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7619126 |
Method for obtaining crude 1,3-butadiene from a C4 fraction
A process for recovering crude 1,3-butadiene from a C 4 fraction by extractive distillation using a selective solvent in a dividing wall column (TK) in which a dividing wall (T) is arranged in the...
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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...
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7554002 |
Method for cold supply to the low-temperature separation stage of an olefin plant
A method is described for refrigerant supply of a low-temperature separation stage in a plant for producing olefins from hydrocarbon-containing feed (olefin plant). During the separation sequence...
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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...
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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...
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7528290 |
Apparatuses and methods for separating butene-1 from a mixed C4 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...
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7527725 |
Upgrading drip oil
A method is disclosed for upgrading drip oil comprising subjecting the drip oil to multiple distillation steps to form a stream rich in aromatics and a separate stream rich in dicyclopentadiene.
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7501549 |
Benzene removal from FCC naphtha
An integrated process for the isolation of benzene contained within a fluid catalytically cracked naphtha is disclosed wherein a C 6 fraction containing a benzene concentrate is subjected to...
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7497896 |
Method of treating a gas mixture comprising propane and propylene
Methods for treating a gas mixture of at least propylene and propane, in order to separate the propylene from the propane. The gas mixture is brought into contact with a membrane enables the...
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7495141 |
Minimizing corrosion in a methanol-to-olefin effluent processing system
The present invention is directed toward reducing corrosion in a methanol-to-olefin (MTO) effluent processing system, and particularly in the condensate removal system thereof, by injecting a...
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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...
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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...
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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.
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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...
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7411107 |
Alkene separation process
A process for the oxidation of a C 2 to C 4 alkane to produce the corresponding alkene and carboxylic acid which process comprises separation of the alkene from a mixture of the alkene, the...
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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...
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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...
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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...
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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,...
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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...
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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...
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7388120 |
Removing carbon dioxide from an oxygenate to olefins reaction effluent
The present invention provides processes for removing CO 2 from an effluent stream derived from an oxygenate to olefins reaction system. In one embodiment, the invention comprises contacting the...
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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...
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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 C 2 to C 4 olefins, C 5 +...
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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...
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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...
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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...
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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...
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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...
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7314965 |
Catalysts containing copper and zinc for the purification of ethylene
Catalysts for the purification of ethylene containing copper and zinc, optionally one or more promoters or supports. These catalysts are produced by precipitation, drying, calcination and...
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7311813 |
Distillation sequence for the purification and recovery of hydrocarbons
This invention is an improved distillation sequence for the separation and purification of ethylene from a cracked gas. A hydrocarbon feed enters a C2 distributor column. The top of the C2...
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7304200 |
Method for separation of substances by extraction or by washing them with ionic liquids
The present invention relates to a process for the liquid-liquid extraction or liquid-gas extraction of mixtures of organic compounds, in which one or more components of the mixture are completely...
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7294749 |
Low pressure olefin recovery process
A low-pressure olefins recovery process and plant are described. The feed gas 300 is compressed 302, 304 and distilled 310 at a primary distillation pressure. The overhead stream 312 is...
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7273961 |
Quench process
The present invention is a process for quenching a reactor effluent stream. The reactor effluent stream comprises water, olefin product, and methanol and is further entrained with catalyst fines....
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7259288 |
Enhanced hydrogen recovery for hydroprocessing units
A process for the recovery of high purity hydrogen for recycling to a hydroprocessing or similar unit located in an integrated refinery facility includes sampling and providing analytical...
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7244873 |
Process and apparatus for separating oxygenate modifier from oligomerization effluent by water wash
It has now been disclosed that by directing the effluent from an oligomerization reactor to a water wash column to remove alcohol modifier from the hydrocarbon stream before sending it to a...
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7238848 |
Method for separating dimethyl ether from an olefin-containing product stream
A method for processing an olefin-containing product stream that contains dimethyl ether as a by-product is described. Such a product stream arises, for example, in the synthesis of olefin from...
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7214846 |
Recovery of ethylene and propylene from a methanol to olefin reaction system
The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane,...
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7138557 |
Selective dimethylether recovery and recycle in a methanol-to-olefin process
An improved methanol-to-olefin (MTO) product recovery scheme is provided which enables substantial reduction in the amount of light olefins that are undesirably captured in a dimethylether (DME)...
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7135604 |
Process for separating carbon dioxide from an oxygenate-to-olefin effluent stream
The present invention is a process for removal of carbon dioxide from a reactor effluent stream comprising water, carbon dioxide and olefin(s), where a portion of the carbon dioxide is removed in a...
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7132580 |
Selective dimethylether and methanol recovery and recycle in a methanol-to-olefin process
An improved methanol-to-olefin (MTO) product recovery scheme is provided which enables substantial reduction in the amount of light olefins that are undesirably captured in a dimethylether (DME)...
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7129387 |
Low capital implementation of distributed distillation in ethylene recovery
An apparatus for recovering ethylene from a hydrocarbon feed stream, where the apparatus is a single distillation column pressure shell encasing an upper region and a lower region. The upper region...
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7122494 |
Combined cracking and selective hydrogen combustion for catalytic cracking
A catalyst system and process for combined cracking and selective hydrogen combustion of hydrocarbons are disclosed. The catalyst comprises (1) at least one solid acid component, (2) at least one...
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7119241 |
Process for handling catalyst from an oxygenate to olefin reaction
The present invention is a process for removing catalyst fines from an effluent stream in an oxygenate to olefin process. Specifically, the catalyst fines in the effluent stream are separated from...
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7102049 |
Process for operating a quench device in an oxygenate-to-olefin production unit
The present invention is a process for producing olefin(s) from oxygenates that is more effective than previously known processes at removing carbon dioxide from the effluent stream by operating a...
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7094937 |
Compositions comprising cyclohexamantane
Disclosed are compositions comprising C 26 H 30 hexamantane, referred to herein as peri-condensed hexamantane, fully condensed hexamantane, and cyclohexamantane. These enriched cyclohexamantane...
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7081558 |
Process for recovering hydrogen in a gaseous hydrocarbon effluent by chemical reaction
Process for recovery of hydrogen in an effluent that is rich in hydrocarbons and that also contains hydrogen and a light olefin fraction, whereby said process comprises:
a stage a) in which...
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7074971 |
Recovery of ethylene and propylene from a methanol to olefin reaction system
The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane,...
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7060866 |
High pressure separation of dimethyl ether from an olefin stream
Disclosed is a method of removing dimethyl ether from an ethylene and/or propylene containing stream. Dimethyl ether is removed at a high pressure, preferably in a distillation column. The high...
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7060865 |
Recovery of C4 olefins from a product stream comprising C4 olefins, dimethyl ether and C5+ hydrocarbons
Disclosed is a process for removing DME from a stream containing C4 olefins. The process includes providing a first stream comprising C4 olefins, C5+ hydrocarbons, DME, and methanol. The first...
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