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System and process for flushing residual fluid from transfer lines in simulated moving bed adsorption

a technology of residual fluid and transfer line, which is applied in the direction of hydrocarbon purification/separation, chemistry apparatus and processes, organic chemistry, etc., can solve the problems of detrimental effects of residual compounds in the transfer line, and achieve the effect of reducing energy consumption

Active Publication Date: 2015-04-23
UOP LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a process for using a simulated countercurrent adsorptive separation to separate components in a feed stream by adsorbing them onto a bed of material. The process includes flushing residual fluid from the separation chamber and using it to fill a transfer line, which prevents contamination of the extract stream. The technical effects of the process include reducing energy consumption and preventing contamination of the extract stream.

Problems solved by technology

The art recognizes that the presence of residual compounds in the transfer lines can have detrimental effects on a simulated-moving-bed process.

Method used

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  • System and process for flushing residual fluid from transfer lines in simulated moving bed adsorption
  • System and process for flushing residual fluid from transfer lines in simulated moving bed adsorption
  • System and process for flushing residual fluid from transfer lines in simulated moving bed adsorption

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Embodiment Construction

[0019]Co-pending unpublished U.S. patent application Ser. No. 13 / 630,461 describes a process wherein a first portion of the raffinate stream is directed to a recycle line and a second portion is directed to the raffinate column. As the transfer line used for withdrawing the raffinate stream was previously occupied by the desorbent stream, residual desorbent remains in the transfer line. By directing this first portion of the raffinate stream away from the raffinate column, separation of this residual desorbent in the raffinate column and the associated energy penalty could be avoided. It has been identified, however, that in some systems, when no surge capacity in the feed to the raffinate column is available, the feed to the column may be discontinuous and compromise steady column control.

[0020]Adsorptive separation is applied to the recovery of a variety of hydrocarbon and other chemical products. Chemical separations using this approach which have been disclosed include the separ...

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Abstract

A process according to various approaches includes flushing an intermediate transfer line between a raffinate stream transfer line and a desorbent stream transfer line away from the adsorptive separation chamber to remove residual fluid including desorbent from intermediate transfer line. The process may include directing the residual fluid flushed from the intermediate transfer line to a recycle stream to introduce the residual fluid into the adsorptive separation chamber.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a Division of prior copending U.S. application Ser. No. 13 / 847,832 which was filed on Mar. 20, 2013, the contents of which are hereby incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The subject invention relates to a process for flushing residual fluid from a transfer line in an adsorptive separation process for separating a preferentially adsorbed component from a feed stream. More specifically, the invention relates to a system and process for flushing residual desorbent fluid from a transfer line prior to withdrawing a raffinate stream through the transfer line during the continuous simulated countercurrent adsorptive separation of aromatic hydrocarbons.BACKGROUND OF THE INVENTION[0003]Para-xylene and meta-xylene are important raw materials in the chemical and fiber industries. Terephthalic acid derived from para-xylene is used to produce polyester fabrics and other articles which are in wide us...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07C7/13C07C7/00C07C7/04
CPCC07C7/13C07C7/005C07C7/04C07C7/12C07C15/08
Inventor CORRADI, JASON T.
Owner UOP LLC
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