cake into the acid leaching slurry until the pH is proper, precipitating radioactive elements, stirring and filtering; and 3) continuously adding the alkali cake into the filtrate until the pH value is proper, filtering to obtain a low-radioactivity rare earth chloride solution and filter residues, and returning the filter residues to the step 1) to be continuously dissolved out. According to the process method provided by the invention, efficient recovery of rare earth in the monazite alkali cake and deep separation of radioactive elements can be realized; the method has the advantages of simple operation, few added materials, high rare earth yield and good radioactive element separation effect, and develops a process route with good economic benefits and environmental protection benefits for monazite resources.