138 results about "Linear alpha olefin" patented technology

Linear 1-butene dimers and other linear alpha-olefin dimers are manufactured in high yield and with high selectivity by coupling of alpha-olefins. The coupling is accomplished by contacting alpha olefins with an iron-based catalyst activated with an aluminum-based co-catalyst. The catalyst is structured to preclude formation of multiple dimer products, and the byproducts of the olefin coupling consist almost exclusively of methyl branched olefin dimers. The dimers have potentially diverse use in areas stretching form pharmaceuticals to plastics. Linear 1-butene dimers may be particularly useful in the production of plasticizer alcohols which may in turn be used to manufacture high quality plastics with reduced leaching.

A process for the preparation of low molecular weight linear alpha olefins is disclosed. The process comprises oligomerising ethylene in an inert aliphatic or aromatic solvent in the presence of a catalyst comprising of a first component selected from zirconium alkoxide and zirconium aryloxide and a second component selected from alkyl aluminum halide and/or alkyl aluminum.

A novel liquid phase polymerization process for preparing a polyolefin product having preselected properties is disclosed. The process includes the steps of providing a liquid feedstock which contains an olefinic component and a catalyst composition consisting of a stable complex of BF₃ and a complexing agent therefor. The feedstock may comprise any one or more of a number of olefins including branched olefins such as isobutylene, C₃ to C₁₅ linear alpha olefins and C₄ to C₁₅ reactive non-alpha olefins. The feedstock and the catalyst composition are introduced into a residual reaction mixture recirculating in a loop reactor reaction zone provided in the tube side of a shell and tube heat exchanger at a recirculation rate sufficient to cause intimate intermixing of the residual reaction mixture, the added feedstock and the added catalyst composition. The heat of the polymerization reaction is removed from the recirculating intimately intermixed reaction admixture at a rate calculated to provide a substantially constant reaction temperature therein while the same is recirculating in said reaction zone. The conditions in the reactor are appropriate for causing olefinic components introduced in said feedstock to undergo polymerization to form the desired polyolefin product in the presence of the catalyst composition. A product stream containing the desired polyolefin product is withdrawn from the reaction zone. The introduction of the feedstock into the reaction zone and the withdrawal of the product stream from the reaction zone are controlled such that the residence time of the olefinic components undergoing polymerization in the reaction zone is appropriate for production of the desired polyolefin product.

A wellbore fluid having an oleaginous phase and an additive for increasing the density of the wellbore fluid. The additive comprises solid colloidal particles coated with a dispersant coated onto the colloidal particle during the comminution process of forming the particles. Exemplary starting materials for the colloidal particles include commonly known weighting agents including barite, calcium carbonate, dolomite, ilmenite, hematite or other iron ores, olivine, siderite, and strontium sulfate as well as mixture and combinations of these and other similar weighting materials. The dispersant in one illustrative embodiment, is selected from carboxylic acids of molecular weight of at least 150 Daltons. Alternatively, the dispersant coating may be made of compounds including oleic acid, polybasic fatty acids, alkylbenzene sulfonic acids, alkane sulfonic acids, linear alpha-olefin sulfonic acid or the alkaline earth metal salts of any of the above acids, and phospholipids as well as mixtures and combinations of these compounds. In another illustrative embodiment the dispersant is a polyacrylate ester. The illustrative polymeric dispersant should have an average molecular weight from about 10,000 Daltons to about 200,000 Daltons.

The invention discloses a method for preparing linear alpha-olefin. The method comprises the following steps of: introducing catalytic solution and ethylene into a first reactor and reacting at the temperature of between 30 and 120 DEG C and under the pressure of 0.1 to 3 MPa for 1 to 40 min to prepare a first mixed material flow of first linear alpha-olefin, the ethylene and the catalytic solution; introducing the first mixed material flow and the ethylene into a second reactor and reacting at the temperature of between 40 and 90 DEG C and under the pressure of 0.5 to 4 MPa for 5 to 120 min to prepare a second mixed material flow of second linear alpha-olefin, the ethylene and the catalytic solution; performing gas-liquid separation on the second mixed material flow to obtain the ethylene and a liquid-phase product; cycling the separated ethylene to the first reactor or the second reactor for continuous reaction; and performing distillation separation on the liquid-phase product to prepare the linear alpha-olefin. The method has the advantages of mild reaction condition, simple operation and suitability for industrialized production.

The invention provides a catalyst system for ethylene selective oligomerization and belongs to the field of catalytic technologies. The catalyst system comprises three components which are a ligand a,a transition metal compound b, and an activator c, wherein the transition metal compound b is a metal compound of groups IVB to VIII; the activator c is a compound containing group IIIA metal; the ligand a contains at least one phosphine amine group as shown in the following general formula I, the bridging group A is the bridging group of which the main chain contains alkyl, alkenyl or aryl and aheteroatom, wherein the heteroatom is one of silicon, tin, boron, phosphorus, nitrogen, oxygen or sulfur; R<1>, R<2> and R<3> are substituent groups on two phosphine groups respectively, and R<1>, R<2> and R<3> are the same or different. The catalyst system for the ethylene selective oligomerization, disclosed by the invention, has the beneficial effects that the catalyst system is high in activity, target products of 1-hexene and 1-1octene are high in selectivity, and the content of linear alpha-olefin of C6-C8 in the products is greater than 90% in percentage by mass and a catalyst is simple in synthesis, low in cost and long in service life.

Non-symmetrical ligands of formula (I);

bis-aryliminepyridine MX_n complexes comprising a non-symmetrical ligand of formula (I), wherein M is a metal selected from Fe or Co, n is 2 or 3, and X is halide, optionally substituted hydrocarbyl, alkoxide, amide, or hydride; [bis-aryliminepyridine MY_p.L_n⁺][NC⁻]_q complexes, comprising a non-symmetrical ligand of formula (I), wherein Y is a ligand which may insert an olefin, M is Fe or Co, NC⁻ is a non-coordinating anion and p+q is 2 or 3, matching the formal oxidation of the metal atom M, L is a neutral Lewis donor molecule and n=0, 1, or 2; and processes for the production of alpha-olefins from ethylene, using said complexes.

Linear alpha olefins having from four to twenty carbon atoms and low amounts of oxygenates are synthesized, by producing a synthesis gas containing H2 and CO from natural gas and passing it over a non-shifting cobalt catalyst at reaction conditions of temperature, % CO conversion, and gas feed H2:CO mole ratio and water vapor pressure, effective for the mathematical expression 200-0.6T+0.03PH2O-0.6XCO-8(H2:CO) to have a numerical value greater than or equal to 50. This process can be integrated into a conventional Fischer-Tropsch hydrocarbon synthesis process producing fuels and lubricant oils.

A process for the production of alpha-olefins comprising reacting ethylene under oligomerization conditions in the presence of a mixture comprising: (a) a metal salt based on Fe(II), Fe(III), Co(II) or Co(III); (b) a pyridine bis-imine ligand; and (c) a co-catalyst which is the reaction product of water with one or more organometallic aluminium compounds, wherein the one or more organometallic aluminium compounds is selected from: (i) βδ-branched compounds of formula (I):

Al(CH₂—CR¹R²—CH₂—CR⁴R⁵R⁶)_xR³_yH_z;

(ii) βγ-branched compounds of formula (II)

Al(CH₂—CR¹R²—CR⁴R⁵R⁶)_xR³_yH_z

and mixtures thereof; wherein when the metal salt and the bis-arylimine pyridine ligand are mixed together they are soluble in aliphatic or aromatic hydrocarbon solvent.

The invention relates to a method for preparing octylene-1 by ethylene tetramerization reaction. The catalyst is composed of components (a), (b), (c) and/or (d) in a mol ratio of 1:(0.5-100):(0.1-5000):(0-500), wherein the component (a) is 1,2-bis(N(P(phenyl2)2)-benzene, 1,4-bis(N(P(phenyl)2)2)-benzene or N(CH2CH2N(P(phenyl)2)2)3; the component (b) is CrCl3(THF)3, chromium isooctoate or chromium acetylacetone; the component (c) is the product of reacting an alkyl aluminum compound or aluminoxane compound with a modifier containing at least two heteroatoms; and the component (d) is ortho-trichloromethylfluorobenzene, ortho-trifluoromethylchlorobenzene, ortho-trichloromethylchlorobenzene, ortho-trifluoromethylchlorobenzene, or 2 or 6-dichloro-trichloromethylbenzene. The mass percentage of the C8 linear alpha-olefin in the product is greater than 60%.

This invention relates to a hydroxyaromatic functionalized polyalpha-olefin comprising the product of the combination of:

• • a) a polyalpha-olefin comprising one or more C3 to C20 linear alpha-olefins and having at least 10% vinylidene unsaturation, a viscosity index of 80 to 400, an Mn of 300 to about 20,000, and a pour point of 0° C. or less; and
  • b) a hydroxyaromatic moiety;

wherein the analine point of the functionalized polyalpha-olefin is at least 10° C. lower than the analine point of the polyalpha-olefin.

Mixed bis-imine pyridine ligands of formula (I), wherein Z₁, which is different from Z₂, is an optionally substituted aryl group; and Z₂ comprises an optionally substituted heterohydrocarbyl moiety, or an optionally substituted aryl group in combination with a metal, said optionally substituted aryl group being π-co-ordinated to the metal;

mixed bis-imine pyridine complexes comprising a ligand of formula (I); mixed ionic bis-imine pyridine complexes comprising a ligand of formula (I); and processes for the production of alpha olefins from ethylene, using said complexes.

The invention discloses a solvent phase Fischer-Tropsch synthesis method. The method is characterized in that a Fischer-Tropsch synthesis reaction is carried out in a heterogeneous reaction system; a polar solvent is taken as the reaction medium; a traditional granular Fischer-Tropsch synthesis catalyst is suspended or soaked in the polar solvent phase to carry out the Fischer-Tropsch synthesis reaction; and as the generated hydrocarbon products are insoluble in the polar solvent, the phases are voluntarily split. The method can be used for producing linear alpha-olefins (LAOs) with various carbon numbers. By applying the method, the reaction products can rapidly leave the inner and outer surfaces of the catalyst to reduce the probability of readsorption and secondary reaction, thus improving the yield of the LAOs. The Fischer-Tropsch synthesis reaction can be carried out in the conventional Fischer-Tropsch synthesis reactor by using the common catalyst. By applying the method, the mass content of the LAOs in the reaction products is more than 70%, thus being very beneficial to separation and purification. Meanwhile, by applying the method, the CO conversion rate can be improved, the methane selectivity can be reduced and the yield of heavy hydrocarbons can be greatly increased.

Oils from plants and animal fats are hydrolyzed to fatty acids for a Kolbe reaction. The invention relates to a high productivity Kolbe reaction process for electrochemically decarboxylating C4-C28 fatty acids using small amounts of acetic acid to lower anodic passivation voltage and synthesizing C6-C54 hydrocarbons. The C6-C54 undergo olefin metathesis and/or hydroisomerization reaction process to synthesize heavy fuel oil, diesel fuel, kerosene fuel, lubricant base oil, and linear alpha olefin products useful as precursors for polymers, detergents, and other fine chemicals.

Environmentally acceptable or regulatory compliant oil-based drilling fluids and methods of using same in drilling a wellbore in a subterranean formation are disclosed. The fluids are able to meet environmental regulations while maintaining acceptable oil mud rheology and overall oil mud performance. The fluids are comprised of an invert emulsion. The base or continuous phase of the emulsion is comprised of esters blended with isomerized olefins, and/or other hydrocarbons, such as paraffins, mineral oils or glyceride triesters or combinations thereof. Alternatively, the emulsion has as a base comprising isomerized olefins blended with other hydrocarbons such as linear alpha olefins, paraffins or naphthenes.

This invention relates to a catalyst compound comprising a combination of a cyclic alkyl amino carbene ligand and a benzylidene both attached to a Group 8 metal, preferably ruthenium atom.

This invention also relates to a process to make linear alpha-olefins comprising contacting a feed material and an optional alkene (such as ethylene) with the catalyst described above, wherein the feed material is a triacylglyceride, fatty acid, fatty acid alkyl ester, and/or fatty acid ester, typically derived from seed oil (e.g., biodiesel).

This invention relates to a catalyst compound comprising a combination of a cyclic alkyl amino carbene ligand and a benzylidene both attached to a Group 8 metal, preferably ruthenium atom.

This invention also relates to a process to make linear alpha-olefins comprising contacting a feed material and an optional alkene (such as ethylene) with the catalyst described above, wherein the feed material is a triacylglyceride, fatty acid, fatty acid alkyl ester, and/or fatty acid ester, typically derived from seed oil (e.g., biodiesel).

The invention is directed to a process for the preparation of lubricant base stocks by contacting alphaolefin feedstocks with single-site metallocene catalysts and recycling unconverted monomers, characterized by a purge step in the recycle.

The present invention relates to a method for oligomerization of ethylene, comprising the steps:

• • a) feeding ethylene, solvent and a catalyst composition comprising catalyst and cocatalyst into a reactor,
  • b) oligomerizing ethylene in the reactor,
  • c) discharging a reactor effluent comprising linear alpha-olefins including 1-butene, solvent, unconsumed ethylene dissolved in the reactor effluent, and catalyst composition from the reactor,
  • d) separating ethylene and 1-butene collectively from the remaining reactor effluent, and
  • e) recycling at least a part of the ethylene and the 1-butene separated in step d) into the reactor.

The invention discloses a method for enhancing yield of linear alpha-olefins. The method comprises the following steps: introducing hydrogen into a catalytic-reaction-medium-containing oligomerization reactor as an activator, controlling at appropriate reaction temperature, introducing a vinyl monomer, keeping the reaction pressure, and carrying out oligomerization to prepare the high-grade linear alpha-olefins. The oligomerization reactor is selected from one or more of stirred tank reactors or tubular reactors, and can adopt series or parallel operation of single or multiple reactors. The hydrogen is added one or more of one-step addition, batch addition or sectionalized addition mode. The catalytic reaction medium is composed of a main catalyst, a cocatalyst and an organic solvent, wherein the main catalyst is selected from late-transition iron catalysts. The method is simple and feasible, is easy to implement, and can obviously enhance the yield of linear alpha-olefins, thereby greatly lowering the cocatalyst consumption of the unit product, and being beneficial to lowering the production cost and enhancing the economic benefits.

The invention provides an ethylene oligomerization catalyst composition. The ethylene oligomerization catalyst composition comprises a main catalyst of a 1, 10-phenanthroline amino-iron (II) complex which is substituted by propionyl in a formula (I) and a catalyst promoter of triethyl aluminum, wherein the molar ratio of the metallic aluminium of the catalyst promoter to the central metallic aluminium of the main catalyst is between 30 and 900. According to the ethylene oligomerization catalyst composition, the triethyl aluminum which is used as the catalyst promoter is low in price and only accounts for a small percentage of the price of methylaluminoxane, and the usage of the catalyst promoter is greatly reduced, the catalyst has good catalytic activity of catalyzing ethylene oligomerization, so that the ethylene oligomerization reaction cost is greatly lowered; the selectivity of linear alpha-olefin in an oligomerization product is high; the oligomerization product is distributed reasonably; polyvinyl cannot be generated; and thus, the ethylene oligomerization catalyst composition has a wide industrial prospect.