58 results about "Olefin synthesis" patented technology

Improved processing for the production of light olefins is provided involving synthesis gas conversion to form an effluent including product dimethyl ether, subsequent separation of the product dimethyl ether and conversion thereof to the desired light olefins. The synthesis gas conversion effluent may also desirably include methanol and at least a portion of such methanol may be employed to effect the separation of the product dimethyl ether.

The invention belongs to the technical field of development and manufacture of petrochemical products and in particular relates to universal type synthetic gasoline-diesel lubrication oil and a preparation method thereof. The lubrication oil comprises the following raw materials in parts by weight: 0.01-30 parts of synthetic ester base oil, 0.01-90 parts of mineral oil, 0.01-90 parts of olefin synthesis oil PAO, 5.0-10.0 parts of a viscosity modifier, 3-10.0 parts of a clearing agent, 1.0-5.0 parts of a dispersing agent, 0.5-3.0 parts of an oxidation and corrosion inhibitor, 1.0-3.0 parts of a pour point depressant, 0.5-3.0 parts of FK303 and 0.0001-0.01 part of a defoaming agent. The preparation method of the lubrication oil comprises the following steps: step one, adding synthetic ester base oil, the mineral oil and the olefin synthesis oil PAO in a mixing kettle, and stirring at 80-90 DEG C for 1 hour; step two, adding the viscosity modifier into the mixing kettle in the step one, and continuing to stir at 80-90 DEG C for 3 hours; adding the clearing agent, the dispersing agent, the oxidation and corrosion inhibitor, the pour point depressant, FK303 and the defoaming agent into the mixing kettle and continuing to stir at 80-90 DEG C for 1-2 hours to obtain the lubrication oil. The universal type synthetic gasoline-diesel lubrication oil is mainly used in the application field of motor vehicle lubricating oil.

The average propylene selectivity per on-stream cycle of an alcoholic oxygenate to propylene (OTP) process using one or more fixed beds of a dual-function oxygenate conversion catalyst is substantially enhanced by the use of a feed pretreatment step involving a catalytic etherification reaction, by switching to moving bed reactor technology in the olefin synthesis portion of the OTP flow scheme in lieu of fixed bed technology and by the selection of a catalyst on-stream cycle time of 300 hours or less. These provisions hold the build-up of coke deposits on the dual-function catalyst to a level which does not substantially degrade catalyst activity, oxygenate conversion and propylene selectivity, thereby enabling maintenance of propylene average cycle yield at essentially start-of-cycle levels. The propylene average cycle yield improvement enabled by the present invention over that achieved by the fixed bed system of the prior art using the same or a similar dual-function catalyst system is of the order of about 1.5 to 5.5 wt-% or more.

A method is described for processing an olefin-containing product stream (1) that contains, besides ethylene and propylene, longer-chain olefins and compounds of hydrocarbons with oxygen (oxygenates). Such a product stream (I) can occur in particular in olefin synthesis from methanol. The product stream is dewatered in successive process steps, optionally compressed in several steps and dried. Then it is subjected to fractionation. For removal of the undesired oxygenates it is proposed that the oxygenates be washed out of the gaseous product stream after the compression steps and before the drying step in a column (12) with methanol.

The invention discloses a process method for production of alpha-olefin by oligomerization of selective ethylene; a high-pressure reaction kettle is externally connected with a material circulation pipeline; the material circulation pipeline is provided with a heat exchanger and a gas-liquid separator; in the synthesis process of alpha-olefin, ethylene is inputted to the high-pressure reaction kettle, alpha-olefin synthesized in the presence of a catalyst and a reaction solvent is dissolved in a solvent in the kettle, and a reaction liquid containing a product flows out from the bottom of thekettle, then has heat exchanged by the heat exchanger, enters the gas-liquid separator and is subjected to gas-liquid separation; gas discharged from the top of the gas-liquid separator flows back toa gas mixing tank, and a liquid is sent back to the high-pressure reaction kettle. The invention also relates to a system implementing the process. Heat generated from the reaction is removed in time,the reaction temperature is steadily controlled, and the activity and the selectivity of the catalyst are improved.

The invention provides a process for preparing light olefin from coal-based synthesis gas and co-producing low-carbon mixed aldehyde. The process comprises the following steps: carrying out contact reaction on a coal-based synthesis gas and a catalyst for light olefin synthesis, then carrying out contact reaction on a tail gas and a hydroformylation catalyst and synthesizing to obtain mixed propionaldehyde and butyraldehyde. The synthesis gas contained in the reaction product tail gas obtained in the preparation of light olefin from the coal-based synthesis gas in the process for preparing light olefin from coal-based synthesis gas and co-producing low-carbon aldehyde, which is provided by the invention, and light olefin almost just meet the raw material ratio required in preparation of aldehyde by hydroformylation, so that the resources can be fully utilized and the flow can be simplified. By the process provided by the invention, the co-production of light olefin and low-carbon mixed aldehyde can be well achieved.

The invention relates to hydrogen absorption fiber paste for an optical fiber composite overhead ground wire (OPGW) optical cable. The hydrogen absorption fiber paste comprises, by weight, 75-85% of base oil, 6-10% of gelatinizing agent, 0.3-0.6% of antioxidant, 0.8-1% of viscosity index improver, 1.5-2% of oil distribution inhibitor and 2-5% of hydrogen absorption agent. The base oil is polyalpha-olefin synthesis oil, and the gelatinizing agent is a composite of an organic gelatinizing agent and an inorganic gelatinizing agent. The hydrogen absorption fiber paste has the advantages of adopting the polyalpha-olefin synthesis oil as the base oil so as to enable the fiber paste to have good high-low-temperature performance; improving the stability of a glue body by adding an appropriate amount of silicon-containing (inorganic) glue body into a silicon-free (organic) glue body; having good hydrogen absorption performance by adding an efficient hydrogen absorption agent, removing hydrogen caused by incompatibility of the fiber paste and stainless steel and caused in welding process, reducing defects in optical fiber lattice and loss of optical fiber, and improving transmission performance of the optical fiber.

Disclosed is a method for the combined synthesis of at least two vinylic monomers, at least one of which being an acrylic compound, comprising subjecting a monoconjugated alkene-1-carboxylic compound to reaction with a C₂-C₄ alkene under conditions of olefin cross-metathesis. The invention is particularly useful for extracting value from protein side streams. Upon protein hydrolysis, suitable amino acids (preferably phenylalanine or tyrosine) are subjected to reductive amination so as to form the corresponding alkene-1-carboxylic acid. Preferably after esterification and separation, this is used in cross-metathesis for the concomitant production of styrene resp. hydroxy styrene, and acrylates. The invention is applicable more widely, to the synthesis of olefins on the basis of carbohydrates, naturally occurring phenolic components, natural protein resources, or amino acids obtained from fermentations.

Disclosed is a method for production of lower olefins from a raw material containing dimethyl ether (DME), which can produce lower olefins (e.g. propylene) with good yield and in an economically advantageous manner by prolonging the time until the reversible deactivation of a zeolite catalyst and preventing the irreversible deactivation of the catalyst, can reduce the amount of water to be recycled to increase the thermal efficiency of the process, and can simplify the facilities and operations. Also disclosed is a method for improving the yield of propylene with good efficiency under practical operating conditions. A feed gas which comprises a DME-containing feedstock gas and an additive gas and further contains steam at a specific proportion is introduced into an olefin synthesis reactor to contact the feed gas with a zeolite catalyst, thereby producing a hydrocarbon product containing C2-C5 olefins. Propylene or the like is separated/collected from the hydrocarbon product, and at least a part of the remainder is used as at least a part of the additive gas.

The invention discloses a photochemical process for olefin synthesis of oxygen-containing compound which comprises, inducing olefin with ultraviolet light / visible light, oxygenizing in water or the mixed medium of organic / water. The olefin includes alkenylene, annular olefin, aromatic hydrocarbon and substituted alkenylene, substituted annular olefin, or substituted aromatic hydrocarbon.

The present invention relates to an integrated process to convert crude oil into petrochemical products comprising crude oil distillation, dearomatization, ring opening, and olefins synthesis, which process comprises subjecting a hydrocarbon feed to dearomatization to produce a first stream enriched in aromatic hydrocarbons and naphthenic hydrocarbons and a second stream enriched in alkanes; subjecting a stream enriched in aromatic hydrocarbons and naphthenic hydrocarbons to ring opening to produce alkanes; and subjecting refinery unit-derived alkanes produced in the process to olefins synthesis. Furthermore, the present invention relates to a process installation to convert crude oil into petrochemical products comprising a crude distillation unit comprising an inlet for crude oil and at least one outlet for one or more of naphtha, kerosene and gasoil; a dearomatization unit comprising an inlet for a hydrocarbon feed to dearomatization, an outlet for a stream enriched in aromatic hydrocarbons and naphthenic hydrocarbons and a second stream enriched in alkanes; a ring opening unit comprising an inlet for aromatics and naphthenes produced by dearomatization and an outlet for alkanes; a unit for olefins synthesis comprising an inlet for alkanes and an outlet for olefins. The hydrocarbon feed subjected to dearomatization comprises one or more of naphtha, kerosene and gasoil produced by crude oil distillation in the process; and refinery unit-derived light-distillate and/or refinery unit-derived middle-distillate produced in the process. The process and the process installation of the present invention have an increased production of petrochemicals at the expense of the production of fuels and an improved ethylene yield.

The invention discloses a palladium catalyst for catalyzing quinazolinone synthesis and olefination reaction, and belongs to the technical field of catalysts. A novel homogeneous palladium catalyst is prepared by combining a specific nitrogen-containing ligand with transition metal palladium, and a heterogeneous catalyst can be obtained by combining the homogeneous palladium catalyst with mesoporous silica. The obtained homogeneous or heterogeneous palladium catalyst is used for catalyzing quinazolinone cascade reaction and olefin synthesis reaction of alcohol and aryl sulfone, has excellent catalytic activity, and is more environment-friendly than a traditional catalyst.