Patent ID: 8076524
Filing Date: 2011-12-13
Classification: C07C,Y02P

Abstract:
1. A method for preparing comonomer product from an olefin feed comprising: contacting said olefin, a preformed catalyst having an olefin selectivity of at least 90 mol % to a desired comonomer product, and a solvent and/or diluent as a reaction mixture in a reactor under reaction conditions sufficient to produce an effluent comprising said desired comonomer product, wherein said desired comonomer product is an alpha-olefin oligomer, and said solvent and/or diluent has a boiling point less than that of said desired comonomer product at a reactor pressure; and controlling the reaction temperature to between 80° C. and 90° C. by evaporatively cooling said reactor by vaporization of said solvent and/or diluent within the reactor by adjusting the reactor pressure from about 120 psia (8.44 kg/cm 1) a ligand represented by the formula: wherein: N is nitrogen; R T is a bridging group, preferably represented by the formula -(T′R J is an optionally substituted six-membered heterocycle, containing at least one nitrogen atom as part of the ring, or J is an optionally substituted five-membered heterocycle, containing at least one nitrogen atom as part of the ring; or a ligand represented by the formula: wherein: P is phosphorus; each of R each of Z Q is a bridging group selected from the group consisting of optionally substituted hydrocarbyl having from 2 to 20 carbon atoms; 2) a metal precursor compound characterized by the general formula Cr(L) n where each L is independently selected from the group consisting of halide, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heteroalkyl, substituted heteroalkyl, heterocycloalkyl, substituted heterocycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkoxy, aryloxy, hydroxy, boryl, silyl, amino, amine, hydrido, allyl, diene, seleno, phosphino, phosphine, ether, thioether, carboxylates, thio, 1,3-dionates, oxalates, carbonates, nitrates, sulfates, ethers, thioethers, and combinations thereof, wherein two or more L groups may be combined in a ring structure having from 3 to 50 non-hydrogen atoms; and n is 1, 2, 3, 4, 5, or 6; and 3) optionally, one or more activators.