67results about "Absorption purification/separation" patented technology

A process for preparing an olefin stream for oligomerization includes fractionating the olefin stream to provide a light gas stream and an olefin-rich stream. Oxygenates are absorbed from the olefin-rich stream into a water wash stream to provide an oxygenate-rich water wash stream and a washed olefin stream. The washed olefin stream can then be oligomerized.

The invention relates to the technical field of dry gas treatment, and discloses a method and a device for preparing polymer grade ethylene by recovering C2 components in dry gas and application, the method comprises the following steps: (1) compressing the raw material dry gas and carrying out gas-liquid separation to obtain a gas phase and a liquid phase; (2) contacting the gas phase with an absorbent for C2 component absorption to obtain absorption tail gas and an absorption rich solution; (3) performing methane desorption on the liquid phase to obtain desorbed gas and a rich absorbent; (4) desorbing and separating the rich absorbent to obtain a lean absorbent and concentrated gas; (5) the concentrated gas is subjected to acid gas removal, dehydration and impurity removal and then sent to a deethanizer for separation of light components and heavy components, and a gas phase at the top of the tower serves as feed to enter an ethylene rectifying tower for separation of ethylene and ethane; and (6) extracting a polymer-grade ethylene product from the side of the body of the ethylene rectifying tower. The C2 component recovered by the method has the advantages of high purity, high recovery rate, simple process, low steam consumption, no need of a deoxidation reactor and a demethanizer, and low energy consumption of the device.

The invention discloses an after-deacetylation product gas separation process for methanol-to-olefin, which belongs to the field of organic chemical industry and comprises the following steps: pre-treated and dehydrated product gas enters a C2 and C3 cutting tower, a tower top gas phase is condensed and then partially refluxed, and the rest enters the tail section of a product gas compressor; and the tower kettle material enters a depropanizing tower. And a liquid-phase material at the top of the depropanizing tower is selectively fed into the downstream demethanizing tower or deethanizing tower through a pump. The C2 and C3 cutting and fractionating system is adopted, the material flow direction is optimized, the suction load of the tail section of a product gas compressor and the propylene refrigerant consumption of a subsequent demethanizing tower are greatly reduced, and meanwhile, the material circulation amount and the washing liquid requirement in the system are reduced, so that the equipment investment and the device operation energy consumption are remarkably reduced; and the technological process is simplified.

The invention relates to the technical field of aromatic hydrocarbon separation and purification, in particular to a system and process flow for removing C8 non-aromatic hydrocarbon in xylene through membrane separation, and the system comprises a membrane separation unit, a feeding unit, a permeation side system, an interception side system, an adsorption tower feeding buffer tank outlet line and a crossover line; the membrane separation unit is provided with a membrane feeding pipeline, one end of the membrane separation unit is connected to an outlet of the membrane separation feeding buffer tank, and the other end of the membrane separation unit is connected to an inlet side pipe orifice of the separation pipeline; a membrane feeding booster pump is arranged on the membrane feeding pipeline; a spiral-wound membrane assembly is arranged in the separation pipeline; the feeding unit is provided with a xylene redistillation tower top outlet line which is connected to an inlet of the membrane separation feeding buffer tank from the xylene redistillation tower top. According to the membrane separation process adopted by the method, the non-aromatic hydrocarbon removal rate can be more than 98% under the operation conditions that the feeding pressure is 1.68 MPa, the permeation side is 20 kPa and the interception side is 1.6 MPa, and the method has definite industrial feasibility and technical advantages.

The application discloses a biomass fermentation process for preparing green methanol, which comprises the following steps: providing a biomass raw material, and fermenting to obtain biogas; obtaining rich-methane gas after crude purification of the biogas; obtaining qualified rich-methane gas after super-precision detoxification of the rich-methane gas; adding medium-pressure steam into the qualified rich-methane gas, and performing a methane steam reforming reaction to obtain a mixed gas; performing PSA treatment on the mixed gas to obtain a resolved gas and a raw material gas; and feeding the resolved gas into a normal-temperature catalytic heat exchange system, and taking the raw material gas as one of raw materials for methanol synthesis to prepare refined methanol. The application realizes full-chain coupling and efficient utilization, combines biomass fermentation, biogas purification and methane steam reforming, and adopts a CO2 circulation technology. The application realizes full-process energy integration: the waste heat in the fermentation process, the waste heat of the PSA resolved gas and the waste water of rectification are utilized to drive the methane steam reforming reaction, the system energy consumption is reduced, and the economic efficiency and sustainability of the system are further improved.

The invention belongs to the technical field of natural gas treatment, and discloses a process and a system for recovering ethane and other light hydrocarbon components from oilfield associated gas. A washing tower is arranged before dehydration, heavy hydrocarbon components in the oilfield associated gas are removed, the influence of the heavy hydrocarbon components on a molecular sieve dehydration device is reduced, the service life of a molecular sieve is prolonged, and a liquid phase separated by a low-temperature separator is cooled by a cold box to be cooled and throttled to enter the top of a demethanizing tower; and the low-temperature freezing blockage influence of the carbon dioxide component on the demethanizer can be well reduced.

A hydrocarbon isomerization system for an iC4 feed stream that provides for removal of C3s from an isomerization reactor feed stream by the addition of a depropanizer column to remove C3s from the reactor effluent stream after it has passed through a stabilizer column. This configuration prevents a buildup of C3s in the system and provides significant savings by reducing the size of the chloride treaters that are used to remove chlorides from off gas, increasing chlorides recovered to the hydrocarbon feed stream for use in combination with the isomerization catalyst. Significant utility savings are provided as well as a reduction in the amount of perchloroethane (PERC) and adsorbent that are required.

The utility model belongs to the technical field of methyl tert-butyl ether cracking, and particularly relates to a device for producing isobutene by cracking methyl tert-butyl ether. The device for producing isobutene by cracking methyl tert-butyl ether comprises an MTBE refining tower, the MTBE refining tower is connected with a cracking reactor, the bottom of the cracking reactor is sequentially connected with a condensate water cooler and a circulating water cooler, the circulating water cooler is connected with an absorption cooling tower, the absorption cooling tower is connected with a compressor inlet buffer tank, and the compressor inlet buffer tank is connected with a compressor outlet buffer tank. The compressor inlet buffer tank is connected with the gas production compressor; and the gas production compressor is connected with the isobutene water washing tower. According to the device for producing isobutene by cracking methyl tert-butyl ether, the condensate water cooler and the circulating water cooler are arranged and are matched with the light component removal tower reboiler, so that the cyclic utilization of heat is realized, and the energy consumption of the device is reduced; meanwhile, the isobutene water washing tower and the methanol water collecting tank are arranged, so that the loss of methanol is reduced, and the purity of an isobutene product is improved.

Provided is a method for upgrading a bio-based material, the method including the steps of pre-treating bio-renewable oil(s) and / or fat(s) to provide a bio-based fresh feed material, hydrotreating the bio-based fresh feed material, followed by separation, to provide a bio-propane composition.

The present invention aims to provide a separation apparatus that can relatively improve the purity of ethylene and propylene while relatively reducing the amount of coolant used, as well as a method for separating ethylene and propylene. [Solution] The separation apparatus according to the present invention is a separation apparatus for separating ethylene and propylene from a gas composition containing ethylene, propylene, water and an organic compound, and has a gas-liquid contact region in which the gas composition and a water-absorbing coolant are supplied from opposite directions and brought into countercurrent contact, and has a first separation unit that separates the gas composition into a gas component (A) containing ethylene and propylene and a liquid component (B) containing water, an organic compound and a water-absorbing coolant by countercurrent contact, and has a first return path that returns at least a portion of the liquid component (B) to an intermediate flow region between the upstream end and the downstream end in the flow direction of the water-absorbing coolant in the gas-liquid contact region, and a first cooling unit is interposed in the first return path to cool the returned liquid component (B).

A system including an absorption column configured to receive an acetylene-rich gas stream flowing upwards and a cooled acetylene-lean solvent stream flowing downwards to generate an acetylene-lean gas effluent and an acetylene-rich solvent effluent, one or more heat exchangers for receiving the acetylene-rich solvent effluent, the one or more heat exchangers being configured to transfer heat to the acetylene-rich solvent effluent to generate a heated acetylene-rich solvent stream, and one or more hydrogenation reactors each having one or more catalyst beds, wherein at least a first one of the one or more hydrogenation reactors is configured to convert at least a portion of acetylene in the heated acetylene-rich solvent stream to ethylene in the presence of a first hydrogenation catalyst and hydrogen under first hydrogenation reaction conditions to generate a first hydrogenation effluent including ethylene and a first acetylene-lean solvent effluent.

A process, a system, and an apparatus are provided for converting a lower alkane to an alkene. Oxygen and the lower alkane are provided to an ODH reactor to convert at least a portion of the lower alkane to an alkene. An ODH stream comprising the alkene, an oxygenate, steam, and a carbon-based oxide is produced. The bulk of the oxygenate is removed from the ODH outlet stream by non-dilutive cooling, with residual oxygenate being removed using dilutive quenching with a carbonate. Subsequently, separation of the carbon-based oxide from the alkene is achieved using a caustic tower, which also produces spent caustic in the form of a carbonate, which is then used as the carbonate for dilutive quenching. Dilutive quenching using a carbonate allows conversion of the oxygenate to an acetate, which can then be used to simplify separation of the oxygenate from water.

A method for preparing a hydrocarbon stream for oligomerization is provided. The method uses a stripping column to strip dimethyl ether from an olefin stream. Lighter olefins, such as C3-olefins, are also removed. The C4+ olefins can then be sent for further processing, including selective hydrogenation followed by oligomerization.

A method for dehydrating isopropanol to propylene, comprising a step of producing a propylene-containing product by dehydrating a raw material containing isopropanol in the presence of a dehydration catalyst containing aluminum oxide, wherein the raw material has a water content of 0.1 to 10.0 mass% (the total mass of the raw materials is taken as 100 mass%) and the sum of the content of C2 unsaturated impurities and the content of C3-C4 unsaturated impurities is 80 ppm or less (the total mass of the product is taken as 100 mass%).

The invention discloses an acetylene purification device and an acetylene purification method. The acetylene purification device comprises an absorption mechanism, a first desorption mechanism, a second desorption mechanism, a third desorption mechanism and an adsorption mechanism, the absorption mechanism is internally provided with an absorption cavity used for containing absorption liquid, the absorption mechanism further comprises an acetylene raw material feeding pipe and a cooler used for cooling the absorption liquid in the absorption cavity, and the gas outlet end of the acetylene raw material feeding pipe is inserted into the absorption liquid in the absorption cavity. According to the acetylene purification device disclosed by the invention, an original single desorption tower is divided into three stages of desorption mechanisms, so that not only can 4N-stage acetylene be obtained, but also impurities in the absorption liquid can be removed, the recycling times of the absorption liquid can be prolonged, and the production cost can be reduced. The purification cost is reduced and the purification efficiency is prolonged.

Processes for recovering hydrogen and hydrocarbons from a process stream are described. The processes incorporate a membrane separation unit to reject hydrogen preferentially from the net gas and recover the C3+ hydrocarbons from the hydrogen depleted retentate stream from the membrane unit using a retentate absorber. The invention eliminates the need for a large tail gas compressor package, while still achieving the target C3+ recovery of 85-90% or more with a smaller refrigeration package in the net gas section and membrane and retentate absorber equipment. It does not require any additional compressors, resulting in a significant reduction in plot space and power consumption.

The present invention relates to a process for recycling a solid rubber-based material, a recycling unit for carrying out said process. The present invention further relates to a process a process for manufacturing a solid rubber-based material, preferably a tire, using a product obtainable or obtained by the aforementioned process and a recycling process for preparing a pyrolysis oil from a solid rubber-based material obtained from the aforementioned process.

A system including an absorption column configured to receive an acetylene-rich gas stream flowing upwards and a cooled acetylene-lean solvent stream flowing downwards to generate an acetylene-lean gas effluent and an acetylene-rich solvent effluent, one or more heat exchangers for receiving the acetylene-rich solvent effluent, the one or more heat exchangers being configured to transfer heat to the acetylene-rich solvent effluent to generate a heated acetylene- rich solvent stream, and one or more hydrogenation reactors each having one or more catalyst beds, wherein at least a first one of the one or more hydrogenation reactors is configured to convert at least a portion of acetylene in the heated acetylene-rich solvent stream to ethylene in the presence of a first hydrogenation catalyst and hydrogen under first hydrogenation reaction conditions to generate a first hydrogenation effluent including ethylene and a first acetylene-lean solvent effluent.

A method for preparing an olefin stream for oligomerization includes fractionating an olefin stream to provide a light gas stream and an olefin-enriched stream, which is selectively hydrogenated to convert diolefins to monoolefins to provide a monoolefin stream, and oligomerizing the monoolefin stream over an oligomerization catalyst to provide an oligomerized stream.

The disclosure provides a method of purifying a linear alpha olefin product that includes feeding a linear alpha olefin feed stream comprising the linear alpha olefin product and ethylene into a feed stage of a distillation column, the distillation column having a plurality of stacked stages positioned between an overhead outlet and a bottoms reboiler including a stripping section and a rectifying section; feeding an aliphatic paraffin hydrocarbon solvent to the rectifying section of the distillation column to absorb linear alpha olefin; adding heat to at least one of said plurality of stacked stages in the stripping section of the distillation column between the feed stage and the bottoms reboiler; withdrawing an overhead stream comprising ethylene from the overhead outlet; and withdrawing a bottoms stream from the distillation column comprising the linear alpha olefin product.

The present invention relates to a zeolite adsorbent agglomerate comprising at least one zeolite of the faujasite type containing barium and / or potassium, wherein the particle porosity is between 25% and 45% and the standard deviation σ of the crystal size distribution in the agglomerate is less than 0.30 μm. The present invention also relates to the use of the zeolite adsorbent agglomerate in the separation of hydrocarbon mixtures and to a method for separating hydrocarbon mixtures using the zeolite adsorbent agglomerate.

The invention relates to the technical field of plasma cracking of methane, discloses a system and a method for extracting acetylene from reaction gas of plasma cracking of methane, and aims at a complex reaction gas system which is low in acetylene concentration and contains a large amount of hydrogen, water vapor and nanoscale carbon black particles. The method sequentially comprises the steps of reaction gas pretreatment, safe compression and purification and gas separation based on solvent absorption and desorption. The product quality is accurately controlled through flow setting, interference of light and heavy components is effectively avoided, and an acetylene product with the purity larger than or equal to 99% is obtained; water spraying cooling and washing are innovatively integrated in the compression process, and inhibition of acetylene decomposition, removal of residual nano carbon black and safe pressure boosting are synchronously realized; high-temperature waste heat of pyrolysis gas is recycled for driving solvent regeneration, and closed-loop treatment and recycling of carbon black water are achieved. The invention provides a set of complete, efficient and intrinsically safe engineering solution, and successfully breaks through the key separation and purification bottleneck of industrial application of the plasma cracking methane technology.

A method for producing acetylene and synthesis gas by partial oxidation comprises: in a reactor device (2), generating a quenched cracked gas (CG) comprising acetylene and further gas components, and collecting process water (PW) in the reactor device (2); performing a cooling process on the cracked gas (CG) for cooling the acetylene and the further gas components with an input coolant liquid, said cooling process being deployed in a cooling column (3); collecting heated coolant liquid from a sump (35) of the cooling column (3); performing a heat transfer process (HT) for transferring heat from the collected heated coolant liquid into a steam reservoir (6) thereby generating chilled coolant liquid, and / or performing a heat transfer process (HT) for transferring heat from the collected process liquid (PW); processing the generated chilled coolant liquid for generating input coolant liquid for the cooling column (3); and washing and stripping the cracked gas for obtaining acetylene.

A system including an absorption column configured to receive an acetylene-rich gas stream flowing upwards and a cooled acetylene-lean solvent stream flowing downwards to generate an acetylene-lean gas effluent and an acetylene-rich solvent effluent, one or more heat exchangers for receiving the acetylene-rich solvent effluent, the one or more heat exchangers being configured to transfer heat to the acetylene-rich solvent effluent to generate a heated acetylene- rich solvent stream, and one or more hydrogenation reactors each having one or more catalyst beds, wherein at least a first one of the one or more hydrogenation reactors is configured to convert at least a portion of acetylene in the heated acetylene-rich solvent stream to ethylene in the presence of a first hydrogenation catalyst and hydrogen under first hydrogenation reaction conditions to generate a first hydrogenation effluent including ethylene and a first acetylene-lean solvent effluent.

The present invention provides a method for producing isopropyl alcohol, comprising the steps of: cooling a reaction product and supplying the cooled reaction product to an absorption tower; and supplying a bottom discharge stream from the absorption tower containing isopropyl alcohol from the absorption tower to an isopropyl alcohol purification section including first to fourth columns, and supplying an upper discharge stream from the absorption tower containing propylene to a gas purification section including fifth and sixth columns, wherein all or a portion of the reaction product is cooled by heat exchange with one or more of the bottom discharge stream from the fourth column and the side discharge stream from the fifth column, the upper discharge stream from the second column is heat exchanged with the bottom discharge stream from the sixth column, and the upper discharge stream from the third column is heat exchanged with one or more of the bottom discharge stream from the first column and the bottom discharge stream from the second column.

A salt ion membrane may be paired with an absorption device to provide advantaged separation processes comprising: introducing a first aqueous salt stream and a mixed feed stream comprising at least one olefin and at least one paraffin to a salt ion membrane under conditions effective to form at least two phases; obtaining an olefin-rich permeate stream and an olefin-lean retentate stream from the salt ion membrane, in which the olefin-rich permeate stream and / or the olefin-lean retentate stream further comprises a salt ion membrane aqueous salt phase; introducing at least a portion of the olefin-lean retentate stream and a second aqueous salt stream to an absorption device under conditions effective to promote olefin extraction; obtaining an olefin-rich aqueous salt stream from the absorption device; and providing at least a portion of the olefin-rich aqueous salt stream as at least a portion of the first aqueous salt stream.

As a hydrocarbon production system that synthesizes hydrocarbons using water and carbon dioxide as raw materials, a hydrocarbon production system capable of producing hydrocarbons by securing hydrogen and carbon monoxide required for hydrocarbon synthesis is provided. In a hydrocarbon production system that produces hydrocarbons from at least water and carbon dioxide, the hydrocarbon production system includes at least an electrolytic reaction unit, a reverse water-gas shift reaction unit, and a hydrocarbon synthesis reaction unit.

The invention belongs to the technical field of refinery dry gas treatment, and discloses a method and a system for preparing hydrogen for a fuel cell by refinery dry gas C2 recovery coupling, the method comprises the following steps: 1) deoxidizing; 2) compressing; 3) cooling; 4) absorption: feeding the cooled refinery dry gas into an absorption tower to obtain a tower kettle material flow and tower top tail gas; 5) desorption: the tower kettle material flow of the absorption tower enters a desorption tower, and the recovered C2 concentrated gas is obtained at the top of the tower; 6) reabsorption: enabling the tail gas at the top of the absorption tower to enter a reabsorption tower to obtain tower kettle material flow and methane hydrogen tail gas at the top of the tower; 7) stabilizing; and 8) performing vacuum pressure swing adsorption or membrane separation and pressure swing adsorption to obtain the hydrogen for the fuel cell. According to the method, the absorption temperature is high, ethylene and propylene refrigeration compressors and expansion machines are not needed, the energy consumption is low, the investment is small, and the operation is simple; and C2 and hydrogen resources in the refinery dry gas are effectively recovered.

The present invention concerns a process for manufacture of C6−C8 aromatic hydrocarbons from pre-sorted fractions from end-of-life vehicles (first feedstock) using at least one gasifier. Said first feedstock F1 and a second feedstock are converted in at least one gasifier into a first raw synthesis gas RSG1, wherein said first raw synthesis gas RSG1 comprises CO, H2, and C6−C8 aromatic hydrocarbons. Next, said C6−C8 aromatic hydrocarbons are removed from said first raw synthesis gas RSG1 by a gas cleaning process GC in a gas cleaning unit GCU, whereby a clean first synthesis gas CSG1 and a first liquid residue LR1 are formed. Next, an aromatic stream AS and a second liquid stream LR2 are removed from said first liquid residue LR1 in an aromatic hydrocarbon extraction unit AEU, wherein said aromatic stream AS is enriched in C6−C8 aromatic hydrocarbons and wherein said second liquid stream LR2 is depleted in C6−C8 aromatic hydrocarbons.