A method for preparing a homogenous catalyst for use in preparing a linear alpha olefin includes: preparing a first pre-catalyst solution by mixing a chromium source and a ligand in a first solvent, wherein the first pre-catalyst solution is stored in a first vessel; preparing a second pre-catalyst solution by mixing an organoaluminum compound and a modifier in a second solvent, wherein the second pre-catalyst solution is stored in a second vessel; and simultaneously feeding the first pre-catalyst solution and the second pre-catalyst solution directly into a reaction vessel, wherein the reaction vessel includes a third solvent.

The invention relates to the field of oligomerization of olefins to produce linear -olefins, in particular hexene-1, with the use of a catalyst system. The catalyst system comprises a chromium source compound, a nitrogen-containing ligand, alkylaluminum, and a zinc compound, wherein catalyst system is activated during its preparation by 1) heating some and SHF irradiation (microwave irradiation) of alkylaluminum or a mixture of the alkylaluminum and the zinc compound, or by 2) heating alkylaluminum or a mixture of the alkylaluminum and the zinc compound, followed by holding (aging) the prepared catalyst system for a certain period of time.

Disclosed are processes, systems, and reaction systems for the oligomerization of ethylene to form an ethylene oligomer product in a reaction zone using a catalyst system comprising (a) a chromium component comprising an N.sup.2-phosphinyl amidine chromium compound complex, an N.sup.2-phosphinyl formamidine chromium compound complex, an N.sup.2-phosphinyl guanidine chromium compound complex, or any combination thereof, and (b) an aluminoxane. A C.sub.3+ olefin can be present in the reaction zone for a period of time, where the C.sub.3+ olefin is not an ethylene oligomer formed in-situ within the reaction zone.

This invention relates to a self cleaning reactor and to a process for the oligomerization of ethylene that employs a self-cleaning reactor. The reactor includes a mass of inert, particulate cleaning bodies that are entrained by the liquid in the reactor and scour the internal surfaces of the reactor during normal operation. This scouring action reduces the level of fouling on the reactor surfaces. Foulant material (polyethylene) is removed from the process on a continuous basis but the cleaning bodies remain within the reactor.

Disclosed are a novel catalyst system which is a catalyst system for selectively oligomerizing olefin including ethylene and may trimerize and tetramerize olefin, different from the catalyst system for olefin oligomerization reported until now, and a method for preparing an olefin oligomer using same. The present invention provides catalyst system for olefin oligomerization, including ligand compound represented by Formula 1 or 2; a chromium compound; and a metal alkyl compound, and a method for preparing an olefin oligomer using same.

Disclosed are processes, systems, and reaction systems for the oligomerization of ethylene to form an ethylene oligomer product in a reaction zone using a catalyst system comprising (a) a chromium component comprising an N.sup.2-phosphinyl amidine chromium compound complex, an N.sup.2-phosphinyl formamidine chromium compound complex, an N.sup.2-phosphinyl guanidine chromium compound complex, or any combination thereof, and (b) an aluminoxane. A C.sub.3+ olefin can be present in the reaction zone for a period of time, where the C.sub.3+ olefin is not an ethylene oligomer formed in-situ within the reaction zone.

The present invention relates to a method of preparing -olefins by oligomerization of C.sub.2-C.sub.4 olefins. The method is carried out by oligomerization of C.sub.2-C.sub.4 olefins in the presence of a catalyst system comprising a transition metal source, an activator, which is an alkylaluminoxane, and a compound of formula (I), Ar.sup.1Ar.sup.2PN(R)PAr.sup.3Ar.sup.4 [formula I], wherein Ar.sup.1-4 are the same or different and are selected from substituted or unsubstituted C.sub.6-C.sub.10 aryl, R is selected from linear or branched C.sub.1-C.sub.4 alkyl, substituted or unsubstituted C.sub.6-C.sub.10 aryl, and substituted or unsubstituted C.sub.3-C.sub.10 cycloalkyl, wherein the oligomerization is carried out in a solvent, which is a bicyclic compound or a mixture of bicyclic compounds, preferably decalin. The claimed method provides a significant increase in the activity of the catalyst during the oligomerization process and, as a consequence, a reduction in the catalyst unit consumption, as well a reduction in the formation of polymer by-product.

A method for processing an oligomerization product stream includes discharging the oligomerization product stream from an oligomerization reactor through a product outlet line, and heating the oligomerization product stream, heating a wall of the product outlet line, or both. The oligomerization product stream includes solvent, linear alpha olefins, a polymer byproduct, or a combination of at least one of the foregoing. The heating is to a temperature that is greater than the melting temperature of the polymer byproduct present in the oligomerization product stream.

The disclosure relates to a process for obtaining alpha-olefins by heterogeneous catalytic ethenolysis of optionally-functionalized unsaturated, in particular mono-unsaturated, olefins. The disclosure also relates to new supported catalysts that can be used in the process and to a method for preparing the supported catalysts.

A composition is described which comprises at least one chromium compound, at least one aryloxy compound of an element M selected from the group formed by magnesium, calcium, strontium and barium, with general formula [M(RO).sub.2-nX.sub.n].sub.y, in which RO is an aryloxy radical of a derivative ROH containing 6 to 80 carbon atoms, X is a halogen or a hydrocarbyl radical containing 1 to 30 carbon atoms, n is a whole number which may take the values 0 or 1 and y is a whole number in the range 1 to 10, and at least one additive selected from ether type compounds, which may or may not be cyclic, introduced in a near-stoichiometric quantity with respect to the element M.