The present invention relates to a self assembled catalyst. More particularly, the present invention relates to a self-assembled catalyst of formula (I) comprising supramolecular phosphine and carboxylate ligands, process for preparation thereof and use of said catalyst of formula (I) in olefin polymerization.

A one-pot process for preparing a preformed catalytic system based on a rare-earth metallocene in a hydrocarbon solvent in three performed steps.

The present invention relates to methods for improving carbon capture using entrained catalytic-particles within an amine solvent. The particles are functionalized and appended with a CO.sub.2 hydration catalyst to enhance the kinetics of CO.sub.2 hydration and improve overall mass transfer of CO.sub.2 from an acid gas.

A carbonate-containing oligomer, a manufacturing method for a carbonate-containing oligomer and a crosslinked product are provided. The carbonate-containing oligomer includes a structure represented by formula (I), and formula (I) is defined as in the specification. The crosslinked product is obtained by mixing the carbonate-containing oligomer with a modified polyphenylene ether resin, and adding a peroxide to perform a curing reaction.

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 of producing polymer fibers and/or particles by direct polymerization of monomers without use of any external high energy sources (such as heat or UV) is described. The method may be used to fabricate polymer fibers, fiber mats, 3D polymer fiber structures, and polymer nano- and microparticles. Polymer fibers may be used to create fiber mats which can be utilized in a variety of applications.

A metal cyclopentadienyl complex has the formula: ##STR00001##
wherein m?0; M is a Group I, II or III main group metal, alkali or transition metal; C.sub.5H.sub.4 represents a Cp ring where two hydrogens are substituted by M and R(F).sub.m; R(F).sub.m is connected to any one of the carbon atoms of the Cp and selected from a hydrocarbyl, fluorohydrocarbyl, silyl group [SiR.sub.3], or amino group [NR.sup.1R.sup.2]. The metal cyclopentadienyl complexes include Li(C.sub.5H.sub.4-2-C.sub.5H.sub.11) (CAS No: 2413046-23-6), K(C.sub.5H.sub.4-2-C.sub.5H.sub.11), Na(C.sub.5H.sub.4-2-C.sub.5H.sub.11), K(C.sub.5H.sub.4-1-FC.sub.4H.sub.10), K(C.sub.5H.sub.4-1,1,1-3FC.sub.4H.sub.6), Li(C.sub.5H.sub.4-2-C.sub.4H.sub.9), or In(C.sub.5H.sub.4-2-C.sub.5H.sub.11) (CAS No.: 2364634-67-1). A mono-substituted cyclopentadiene has the formula: ##STR00002##
wherein m?0; C.sub.5H.sub.5 represents the Cp ring where one hydrogen is substituted R(F).sub.m; R(F).sub.m is connected to any one of the carbon atoms of the Cp and selected from a hydrocarbyl, fluorohydrocarbyl, silyl group [SiR.sub.3], or amino group [NR.sup.1R.sup.2]. The mono-substituted cyclopentadienes include C.sub.5H.sub.5-1-FC.sub.4H.sub.10, C.sub.5H.sub.5-2-C.sub.5H.sub.11, C.sub.5H.sub.5-2-C.sub.4H.sub.9, or C.sub.5H.sub.5-1,1,1-3FC.sub.4H.sub.6.

A carbon dioxide absorption and reduction solution contains 0.01 to 100 mM of a metal complex in a mixed solvent of water and a water-soluble solvent. The metal complex contains: a central metal which is any of rhenium, manganese, or iron; and a ligand which coordinates to the central metal. The ligand includes two or more carbonyl groups and two or more nitrogen-containing heterocycles, and at least one of the two or more nitrogen-containing heterocycles has at least one substituent including a carboxy group or a hydroxy group. When the central metal of the metal complex is ruthenium, the nitrogen-containing heterocycles May not have a carboxy group or a hydroxy group.

The invention provides methods useful in the industrial scale process for hydrocyanation of butadiene to adiponitrile for recycle of unwanted byproduct 2-methyl-3-butenenitrile (2M3BN) by conversion to process intermediate pentenenitrile. The invention provides a process for generating catalysts useful for carrying out the hydrocyanation of butadiene to adiponitrile, the process comprising contacting the 2M3BN and a solution of a nickel-ligand catalyst in cis-2-pentenenitrile (cis-2PN), trans-2-pentenenitrile (trans-2PN), or a mixture thereof. The improved methods of the invention can provide improved catalyst solubility for bidentate ligands without a requirement for a Lewis acid catalyst promoter such as zinc chloride to be present.

In the hydrocyanation reaction of butadiene proceeding through pentenenitriles to adiponitrile, catalysis by complexes of zerovalent nickel with bidentate phosphorus-based ligands of the NiL.sub.2A type wherein L.sub.2 is a bidentate ligand and A is an unsaturated compound, can be rate-limited by the solubility of the catalytic complex. The present invention concerns solvent compositions for the nickel-ligand complex comprising mixtures of unsaturated nitriles that provide for increased metal solubility, particularly in the absence of a Lewis acid promoter, resulting in higher hydrocyanation reaction rates in an industrial-scale process for production of important nylon manufacturing intermediates. The mixed nitrile solvent compositions can include mixtures of pentenenitriles and/or methylbutenenitriles. The mixtures of mixed unsaturated nitriles can be, at least in part, from recycle streams from the hydrocyanation reaction for which the nickel-bidentate ligand complexes are used as catalysts.