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Processes for the isomerization of feedstocks comprising paraffins of 5 to 7 carbon atoms

A technology for isomerization and paraffin, which is used in isomerization to produce hydrocarbons, chemical instruments and methods, organic chemistry, etc., to achieve the effect of reducing operating costs

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

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  • Processes for the isomerization of feedstocks comprising paraffins of 5 to 7 carbon atoms

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Embodiment Construction

[0044] isomerisation

[0045] Any suitable paraffin-containing feedstock can be used in the process of the present invention. Naphtha feedstocks are most commonly used as feedstocks 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 feed consists essentially of full range naphtha, or in the boiling range of 0-230°C. Typically the feed is light naphtha with an initial boiling point of 10-65°C and a final boiling point of 75-110°C; preferably the final boiling point is less than 95°C.

[0046] Naphtha feedstocks typically contain small amounts of sulfur compounds, totaling less than 10 parts per million by mass (mppm) on an elemental basis. Impu...

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Abstract

In an isomerization process where the isomerization effluent (114) is fractionated in a deisohexanizer (116) to provide a lower boiling fraction (122) containing dimethylbutanes, a higher boiling fraction containing methylpentanes and a bottoms stream (120) containing normal hexane and heavies, the bottoms stream is contacted with a selective permeation membrane (124) to provide a normal hexane-containing permeate (128) suitable for recycle to the isomerization. The energy consumption of the deisohexanizer (116) can be reduced without adversely affecting the octane rating of the overhead (122).

Description

Background technique [0001] The present invention relates to an improved process for the isomerization of paraffins having 5-7 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 the branching and thus the octane number of refinery streams containing paraffins with 4-8 carbon atoms, especially 5-7 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 isome...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/27C07C7/13B01J8/00
CPCC10G2300/1081C10G2300/305C10G2400/02C07C5/277C07C9/16B01J8/00C07C5/27C07C7/13
Inventor L·H·赖斯
Owner UOP LLC
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