摘要:
A process for polymerizing an alpha-olefin is disclosed. The polymerization is performed in the presence of a catalyst system comprising a three-membered titanacycle. A wide variety of titanacycles can be readily prepared, making this a versatile and inexpensive olefin polymerization process.
摘要:
A single-site catalyst system useful for polymerizing olefins is disclosed. The catalyst system comprises an optional activator and a complex that incorporates a Group 3 to 10 transition metal and at least one neutral or anionic chelating pyrimidine ligand. The ligands are easy to make, and they are readily incorporated into transition metal complexes, including those based on late transition metals. By modifying the chelating groups and other substituents on the pyrimidine ring, polyolefin makers can increase catalyst activity and control polymer properties.
摘要:
Improved Group 3-11 transition-metal based catalysts and processes for the polymerization of olefins are described. Some of the ligands are characterized by a preferred substitution pattern which allows for higher productivities of highly branched olefins; substitution patterns which boost productivity or alter the polymer microstructure are also described.
摘要:
A single-site catalyst system useful for polymerizing olefins is disclosed. The catalyst system comprises an optional activator and a complex that incorporates a Group 3 to 10 transition metal and at least one neutral or anionic chelating pyrimidine ligand. The ligands are easy to make, and they are readily incorporated into transition metal complexes, including those based on late transition metals. By modifying the chelating groups and other substituents on the pyrimidine ring, polyolefin makers can increase catalyst activity and control polymer properties.
摘要:
A multistep process for the selective production of an oligomer oil having predetermined properties in which the first step involves the polymerization of a feedstock containing one or more C3 to C20 1-olefins in the presence of a catalyst comprising a bulky ligand transition metal catalyst and in which a subsequent step involves the olgiomerization of at least a preselected fraction of the product of the first step.
摘要:
Hydrogenation catalysts for aromatic hydrogenation including an organosilica material support, which is a polymer comprising independent units of a monomer of Formula [Z1OZ2OSiCH2]3 (I), wherein each Z1 and Z2 independently represent a hydrogen atom, a C1-C4 alkyl group or a bond to a silicon atom of another monomer; and at least one catalyst metal are provided herein. Methods of making the hydrogenation catalysts and processes of using, e.g., aromatic hydrogenation, the hydrogenation catalyst are also provided herein.
摘要:
Methods are provided herein for separating an aromatic compound from a lube base stock by contacting a lube base stock containing an aromatic compound with an organosilica material.
摘要:
Pyridine complex of zirconium having general formula (I): Said pyridine complex of zirconium having general formula (I) may advantageously be used in a catalytic system for the (co)polymerization of conjugated dienes.
摘要:
Methods of preparing organosilica materials, which are a polymer comprising of at least one independent cyclic polyurea monomer of Formula wherein each R1 is a Z1OZ2Z3SiZ4 group, wherein each Z1 represents a hydrogen atom, a C1-C4 alkyl group, or a bond to a silicon atom of another monomer unit; each Z2 and Z3 independently represent a hydroxyl group, a C1-C4 alkyl group, a C1-C4 alkoxy group or an oxygen atom bonded to a silicon atom of another monomer unit; and each Z4 represents a C1-C8 alkylene group bonded to a nitrogen atom of the cyclic polyurea are provided herein. Methods of preparing and processes of using the organosilica materials, e.g., for gas separation, color removal, etc., are also provided herein.
摘要翻译:制备有机二氧化硅材料的方法,其为包含至少一种式的独立的环状聚脲单体的聚合物,其中每个R 1为Z 1 O z 2 Z 3 SiZ 4基团,其中每个Z 1表示氢原子,C 1 -C 4烷基或与硅的键 另一单体单元的原子; Z2和Z3独立地表示与另一个单体单元的硅原子键合的羟基,C1-C4烷基,C1-C4烷氧基或氧原子; 并且各Z4表示与环状聚脲的氮原子键合的C1-C8亚烷基。 本文还提供了使用有机硅材料的方法,例如用于气体分离,除色等。
摘要:
A process is disclosed for the preparation of zinc alkyl chain growth products via a catalyzed chain growth reaction of an alpha-olefin on a zinc alkyl, wherein the chain growth catalyst system employs a group 3-10 transition metal, or a group 3 main group metal, or a lanthanide or actinide complex, and optionally a suitable activator. The products can be further converted into alpha-olefins by olefin displacement of the grown alkyls as alpha-olefins from the zinc alkyl chain growth product, or into primary alcohols, by oxidation of the resulting zinc alkyl chain growth product to form alkoxide compounds, followed by hydrolysis of the alkoxides.