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Processes for the isomerization of paraffins of 5 and 6 carbon atoms with methylcyclopentane recovery

A technology for isomerization and paraffin, which is used in isomerization to produce hydrocarbons, chemical instruments and methods, organic chemistry, etc. to improve economic feasibility and reduce membrane surface area.

Inactive Publication Date: 2008-04-30
UOP LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

C 6 The Permeate Flow Index reflects the permeation rate per square meter of retentate lateral surface area, but is not normalized by film thickness

Method used

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  • Processes for the isomerization of paraffins of 5 and 6 carbon atoms with methylcyclopentane recovery

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Embodiment Construction

[0048] isomerisation

[0049] Any suitable paraffin-containing feedstock can be used in the process of the present invention. Naphtha feedstock is most commonly used as a feedstock for isomerization processes. The naphtha feedstock contains paraffins, naphthenes, and aromatics, and may contain small amounts of olefins in the gasoline boiling range. Feedstocks that may be used include straight run naphtha, natural gasoline, synthetic naphtha, thermal gasoline, catalytically cracked gasoline, partially reformed naphtha, or raffinate from aromatics extraction. The feedstock consists essentially of full range naphtha, or is in the boiling range of 0-230°C. Usually the feedstock is light naphtha with an initial boiling point of 10-65°C and a final boiling point of 75-110°C; preferably a final boiling point of less than 95°C.

[0050] Naphtha feedstocks generally contain small amounts of sulfur compounds totaling less than 10 parts per million by mass (mppm) on an elemental basis...

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Abstract

In an isomerization process where the isomerization effluent (108) is fractionated in a deisohexanizer (116) to provide an overhead (118) containing dimethylbutanes and a higher boiling fraction (122) containing normal hexane, the higher boiling is contacted with a selectively permeable membrane (124) to provide a retentate containing methylcyclopentane (128). If desired, the normal hexane-containing permeate can be recycled for isomerization. The preferred membranes are sieving membranes having a C6 Permeate Flow Index of at least 0.01 and a C6 Permeate Flow Ratio of at least 1.25:1.

Description

Background technique [0001] The present invention relates to an improved process for the isomerization of paraffins having 5 and 6 carbon atoms to provide, for example, a research octane-enhanced isomerized product for transfer into gasoline pools, in particular to the use of a de-isohexanizer the above method. [0002] Methods for isomerizing paraffins to more highly branched paraffins are widely practiced. A particularly important industrial isomerization process is used to increase branching and thus octane of refinery streams containing paraffins with 4 to 8 carbon atoms, especially 5 and 6 carbon atoms. The isomerized product is typically blended with refinery reformer effluent to provide a blended gasoline blend having a desired research octane number (RON). [0003] The isomerization process proceeds towards thermodynamic equilibrium. Thus, the isomerized product still contains n-paraffins with a low octane number, thereby reducing the octane number of the isomerized...

Claims

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Application Information

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IPC IPC(8): C07C5/27C07C7/13B01J8/00
CPCC07C5/2767C10G45/58C07C7/13C10G31/11C10G65/04C07C9/16
Inventor D·J·谢克特尔勒L·H·赖斯
Owner UOP LLC
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