Patent ID: 6963018
Filing Date: 2005-11-08
Classification: C07C,C07D,Y02P

Abstract:
1. A process which catalytically dehydrogenates paraffin hydrocarbon feedstocks over a bed of metallic catalyst in a membrane based dehydrogenation reactor to produce olefins and hydrogen, with the permeate stream from the membrane reactor to consist mainly of hydrogen, olefin, and lesser amounts of permeated paraffin, with the non-permeate stream from the membrane reactor to consist of olefin, hydrogen and unreacted paraffin, with the membrane in the dehydrogenation reactor to be an inorganic membrane, inorganic-metal membrane, or metal based membrane made by one or more of the following ceramic oxides: alumina (Al titania (TiO silica (SiO zirconia (ZrO mixed with one or more of the following catalytic metals: Pt (platinum), Cr (chromium), Pd (palladium), Cu (copper), Zn (zinc), V (vanadium), Mg (magnesium), Ru (ruthenium), Rh (rhodium), Ni (nickel), Fe (iron), Sn (tin), Mo (molybdenum), or with the membrane to be made by the following metal and metal alloys: with the permeate and non-permeate streams to merge in the downstream of the membrane reactor by re-compressing the permeate stream into the same pressure with the non-permeate stream, with the merged stream to pass through a heat exchanger to reduce its temperaturte by exchanging heat and generating steam, with the cooled mixture stream to be fed into a polymerization reactor for polymerization reaction to a polyolefin, after mixing with a bypass-fed solvent in vapor, gas, or liquid phase, with the polymerization reactor to be of gas-phase, fluid bed type of of slurry-solution phase, stirred bed type, with the formed polymer to exit from the polymerization reactor in the form of particles, granules or foam, with the hydrogen produced from the dehydrogenation reaction to be used in the polymerization reactor as a chain transfer agent to regulate and reduce the polymer molecular weight, with the unreacted paraffin from the dehydrogenation reactor to be used in the polymerization reactor as a diluent, solvent or heat removing medium, with the unreacted olefin and paraffin from the polymerization to exit from the top of the polymerization reactor and enter into a membrane separator which separates the olefin from the paraffin and recycles the olefin into the inlet of the polymerization reactor and the paraffin into the inlet of the initial membrane dehydrogenation reactor, with the membrane in the downstream membrane separator to be a dense, porous, or liquid like synthetic polymer or composite type membrane containing one or more of the following metal ions, Cu (copper), Ag (silver), Cr (chromium), Fe (iron), Zn (zinc), Sn (tin), Co (cobalt), Ni (nickel), Mn (manganese), V (vanadium), Ti (titanium), Ru (ruthenium), Rh (rhodium), and with the polymer material of the membrane to consist by one or more of the following: poly(methyl methacrylate), poly(methyl acrylate), polystyrene, poly(vinyl acetate), poly(vinyl pyrrolidone), poly(vinyl carbazole), poly(vinyl stearate), poly (β-propiolactone), polydiketene, polytrioxane, poly(acrylic ester), polyacrylonitrile, polymethacrylonitrile, poly(acrylic acid), poly(methacrylic acid), poly(vinyl chloride), poly(vinylidene chloride), polytetrafluoroethylene, polychlorotrifluoroethylene, poly(vinyl fluoride), poly(vinylidene fluoride), polyimides, polycarbonates, polysulfones, polybenziimidazoles, polyphosphazenes, polyamides, polycaprolactams, parylenes, polysiloxanes.