8221results about "Hydrocarbons" patented technology

A method for separating a raw feed gas stream utilizes a compressor, a chiller, a membrane drying stage, and a plurality of membrane separation stages. The raw feed gas stream may comprise biogas. In one example, the raw feed gas stream is supplied to the chiller where it is cooled to a target operating temperature to separate out condensed water. The gas stream is then supplied to a membrane drying stage to separate out water vapor. An off-gas from one of the membrane module stages may be recycled as a low pressure sweep gas on the low pressure side of the membrane drying stage to increase the driving force for water permeation within the membrane drying stage. The gas stream is then supplied to the plurality of membrane separation stages where it is upgraded into a high purity methane stream.

The invention belongs to the technical field of ethylene oligomerization catalysis, and discloses a catalytic system for ethylene selective oligomerization and a preparation method and application thereof, and the catalytic system comprises a carbon bridge bidentate phosphine chromium catalyst, an organic boron auxiliary agent and an aluminum-containing activator in a molar ratio of 1: (1-50): (100-1500). The carbon-chromium catalyst is prepared by the following steps: reacting CrCl3 (THF) 3, a ligand and CH2Cl2 under stirring, filtering, and carrying out post-treatment to obtain the catalyst, the catalyst and the aluminum-containing activating agent are uniformly mixed, and then the organic boron auxiliary agent is added and stirred. The catalyst system constructed by the carbon bridge bidentate phosphine chromium catalyst, the organic boron auxiliary agent and the aluminum-containing activating agent realizes ethylene selective oligomerization. The catalytic system can realize high-efficiency and high-selectivity preparation of 1-hexene and 1-octene under the condition that aluminoxane co-catalysts such as MAO and MMAO are not adopted, the catalytic activity is high, the reaction initiation is rapid, the operation is stable, and the repeatability is good.

The invention provides a method for reducing polymer adhesion in ethylene oligomerization. According to the method, a double-kettle series polymerization process is adopted, a phosphine-nitrogen ligand, a chromium metal compound and a cocatalyst are added into a first reaction kettle, a nucleating agent is added into a second reaction kettle, the reaction is carried out in the first reaction kettle in the early stage and transferred to the second reaction kettle in the later stage for continuous reaction, oligomer is converted into high polymer through the nucleating agent, and the high polymer is stored in a particle form; therefore, the phenomenon that the oligomer winds the stirring paddle is reduced or avoided, the aggregation of the polymer in the reaction kettle is greatly reduced, and the operation time of the device is prolonged. The catalytic system can catalyze the ethylene oligomerization reaction with high activity, the catalytic activity reaches up to 10 * 10 < 6 > g product / (molCr.h), the overall selectivity of 1-hexene and 1-octene with high added values can reach 90% or above, and the phenomenon that a polymer is hung on a stirring paddle is greatly reduced.

A system for generating methane includes a scrubber, a stripper, a vacuum pump, a water separator, and a Sabatier reactor. The scrubber is configured to absorb one or more contaminants from an air stream into a liquid sorbent, in which the one or more contaminants include carbon dioxide. The stripper is configured to desorb the one or more contaminants from the liquid sorbent. The vacuum pump is configured to pressurize the desorbed contaminants to a reaction pressure of the carbon dioxide. The water separator is configured to remove water from the pressurized, desorbed contaminants. The Sabatier reactor is configured to generate the methane from the carbon dioxide of the pressurized, desorbed contaminants.

The present invention provides a divinylbenzylfluorene and a preparation method and application thereof, a divinylbenzylfluorene hydrocarbon resin and a preparation method and application thereof, and relates to the technical field of high-frequency substrate materials. The divinylbenzylfluorene hydrocarbon resin prepared by using one or a mixture of any proportion of 9,9-bis(2-vinylbenzyl)-9H-fluorene and 9,9-bis(4-vinylbenzyl)-9H-fluorene provided by the present invention as raw materials has very low dielectric constant and dielectric loss tangent, and the higher the content of 9,9-bis(2-vinylbenzyl)-9H-fluorene, the smaller the dielectric loss tangent of the divinylbenzylfluorene hydrocarbon resin; moreover, the solubility of 9,9-bis(2-vinylbenzyl)-9H-fluorene and 9,9-bis(4-vinylbenzyl)-9H-fluorene provided by the present invention in toluene and 2-butanone is high, and has good application prospects as a cross-linking agent of the main resin or olefin resin component of a high-frequency substrate.

Process for making sustainable aviation fuel (SAF) from specific bio-ethylene oligomerization reactions producing a C4-C8 alpha-olefin and a by-product mixture of C10 olefins. This mixed decene stream is upgraded by further oligomerizing with at least one C4-C6 alpha-olefin to provide a C16− olefin stream, which is hydrogenated to C16− paraffins which is used to form a SAF. Employing bio-ethylene to produce the mixed decene stream, which is relatively low-value due in part to its non-selectivity, leverages that non-selectivity into a desirable sustainable aviation fuel product where the low selectivity is preferable. These and other embodiments and aspects are described herein.

The invention provides a method for synthesizing 1, 2-bis (4-vinyl phenyl) ethane, which comprises the following steps: adding a first solvent, methyl triphenyl phosphine halide and strong alkali into a reaction flask, and uniformly stirring to obtain a first mixed solution; heating the first mixed solution and carrying out reflux reaction for 1 hour; dropwise adding a 1, 2-bis (p-formaldehyde phenyl) ethane solution until the reflux reaction is finished to obtain a second mixed solution; reducing the temperature of the second mixed solution to room temperature, and adjusting the pH value of the second mixed solution to obtain a first solution; layering the first solution, and taking an organic layer; adding a polymerization inhibitor into the organic layer to obtain a second solution; concentrating the second solution to obtain a 1, 2-bis (4-vinyl phenyl) ethane crude product; adding a poor solvent into the crude product, stirring and crystallizing; filtering the crystal to obtain a filter cake, adding a second solvent into the filter cake, and washing and drying the filter cake to obtain 1, 2-bis (4-vinyl phenyl) ethane; the method for synthesizing the BVPE is simple and low in raw material cost, and the synthesized BVPE is high in purity and free of product isomeride.

The invention relates to the technical field of photocatalysis, in particular to a defect-state titanium dioxide supported catalyst, a preparation method and application of the defect-state titanium dioxide supported catalyst in a reaction for co-converting methane and carbon dioxide. The defect-state titanium dioxide supported catalyst comprises a carrier and metal Au supported on the surface of the carrier; the carrier is a defect-state titanium dioxide nanosheet with oxygen vacancies. According to the invention, the defect-state titanium dioxide nanosheet is used as a carrier, and after metal particles (Au) are loaded, the metal particles are used as capture centers of photo-induced electrons to promote spatial separation of photo-induced electron-hole pairs. In addition, the formed metal-carrier interface site effectively enhances the adsorption and activation of CH4 and CO2 by the photocatalyst. Moreover, the loaded high-electronegativity metal Au can also be used as a coupling site of methyl, so that high-yield C2H6 is obtained, and meanwhile, a corresponding CO product is obtained.

A light hydrocarbon aromatization catalyst capable of increasing the yield of light alkane comprises a hydrogen type Silicalite-1 (at) ZSM-5 core-shell molecular sieve, an active metal and / or a binder, the hydrogen type Silicalite-1 (at) ZSM-5 core-shell molecular sieve takes a Silicalite-1 molecular sieve as a core layer and a ZSM-5 molecular sieve as a shell layer, and the particle size of the hydrogen type Silicalite-1 (at) ZSM-5 core-shell molecular sieve is 90-140 nm. The catalyst is applied to light hydrocarbon aromatization reaction, has higher low-carbon alkane yield and lower dry gas yield, and is good in stability, long in one-way reaction period and low in carbon deposit amount.

The present invention belongs to the technical field of design and synthesis of carbon-monoxide and carbon-dioxide-based Fischer-Tropsch synthesis catalysts, and discloses a novel iron-based Fischer-Tropsch synthesis catalyst containing both iron and carbon and a synthesis method and use thereof. The present invention specifically relates to a catalyst mixture for use in hydrogenation of CO and / or CO2, which catalyst mixture comprises i) iron oxide promoted by alkali metal, alkaline earth metal or transition metal, and ii) iron carbide. The invention further relates to a method for production of iron carbide composite comprising different iron carbides, and the use of said carbide composite in combination with alkali metal, alkaline earth metal or transition metal promoted iron oxide for use in hydrogenation of CO and / or CO2.

The invention discloses a catalyst for preparing propylene through propane dehydrogenation as well as preparation and application of the catalyst. The catalyst comprises a tin-containing spherical alumina carrier and noble metal Pt, and a preparation method of the tin-containing spherical alumina carrier comprises the following steps: mixing aluminum hydroxide sol with acidic silica sol, dropwise adding the obtained mixture into an oil-ammonia water-oil-water four-layer mixed column, molding, drying and roasting to obtain the tin-containing spherical alumina carrier; the oil-ammonia water-oil-water four-layer mixing column is sequentially provided with four layers from top to bottom, the first layer is a first oil layer, the second layer is an ammonia water layer, the third layer is a second oil layer, and the fourth layer is a tin-containing water layer. When the catalyst is applied to propane dehydrogenation propylene preparation reaction, the activity of the catalyst can be remarkably improved.

A device for preparing chemicals through waste plastic and crude oil mixed feeding grading gas-phase dehydrogenation cracking is composed of a waste plastic self-hot-melting dechlorination pretreatment subsystem, a waste plastic melting liquid and crude oil selective vaporization dehydrogenation cracking subsystem, a high-temperature cracked oil gas gas-phase catalytic cracking subsystem and a cracked oil gas fractionation and refining subsystem. A recycle oil pipeline and a cracking dry gas pipeline of the cracking oil-gas fractionation and refining subsystem are respectively connected to a high-temperature molten oil inlet and a feeding carrying gas inlet of the waste plastic self-heating melting dechlorination pretreatment subsystem, and a waste plastic molten liquid delivery pipeline of the waste plastic self-heating melting dechlorination pretreatment subsystem is connected to a crude oil feeding pipeline; a waste plastic and crude oil mixed feeding pipeline is connected into the waste plastic molten liquid and crude oil selective vaporization dehydrogenation cracking subsystem through an atomizing nozzle, selective vaporization dehydrogenation cracking and gas-phase catalytic cracking are sequentially completed in a grading mode, and then the cracked oil gas fractionation and refining subsystem produces triene tribenzene, high-temperature recycle oil and cracked dry gas.

The invention relates to the technical field of ZSM-5 molecular sieve preparation, and provides a high-crystallinity aluminum-rich ZSM-5 molecular sieve as well as a preparation method and application thereof. According to the preparation method of the high-crystallinity aluminum-rich ZSM-5 molecular sieve provided by the invention, after the second aluminum source is added, secondary crystallization is carried out, so that the skeleton composition control of the ZSM-5 molecular sieve is realized, the technical bottleneck that the high-crystallinity aluminum-rich ZSM-5 molecular sieve is difficult to directly synthesize is solved, the lower limit of a Si / Al specific phase region of an artificial in-situ synthesized molecular sieve is broken through, and the preparation method is simple and convenient. The method effectively controls crystal parameters, improves production efficiency and realizes precise construction of the high-crystallinity aluminum-rich ZSM-5 molecular sieve, so that the microporous crystallinity of the molecular sieve is enhanced, the acid distribution of the molecular sieve is optimized, the metastable state surface active acid center distribution of the molecular sieve is greatly enriched, and the molecular sieve has good aromatic hydrocarbon conversion performance.

Processes for producing linear alkylbenzenes from natural oils incorporating hydrogen and heat integration are described. The processes include recycling at least a portion of the hydrogen stream to the linear selective cracking unit, and heating exchanging the paraffin stream, or the C9 to C14 stream, or the C14+ stream, or the first stream, or the second stream, or combinations thereof with the dehydrogenated stream, or the alkylation effluent stream, or both; or providing heat from deoxygenating the natural oil to the linear selective cracking unit, or the dehydrogenation unit, or the alkylation unit, or combinations thereof, or both.

Processes for preparing Compound I, and pharmaceutically acceptable salts and solvates thereof, pharmaceutically acceptable solid (e.g., crystalline or amorphous) forms of Compound I, pharmaceutical compositions comprising the same, methods of treating pain using the same, and methods for making the same are disclosed.

The invention belongs to the field of catalyst regeneration, and provides a regeneration method of a platinum-based low-carbon alkane dehydrogenation catalyst, which specifically comprises the following steps of: simultaneously carrying out charking and oxychlorination operations before a deactivated catalyst reaches the highest roasting temperature, and adding agent pouring treatment in the regeneration process, and measures for protecting the dispersity of platinum on the catalyst are added in the reaction heating process of the catalyst and after the application is finished, so that the service life of the catalyst is prolonged. According to the regeneration method, the regeneration step of the deactivated catalyst is simplified, chlorine injection, water injection, vulcanization and other operations are not needed, charking, oxychlorination and different reduction depths caused by different positions of the catalyst are avoided, the performance uniformity of the catalyst and the redispersity of platinum are improved, and the regeneration efficiency is improved. The problems that in an existing regeneration method, the dispersity of active components is low, the number of repeated regeneration times is small, and the performance of the catalyst is reduced are solved, the regenerated catalyst obtained through the regeneration method is not lower than that of a fresh catalyst in the aspects of catalyst conversion rate, selectivity and stability, and the regeneration effect is remarkable.

The invention relates to the field of chemical engineering, in particular to an n-hexane separation technology, and more particularly relates to a method and a device for preparing electronic-grade n-hexane. The method for preparing the electron n-hexane comprises the following steps: S1, introducing an adsorbent into an n-hexane raw material to remove moisture in the n-hexane, and then carrying out catalytic hydrogenation reaction to obtain crude n-hexane; and S2, carrying out primary filtration on the material subjected to catalytic hydrogenation, then carrying out light component removal and heavy component removal two-stage rectification to obtain high-purity n-hexane, and carrying out secondary filtration on the high-purity n-hexane to obtain the electronic-grade n-hexane. The device for preparing the electronic-grade n-hexane comprises a raw material tank, an adsorption tower, a catalytic hydrogenation reactor, an intermediate tank, a light component removal tower, a heavy component removal tower and a product tank which are connected in sequence. According to the preparation method and device, high-purity electronic-grade n-hexane meeting the strict requirements of the semiconductor industry can be produced, the process steps are simple, industrial production is easy to achieve, the product quality is stable and reliable, and high economic and social benefits are achieved.

The invention provides a methane recovery and purification system in intelligent cleaning equipment, which relates to the technical field of environmental protection, and is characterized in that methane-containing gas is collected from the cleaning equipment, moisture and small particles in the gas are removed to obtain preliminarily purified gas, and then methane is separated and recovered by using a separation technology to obtain purified gas. And the purified methanol is obtained through multi-stage purification treatment. According to the methane recovery technology, a time sequence of gas components, a time sequence of physical properties and a time sequence of process parameters need to be obtained, and local time sequence coding and causal context time sequence aggregation are carried out, so that a separation technology recommendation result is recommended, and operation parameters are dynamically adjusted. Therefore, subjective experience can be abandoned, gas characteristics and process requirements are monitored in real time and accurately matched, the accuracy and objectivity of separation technology selection are improved, and it is ensured that the separation process is always in the optimal state.

A process for distilling a raffinate 2 stream as feed stream in at least two distillation columns DK1 and DK2 has two different inlets for the feed stream in at least the distillation column DK1. It is a feature of the process that the feed stream is analysed for its composition before being introduced; and one of the at least two inlets for the feeding of the feed stream is chosen depending on the composition of the feed stream.

The invention relates to a method for synthesizing 1, 2-allene ketone, and discloses a method for synthesizing 1, 2-allene ketone by taking eneyne, 1, 4-dihydropyridine and benzoyl fluoride as substrates, 2, 4, 5, 6-tetra (diphenylamino)-isophthalonitrile as a photocatalyst, 5, 6, 7, 8-tetrahydro-3-(2, 6-diisopropyl phenyl)-4H-cycloheptyl thiazole perchlorate as N-heterocyclic carbene, cesium carbonate as alkali and acetonitrile as a solvent through a one-pot method. And reacting at room temperature for 4 hours under visible light of 12W and 460nm LED blue light to obtain allene ketone. The reaction conditions are mild, and the method has good functional group tolerance.

Processes are disclosed for the production of liquefied petroleum gas (LPG) hydrocarbons, utilizing both alcohol (e.g., methanol) synthesis and in situ dehydration of the alcohol to hydrocarbons, and particularly propane and / or butane. Operational adjustments and / or variations, involving activation of LPG synthesis catalyst systems at relatively high temperatures, followed by initial operation at relatively low temperatures, surprisingly lead to improvements in the stability of such catalyst systems. These improvements are often in conjunction with other benefits, for example greater selectivity and / or per-pass yield, with such improvements and benefits resulting from the ability to operate at reduced temperatures. Problems typically encountered in the art due to catalyst instability, such as the need for frequent replacement and / or regeneration, are thereby potentially reduced or even eliminated.

The utility model relates to the technical field of mixed xylene refining and purifying, in particular to a mixed xylene refining and purifying device. Comprising a shell, the upper end of the shell fixedly communicates with an inlet pipe, the lower end of the shell fixedly communicates with an outlet pipe, a temperature control assembly is arranged in the upper portion of the shell, and an interception assembly is arranged in the lower portion of the shell and communicates with a condenser. By monitoring the temperature of the heat-conducting medium in the oil outlet pipe in real time, the high-temperature gaseous water-containing mixed xylene can be effectively cooled.

A catalyst and methods for making the catalyst are provided. An exemplary catalyst includes the formula: MoaVbTec-TadOx. In this formula, a is 1.0, b is about 0.01 to about 0.3, c is about 0.01 to about 0.09, d is about 0.01 to about 0.05, and x is the number of oxygen atoms necessary to render the catalyst electronically neutral.

The invention belongs to the technical field of petrochemical engineering, and particularly relates to a thermal auxiliary material for promoting alkane dehydrogenation reaction efficiency and a preparation method and application thereof. The auxiliary material is composed of a heating main body, a heat storage carrier, a stabilizing auxiliary agent and a carrier auxiliary agent. Wherein the component of the heating main body is CuO; the component of the heat storage carrier is CaO-Al2O3 composite oxide; the stabilizing auxiliary agent is one or more of Cr2O3, La2O3, CeO2 and ZrO2; and the carrier auxiliary agent is one or more of MgO, BaO, NiO and Fe2O3. The thermal auxiliary material with high mechanical strength, high heat transfer performance and high stability is synthesized through the steps of coprecipitation reaction, high-temperature hydrothermal reaction, high-temperature calcination, vacuum impregnation, ultrasonic oscillation and the like; when the material is applied to an alkane dehydrogenation olefin preparation device, alkane conversion rate and olefin selectivity can be improved, the service life of a catalyst can be prolonged, and energy consumption of the device can be reduced.

The invention relates to the technical field of catalyst carriers, and discloses reticular porous spherical aluminum oxide as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing an aluminum source, acid, a pore-forming agent, a surfactant and water to obtain pseudo sol; (2) performing ultrasonic treatment and oil ammonia column forming treatment on the pseudo sol obtained in the step (1) to obtain gamma-Al2O3 spherical gel beads; and (3) aging, washing, drying and calcining the gamma-Al2O3 spherical gel beads obtained in the step (2) to obtain the reticular porous spherical alumina. The spherical aluminum oxide prepared by the method has abundant communicated reticular pore channels, is obviously distributed in mesopore and macropore ranges, is beneficial to obviously improving dispersion and loading of a catalyst in an aluminum oxide carrier and improving the performance of petroleum reforming and propane dehydrogenation, and has industrial production utilization value and commercial value.

A Liquid Organic Hydrogen Carrier (LOHC) dehydrogenation system is described, capable of meeting time-variable hydrogen demands with short dynamics while always ensuring a high degree of dehydrogenation under all operating conditions. The system comprises one or more reactors comprising an LOHC vessel and a recirculation circuit comprising a recirculation pump, a preheater capable of supplying the reaction heat as sensible heat, and a cartridge containing the solid catalyst.

The invention provides a preparation method and application of a catalyst for methane normal hexane co-aromatization, a simple in-situ hydrothermal synthesis method is adopted, platinum and nickel are dispersed in a ZSM-5 molecular sieve, and a metal packaging type NiPt-coated ZSM-5 catalyst is synthesized. When the catalyst is applied to methane and normal hexane co-aromatization reaction, the catalyst shows relatively high methane conversion rate and aromatic hydrocarbon selectivity. The molecular sieve packaging mode not only can improve the dispersity of the active component so as to improve the capability of activating methane, but also can improve the high-temperature stability of the active component and prolong the service life of the catalyst, and can effectively solve the problems of high reaction temperature and poor catalyst stability in the existing methane aromatization technology. And the method has a good practical application prospect.

The invention relates to the technical field of catalysts, in particular to a dehydrogenation catalyst precursor, a dehydrogenation catalyst and a preparation method and application of the dehydrogenation catalyst precursor. According to the dehydrogenation catalyst precursor, a sulfur-modified magnesium-aluminum mixed oxide is used as a carrier, and a Pt metal cluster is used as an active center; wherein the carrier is a mixed-state metal oxide with a layered hydrotalcite structure, a spinel structure and a near-crystalline synergistic structure. A magnesium-aluminum mixed oxide can be prepared by introducing a precursor of alkali metal magnesium into an aluminum oxide precursor, a layered structure or a spinel structure similar to hydrotalcite can be formed by regulating and controlling the calcination temperature, and by combining carrier surface regulation and control modification, the capability of regulating and controlling the interaction between metal and a carrier can be improved, and the performance of the catalyst is improved. Therefore, the active center of the cluster is maintained, and the acid-base property of the surface of the carrier is effectively modulated, so that carbon deposit is reduced, and the activity and stability of the catalyst are improved.

The invention provides a synthetic method of high-purity p-methylstyrene. The method comprises the following steps: carrying out alkylation on toluene and catalytic dry gas in a modified ZSM-5 catalyst to generate methyl-ethylbenzene, carrying out adsorption separation on the methyl-ethylbenzene to obtain high-purity p-methyl-ethylbenzene, and carrying out high-temperature dehydrogenation on the p-methyl-ethylbenzene in the presence of an iron-based catalyst to obtain the high-purity p-methyl styrene. According to the method, based on the synergistic effect of a preparation process and an alkylation reaction catalyst, the para-selectivity of the alkylation reaction catalyst is strictly controlled, so that the selectivity of the catalyst is ensured, the service life of the catalyst is greatly prolonged, and furthermore, a simulated moving bed is utilized to adsorb and separate methyl ethylbenzene isomers, separate, purify and recycle; the raw material utilization rate and the product purity are improved, and the purity of the finally obtained p-methylstyrene is 99% or above.

The invention relates to the field of plastic degradation, in particular to a polystyrene hydrocracking method. Comprising the following steps: respectively adding a metal sulfide catalyst and polystyrene into a suspended bed reactor, sealing the suspended bed reactor, introducing hydrogen with a certain pressure, and starting a reaction; the polystyrene hydrocracking method provided by the invention adopts the non-noble metal catalyst, and is more economical. The problem that polystyrene is easy to generate hydrogen by self-cyclization and polycyclic aromatic hydrocarbon is formed is solved; meanwhile, the problems of benzene ring hydrogenation and aromatic hydrocarbon selectivity reduction are solved, and the yield of monocyclic aromatic hydrocarbon is up to 90%. The method can realize complete cracking of waste polystyrene, and has good economic benefits.