摘要:
The present invention is certain mono-ligated palladium catalysts that are easy to synthesize and are effective in Suzuki coupling reactions. These catalysts are characterized by an aromatic ring with a substituent group having an oxygen atom adjacent the aromatic ring and either an oxygen or nitrogen atom associated with the palladium atom.
摘要:
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 μm and 60 μm. 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.
摘要:
The present disclosure provides methods to produce para-xylene , toluene, and other compounds from renewable sources (e.g., cellulose, hemicellulose, starch, sugar) and ethylene in the presence of a catalyst. For example, cellulose and/or hemicellulose may be converted into 2,5-dimethylfuran (DMF), which may be converted into para-xylene by cycloaddition of ethylene to DMF. Para-xylene can then be oxidized to form terephthalic acid.
摘要:
Transition metal compound comprising at least one ligand system L with a nitrogen-phosphorus-nitrogen-structural element wherein phosphorus is pentavalent, catalyst system for the oligomerization of olefins comprising such a transition metal complex and process for oligomerization of olefinic monomers carried out in the presence of the catalyst system.
摘要:
The invention relaters to a process for producing an oligomeric product by oligomerisation of at least one olefinic compound, the process including a) providing an activated oligomerisation catalyst by combining, in any order, ι) a source of chromium, ιι) a ligating compound of the formula I (R 1 ) m X 1 (Y) X 2 (R 2 ) n ......I wherein X 1 and X 2 are independently an atom selected from the group consisting of nitrogen, phosphorus, arsenic, antimony, bismuth, oxygen, sulphur and selenium or said atom oxidized by S, Se, N or O where the valence of X 1 and/or X 2 allows for such oxidation, Y is a linking group between X 1 and X 2 , m and n are independently 0, 1 or a larger integer, and R 1 and R 2 are independently hydrogen, a hydrocarbyl group, an organoheteryl group or a heterohydrocarbyl group, and R1 being the same or different when m>1, and R 2 being the same or different when n>1, iii) a catalyst activator or combination of catalyst activators, b) providing a zinc compound, and c) contacting the at least one olefinic compound with a composition containing the activated oligomerisation catalyst and the zinc compound, the zinc compound being present in a sufficient quantity such that the ratio of the molar amount of zinc in the zinc compound to the molar amount of chromium in the source of chromium is between 1 and 10000 The invention also provides for a process for activating an oligomerisation catalyst to be used to produce an oligomeric product from at least one olefinic compound, as described above
摘要:
La présente invention concerne un procédé de tranformation de l'éthylène en propylène, dans lequel on fait réagir l'éthylène avec un composé métallique supporté comprenant un support à base d'oxyde d'aluminium sur lequel est greffé un hydrure de tungstène. La réaction peut être conduite entre 20 et 600 °C, de préférence entre 50 et 350 °C, sous une pression absolue comprise entre 0,01 et 8 MPa, de préférence 0,01 et 1 MPa. Le catalyseur peut être régénéré par admission d'hydrogène, à une température comprise entre 50 et 300 °C.
摘要:
The invention pertains to a process for making a linear alpha-olefin oligomer in a reactor comprising a liquid and a gas phase, comprising the steps of catalytically oligomerizing ethylene in the presence of an iron complex of ,a 2,6-bis (arylimino)pyridine derivative, to the alpha-olefin oligomer with an average molecular weight between 50 and 350 under release of heat, and removing the heat with a heat exchanger, which is not in direct contact with the liquid phase, using at least part of the gas phase as a coolant medium. The invention further relates to an apparatus to perform said process.
摘要:
The present invention relates to a supported metal compound comprising a solid support to which are grafted at least two types of metal atom, Me, one in a form (A) of a metal compound where the metal atom is bonded to at least one hydrogen atom and/or to at least one hydrocarbon, and the other in a form (B) of a metal compound where the metal atom is bonded solely to the support and optionally to at least one other element which is neither a hydrogen atom nor a hydrocarbon radical. The compound can be prepared (a) by grafting an organometallic precursor (P) comprising the metal Me, bonded to at least one hydrocarbon ligand, to the solid support, and (b) by treating the solid product resulting from step (a) with hydrogen or a reducing agent, at a temperature greater than the temperature, TI, at which the supported metal compound is formed solely in the form (A), and at a temperature lower than the temperature, T2, at which the supported metal compound is formed solely in the form (B). The compound can be used in particular as a catalyst in a process employing hydrocarbon splitting and recombination reactions, e.g. in a hydrocarbon metathesis reaction, with a greatly increased catalytic activity, in comparison with a supported metal compound which is identical but which would include only the form (A), the form (B) being inactive in this type of reaction.
摘要:
The 177 DEG -343 DEG C (350 DEG -650 DEG F) portion of the product from the oligomerization of light olefins with surface-deactivated shape selective medium pore zeolite catalyst comprises olefinic hydrocarbons having unique and desirable structures as precursors for high cetane value clean fuels. These oligomers are near linear in structure and contain no aromatics. Following hydrogenation they produce cetane values between 50 and 75. When the near linear olefinic hydrocarbons from surface-deactivated zeolite catalyzed oligomerization of light olefins are subjected to ethene metathesis to alpha olefins and oligomerization, the overall process reaction product comprises a mixture of a 343 DEG C + (650 DEG F +) portion comprising high VI lubricant and a 177 DEG -343 DEG C (350 DEG -650 DEG F) portion comprising high cetane clean fuels precursor. Hydrogenation of the 177 DEG -343 DEG C (350 DEG -650 DEG F) portion provides an aromatics-free fuel with a cetane value between 50-70 containing less that 0.5 weight % naphthenes.
摘要:
C3 and higher olefins are oligomerized using a two component catalyst system comprising (a) a soluble adduct of zirconium tetrahalide, the halogen being Br or Cl, with an organic compound selected from the group of esters, ketones, ethers, amines, nitriles, anhydrides, acid chlorides, amides or aldehydes, the organic compound having up to about 30 carbon atoms and (b) an alkyl metal selected from the group R2AlX, RAlX2, R3Al2X3, R3Al and R2Zn where R is C1-C20 alkyl and X is Cl or Br. ZrCl4 adducts with organic acetates are the preferred embodiments. Dimers, trimers and tetramers are selectively prepared in the process.