Abstract: A method comprising receiving a hydrocarbon feed stream, separating the hydrocarbon feed stream into a heavy hydrocarbon rich stream and a carbon dioxide recycle stream, separating the carbon dioxide recycle stream into a natural gas liquids (NGL) rich stream and a purified carbon dioxide recycle stream, and injecting the purified carbon dioxide recycle stream into a subterranean formation. Included is a method comprising selecting a first recovery rate for a NGL recovery process, estimating the economics of the NGL recovery process based on the first recovery rate, selecting a second recovery rate that is different from the first recovery rate, estimating the economics of the NGL recovery process based on the second recovery rate, and selecting the first recovery rate for the NGL recovery process when the estimate based on the first recovery rate is more desirable than the estimate based on the second recovery rate.

Abstract: One exemplary embodiment can be a process. The process can include contacting one or more contaminated hydrocarbons with a hydrogen gas stream in a flash feed separator to generate a first liquid stream, stripping the first liquid stream to generate a residue stream, and separating the residue stream in a film generating evaporator to obtain a recovered distillate.

Abstract: Processes for maximizing high-value aromatics production utilizing stabilized crude benzene withdrawal are provided. Aromatic reactor effluent comprising a C5? fraction and a C6 to C10 fraction is separated into a benzene-rich stream and liquid and vapor streams depleted in benzene, one of the liquid streams depleted in benzene being a benzene-depleted C6? fraction. At least a portion of the C5? fraction from the benzene-rich stream is removed.

Abstract: Disclosed is a process for separating an acidic contaminant and light hydrocarbon of a light hydrocarbon feed having a large contaminating acidic contaminant content. Among other features, the process uses a combination of distillation and membrane separation arranged in a unique way to yield a high-purity light hydrocarbon product and a high-purity acidic contaminant product.

Abstract: A process is provided for recovering methane from landfill feed gas and other anaerobic digestors. The process comprising the following steps: firstly treating the feed gas to remove H2S; subsequently compressing the gas; and then treating the gas to remove further impurities. Additionally, there is provided a chiller for reducing the temperature of a gas flow. The chiller comprising: a shell arranged to be chilled, a plurality of bores through the shell and through which the gas flows, in use, and forming, together with the shell, a heat exchanger, a tangential inlet to each bore for creating a spiral flow of the gas through the bore, in use. Furthermore, a process is provided for purifying a gas feed using a reversible gas absorber unit comprising two hollow fiber gas/liquid contactors, each of which is arranged to provide a counter-current flow.

Abstract: The application relates to a process for the removal of hydrogen sulfide from a gas stream by catalytic direct oxidation without employing the combustion step of a Claus process. The process is particularly suitable for desulfurization of gas streams that contain hydrogen and allows sulfur recovery efficiency of better than 99%.

Abstract: A method of processing feed streams high in hydrogen sulfide is provided. The method includes providing a feed gas stream that includes hydrocarbons and at least 5 vol % hydrogen sulfide. At least a portion of the feed gas stream is separated into a hydrogen sulfide stream and a hydrocarbon stream. The hydrocarbon gas stream is processed to produce natural gas. At least 34 mol. % of the hydrogen sulfide in the hydrogen sulfide stream is combusted with an oxidant to generate thermal power. Thermal power generated by the combustion is utilized in one or more of the steps of separating the feed gas stream into the hydrogen sulfide stream and the hydrocarbon gas stream, and processing the hydrocarbon gas stream to produce natural gas, compressed natural gas, or liquefied natural gas.

Abstract: The present invention relates to a method for the separation of C4 olefins and C4 paraffins from a C4 hydrocarbon mixed gas including butene-1, trans-2- butene, cis-2-butene, normal butane, isobutane, etc. The method of the present invention produces C4 olefins with high purity by introducing a gaseous C4 mixture into the adsorption tower loaded with adsorbent selectively adsorbing olefins to adsorb C4 olefins and to discharge C4 paraffins to the outlet of the tower, desorbing C4 olefins adsorbed on the adsorption tower with a desorbent C5 hydrocarbon, C6 hydrocarbon, etc.), and then separating the C4 olefin and the desorbent by a distillation process.

Abstract: A method for separating an organic component from a mixture containing the organic component, water, and a microorganism, the method comprising (a) subjecting the mixture to a first separation step under mild conditions in order to generate a first stream containing water and organic component, and a second stream containing water and microorganism; and (b) subjecting the first stream to a second separation step under conditions which result in separation of the organic component from the water. The method allows for the organic component to be separated from the water under relatively severe conditions, due to the prior removal of the microorganism, and thus makes it possible to recycle the undamaged microorganism. The organic component may comprise a microbial oil which is suitable for use as, or conversion to, a biofuel.

Abstract: A system and process for acetylene selective hydrogenation of an ethylene rich gas stream. An ethylene rich gas supply comprising at least H2S, CO2, CO, and acetylene is directed to a first treatment unit for removing H2S and optionally CO2 from the gas stream. A CO oxidation reactor is used to convert CO to CO2 and form a CO-depleted gas stream. A second treatment unit removes the CO2 from the CO-depleted gas stream and an acetylene selective hydrogenation treats the CO-depleted gas stream.

Abstract: The present invention relates to a hybrid process comprising an adsorption process and a distillation process for the separation of butene-1 from a C4 hydrocarbon mixture gas including butene-1, trans-2-butene, cis-2-butene, normal butane, isobutane, etc. The above hybrid process comprises introducing a gaseous C4 mixture into the adsorption tower loaded with adsorbents which adsorb olefins selectively to discharge C4 paraffins to the outlet of the tower, desorbing C4 olefins selectively adsorbed in the adsorption tower to produce high purity C4 olefins mixture gas in which isobutane and normal butane was removed, and separating the high C4 olefins mixture gas (a mixture of butene-1, trans-2-butene, cis-2-butene, and a trace amount of C4 paraffins) via distillation to obtain high purity butene-1 including a trace amount of isobutane in the top of the distillation tower and obtain a mixture gas including trans-2-butene, cis-2-butene and a trace amount of normal butane in the bottom of the tower.

Abstract: The invention is a method for processing a mixture containing water, 3-methyl-1-butane and at least one other methylbutene. The method comprises primary distillation of the mixture, giving a gaseous primary overhead product containing methylbutene and water and a water-free primary bottom product containing 3-methyl-1-butene; condensation of the gaseous primary overhead product so as to give a condensate comprising a liquid aqueous phase and a liquid organic phase; separation of the condensate into a liquid aqueous phase and a liquid organic phase; discharge of the liquid aqueous phase; recirculation of the organic phase to the primary distillation; and finally secondary distillation of the water-free primary bottom product from the primary distillation so as to give a secondary overhead product comprising 3-methyl-1-butene and a secondary bottom product. The secondary overhead product obtained has a purity which enables it to be used directly as monomer or comonomer for preparing polymers or copolymers.

Abstract: A method for producing a substantially desulfurized a hydrocarbon fuel stream at temperatures less than 100° C. The method includes providing a nondesulfurized fuel cell hydrocarbon fuel stream that may include water and passing the fuel stream sequentially through a zeolite Y adsorbent and a selective sulfur adsorbent. The zeolite Y adsorbent may be exchanged with copper ions. The method produces a substantially desulfurized hydrocarbon fuel stream containing less than 50 ppb sulfur.

Abstract: A gas expansion cooling method for reducing hydrocarbon emissions includes feeding a high pressure cooling gas through a valve, decreasing a temperature of the cooling gas by decreasing its pressure; feeding the cooling gas into a heat exchanger; and diverting a hydrocarbon gas into the heat exchanger such that the cooling gas decreases a temperature of the hydrocarbon gas. The cooling gas may be drawn from a preexisting high pressure gas system that serves a purpose other than supplying a coolant for the gas expansion cooling system. A portion of the hydrocarbon gas may be condensed in the heat exchanger to form a hydrocarbon liquid, which may be separated from the hydrocarbon gas in a separation vessel. The hydrocarbon liquid may be recovered, while the hydrocarbon gas may be fed to a ventilation system.

Abstract: A method for producing high purity biomethane using two non-regenerative media in series to reliably and virtually completely eliminate undesirable impurities from biomethane. The first media in the series is activated carbon, preferably virgin media, produced from coconut shells or coal. The second media in the series is silica gel or other desiccant. Neither material is regenerated; rather, the purity of the biomethane is monitored and when the media is spent, the media is discarded.

Abstract: Disclosed is a method relating to hydrocarbon production by gasification of carbonaceous material, for example, a two-stage gas washing method as a part of gas refining. Disclosed is a method for hydrogen sulfide and carbon dioxide removal from synthesis gas produced by gasification. Disclosed is a use of a combination of two chemical wash approaches. The process can be utilized as a part of biomass to liquid (BTL) process.

Abstract: A system and method for processing biomass into hydrocarbon fuels that includes processing a biomass in a hydropyrolysis reactor resulting in hydrocarbon fuels and a process vapor stream and cooling the process vapor stream to a condensation temperature resulting in an aqueous stream. The aqueous stream is sent to a catalytic reactor where it is oxidized to obtain a product stream containing ammonia and ammonium sulfate. A resulting cooled product vapor stream includes non-condensable process vapors comprising H2, CH4, CO, CO2, ammonia and hydrogen sulfide.

Abstract: The invention is a process and apparatus for separating the components of a multi-component gas stream comprising light and heavier volatility components with a variable composition. The process includes contacting the multi-component gas stream with a lean solvent in an absorber to produce a light component overhead stream and a rich solvent bottoms stream, flashing the rich solvent bottoms stream in at least a first, second and third reduced constant pressure of sequentially lower pressure wherein the released gas is compressed and a part is routed back to the absorber bottoms as stripping gas and a part is routed as a part of the heavier product stream. In this invention compressed vapor from the first or second reduced constant pressure rich solvent flash vessel is split by flow control between recycle routing to the absorber bottom stage as stripping gas and to the heavier product hydrocarbon stream, depending on the feed gas concentration of light component.

Abstract: This invention pertains to separating an olefin stream into at least two olefin streams. The olefin stream that is to be separated is low in diene composition, which allows the olefin stream to be compressed at a relatively high temperature without causing fouling problems in the compressor system. The invention is particularly relevant to separating olefins obtained from an oxygen to olefins unit.

Abstract: The present invention provides a method and reactor system for hydrogenating acetylenes present in the olefin stream derived from the following streams, alone or in combination: petroleum catalytic cracking process and/or oxygenate-to-olefin reactor, such as methanol-to-olefin (MTO) reactor, in an olefin production plant before the distillation steps, wherein the acetylene hydrogenation occurs before or just after the acid gas removal step.

Abstract: A method of purifying a vapour product stream obtained from cracking of biomass catalysed by a fluidised solid catalyst is provided. The catalyst is separated from the vapour product stream to provide a de-catalysed vapour product stream. Solid biomass residue is cyclonically separated from the de-catalysed vapour product stream to provide a purified vapour product stream.

Abstract: The invention comprises an absorption heat pump to supply energy to a distillation process or an outside process. The streams used to effect the absorption heat pump are to be combined in any case as a feedstream to a conversion process, and energy thus is conserved by avoiding the necessity of reseparating the streams.

Abstract: A process is presented for the selective separation and recovery of large normal paraffins from a heavy kerosene boiling point fraction. The process includes passing the heavy kerosene fraction through an adsorption separation system for separating the normal paraffins from the paraffin mixture. The recovered extract and raffinate streams are mixed with a diluent made up of a lighter hydrocarbon. The subsequent diluted extract and raffinate streams are passed through first fractionation columns to separate the desorbent from the diluent and the heavier paraffins. The mixture of the diluent and heavier paraffins is passed through a second set of fractionation columns to separate the diluent and the heavier paraffins.

Abstract: A process for component separation in a polymer production system, comprising separating a polymerization product stream into a gas stream and a polymer stream, wherein the gas stream comprises ethane and unreacted ethylene, distilling the gas stream into a light hydrocarbon stream, wherein the light hydrocarbon stream comprises ethane and unreacted ethylene, contacting the light hydrocarbon stream with an absorption solvent system, wherein at least a portion of the unreacted ethylene from the light hydrocarbon stream is absorbed by the absorption solvent system, and recovering a waste gas stream from the absorption solvent system, wherein the waste gas stream comprises ethane, hydrogen, or combinations thereof.

Abstract: The invention relates to a process for workup of a stream (1) comprising butene and/or butadiene, butane, hydrogen and/or nitrogen and carbon dioxide, comprising: (a) absorption of stream (1) with a mixture (5) comprising 80 to 97% by weight of N-methylpyrrolidone and 3 to 20% by weight of water to obtain a stream (9) comprising N-methylpyrrolidone, water, butene and/or butadiene, butane, and optionally carbon dioxide, and a stream (7) comprising hydrogen and/or nitrogen and butane, (b) extractive distillation of stream (9) with a stream (13) comprising 80 to 97% by weight of N-methylpyrrolidone and 3 to 20% by weight of water to separate the stream (9) into a stream (17) comprising N-methylpyrrolidone, water, butene and/or butadiene, and a stream (15) comprising essentially butane, and optionally carbon dioxide, (c) distillation of stream (17) into a stream (23) comprising essentially N-methylpyrrolidone and water, and a stream (21) comprising butene and/or butadiene.

Abstract: A process and an apparatus for separating and recovering waste alkali from a cyclohexane oxidation solution are provided. A gradient combination of the gravity separation technique, the vortex separation technique and the coalescence separation technique is used to carry out fine separation of the waste alkali liquor from the cyclohexane oxidation solution. The purified cyclohexane oxidation solution is fed into a down-stream apparatus. Most of the waste alkali liquor thus separated is recycled, while the remaining is expelled. The expelled waste alkali liquor is incinerated in an incinerator, followed by recovering the molten species using a pneumatic pulverization process.

Abstract: A method for the solvent extraction of 1,3-butadiene from a mixture of C4 hydrocarbons that employs a distillation tower to produce the desired 1,3-butadiene product as an overhead and a separate bottoms stream that is removed from and not recycled in the solvent extraction process.

Abstract: A process is disclosed for enhanced recovery of propylene and LPG from the fuel gas produced in Fluid catalytic cracking unit by contacting a heavier hydrocarbon feed with FCC catalyst. In the conventional process, the product mixture from FCC main column overhead comprising naphtha, LPG and fuel gas, are first condensed and gravity separated to produce unstabilized naphtha, which is subsequently used in the absorber to absorb propylene and LPG from fuel gas. However, the recovery of propylene beyond 97 wt % is difficult in this process since unstabilized naphtha already contains propylene of 5 mol % or above. In the present invention, C4 and lighter components from unstabilized naphtha are first stripped off in a separate column to obtain a liquid fraction almost free from propylene (<0.1 mol %) and other LPG components. Such a stripped liquid fraction, after cooling to 20° C. to 30° C.

Abstract: Disclosed is a process for integrating a butene dimerization process with a metathesis process to remove isobutene from the feed stream to the metathesis reactor. The isobutene is preferentially dimerized in the dimerization process to leave n-butenes for metathesis with ethylene. An upstream selective hydrogenation process also isomerizes 1-butenes to 2-butenes which is the preferred butene reagent in the metathesis process. A common fractionator column for the dimerization and hydrogenation processes is also described.

Abstract: Process for the production of ethylene for chemical use starting with a hydrocarbon source according to which: a) the hydrocarbon source is subjected to a first cracking step, namely a pyrolysis step carried out in a cracking oven, thus producing a mixture of cracking products; b) the mixture of cracking products is subjected to a succession of treatment steps, including a compression step, which makes it possible to obtain a purified crude gas stream; c) the purified crude gas stream is then cooled to a temperature where hydrocarbons with 6 and more carbon atoms condense so that they can be removed from the purified crude gas stream; d) the resulting purified gas stream is afterwards supplied to one separating column, where a fraction A containing hydrogen, methane and ethylene is separated at the head of the column and a heavy fraction C is separated at the bottom of the column; e) a part of the reflux of this column is supplied to a refrigeration cycle leading to a fraction B enriched with ethylene; and f)

Abstract: A process for the recovery of organic chemical feedstocks from biooil is presented. The process comprises separating the water soluble chemicals from biomass and recovering the primarily oxygenate compounds for use as feedstocks.

Abstract: Disclosed is a process for separating an acidic contaminant and light hydrocarbon of a light hydrocarbon feed having a large contaminating acidic contaminant content. Among other features, the process uses a combination of distillation and membrane separation arranged in a unique way to yield a high-purity light hydrocarbon product and a high-purity acidic contaminant product.

Abstract: The present invention relates to a method for purifying a compound selected from a compound represented by the following general formula [1] or [2], a saturated aliphatic hydrocarbon having no substituent, or kerosene: (R represents a halogen atom or a lower alkyl group having 1 to 3 carbon atoms, and n represents an integer of 1 to 5); (R is the same as above, p and q independently represent an integer of 0 to 4, with the proviso that at least one of p and q is not 0), comprising: removing a impurity contained in said compound by a first step comprising contacting said compound with ozone gas, and then a second step comprising contacting said compound with an adsorbent selected from zeolite or a basic adsorbent.

Abstract: LNG is pumped to supercritical pressure and vaporized, preferably in an offshore location to thereby form a natural gas stream with an intermediate temperature. A first portion of that stream is then processed in an onshore location to remove at least some non-methane components to thereby form a lean LNG, which is then combined with a second portion of that stream to form a sales gas having desired chemical composition. The intermediate temperature and the split ratio of the gas stream in first and second portion are a function of the concentration of the non-methane components in the LNG.

Abstract: An improved process for separating a hydrocarbon bearing feed gas containing methane and lighter, C2 (ethylene and/or ethane), and heavier components into a fraction containing predominantly methane and lighter components and a fraction containing predominantly C2 and heavier hydrocarbon components including the steps of cooling and partially condensing and delivering the feed stream to a separator to provide a first residue vapor and a first liquid containing C2, directing a first part of the first liquid containing C2 into a heavy-ends fractionation column wherein the liquid is separated into a second hydrocarbon bearing vapor residue and a second liquid product containing C2; further cooling the second part of the first liquid containing C2 and partially condensing the second hydrocarbon bearing vapor residue; combining the cooled second part of the first liquid and partially condensed second hydrocarbon-bearing vapor residue and directing them to a second separator effecting a third residue and a third li

Abstract: A method of treating a hydrocarbon stream such as natural gas comprising at least the steps of: (a) providing a hydrocarbon feed stream (10); (b) passing the feed stream (10) through a first separation vessel (12) to provide a first gaseous stream (20) and a first liquid stream (30); (c) passing the first gaseous stream (20) from step (b) through a high pressure separation vessel (14) to provide a second gaseous stream (40) and a second liquid stream (80); (d) maintaining the pressure of the first gaseous stream (20) between step (b) and step (c) within +10 bar; (e) passing the first liquid stream (30) of step (b) through a stabilizer column (16) to provide a third gaseous stream (60) and a stabilized condensate (70); and (f) feeding the second liquid stream (80) from step (c) into the stabilizer column (16).

Abstract: Apparatuses and systems for removing heavy hydrocarbons from a solvent stream are disclosed herein. The apparatuses extract heavy hydrocarbons into light hydrocarbons and provide a solvent stream having the heavy hydrocarbons removed. Two water washing steps are used to remove residual solvent from the heavy hydrocarbon solution in light hydrocarbons. In some embodiments, the second water wash is used for processing subsequent batches of the solvent stream. The heavy hydrocarbons and solvent can be recovered and processed further. Methods for removing heavy hydrocarbons from a solvent stream are also disclosed herein.

Abstract: The invention is directed to a process for producing polyolefins by one or more homogeneous or colloidal polymerization catalyst wherein residual catalyst is removed by using a solid sorbent.

Abstract: A supercritical fluid polymer depolymerization machine is disclosed herein, which machine is capable of converting a wide range of biomass and/or waste plastic materials into a plurality of reaction products (liquid and gaseous) including fermentable sugars, hydrocarbons, and various aromatic substances that, in turn, are readily convertible into liquid transportation fuel known as “neodiesel.

Abstract: Process for removing oxygen-containing organic compounds from mixtures of hydrocarbon compounds, in which a liquid phase (1) containing hydrocarbons and oxygenates is charged to a first column (3), a light fraction is separated as top product (5) by distillation, and that a heavier C4+ fraction is removed from the bottom, the light fraction (5) and a gaseous mixture of hydrocarbons and oxygenates (2) is charged to a second column (7), and separated into a light and a heavy hydrocarbon fraction distillation, and an additional solvent (6) is supplied to the upper part of the second column (7), which dissolves the oxygenates and, the solvent and oxygenates being discharged as bottom product (9) and a hydrocarbon product (8), which is free from oxygenates leaves the top of the column (7). The solvent optionally is wholly or partly regenerated and recirculated to the extractive distillation column.

Abstract: Processes and systems for removing contaminants from a paraffin containing feedstock are provided that include: providing a paraffin containing feedstock, passing the paraffin containing feedstock to an inlet of a guard bed that includes an adsorbent material, and contacting the paraffin containing feedstock with the adsorbent material in the guard bed to produce a treated paraffin containing feedstock. The processes and systems can also include removing the treated paraffin containing feedstock from an outlet of the guard bed, and passing the treated paraffin containing feedstock to a paraffin separation zone that separates normal paraffins from the treated paraffin containing feedstock.

Abstract: Contemplated configurations and methods employ COS hydrolysis and a downstream H2S removal unit to produce a treated feed gas that is then further desulfurized in an absorber using two lean oil fluids. The so produced mercaptan enriched hydrocarbon fluid is fed to a distillation column that produces a light overhead vapor that is preferably combined with the treated feed gas and a sulfur rich bottom product that is in most cases preferably directly fed to a hydrocarbon processing unit comprising a hydrotreater. In further especially preferred aspects, the hydrocarbon processing unit produces at least one and more typically both of the two lean oil fluids, and the treated gas is optionally further processed to produce clean fuel gas in a hydrotreater for olefinic saturation and sulfur conversion using a lean oil recycle for reactor temperature control.

Abstract: An improved process for the production of olefins, and in particular for separation of olefins produced by a dehydrogenation process from paraffin feed stocks, is provided. A high pressure product splitter is used to separate olefins produced in a dehydrogenation plant from residual paraffin feed stocks. The use of a high pressure splitter to separate olefin products from paraffin feed stocks allows for recovery of a high purity olefin product with lower energy consumption compared to prior art processes. The process is particularly suited to separation of propylene from propane.

Abstract: A process for the deep desulfurisation of hydrocarbons (HC), in particular Natural Gas Condensate (NGC), and HC comprising diesel, pre-extracted diesel and naphtha, is described which is capable of reducing the sulfur content of these HC from 500 to 30 ppm. The process comprises contacting the hydrocarbon material with an oxidant selected from organic peroxy acids, organic peroxides, inorganic peroxides and mixtures thereof, in at least a stochiometric amount sufficient to oxidise a sulfur compound to a sulfone compound; contacting the hydrocarbon material with an aqueous extractant to allow at least a portion of the oxidised sulfur compounds to be extracted into the aqueous extractant, and separating the hydrocarbon material from the aqueous extractant to give a hydrocarbon material of reduced sulfur content. Optionally, the process may include a second and subsequent extractions with the aqueous extractant to further reduce sulfur content. A final extraction with an IL may be conducted.

Abstract: A process for fractionating isobutene from normal butenes, including: introducing hydrogen and a feed stream comprising isobutene, 1-butene, and 2-butene into a first column including a reaction zone containing a hydroisomerization catalyst operating at a first pressure and concurrently: (i) converting at least a portion of the 1-butene to 2-butene, and (ii) separating isobutene from the 2-butene; recovering a first overheads fraction comprising isobutene from the first column; recovering a first bottoms fraction comprising isobutene, 2-butene, and unreacted 1-butene from the first column; introducing the first bottoms fraction into a top portion of a second column comprising a fractionation column operating at a second pressure lower than the first pressure; separating the first bottoms into a second overheads fraction comprising isobutene and 1-butene and a second bottoms fraction comprising 2-butene; compressing the second overheads fraction; and introducing the compressed second overheads fraction to a lo

Abstract: Processing schemes and arrangements for the catalytic cracking of a heavy hydrocarbon feedstock and obtaining light olefins substantially free of carbon dioxide via amine treatment and employing fractionation processing are provided.

Abstract: A process is presented for the selective separation and recovery of large normal paraffins from a heavy kerosene boiling point fraction. The process includes passing the heavy kerosene fraction through an adsorption separation system for separating the normal paraffins from the paraffin mixture. The recovered extract and raffinate streams are mixed with a diluent made up of a lighter hydrocarbon. The subsequent diluted extract and raffinate streams are passed through first fractionation columns to separate the desorbent from the diluent and the heavier paraffins. The mixture of the diluent and heavier paraffins is passed through a second set of fractionation columns to separate the diluent and the heavier paraffins.

Abstract: To decrease capital costs of crack gas treatment of the olefin plant, a method for separation of olefins reduces the units for catalytic hydrogenation. In the method, olefins having three carbon atoms are separated from olefins having four carbon atoms. Crude gas is precompressed (1), precooled and dried (2), and passed into a C3/C4 separation stage (6) comprising a C4 absorber, operating at full crude gas pressure, and a depropanizer, operated at a pressure of 8 to 12 bar. In the C3/C4 separation stage, the olefins are separated into a fraction having at most three carbon atoms (C3?), and a fraction having at least four carbon atoms (C4+). The fraction having at most three carbon atoms is completely compressed (1) and passed to the catalytic hydrogenation (4); the fraction having at least four carbon atoms is passed out for further processing (7).

Abstract: An improved process for separating a hydrocarbon bearing feed gas containing methane and lighter, C2 (ethylene and/or ethane), and heavier components into a fraction containing predominantly methane and lighter components and a fraction containing predominantly C2 and heavier hydrocarbon components including the steps of cooling and partially condensing and delivering the feed stream to a separator to provide a first residue vapor and a first liquid containing C2, directing a first part of the first liquid containing C2 into a heavy-ends fractionation column wherein the liquid is separated into a second hydrocarbon bearing vapor residue and a second liquid product containing C2; further cooling the second part of the first liquid containing C2 and partially condensing the second hydrocarbon bearing vapor residue; combining the cooled second part of the first liquid and partially condensed second hydrocarbon-bearing vapor residue and directing them to a second separator effecting a third residue and a third li

Abstract: The invention relates to a process for preparing 1-butene from technical mixtures which comprise at least 1-butene, isobutene, n-butane and 2-butenes by partial conversion of the isobutene present, distillative removal of a fraction comprising 1-butene and isobutene, and conversion of the isobutene present therein to tert-butyl ethers.