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Processes for the isomerization of normal butane to isobutane

A technology of isomerization and n-butane, applied in the field of at least part of isobutane contained in n-butane-containing raw materials, to achieve the effect of reducing diameter and number of distillation trays, reducing load and eliminating weak links

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

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  • Processes for the isomerization of normal butane to isobutane
  • Processes for the isomerization of normal butane to isobutane

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Embodiment Construction

[0047] isomerisation

[0048] Any suitable n-butane-containing feedstock can be used in the process of the present invention. The feedstock may be obtained from any suitable source including, but not limited to, fractionation or liquefaction of gaseous or normally liquid petroleum feedstocks, from synthetic paraffins such as from the Fischer-Tropsch process, cracking of higher molecular weight hydrocarbons, and the like. The composition of a feedstock depends on the source of the feedstock. Preferably the feedstock comprises at least 30, eg 50 to substantially 100 mass % n-butane. Other components that may be present include isobutane, butenes, and lighter and heavier hydrocarbons. Generally, lighter hydrocarbons are present in an amount of less than 20, preferably less than 5% by mass and heavier hydrocarbons are present in an amount of less than 10, preferably less than 5% by mass. In raw materials containing C 5 In the case of hydrocarbons or heavier hydrocarbons, it is...

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Abstract

In a normal butane isomerization process where the isomerization effluent (108, 114) is fractionated in a deisobutanizer (116) operated such that a lower boiling fraction (118) is provided containing at least 80 mass-% isobutane and a higher boiling fraction (122) containing normal butane and at least 10 mass-% isobutane. The higher boiling fraction (122) is contacted with a selectively permeable membrane (124) to provide a permeate (126) containing normal butane-containing and a retentate (128) containing at least 80 mass-% isobutane. The preferred membranes are sieving membranes having a C4 Permeate Flow Index of at least 0.01 and a C4 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 n-butane to isobutane using a combination of a de-isobutanizer and a membrane, and to the use of a membrane to recover at least a portion of the n-butane-containing feedstock used for isomerization. Improved process for isobutane, the membrane is selectively permeable to n-butane over isobutane. The process of isomerizing n-butane to isobutane is widely practiced. This isomerization process proceeds towards thermodynamic equilibrium. Therefore, the isomerized product still contains a considerable concentration of n-butane, usually the molar ratio of isobutane to n-butane is 1.2:1-2:1. The sought isobutane product is obtained by distillation (de-isobutanizer) to obtain a relatively pure isobutane product as an overhead distillate and an n-butane-containing fraction recycled to the isomerization reactor, which The purity is usually at least 80, often at least 90 or greate...

Claims

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Application Information

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IPC IPC(8): C07C5/27C07C7/13B01J8/00
CPCB01D61/145C07C7/13C07C5/2767B01D61/362C10G2400/20C07C5/277C07C7/144C07C9/12C07C5/27B01J8/00
Inventor D·J·谢克特尔D·J·希尔兹
Owner UOP LLC
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