The present invention relates to a catalyst system for olefin oligomerization, and a method for oligomerizing olefins using the same. The catalyst system for olefin oligomerization according to the present invention exhibits high selectivity to 1-hexene and 1-octene while having excellent catalytic activity, thereby enabling more efficient preparation of alpha-olefins.

The present invention relates to a 1-octene composition. The 1-octene composition according to the present invention is prepared by ethylene oligomerization and comprises a high content of 1-octene and monomers useful for copolymerization of 1-octene at the same time.

The present invention relates to a 1-octene composition. The 1-octene composition according to the present invention is prepared by ethylene oligomerization and comprises a high content of 1-octene and monomers useful for copolymerization of 1-octene at the same time.

The invention relates to oligomerization of olefins, such as ethylene, to higher olefins, such as a mixture of 1-hexene and 1-octene, using a catalyst system that comprises a) a source of chromium b) one or more activators and c) a phosphacycle-containing ligating compound. Additionally, the invention relates to a phosphacycle-containing ligating compound and a process for making said compound.

A process for the preparation of a compound of formula (V): ##STR00001## comprising at least the step of reacting a compound of formula (VI) ##STR00002##
with a compound (VII) ##STR00003## wherein; R.sub.2 is hydrogen or a C1-C20 hydrocarbyl radical provided that at least one R.sub.2 is not hydrogen; R.sub.5 is hydrogen or a C1-20 hydrocarbyl group optionally containing one or more heteroatoms from groups 14-16; R.sub.6 is hydrogen or a C1-20 hydrocarbyl group optionally containing one or more heteroatoms from groups 14-16; n is 1, 2 or 3; each R.sub.8 is a C1-20 hydrocarbyl group; and Hal is a halide; in the presence of a nickel imidazolidin-2-ylidene compound.

A method of precipitating polymer and deactivated organometallic catalyst in an olefin oligomerization reaction is provided. The method includes providing an effluent stream from an olefin oligomerization reaction. The effluent stream can include a polymer and an organometallic catalyst. The method can further include introducing sorbent particles into the effluent stream. The sorbent particles can include a deactivating agent. The deactivating agent can be water, an alcohol, an amine, an amino alcohol, or a combination thereof. At least about 10% of the sorbent particles can have a particle size in a range from 10 m and 60 m. The method can further include cooling the effluent stream, thereby precipitating polymer and deactivated organometallic catalyst from the effluent stream to provide a precipitate that includes sorbent, polymer, and deactivated catalyst.

The present invention relates to a 1-octene composition. The 1-octene composition according to the present invention is prepared by ethylene oligomerization and comprises a high content of 1-octene and monomers useful for copolymerization of 1-octene at the same time.

A composition comprising: a) at least 76 mol % C.sub.10 monoolefins, the C.sub.10 monoolefins comprising i) at least 3 mol % 2-butyl-1-hexene, ii) at least 8 mol % 3-propyl-1-heptene, iii) at least 6 mol % 4-ethyl-1-octene, and iv) at least 20 mol % 5-methyl-1-nonene; and b) at least 1 mol % C.sub.14 monoolefins. A composition comprising at least 95 mol % C.sub.10 monoolefins, the C.sub.10 monoolefins comprising i) at least 3 mol % 2-butyl-1-hexene, ii) at least 10 mol % 3-propyl-1-heptene, iii) at least 7 mol % 4-ethyl-1-octene, and iv) at least 24 mol % 5-methyl-1-nonene. Processes to prepare a composition comprising at least 76 mol % C.sub.10 monoolefins and at least 1 mol % C.sub.14 monoolefins, or a composition comprising at least 95 mol % C.sub.10 monoolefins, where the C.sub.10 monoolefins comprise i) at least 3 mol % 2-butyl-1-hexene, ii) at least 10 mol % 3-propyl-1-heptene, iii) at least 7 mol % 4-ethyl-1-octene, and iv) at least 24 mol % 5-methyl-1-nonene.

The present invention relates to a catalyst system for olefin oligomerization and a method for olefin oligomerization, and more specifically, a catalyst system for olefin oligomerization and a method for olefin oligomerization that have more improved supporting efficiency due to a ligand compound capable of functioning as a tether to a support, and thus, exhibit high activity in the olefin oligomerization even with smaller amounts of catalyst composition and cocatalyst, thus enabling more efficient preparation of alpha-olefins.

N.sup.2-phosphinyl formamidine compounds and N.sup.2-phosphinyl formamidine metal salt complexes are described. Methods for making N.sup.2-phosphinyl formamidine compounds and N.sup.2-phosphinyl formamidine metal salt complexes are also disclosed. Catalyst systems utilizing the N.sup.2-phosphinyl formamidine metal salt complexes are also disclosed along with the use of the N.sup.2-phosphinyl amidine compounds and N.sup.2-phosphinyl amidinate metal salt complexes for the oligomerization and/or polymerization of olefins.