5 results about "Piperylene" patented technology

The application discloses a catalyst for preparing n-pentene by hydrogenation of piperylene, which comprises a carrier alpha-Al2O3 modified by a metal M, an active noble metal and a Lewis acid supported on the carrier alpha-Al2O3, wherein the active noble metal is Pd; the mass percentage of the metal M in the catalyst is 0.8-2% according to 100%, the metal M is at least one metal selected from W, V or Ga, the mass percentage of the active noble metal Pd is 0.05-0.08%, the mass percentage of the Lewis acid is 0.06-0.3%, and the rest is the carrier. In addition, the application also discloses a preparation method of the catalyst and application of the catalyst in production of n-pentene; and the catalyst can keep high catalytic activity and n-pentene selectivity in a long-time reaction process.

The invention discloses a method for refining polymer-grade m-pentadiene. The method comprises the following steps: carrying out selective hydrogenation reaction on a crude m-pentadiene material to remove alkyne so as to obtain an alkyne-removed m-pentadiene intermediate material; mixing the deacetylated m-pentadiene intermediate material with cyclic ketone, alcohol and organic alkali, and carrying out reactive distillation to remove cyclopentadiene so as to obtain decyclized m-pentadiene; and refining and purifying the decyclized m-pentadiene through water washing and extractive distillation to obtain the decyclized m-pentadiene. The obtained polymer-grade pentadiene product is high in purity, the content of impurity cyclopentadiene in the polymer-grade pentadiene product is lower than 1ppm, and the content of impurity alkyne in the polymer-grade pentadiene product is lower than 20ppm.

The present application relates to a kind of methyl tetrahydrophthalic anhydride continuous production process and device, the present application adopts piperylene segmented feed, isoprene is first with a part of piperylene and maleic anhydride pre-synthesis reaction at low temperature, then continue to react with another part of piperylene at higher temperature, reduce isoprene self-polymerization, using column tube heat exchanger to improve synthesis efficiency, heater and mixer are set on external circulation pipeline to carry out temperature control to reactor, using the method that reactor synthesis product carries fresh raw material and circulates into reactor to prevent fresh carbon five and anhydride aggregation self-polymerization to reduce side reaction, no high polymer slag is generated.

The application belongs to the technical field of petroleum resin, and provides a preparation method of C5 petroleum resin, which comprises the following steps: S1, 3.2-3.5 g of a catalyst and 160-175 g of a functional reagent are added into a reactor and heated in a 50 DEG C water bath; when the temperature reaches 45 DEG C, a mixed solution is added dropwise into the reactor, and constant temperature is maintained to obtain a base resin solution; the mass of the catalyst is 1.2-1.5% of the mass of the mixed solution; the mixed solution is composed of piperylene and alpha-methylstyrene, and the mass of the alpha-methylstyrene is 10.7-11.2% of the mass of the mixed solution; the functional reagent is prepared by dissolving hydrogenated rosin glyceride in a solvent; S2, after the base resin is sequentially subjected to alkali washing and water washing, an antioxidant is added to obtain an intermediate resin solution; and S3, the intermediate resin solution is subjected to distillation, and the C5 petroleum resin is obtained.

This invention discloses a transparent, fully hydrogenated polystyrene-isoprene resin and its preparation method, which is obtained by the complete hydrogenation of the following block copolymer: wherein S1 and S2 are styrene homopolymer blocks, and SP is a styrene and isoprene alternating copolymer block, and the hydrogenation rate of both the benzene ring unit and the isoprene unit in the block copolymer is greater than 99%. This resin exhibits good chemical stability, UV resistance, heat resistance, weather resistance, ozone resistance, as well as high toughness and high strength, making it particularly suitable for the preparation of optical, electronic, transportation, remote sensing scientific and technological equipment, packaging materials, and instrument panels.