4results about How to "Does not affect purity" patented technology

The application discloses a preparation method of aluminum dialkyl hypophosphite with different alkyl groups, and comprises the following steps: (1) dispersing aluminum hypophosphite solid in a low concentration in a solvent system containing alkali metal hydroxide and water, the mass ratio of the aluminum hypophosphite solid to water being 1:20-1000; under the initiation of a free radical initiator, making olefin 1 and the aluminum hypophosphite solid to have an addition reaction at 100-150 DEG C and 0.1-0.3 MPa, and controlling the consumption of the olefin 1 to be sufficient for the reaction of the aluminum hypophosphite solid, so as to prepare an aluminum monoalkyl hypophosphite solution, filtering the precipitate, and collecting the filtrate; (2) continuously feeding olefin 2 different from the olefin 1 into the filtrate, and making the aluminum monoalkyl hypophosphite and the olefin 2 to have an addition reaction under the initiation of the free radical initiator at 100-150 DEG C and 0.1-0.3 MPa, so as to obtain aluminum dialkyl hypophosphite with different alkyl groups. The purity of the aluminum dialkyl hypophosphite with different alkyl groups prepared by the application is above 99.5%.

The present application relates to polyphenyl ether material field, specifically to a kind of preparation method and application of vinyl benzyl polyphenyl ether, low molecular weight polyphenyl ether is obtained by redistribution reaction and double bond group is grafted on low molecular weight polyphenyl ether segment to obtain vinyl benzyl polyphenyl ether, make polyphenyl ether have reactivity, and reaction product is reacted with modified polyvinyl alcohol and phase transfer catalyst, can make residual vinyl benzyl halide in system and modified polyvinyl alcohol react, further purify vinyl benzyl polyphenyl ether.The preparation method of vinyl benzyl polyphenyl ether designed in the present application, not only can obtain excellent dielectric performance vinyl benzyl polyphenyl ether, but also can remove by-product salt, halogen compound and halide ion, and processing process is simple, low in cost.

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 present application relates to a method for producing polyaluminum chloride and recovering sodium chloride by using by-products of methyl phosphine dichloride production, and relates to the technical field of water treatment agents. The method comprises the following steps: crushing blocky mixed salt containing sodium tetrachloroaluminate and sodium chloride, dissolving the crushed mixed salt in water, adding sodium metaaluminate, stirring and reacting, filtering, obtaining aluminum hydroxide solid and crude salt aqueous solution; putting the aluminum hydroxide solid into water, adding hydrochloric acid dropwise under heating and stirring to adjust pH, aging, adding an adsorbent, and filtering to obtain a polyaluminum chloride solution; transferring the crude salt water into a flocculation and precipitation tank, adding an oxidizing agent to oxidize phosphorus impurities, adding sodium hydroxide to adjust pH, and adding polyaluminum chloride; obtaining preliminary refined brine after precipitation is completed, and refining the preliminary brine by membrane filtration to obtain refined brine. The present application realizes circular economy, and has the advantages of simple process, cheap and easily available raw materials, safety and environmental protection, high economic benefits, etc.