Abstract: Processes and apparatuses for producing a C8 aromatic isomer product are provided. The processes comprise introducing a raffinate product stream comprising C8 aromatic isomers to an isomerization unit to provide an isomerized stream. The isomerized stream is separated to provide a first stream comprising C8 naphthenes and C7 aromatic hydrocarbons and a second stream comprising C8 aromatic isomers. The first stream is passed to an extractive distillation column to provide a recycle feedstream comprising the C8 naphthenes and an extract stream comprising the C7 aromatic hydrocarbons. The recycle feedstream is passed to the isomerization unit.

Abstract: A process for the production of high purity toluene and para-xylene is described. More specifically, the process involves the production of high purity toluene produced via a light-desorbent selective adsorption process for para-xylene production, such as light desorbent para-xylene extraction, without the need for dedicated solvent extraction or olefin removal from the toluene stream.

Abstract: A process for separating xylenes from a feedstock in which the feedstock is separated into a xylene stream, a benzene rich stream and a light ends stream. Two separation zones may be utilized in which liquid from the first zone sent to a toluene recovery zone and vapor from the first zone is sent to a compression zone. The compressed vapor from the compression zone is sent to the second separation zone.

Abstract: Process and apparatus ensure high on-stream reliability of a complex that requires a heat pump which is using a compound having a high boiling point, such as xylenes. When the compressor is shutdown, it can be isolated from the distillation column and receiver while the column is allowed to continue to operate with an auxiliary reboiler for constant heat input. The heat pump can be started up and heated to the normal process temperature, so that when the heavy vapor is charged to the heat pump, it does not immediately condense into liquid, causing damage to the compressor.

Abstract: A process for the production of high purity toluene and para-xylene is described. More specifically, the process involves the production of high purity toluene produced via a light-desorbent selective adsorption process for para-xylene production, such as light desorbent para-xylene extraction, without the need for dedicated solvent extraction or olefin removal from the toluene stream.

Abstract: A process for separating xylene from a feedstock in which the feedstock is separated into a xylene stream, a benzene rich stream and a light ends stream. Two separation zones may be utilized in which liquid from both is sent to a compression zone and the vapor from the compression zone is combined with a stream prior to the stream entering the second separation zone.

Abstract: The present invention relates to a process and apparatus for reducing the desorbent recovery cost in a light desorbent system. More specifically, the present invention relates to an alternate flow scheme that for pre-fractionation of the extract column feed which includes two extract columns which reduces the desorbent recovery costs in a light desorbent system.

Abstract: The present invention relates to a process and apparatus for reducing the desorbent recovery cost in a light desorbent system. More specifically, the present invention relates to an alternate flow scheme that for pre-fractionation of the extract column feed which includes two extract columns which reduces the desorbent recovery costs in a light desorbent system.

Abstract: The present invention relates to a process and apparatus for reducing the desorbent recovery cost in a light desorbent system. More specifically, the present invention relates to an alternate flow scheme that for pre-fractionation of the extract column feed which includes two extract columns which reduces the desorbent recovery costs in a light desorbent system.

Abstract: A process for separating xylenes from a feedstock in which the feedstock is separated into a xylene stream, a benzene rich stream and a light ends stream. Two separation zones may be utilized in which liquid from the first zone sent to a toluene recovery zone and vapor from the first zone is sent to a compression zone. The compressed vapor from the compression zone is sent to the second separation zone.

Abstract: A process for separating xylene from a feedstock in which the feedstock is separated into a xylene stream, a benzene rich stream and a light ends stream. Two separation zones may be utilized in which liquid from both is sent to a compression zone and the vapor from the compression zone is combined with a stream prior to the stream entering the second separation zone.

Abstract: The present invention relates to a process and apparatus for using a waste heat stream in an aromatics complex. More specifically, the present invention relates to a process and apparatus for using waste heat to drive multiple compressor services within an aromatics complex to achieve energy savings and provide low grade heat that is otherwise wasted.

Abstract: The present invention relates to a process and apparatus for reducing the desorbent recovery cost in a light desorbent system. More specifically, the present invention relates to an alternate flow scheme that for pre-fractionation of the extract column feed which includes two extract columns which reduces the desorbent recovery costs in a light desorbent system.

Abstract: Processes for the recovery of aromatic hydrocarbons from one or more vent gas streams associated with an aromatic complex. The vapor streams are passed to an absorption zone in which an aromatic-selective solvent absorbs the aromatics. The aromatic-selective solvent can be processed along with other solvent extraction streams within the aromatic complex. The absorption zone may be a portion of an existing vessel or column, such as an extractive distillation column or a stabilizer.

Abstract: Processes and apparatuses for producing a C8 aromatic isomer product are provided. The processes comprise introducing a raffinate product stream comprising C8 aromatic isomers to an isomerization unit to provide an isomerized stream. The isomerized stream is separated to provide a first stream comprising C8 naphthenes and C7 aromatic hydrocarbons and a second stream comprising C8 aromatic isomers. The first stream is passed to an extractive distillation column to provide a recycle feedstream comprising the C8 naphthenes and an extract stream comprising the C7 aromatic hydrocarbons. The recycle feedstream is passed to the isomerization unit.

Abstract: Processes and apparatuses for producing a C8 aromatic isomer product are provided. The apparatus comprises an isomerization unit to provide an isomerized stream. An isomerate stripper column is in communication with the isomerization unit to provide an isomerate stripper overhead stream comprising C6? hydrocarbons in an isomerate overhead line and an isomerate stripper bottoms stream in an isomerate bottoms line. A dividing wall naphthene splitter column is in communication with the isomerate bottoms line to provide an overhead naphthene splitter stream comprising the C8 naphthenes and C7 aromatic hydrocarbons in a naphthene splitter overhead line and a naphthene splitter sidedraw stream comprising C8 aromatic isomers in a naphthene splitter sidedraw line. An extractive distillation column is in communication with the naphthene splitter overhead line to provide a recycle feedstream comprising the C8 naphthenes in a recycle line and an extract stream comprising the C7 aromatic hydrocarbons in an extract line.

Abstract: Apparatuses and methods are provided for forming C8 aromatic streams with selected amounts of C9 aromatics. In one embodiment, a method for forming a C8 aromatic stream with a selected amount of C9 aromatics includes fractionating a hydrocarbon stream including C8 and C9 aromatics into a sidedraw fraction and a bottom fraction. The sidedraw fraction includes a portion of the C8 aromatics and a portion of the C9 aromatics. The bottom fraction includes remaining C8 aromatics and C8+ hydrocarbons. The method further includes fractioning the bottom fraction and forming a heavy overhead fraction including the remaining C8 aromatics. Also, the method includes combining the sidedraw fraction and the heavy overhead fraction to form a combined stream having a C9 aromatics composition of from about 0.1 wt % to about 5 wt % about 2 wt % of a total weight of the combined stream.

Abstract: Processes and apparatuses for producing a C8 aromatic isomer product are provided. The apparatus comprises an isomerization unit to provide an isomerized stream. An isomerate stripper column is in communication with the isomerization unit to provide an isomerate stripper overhead stream comprising C6? hydrocarbons in an isomerate overhead line and an isomerate stripper bottoms stream in an isomerate bottoms line. A dividing wall naphthene splitter column is in communication with the isomerate bottoms line to provide an overhead naphthene splitter stream comprising the C8 naphthenes and C7 aromatic hydrocarbons in a naphthene splitter overhead line and a naphthene splitter sidedraw stream comprising C8 aromatic isomers in a naphthene splitter sidedraw line. An extractive distillation column is in communication with the naphthene splitter overhead line to provide a recycle feedstream comprising the C8 naphthenes in a recycle line and an extract stream comprising the C7 aromatic hydrocarbons in an extract line.

Abstract: The xylene isomerization process unit and the transalkylation process units are combined in the present invention. A fractionation column can be shared by the two units, reducing the capital cost of the complex. In some embodiments, a split shell fractionation column and a split separator can be used.

Abstract: A process and system for the production of at least one xylene isomer is provided. The process includes passing a first stream to one side of a split shell fractionation column and a second stream to the other side of the column. The first stream has a higher ratio of methyl to C2+ alkyl-substituted C9 aromatic compounds than the second stream. A bottoms stream from the one side is separated and passed as feed to a transalkylation zone.