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| Number | Title | Issue Date |
| 8173855 | Process for the production of low-concentration ethylene for chemical use 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 cracki... | 05/08/2012 |
| 8076526 | Extractive distillation of conjugated diene A process for isolating a conjugated diene from a hydrocarbon mixture is disclosed. The process comprises distilling the hydrocarbon mixture in the presence of an extraction solvent comprising an N,N-dialkyl aliphatic amide and from 12 to 50 weight percent furfural ... | 12/13/2011 |
| 8058498 | Device for removing oxygen-containing organic compounds from mixtures of various hydrocarbon compounds 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... | 11/15/2011 |
| 8013201 | High energy reduction in a propane dehydrogenation unit by utilizing a high pressure product splitter column 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 pl... | 09/06/2011 |
| 7956231 | Method for separation of olefins 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... | 06/07/2011 |
| 7923595 | Process for the treatment of a product stream Process for treating a product stream typically from an autothermal cracking process, the product stream comprising one or more olefins, hydrogen, carbon monoxide, carbon dioxide and one or more oxygenates, by contacting the product stream with at least one compound... | 04/12/2011 |
| 7897827 | Propylene recovery during regeneration of an oxygenate removal unit Processes and systems are disclosed that relate to the removal of impurities and separation the light olefins from an MTO product vapor stream. Specifically, the processes and systems relate to recovery of light olefins during regeneration of an adsorber in an oxyge... | 03/01/2011 |
| 7842847 | Separation process for olefin production Improved processes for the separation of olefins from paraffins, such as propylene from propane are provided. Two product splitters are used in parallel to separate propylene from propane. One of the product splitters operates at a lower pressure, while the second p... | 11/30/2010 |
| 7799964 | Membrane process for LPG recovery Liquefied Petroleum Gas (LPG) can be recovered from various streams using a multiple membrane recovery process producing hydrogen stream at high yield and high purity and a C3+ LPG stream at high yield with low energy expenditure. ... | 09/21/2010 |
| 7795488 | Process for the removal of oxygenates from a gaseous stream The present invention relates to a process for the removal of oxygenates from a gaseous stream also comprising carbon dioxide, said process comprising: a) providing a first gaseous stream comprising one or more mono-olefin(s), at least 100 ppm (by weight) of one or ... | 09/14/2010 |
| 7687677 | Process for recovering thermal energy from a reactor effluent stream A processing scheme and arrangement for enhanced olefin production involves recovering thermal energy from a reactor effluent stream resulting from the dehydrogenation of a dehydrogenatable hydrocarbon. The process involves contacting the reactor effluent stream wit... | 03/30/2010 |
| 7678958 | Method of removing dimethyl ether from an olefin stream This invention is directed to a method of removing dimethyl ether from an olefin stream. The method includes distilling the olefin stream so that the dimethyl ether is separated out of the olefin stream with propane. The olefin stream can then be further distilled t... | 03/16/2010 |
| 7572948 | Fulvene purification The present invention provides a method of removing undesired isomers, including substituted cyclopentadiene regioisomers, from the desired fulvene in a crude fulvene composition by selectively reacting the undesired isomers with pyrrolidine and 4-(N,N-dimethylamino... | 08/11/2009 |
| RE40752 | Diene removal from an olefin feedstock The invention pertains to a process of removing dienes from an olefin feedstock. A preferred olefin feedstock is for the production of primary alcohol compositions by skeletal isomerization of the olefins followed by hydroformylation. In this preferred embodiment, t... | 06/16/2009 |
| 7547814 | Separation of olefin vapor from liquid fraction to reduce fouling This invention is directed to methods of removing water and other condensable materials, as well as solids particles such as catalyst particles, from olefin product streams so as to reduce fouling in the liquid and vapor separation equipment. In order to reduce foul... | 06/16/2009 |
| 7528290 | Apparatuses and methods for separating butene-1 from a mixed C feed A process is disclosed for recovering 1-butene from a feed steam comprising n-butane, isobutane and butene isomers using a single, divided wall distillation column. The disclosed process includes introducing the feed steam into an inlet of a first side of a distilla... | 05/05/2009 |
| 7476775 | Method and system for separating an oligomerization reactor effluent A method of separating an oligomerization reactor effluent, comprising: flashing the oligomerization reactor effluent into a liquid portion and a vapor portion, distilling the liquid and the vapor portions of the oligomerization reactor effluent and recovering an ol... | 01/13/2009 |
| 7473815 | Process for removal of catalyst residues from poly-α-olefins A method is disclosed for reducing levels of residual halogen and Group IIIb metals in a crude poly(α-olefin) polymerized in the presence of a catalyst comprising the halogen and Group IIIb metals, wherein the method comprises: A)... | 01/06/2009 |
| 7439413 | Method for the production of isobutene from commericial methyl tert-butly ether The invention relates to a process for preparing high-purity isobutene from industrial methyl tert-butyl ether (MTBE) and the economical utilization of the secondary streams. ... | 10/21/2008 |
| 7437891 | Recovery and purification of ethylene A process for the recovery and purification of ethylene and optionally propylene from a stream containing lighter and heavier components that employs an ethylene distributor column and a partially thermally coupled distributed distillation system. ... | 10/21/2008 |
| 7429686 | Low pressure olefin recovery process A low-pressure olefins recovery process and plant are described. The feed gas is compressed and distilled at a primary distillation pressure. The overhead stream is chilled at a pressure less than 30 kg/cm2 (430 psia) to partially condense the overheads. The primary... | 09/30/2008 |
| 7411105 | Process and installation for the oligomerization of olefins that use a membrane separation This invention relates to a process for the oligomerization of olefins that have 2 to 6 carbon atoms comprising at least: a) One reaction stage in which a first effluent that comprises oligomers, paraffins and olefins that have not... | 08/12/2008 |
| 7411107 | Alkene separation process A process for the oxidation of a C2 to C4 alkane to produce the corresponding alkene and carboxylic acid which process comprises separation of the alkene from a mixture of the alkene, the alkane and oxygen by absorption in a metallic salt solut... | 08/12/2008 |
| 7402720 | Distillation process for removal of methyl acetylene and/or propadiene from an olefin stream The present invention provides a process for removing methyl acetylene and/or propadiene from a propylene stream and/or a butylene stream by two step fractionation. Methyl acetylene and/or propadiene avoids the use of a hydrogenation reactor and makes the methyl ace... | 07/22/2008 |
| 7399897 | Method of separating olefins from mixtures with paraffins A process for the separation or concentration of olefinic hydrocarbons from mixtures of olefinic and paraffinic hydrocarbons uses a polyimide membrane, The process is well suited to separating propylene from propylene/propane mixtures. The novel method the membrane ... | 07/15/2008 |
| 7393993 | Method for removal of acetylenes from hydrocarbon streams The process of the invention comprises contacting a hydrocarbon stream, comprising light olefins plus impurities such as acetylenes, in the absence of hydrogen with a supported copper catalyst, preferably CuO/alumina. The acetylene component undergoes a coupling rea... | 07/01/2008 |
| 7393992 | Method for working up crude 1,3-butadiene Sudstituted the abstract with a new abstract as follows: The invention relates to a continuous process for separation a mixture of hydrocarbons which has beenobtained by extractive distillation of C4 fraction useing a selective solvent and the hydrocarbon... | 07/01/2008 |
| 7388120 | Removing carbon dioxide from an oxygenate to olefins reaction effluent The present invention provides processes for removing CO2 from an effluent stream derived from an oxygenate to olefins reaction system. In one embodiment, the invention comprises contacting the effluent stream with a first CO2 removal medium in... | 06/17/2008 |
| 7388122 | Dewaxing aid The present invention relates to dewaxing aids comprising the mixture of two or more polyalkyl(meth)acrylates having an exothermic heat initiation temperature within the specific range when chilled at 30° C./minute rate, to be added together with the wax-containing... | 06/17/2008 |
| 7361800 | Process for the separation of olefins from paraffins using membranes Chitosan membranes chelated with silver or cuprous material may be used to separate olefins from a mixture of olefins and paraffins. The feed stream is humidified, demisted, treated to remove sulfur compounds and passed to a cell having a chitosan membrane containin... | 04/22/2008 |
| 7361799 | Process for producing olefins A process is described for producing olefins from a vapor product stream from an oxygenate to olefin conversion reaction, the vapor product stream comprising C2 to C4 olefins, C5+ hydrocarbons, at least one oxygenate and water. In th... | 04/22/2008 |
| 7357902 | Process for the removal of oxygen from olefin-containing process streams Process for the removal of oxygen from a gas mixture comprising oxygen, at least one olefin, hydrogen, carbon monoxide and optionally at least one alkyne, the ratio of oxygen:hydrogen in the gas mixture being 1 part by volume of oxygen to at least 5 parts by volume ... | 04/15/2008 |
| 7348466 | Solvent extraction In a method for the solvent extraction of butadiene from a mixture of hydrocarbons having four carbon atoms per molecule, which method inherently produces tars, the extraction process is operated with a tar loading level, relative to the solvent employed, of no more... | 03/25/2008 |
| 7335802 | Methods of preparing branched aliphatic alcohols Systems and methods to produced branched aliphatic alcohols are described. Systems may include a dehydrogenation-isomerization unit, an olefin dimerization unit, an olefin isomerization unit, a hydroformylation unit, a dehydrogenation unit, a hydrogenation unit and/... | 02/26/2008 |
| 7332639 | Process for producing olefins A process is described for producing an olefins stream from a first vapor effluent stream from an oxygenate to olefin conversion reaction, said first vapor effluent stream comprising C2 and C3 olefins, C4 hydrocarbons, and C2 | 02/19/2008 |
| 7329790 | Wet scrubbing and recycle of effluent-contaminating catalyst particles in an oxygenate-to-olefin process The economics of a catalytic process using a fluidized conversion zone and a relatively expensive catalyst for converting an oxygenate to light olefins are substantially improved by recovering and recycling effluent contaminating catalyst particles from the product ... | 02/12/2008 |
| 7326820 | System and method for purifying heptane Removing impurities from a heptane stream by contacting the heptane stream with an acidic catalyst, wherein the contacting reduces a concentration of one or more close boiling impurities, one or more olefins, or both. The impurities are isomerized via contact with t... | 02/05/2008 |
| 7326821 | Removal of oxygenate from an olefin stream This invention is to a process for removing dimethyl ether from an olefin stream. The process includes contacting the olefin stream with a molecular sieve that has improved capacity to adsorb the dimethyl ether from the olefin stream. The molecular sieve used to rem... | 02/05/2008 |
| 7323612 | Removal of condensable compounds from an olefin stream This invention is directed to a process for condensing and removing condensable compounds from an olefin stream containing light olefin compounds, and recovering the light olefin compounds. The process of the invention is particularly effective in removing water and... | 01/29/2008 |
| 7316127 | Hydrocarbon gas processing for rich gas streams A process for the recovery of ethane and heavier hydrocarbon components from a hydrocarbon feed gas stream. Feed gas stream is cooled into a first and second cooled streams. First and second cooled streams are sent to a cold absorber and separated into a first gas s... | 01/08/2008 |
