226results about "Hydrocarbon purification/separation" patented technology

The invention discloses an ether polymerization inhibitor special for a butadiene extraction system and a preparation method of the ether polymerization inhibitor. The ether polymerization inhibitor comprises the following raw materials: a polymerization inhibitor intermediate, a solvent and a dispersing agent, the production process comprises the following steps: preparing a polymerization inhibitor intermediate, preparing a solvent, compounding, feeding and mixing, filtering, removing impurities and detecting. According to the method, firstly, a polymerization inhibitor 701 and diethylene glycol normal pressure etherification process is adopted, and beta-hydroxyethyl methyl ether is introduced to seal a terminal group, so that the power consumption is reduced, the generation of byproducts is inhibited, the solubility of an intermediate acetonitrile is improved to be greater than or equal to 30g / L, and the anti-interference performance is greatly enhanced; the solvent doped with a small amount of silane modified nano diatomite is prepared, impurities can be adsorbed, metal ions can be chelated, the dispersing agent can be assisted to be evenly distributed, the problems that a pure water solvent is single in function and the dispersing agent is prone to agglomeration are solved, and the polymerization inhibition efficiency and the stability of an extraction system are guaranteed.

To provide a process for producing renewable linear alkylbenzenes from vegetable, animal, nut and / or seed oils, which are biorenewable resources.SOLUTION: The process includes: a linear selective cracking process to crack C14+ chains into C9 to C14 chains which are useful for producing linear alkylbenzene for use in detergents; and a hydroisomerization step to produce paraffins with monomethyl branching which can be reacted with benzene to form monomethyl alkyl benzenes.SELECTED DRAWING: None

To provide a method for producing ethylene in high yield by selective hydrogenation of a gas mixture containing high-concentration acetylene generated by a methane pyrolysis process.SOLUTION: There is disclosed a process for converting methane into value-added compounds, wherein a gas mixture containing high-concentration acetylene as well as hydrogen formed through methane pyrolysis (for example, non-oxidative coupling of methane) is selectively hydrogenated in the presence of a bimetallic supported catalyst to obtain ethylene from acetylene in the gas mixture, while unreacted methane and hydrogen are recovered as byproducts and / or additionally recycled.SELECTED DRAWING: Figure 1

A method of selectively producing oligomers can include contacting at least one antifouling agent with a first amount of at least one aluminum alkyl compound to form at least one antifouling compound comprising the following structure or dimer form thereof: (I); and adding the at least one antifouling compound, an additional amount of the at least one aluminum alkyl compound, the at least one titanate compound, and ethylene to a jet loop reactor to oligomerize the ethylene to produce one or more of 1-butene, 1-hexene, or 1-octene. (I)

The invention discloses a pure silica zeolite DD3R hydrogenation catalyst as well as a preparation method and application thereof. The pure silica zeolite DD3R hydrogenation catalyst takes a DD3R molecular sieve as a carrier, and a Cu element and a Pd element are loaded on the carrier; in the pure silica zeolite DD3R hydrogenation catalyst, the mass ratio of the Pd element is 0.2 wt%-0.6 wt%, and the mass ratio of the Cu element is 0.2 wt%-0.7 wt%. The preparation method comprises the following steps: adding the structure-directing agent, the silicon source and the mineralizing agent into deionized water, and uniformly mixing; adding a palladium source and a copper source, then adding a seed crystal, and crystallizing for a certain time; and carrying out suction filtration, washing, drying, roasting and the like on the obtained sample to prepare the pure silica zeolite DD3R hydrogenation catalyst. The catalyst prepared by the invention is used for a reaction for removing trace acetylene in ethylene through thermocatalytic hydrogenation, has high specific surface area, high catalytic activity, high selectivity and high thermal stability, and can still keep relatively high catalytic activity at a high space velocity.

Compositions and methods for inhibiting and retarding polymerization of monomeric compositions are described that use a naphthoquinone and an oxygenated aminophenol. When present in a monomer-containing composition, the combination of naphthoquinone and oxygen-containing aminophenol provides an unexpectedly beneficial anti-polymerization agent effect, thereby inhibiting the formation of unwanted fouling polymers. The anti-polymerization agent combination can be added to a hydrocarbon composition, such as petroleum, that can include a polymerizable component, such as styrene, wherein the hydrocarbon composition is purified or processed, such as under distillation.

A product and method for reducing fouling of a vinyl aromatic monomer including a first composition comprising an effective amount of one or more dispersants and a second composition comprising an effective amount of one or more polymerization inhibitors, an effective amount of one or more polymerization retarders, or combinations thereof.

The present application relates to a dehydrogenation catalyst, a preparation method and application thereof, and a method for preparing butadiene by butene oxidative dehydrogenation, and provides a dehydrogenation catalyst, which comprises: a spinel phase, an alpha-iron oxide phase, and an antioxidant alloy component; the antioxidant alloy component is selected from at least three of IVB group, VIB group and VIII group; the present application introduces hydrogenation active centers by adding an antioxidant metal alloy component in the spinel structure, and hydrogenation reaction is generated by using a small amount of hydrogen generated in the reaction to inhibit the generation of aldehydes, so that the content of aldehydes in the organic by-products of the dehydrogenation product is greatly reduced, and the selectivity of the catalyst is improved.

This invention discloses an organic polysulfide, its preparation method, and its applications. The organic polysulfide has a sulfur content of 45% or more, preferably 50wt%-80wt%, and the organic sulfur composition contains a cyclic trisulfide CnR2nS3. The preparation method of the organic polysulfide includes the following steps: elemental sulfur and unsaturated hydrocarbons react under the catalysis of an alkaline substance. The reaction temperature is controlled by heating the material system containing elemental sulfur, monitoring the viscosity coefficient of the material system, and recording the temperature of the material system as T when the viscosity coefficient gradually increases. The temperature of the material system is controlled to be 0-15°C above T. After the reaction is continued for a period of time, the temperature is lowered, and the liquid material is separated to obtain the sulfur-containing composition. The organic polysulfide not only has a simple and easy-to-control preparation method, but also contains cyclic organic polysulfide compounds with long sulfur chains and a high mass content of cyclic polysulfide compounds.

The present application relates to chemical technology field, especially a kind of ethane cracking device and start-up emission reduction method, including cracking section, compression section, separation section, separation section includes deethanizer, cold area, hot area, with deethanizer as limit, deethanizer top connects cold area, bottom connects hot area, cold area includes carbon two hydrogenator, demethanizer, ethylene column, cold box, refrigeration system, deethanizer top pipeline is connected with carbon two hydrogenator, hydrogenated material is cooled in cold box, one way output hydrogen, another way is connected with demethanizer, demethanizer top outputs methane, bottom is connected with ethylene column, ethylene column top exports ethylene, bottom exports ethane, refrigeration system is cooled to carbon two hydrogenator export material, demethanizer top, bottom material, ethylene column top, bottom material of ethylene column, the present application has the following beneficial effects: not only can shorten the product qualified time of each system after cracking furnace feed, reduce start-up emission, but also can improve the safety of operation.

Compositions and methods for inhibiting and retarding the polymerization of monomer compositions using naphthoquinones and hydroxylamines are described. When present in a monomer-containing composition, the combination of naphthoquinone and hydroxylamine provides an unexpectedly beneficial polymerization inhibitor effect that inhibits the undesirable formation of contaminating polymers. The polymerization inhibitor combination can be added to hydrocarbon compositions, such as petroleum, which may contain polymerizable components such as styrene, and the hydrocarbon composition is purified or processed, such as by distillation.

The embodiment of the application provides a kind of LNG receiving station gas-liquid mixed phase light hydrocarbon separation process system, it is related to light hydrocarbon cryogenic separation technical field.The first heat exchanger is included;Demethanizer has gas phase outlet and liquid phase outlet, gas phase outlet is set in the top of demethanizer, and liquid phase outlet is set in the bottom of demethanizer, to guide the lean natural gas of demethanizer and demethanization liquid to the outside of demethanizer;First conveying pipeline is used to transport raw material natural gas, first conveying pipeline is connected with the first inlet of demethanizer by first heat exchanger;Second conveying pipeline is used to transport raw material LNG, second conveying pipeline is connected with the second inlet of demethanizer by first heat exchanger, in first heat exchanger, raw material natural gas and raw material LNG are heat exchanged.The light hydrocarbon separation process system provided in the application can improve the recovery rate of light hydrocarbon, reduce the energy consumption of light hydrocarbon separation process, in addition, the process system can gasify LNG, reduce the energy consumption of LNG gasification in the LNG receiving station export process.

A methane purification device 1 comprises a flow path 10 through which a methane-containing gas flows, an ozone supply unit 20 that supplies ozone to the gas, and a non-metallic heater 32, which is arranged downstream of the ozone supply unit 20 in the flow path 10 and heats the gas and the ozone. The heater 32 carries a catalyst for purifying the methane by causing the ozone to react with the methane.

The application discloses a kind of carbon four alkynyl selective hydrogenation catalyst and preparation method thereof, the preparation method includes: the soluble precursor of Ni and the soluble precursor of Cu are dissolved in water, stirring is formed microemulsion, carrier after high-temperature calcination is added to prepared microemulsion and impregnated, dry, calcination, obtain semi-finished product catalyst A;The soluble precursor of Pd is dissolved in water, then semi-finished product catalyst A is added to Pd-containing solution and impregnated, dry, calcination, obtain semi-finished product catalyst B;The soluble precursor of Ce and the soluble precursor of Pt are dissolved in deionized water, semi-finished product catalyst B is impregnated in the solution containing Ce and Pt, after solution is all absorbed, dry, calcination, obtain semi-finished product catalyst C;The soluble precursor of Pb is dissolved in deionized water;Semi-finished product catalyst C is impregnated in the solution containing Pb, after solution is completely absorbed, dry, calcination, obtain final catalyst.

This invention relates to the field of selective hydrogenation technology, specifically to a selective hydrogenation catalyst for alkynes and dienes, its preparation method, and its application. The catalyst provided by this invention uses a modified composite oxide as a support, on which active components are loaded; wherein the modified composite oxide uses a composite oxide as a support, on which alkali metal hydroxides are loaded; the composite oxide includes alumina and zirconium oxide; the active components include nickel, iron, lead, and selenium. The catalyst provided by this invention not only possesses high reactivity and high selectivity, but also avoids excessive hydrogenation to form alkanes, while inhibiting or preventing olefin isomerization to form other isomers. Furthermore, it exhibits high stability, a long single-pass life, and does not require frequent regeneration.

A process for producing a hydrocarbon stream comprising hydrocarbons boiling in the jet fuel range, said process comprising: a) passing a synthesis gas (syngas) stream comprising a carbon oxide and hydrogen over a fixed bed comprising a dual-function catalyst active in the conversion of syngas to the oxygenate(s) methanol (MeOH) and / or dimethyl ether (DME), and the conversion of said oxygenate(s) to an olefin product stream; wherein the dual-function catalyst comprises: a MeOH synthesis catalyst, in which the MeOH synthesis catalyst is a Cu and Cr-free catalyst comprising an oxide of Zn in combination with an oxide of any of: Zr, Al, Si, Ti, Ce, La, Ga, In, Mo, Mn, Mg, Y, or combinations thereof; and an oxygenate conversion catalyst comprising a zeolite with a framework having a 10-ring pore structure, in which the 10-ring pore structure comprises a unidimensional (1-D) pore structure selected from any of: *MRE (ZSM-48), MTT (ZSM-23), TON (ZSM-22), or combinations thereof; b) passing at least a portion of the olefin product stream through an oligomerization step over an oligomerization catalyst, and optionally subsequently conducting a separation step, for thereby producing an oligomerized stream; c) passing at least a portion of the oligomerized stream through a hydrogenation step over a hydrogenation catalyst, and optionally subsequently conducting a separation step, for thereby producing said hydrocarbon stream comprising hydrocarbons boiling in the jet fuel range, optionally also comprising hydrocarbons boiling in the diesel fuel range. The invention provides also a plant for conducting the process.

Methods for producing olefins through hydrocarbon steam cracking include passing a hydrocarbon feed that includes one or more hydrocarbons to a hydrocarbon cracking unit and passing one or more sulfur-containing compounds to the hydrocarbon cracking unit. The sulfur-containing compounds include at least hydrogen sulfide gas, and a flow rate of the sulfur-containing compounds to the hydrocarbon cracking unit is sufficient to produce a molar concentration of elemental sulfur in the hydrocarbon cracking unit of from 10 ppm to 200 ppm. The methods include cracking the hydrocarbon feed in the hydrocarbon cracking unit to produce a cracker effluent and contacting the cracker effluent with a quench fluid in a quench unit to produce at least a cracked gas and a first pygas. The first pygas has a concentration of carbon disulfide less than 50 ppmw based on the total mass flow rate of the first pygas.

The present invention relates to air stable, binary Ni(0)-olefin complexes and their use in organic synthesis.

A method for processing a hydrocarbon-containing mixture includes the steps of: I) separating the hydrocarbon-containing mixture into a light fraction and a heavy fraction; II) reacting the light fraction from step I) in an aromatization unit and separating the resulting reaction product into a C5− component and a C6+ component; III) reacting the heavy fraction from step I) and optionally the C6+ component from step II) in an aromatics conversion unit and separating the resulting reaction product into a C5− component, a C6-C7 component, a C8 component, and a C9+ component; and IV) optionally, steam cracking or catalytic cracking one or both of the C5− component from step II) and the C5− component from step III). The method can convert low-value hydrocarbon mixtures into C8 aromatic hydrocarbons and cracking raw materials, and improve the product value. A system for practicing this method is also provided.

The utility model discloses a polymerization inhibitor separation device for an ethylene quenching oil tower, which belongs to the technical field of ethylene production and comprises a separation barrel, a top cover detachably mounted at the top of the separation barrel, a frame fixedly mounted at the top of the top cover, a motor fixedly mounted on one side of the frame, a bevel gear I fixedly mounted at the output end of the motor, and a bevel gear II fixedly mounted at the output end of the bevel gear I; a sleeve and a second bevel gear are rotationally installed in the frame body, a rotating rod is fixedly installed at the bottom of the second bevel gear, a third bevel gear is fixedly installed at the top of the sleeve, multiple sets of connecting rods are fixedly installed on the outer side of the sleeve, multiple sets of scraping plates are fixedly installed on one sides of the multiple sets of connecting rods, and multiple sets of baffles are fixedly installed on the inner sides of the multiple sets of scraping plates. A plurality of groups of stirring blades are fixedly mounted on the outer side of the rotating rod, and a mounting seat is fixedly mounted at the bottom of the separation barrel, so that a more complex flow field can be generated in the separation barrel through two-way stirring, full mixing of ethylene and a polymerization inhibitor is promoted, and compared with traditional one-way stirring, the mixing effect is more remarkable, and the separation efficiency is improved.

[Problem] To perform selective hydrogenolysis of a cyclic compound that has a five-membered ring structure and that is included in a saturated cyclic compound used as a hydrogen carrier. [Solution] A metal catalyst used in hydrogenolysis of a cyclic compound that has a five-membered ring structure and that is included in a saturated cyclic compound used as a hydrogen carrier, comprises: a silica-based carrier as a catalyst carrier; and iridium or rhodium as a metal supported on the catalyst carrier.

The utility model provides an industrial naphthalene desulfurization device which comprises a lifting mixing structure, the lifting mixing structure comprises a lifting frame, a matching hole is formed in the middle of the lifting frame, connecting holes are formed in the two sides of the interior of the lifting frame, a mounting groove is formed in the outer wall of the lifting frame, and a rotating frame is rotationally connected to the inner wall of the mounting groove; and a rotating frame is arranged on the outer wall of the rotating gear ring. The decahydronaphthalene storage device is reasonable in design, decahydronaphthalene which is subsequently added can be sequentially distributed in the storage shell through the lifting mixing structure which can be lifted, meanwhile, the peripheral rotating gear ring and the rotating frame can be rotated in the lifting process of the lifting frame, and the decahydronaphthalene storage device can be used for storing decahydronaphthalene. And a rotating gear ring and a rotating frame drive a rotating shaft and a stirring rod to rotate to uniformly stir decahydronaphthalene and industrial naphthalene in the storage shell, so that subsequent hydrogen can quickly store industrial naphthalene dissolved in the shell for desulfurization after entering the mixing shell.

The invention relates to a method for preparing biogas and / or natural gas in a preparation system, including the process of separating carbon dioxide and water, in order to produce and / or use liquefied methane and other combustible organic components, having the following steps: - separating carbon dioxide from the biogas in a first stage at a first pressure level so that a pre-purified biogas is provided and / or - separating carbon dioxide from the pre-purified biogas after the first stage and optionally from the natural gas, which is supplied to a second stage (109), in the second stage at a second pressure level, wherein the first pressure level and the second pressure level are different such that biogas and natural gas can be prepared simultaneously at different pressure levels in the preparation system, and - adjusting the water content of the biogas and / or natural gas to a water content of less than 0.1 ppm (v) at the second pressure level by means of a drying stage such that a prepared biogas and / or natural gas is provided which can be supplied directly to a methane liquefaction stage that can be arranged downstream thereof, to a natural gas network, or to a natural gas filling station. The invention additionally relates to a preparation system.

The present application relates to a kind of bifunctional catalyst and its preparation method and application, the catalyst includes catalyst active component and carrier, the active component includes noble metal and non-noble metal, wherein noble metal active component is at least one of Pt, Pd, Ag, Ru and Rh.The non-noble metal active component is Mo and Ni.The catalyst provided by the present application can simultaneously remove acetylene and oxygen impurities in ethylene, wherein acetylene and hydrogen react to generate ethylene, and oxygen and hydrogen react to generate water and are removed.Compared with the catalyst for removing single impurity, the catalyst can reduce the investment of purification device, reduce production cost, and has obvious economic benefits.

The invention relates to a crude styrene decolorization method, which comprises: S1, contacting crude styrene with a nitric acid solution to carry out a decolorization reaction and first oil-water separation so as to obtain a first oil phase; s2, the first oil phase, a first polymerization inhibitor and an alkali solution are in contact for alkali washing and second oil-water separation, and a second oil phase is obtained; s3, the second oil phase, a second polymerization inhibitor and water are in contact for water washing and third oil-water separation, and a third oil phase is obtained; and S4, mixing the third oil phase with a third polymerization inhibitor, and rectifying the obtained mixture. According to the method disclosed by the invention, the polymerization inhibition effect of the polymerization inhibitor can be improved, the loss of styrene in the decoloring process of the crude styrene is effectively reduced, and the premium-grade styrene with the Pt-Co color number being less than 10 can be obtained.

The present invention provides a C4 fraction selective hydroisomerization catalyst, which comprises a carrier and an active component loaded on the carrier, and the carrier is a metal composite oxide modified by an organic cation quaternary ammonium salt and a silane reagent; the metal composite oxide contains a metal element I, and the metal element I comprises aluminum and titanium; the active component contains a metal element II, the metal element II comprises a main active component Cu and an optional auxiliary active component, and the auxiliary active component comprises Ni, Ru and alkali metal. According to the selective hydrogenation catalyst provided by the invention, the carrier is modified, so that the dispersion of the active components on the surface of the carrier can be remarkably improved, and the active components are controlled to exist in a nanocluster form on the surface of the carrier, so that the low-temperature activity of the catalyst prepared from the carrier precursor is remarkably improved. The invention also provides a preparation method and application of the C4 fraction selective hydrogenation isomerization catalyst, and a method for removing butadiene and preparing 1-butene through C4 fraction selective hydrogenation.

The present invention generally relates to compounds and methods for preventing fouling caused by the radical polymerization of unsaturated compounds, particularly vinyl monomers. More particularly, it relates to the use of hindered hydroquinones to inhibit the polymerization, which result in the fouling of process equipment, and prematurely consume the vinylic monomer products.

The present disclosure generally relates to a catalyst composition comprising a porous support; and, disposed on the support: palladium present in an amount in the range of at least 0.005 wt%, e.g., 0.005 to 0.2 wt%, based on the weight of the catalyst composition; and cesium present in an amount in the range of at least 0.01 wt%, e.g., 0.01 wt% to 2 wt%, based on the weight of the catalyst composition. Such materials may also advantageously comprise a metal modifier, such as silver. The materials may be used in the selective hydrogenation of alkynes in olefin streams, for example, in front-end hydrogenation.

The present invention discloses a novel green ethano-terpene solvent of plant origin formed of a synergistic mixture of terpenes and ethanol. It relates to the method for obtaining this solvent, which is based on the recovery of terpene compounds from plants through low-temperature solid-liquid extraction, using ethanol as a GRAS solvent, the method being characterised in that it comprises the following steps: washing the plants with water; removing the washing water; grinding the plants; bringing the plant material into contact with ethanol; removing the residues; decolourising the extract by vacuum evaporation to obtain a transparent solvent rich in terpenes. The green ethano-terpene solvent is characterised by its purity, selectivity, recyclability, biodegradability, and its wide usage in processes for the extraction and / or solubilisation of plant and / or animal and / or prokaryotic biological materials, in synthesis and formulation in the food, pharmaceutical, cosmetic, chemical, perfume and fuel industries, as well as in cleaning and disinfection processes.

The invention provides a device and a method for synchronously separating polymorphic aromatic hydrocarbons in washing water for preparing aromatic hydrocarbons from oxygen-containing compounds and low-carbon olefins, and relates to the technical field of purification treatment. The separation device comprises a solid-phase interception module, a cyclone separation module and a coalescence strengthening module, and the solid-phase interception module, the cyclone separation module and the coalescence strengthening module are connected in series in the water flow direction; wherein the solid phase interception module is used for intercepting and removing solid particles through a fluidization technology. The cyclone separation module is used for primarily separating and recycling free aromatic hydrocarbon based on a cyclone centrifugal separation technology. And the coalescence strengthening module is used for realizing deep separation and recovery of dispersed-state and emulsified-state aromatic hydrocarbons by promoting coalescence of liquid drops and combining gravity settling. The device not only can effectively intercept residual catalyst particles, but also can efficiently and synchronously separate polymorphic aromatic hydrocarbons in a free state, a dispersed state and an emulsified state.