Process for separating olefins from saturated hydrocarbons

a technology of saturated hydrocarbons and olefins, which is applied in the direction of hydrocarbon purification/separation, chemical apparatus and processes, organic chemistry, etc., can solve the problems of not being very selective in the production of olefins, adding a significant cost to the manufacture of olefins, and difficult to separate and isolate these species

Inactive Publication Date: 2006-07-06
SLAUGH LYNN HENRY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these streams rely on the use of ethylene as a feedstock material, which add a significant cost to the manufacture of the olefin.
The FT process, however, is not very selective to the production of olefins.
Separating and isolating these species is no easy task.
Conventional distillation methods are frequently inadequate to separate species having closely related boiling points.
Many reactive methods for separating species in an FT stream do not, however, selectively react with olefins while simultaneously reject paraffins.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0069] To illustrate the concept of the invention, a Fisher-Tropsch stream comprised of the composition set forth in Table 1 was used as a feedstock. The FT composition was derived by passing syngas over an FT catalyst and subsequently distilling products in the boiling point range of hexyl to undecyl hydrocarbons. This composition was used as the feed. Hydrocarbons in the C7-C10 were the most abundant.

[0070] 0.24 moles (42.2 g) of anthracene having a 95% purity and 150 g of the feedstock were placed in an autoclave. The total olefin content of the charged feed was about 0.5 moles (55.9 g). The autoclave was sealed and then purged with nitrogen. The autoclave was heated to 255° C. for four hours to form the Diels-Alder adduct between the olefin and the anthracene. The autoclave contents were stirred during heating.

[0071] Once the reaction was complete, the autoclave was cooled to 20° C. The product mixture was transferred to a glass flask and the unreacted olefin, saturated hydroc...

example 2

[0075] In this example, an F-T stream having the composition set forth in Table 2 was treated with anthracene. This F-T stream was derived by passing syngas over an FT catalyst and subsequently distilling and collecting the products in the boiling point range of pentyl to nonyl (C5-C9).

[0076] 0.6 moles (112 g) of anthracene having a 95% purity and 96 g of the feedstock were placed in a 300 ml autoclave. The autoclave was sealed and then purged with nitrogen. The autoclave was heated to 255° C. for seven hours to form the Diels-Alder adduct between the olefin and the anthracene. The autoclave contents were stirred during heating.

[0077] Once the reaction was complete, the autoclave was cooled to 20° C. The product mixture was transferred to a glass flask and the unreacted olefin, saturated hydrocarbons, and unreacted oxygenates were removed from the reaction mixture by distillation. The material remaining in the flask was heated to a temperature ranging from 300-350° C. to dissociat...

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Abstract

This invention relates to a process for separating and isolating olefins from saturated hydrocarbons, and in particular, to a process for separating and isolating olefins from saturated hydrocarbons in a Fisher-Tropsch stream. There is provided a process for separating olefins from saturated hydrocarbons in a feedstock, comprising: contacting a feedstock comprising olefins and saturated hydrocarbons, such as paraffins, with a linear polyaromatic compound under conditions effective to form a reaction mixture comprising linear polyaromatic compound-olefin adducts and saturated hydrocarbons; separating the linear polyaromatic compound-olefin adducts from the saturated hydrocarbons in the reaction mixture to form a saturated hydrocarbon stream and an adducted olefin stream; dissociating the linear polyaromatic compound-olefin adducts to form linear polyaromatic compounds and an olefin composition; and optionally separating the linear polyaromatic compound formed in step c) from the olefin composition; whereby the olefin composition is enriched in the concentration of olefins over the concentration of olefins in the feedstock and the saturated hydrocarbon stream is enriched in saturated hydrocarbons over the concentration of saturated hydrocarbons in the feedstock.

Description

1. FIELD OF THE INVENTION [0001] This invention relates to a process for separating olefins from saturated hydrocarbons, and more particularly, to a process for separating olefins from saturated hydrocarbons in a Fisher-Tropsch (FT) stream. 2. BACKGROUND OF THE INVENTION [0002] Many industrial processes produce olefin / saturated hydrocarbon streams that are mixtures of olefins, saturated hydrocarbons, and oxygenates. Olefins are frequently used in the manufacture of polymers such as polyethylene, as drilling mud additives, or as intermediates for the production of oil additives and detergents. Some industrial processes manufacture olefins streams by oligomerizing ethylene over an alpha olefin catalyst to produce mixtures of alpha and internal olefins having a broad range of carbon numbers. However, these streams rely on the use of ethylene as a feedstock material, which add a significant cost to the manufacture of the olefin. On the other hand, the FT process starts with an inexpensi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07C7/00C07C1/04C07C7/152C07C11/02C07C11/10C07C11/107
CPCC07C1/04C07C7/152C07C11/02C10G2/32
Inventor SLAUGH, LYNN HENRYFENOUIL, LAURENT ALAINFONG, HOWARD LAM-HO
Owner SLAUGH LYNN HENRY
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