摘要:
A selectivated molecular sieve, e.g., ZSM-22 or ZSM-23, is used as olefin oligomerization catalyst to provide product, e.g., octenes and dodecenes from butene, having a low degree of branching and hindered double bonds.
摘要:
Transition metal superoxides of formula M(O2)n, where M is a transition metal and n is equal to the valence of M, may be used as initiators for free radical polymerization, optionally, under conditions of living polymerization, with or without chain transfer agents. Polymers produced have a narrow molecular weight distribution and low polydispersity indexes when chain transfer agents and/or molecular weight controlling agents are used.
摘要:
A METHOD OF ACTIVATING A MOISTURE-CONTACTING COMPOSITION TO PRODUCE A COMPOSITION ACTIVE AS A POLYMERIZATION CATALYST WHICH INVOLVES HEATING THE COMPOSITION TO A TEMPERATURE OF MAXIMUM MOISTURE RELEASE THEREFROM AND THEN INCREASING THE TEMPERATURE OF THE COMPOSITION TO THE ACTIVATION TEMPERATURE.
摘要:
PROPYLENE IS POLYMERIZED TO ISOTATIC POLYPROPYLENE IN HIGH YIELDS AND AT A HIGH RATE WITH A CHROMIUM OXIDE EXTENDED ON A SILICA CATALYST AND ACTIVATED BY THE ADDITION OF A TETRAHYDROCARBON LEAD, TIN OR GERMANIUM. PREFERABLY THE CATALYST IS CHROMIC OXIDE EXTENDED ON SILICA AND PARTIALLY REDUCED TO FROM ABOUT 55 TO ABOUT 90%.
摘要:
Methods for synthesizing a water-soluble titanium-silicon complex are disclosed herein. The titanium-silicon complex can be utilized to produce titanated solid oxide supports and titanated chromium supported catalysts. The titanated chromium supported catalysts subsequently can be used to polymerize olefins to produce, for example, ethylene based homopolymer and copolymers.
摘要:
A method comprising contacting a support with a chromium-containing compound and a tin-containing compound to produce a catalyst precursor, and activating the catalyst precursor in a temperature range of from about 400° C. to about 700° C. to produce a polymerization catalyst. A method comprising contacting a support with a chromium-containing compound and a tin-containing compound to produce a catalyst precursor, activating the catalyst precursor in a temperature range of from about 400° C. to about 700° C. to produce a polymerization catalyst, and contacting the polymerization catalyst with ethylene in a reaction zone under suitable reaction conditions to form polyethylene wherein the molecular weight distribution of the polyethylene is broadened.
摘要:
Catalyst for the polymerization and/or copolymerization of olefins which is obtainable by application to a finely divided inorganic support and concluding calcination at temperatures of from 350 to 1050° C. and has a chromium content of from 0.1 to 5% by weight and a zirconium content of from 0.5 to 10% by weight, in each case based on the element in the finished catalyst, with the molar ratio of zirconium to chromium being from 0.6 to 5.