137results 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.

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)

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.

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 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.

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 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 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.

The utility model relates to the technical field of chemical production, and discloses a methane hydrogen recovery device which comprises a regeneration gas unit, a regeneration gas separation tank, a methane hydrogen compressor, a first overline pipeline and a second overline pipeline, the regeneration gas separation tank is connected with the regeneration gas unit through a second main pipeline, the methane hydrogen compressor is connected with the regeneration gas separation tank through a third main pipeline, and the methane hydrogen compressor is connected with the hydrogen production device through a fourth main pipeline; the first overline pipeline is connected with the first main pipeline and the second main pipeline, the second overline pipeline is connected with the first main pipeline and the third main pipeline, and each overline pipeline is provided with a regulating valve. Compared with the prior art, the methane hydrogen recovery device fully recovers the surplus methane hydrogen of the ethylene device and uses the surplus methane hydrogen as a raw material of the hydrogen production device, so that the problem that the surplus methane hydrogen of the ethylene device in the prior art can only release a torch is solved.

The application provides a C5 fraction selective hydrogenation catalyst and a preparation method thereof, the carrier of the catalyst comprises alumina with a bimodal pore distribution structure, the pore diameter of small pores is 7-40 nm, and the pore diameter of large pores is 60-300 nm; the active component comprises Pd, Ni, Cu, Ce, Pt and Zn, the content of Pd is 0.2%-0.48% based on 100% of the mass of the catalyst, the content of Zn is 0.01%-3%, the content of Ni is 0.5%-5%, the mass ratio of Cu to Ni is 0.1-1:1, the content of Ce is 0.1%-0.5%, the content of Pt is 0.005%-0.05%, and Ni-Cu is loaded by a microemulsion method. The cracking C5 fraction selective hydrogenation catalyst provided by the application has good selectivity, anti-coking property and regeneration performance: after 5 times of regeneration, the catalyst still has excellent hydrogenation activity, selectivity and anti-coking property.

A method of making a selective hydrogenation catalyst includes forming a mixed phase alumina support having a BET surface area in the range of between approximately 30 to approximately 60 square meters / gram (m2 / g). The mixed phase alumina support includes alpha alumina and theta alumina. The method also includes impregnating the mixed phase alumina support with an impregnation solution having one or more metals selected from Group VIIIB, Group IB, or both of the Periodic Table of Elements to form an impregnated support, drying the impregnated support at a temperature in the range of between approximately 100 degrees Celsius (°C) and 150 °C to form a dried impregnated support, calcining the dried impregnated support at a temperature range of between 350 °C and approximately 500 °C to form a calcined impregnated support, and reducing the one or more metals on the calcined impregnated support at a temperature in the range of between approximately 400 °C and approximately 600 °C in the presence of hydrogen to form the selective hydrogenation catalyst.

An inhibitor composition is provided for mitigating undesired polymerization in the vapor space during the purification of reactive vinyl monomers. The polymerization inhibitor composition includes at least a first inhibitor compound having a stable nitroxide radical and a second inhibitor comprising a phenylenediamine. Methods of inhibiting polymerization of monomers in a vapor space using the disclosed compositions are also provided.

The utility model discloses a crude benzene dehydration device, and relates to the technical field of crude benzene processing equipment, in particular to a crude benzene dehydration device which comprises a tank body and a stirring component, and the stirring component comprises a driving part, a rotating cylinder, a U-shaped frame and a plurality of turbulent flow assemblies; the multiple turbulent flow assemblies are arranged, each turbulent flow assembly comprises the rotating shaft, the third gear and the two rotating plates, and the third gears are meshed with the racks in the rotating cylinder, so that the rotating plates can generate the multi-direction turbulent flow effect in the rotating process. The multi-direction turbulent flow can fully mix crude benzene and anhydrous sodium sulfate, and the contact area is increased, so that the dehydration efficiency is remarkably improved. In addition, the U-shaped frame is controlled to slide up and down in the rotating cylinder through the linkage assembly, the stirring depth can be adjusted, and the dehydration effect is further optimized. Compared with the prior art, the stirring mode is more diversified, anhydrous sodium sulfate can be effectively prevented from sinking to the bottom, and the dehydration efficiency is improved.

The present disclosure relates generally to a catalyst composition including a porous support; and, disposed on the support: palladium, present in an amount of at least 0.005 wt%, e.g., in the range of 0.005 wt% to 0.2 wt%, based on the weight of the catalyst composition; and cesium, present in an amount of at least 0.01 wt%, e.g., in the range of 0.01 wt% to 2 wt% based on the weight of the catalyst composition. Such materials can advantageously also include a metallic modifier such as silver. The materials are useful in selective hydrogenation of alkynes in olefin streams, e.g., in front-end hydrogenations.

The present application relates to the technical field of high-frequency substrate materials, and provides bis(vinylbenzyl)fluorene and a preparation method therefor and the use thereof, and a bis(vinylbenzyl)fluorene hydrocarbon resin and a preparation method therefor and the use thereof. The bis(vinylbenzyl)fluorene hydrocarbon resin provided in the present application, which is prepared by using one of 9,9-bis(2-vinylbenzyl)-9H-fluorene and 9,9-bis(4-vinylbenzyl)-9H-fluorene or a mixture of same at any ratio as a raw material, has a very low dielectric constant and dielectric loss tangent. Moreover, the higher the content of 9,9-bis(2-vinylbenzyl)-9H-fluorene, the smaller the dielectric loss tangent of the bis(vinylbenzyl)fluorene hydrocarbon resin. Furthermore, 9,9-bis(2-vinylbenzyl)-9H-fluorene and 9,9-bis(4-vinylbenzyl)-9H-fluorene provided in the present application have high solubility in toluene and 2-butanone, and have good application prospects as main resins for high-frequency substrates or as cross-linking agents for alkenyl resin components.

The invention provides a high-efficiency ethylene preparation method, and relates to the technical field of chemical synthesis. According to the method, ethephon ClCH2CH2PO (OH) 2 is used as an ethylene precursor, barium hydroxide Ba (OH) 2 is used as an alkaline reaction medium, ethylene is efficiently prepared through hydrolysis reaction at normal temperature, and high temperature and strong acid are not needed in the core reaction. The core innovation lies in that a'mild hydrolysis-directional gas production 'technology is adopted, the raw material ratio and reaction conditions are optimized, rapid gas production within 1 minute is realized, and the purity of ethylene is greater than or equal to 92%; the raw materials are easy to purchase, low in price and high in safety, byproducts can be recycled, and the problems that a traditional concentrated sulfuric acid dehydration method is high in corrosion risk, large in energy consumption and many in byproducts are solved. The method is easy and convenient to operate and visual in phenomenon, the gas production efficiency is improved by 60% or above compared with that of a traditional method, the cost is reduced by 50%, the ethylene property verification requirement in teaching is met, efficient preparation of small experiment scenes is also adapted, and remarkable safety, economical efficiency and practicability are achieved.

The utility model discloses an energy-saving optimization system for producing isobutene through butene isomerization. The energy-saving optimization system comprises a reaction system, a gas-liquid separation tank, a compressor and a separation system, the mixed C4 enters a reaction system for reaction, the reaction system is communicated with a gas-liquid separation tank, a gas phase of the gas-liquid separation tank is communicated with a compressor, the compressor is communicated with a separation system, a liquid phase of the gas-liquid separation tank is communicated with the separation system, and the separation system outputs an isobutene product; the reaction system comprises a feeding and discharging heat exchanger, a heating furnace and an isomerization reactor, the feeding and discharging heat exchanger is communicated with the heating furnace, the heating furnace is communicated with the isomerization reactor, the isomerization reactor is communicated with the feeding and discharging heat exchanger, and the feeding and discharging heat exchanger is communicated with the gas-liquid separation tank. Reaction products enter the compressor without being cooled by the cooler, consumption of cooling water is reduced, the reaction products enter the separation system after being compressed at high temperature, consumption of steam and cooling water of the separation system is reduced, energy is saved, and energy consumption is reduced.

Processes for producing mono-methyl alkylbenzenes from natural oils are described. The processes includes a linear selective cracking process to crack C14+ chains into C9 to C14 chains which are useful for making linear alkylbenzene for use in detergents and a hydroisomerization step to produce paraffins with mono-methyl branching which can be reacted with benzene to form the mono-methyl alkyl benzenes.

A method for inhibiting polymerization, gum formation and fouling of an atypical, high temperature ethylene fractionation train comprising treating the atypical, high temperature ethylene fractionation train with a composition including effective amounts of one or more quinone methides of the formula:wherein R1, R2, and R3 are independently selected from the group consisting of H, —OH, —SH, —NH2, alkyl, cycloalkyl, heterocyclo, and aryl; or one or more phenylene diamines, optionally, in combination with one or more hindered phenols.

The utility model relates to the technical field of methane recovery, in particular to methane condensation recovery equipment which comprises a device tank, a first partition plate is mounted in the device tank, a partition block is mounted on one side of the first partition plate, a first movable plate is arranged on one side of the partition block, a push plate is connected to the bottom side of the first movable plate, and a push block is mounted on the bottom side of the push plate. And a collecting frame is arranged on the outer side of the pushing block, a discharging opening is formed in the collecting frame, an inlet and a discharging end are further formed in the device tank, outer rotating rods are further rotationally connected between the inner walls of the device tank, and an inner rotating rod is connected between the outer rotating rods. According to the scheme, the possibility that a large number of other substances are mixed with condensed methane in the methane condensation process is reduced, the working time of high-purity methane in the condensation process is shortened, and the simple condensation separation effect can be improved, so that the condensation purity is improved, and the rapid condensation effect of the device is also improved.

The present application belongs to the technical field of chemical production device and method, and particularly relates to a system and method for producing high-purity isobutane by coupling carbon four hydrorefining and n-butane isomerization. The system for producing high-purity isobutane by coupling carbon four hydrorefining and n-butane isomerization comprises a hydrogenation reactor system, an n-butane isomerization reactor system, a stabilizing tower system, a de-isobutane tower system, a de-heavy tower system and an n-butane drying system. The outlet of the hydrogenation reactor system is connected to the inlet of the n-butane isomerization reactor system. The outlet of the n-butane isomerization reactor system is connected to the inlet of the stabilizing tower system. The outlet of the stabilizing tower system is connected to the inlet of the de-isobutane tower system. The outlet of the de-isobutane tower system is connected to the inlet of the de-heavy tower system. The outlet of the de-heavy tower system is connected to the inlet of the n-butane isomerization reactor system through the n-butane drying system. The outlet of the stabilizing tower system is connected to the alkali washing tower system. The system and method for producing high-purity isobutane by coupling carbon four hydrorefining and n-butane isomerization have the advantages of simple process, low investment, low energy consumption, high separation precision and high isobutane yield.

Disclosed are antioxidants used in compositions and methods to stabilize synthetic feedstock derived from plastic. Some methods disclosed herein include adding an antioxidant composition to a plastic-derived synthetic feedstock composition. Some methods disclosed herein include heating plastic under substantially oxygen free conditions at a temperature of from about 400° C. to about 800° C. to produce a pyrolysis effluent, distilling the pyrolysis effluent, recovering the synthetic feedstock, and adding a stabilizer to the synthetic feedstock to reduce contamination. The disclosure also provides compositions including a synthetic feedstock derived from plastic and an antioxidant.