Heat management in ethylene oligomerization

a technology of ethylene oligomerization and heat management, which is applied in the direction of hydrocarbon preparation catalysts, bulk chemical production, organic chemistry, etc., can solve the problem of polymer as a by-product, and achieve the effect of reducing the formation of unwanted polymers and not being energy efficien

Inactive Publication Date: 2012-06-07
NOVA CHEM (INT) SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formation of polymer as a by-product is a general problem with many of these ligands.

Method used

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  • Heat management in ethylene oligomerization

Examples

Experimental program
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Effect test

examples

[0117]The following abbreviations are used in the examples:[0118]Å=Angstrom units[0119]NMR=nuclear magnetic resonance[0120]Et=ethyl[0121]Bu=butyl[0122]iPr=isopropyl[0123]c*=comparative[0124]rpm=revolutions per minute[0125]GC=gas chromatography[0126]Rx=reaction[0127]Wt=weight[0128]C4's=butenes[0129]C6's=hexenes[0130]C8's=octenes[0131]PE=polyethylene

Part I: Preferred Ligand Synthesis

General

[0132]This section illustrates the synthesis of a preferred but non-limiting ligand for use in the present invention.

[0133]All reactions involving air and or moisture sensitive compounds were conducted under nitrogen using standard Schlenk or cannula techniques, or in a glovebox. Reaction solvents were purified prior to use (e.g. by distillation) and stored over activated 4 Å sieves. Diethylamine, triethylamine and isopropylamine were purchased from Aldrich and dried over 4 Å molecular sieves prior to use. 1-Bromo-2-fluoro-benzene, phosphorus trichloride (PCl3), hydrogen chloride gas and n-butyllith...

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Abstract

The oligomerization of ethylene using a chromium catalyst having a heteroatomic ligand may be used to provide oligomerization products that are selective towards hexene and / or octene. However, such processes also typically produce some polymer as an undesirable by product. The present invention is directed towards improvements in the selective oligomerization of ethylene.

Description

FIELD OF THE INVENTION[0001]This invention relates to selective ethylene oligomerization reactions.BACKGROUND OF THE INVENTION[0002]Alpha olefins are commercially produced by the oligomerization of ethylene in the presence of a simple alkyl aluminum catalyst (in the so called “chain growth” process) or alternatively, in the presence of an organometallic nickel catalyst (in the so called Shell Higher Olefins, or “SHOP” process). Both of these processes typically produce a crude oligomer product having a broad distribution of alpha olefins with an even number of carbon atoms (i.e. butene-1, hexene-1, octene-1 etc.). The various alpha olefins in the crude oligomer product are then typically separated in a series of distillation columns. Butene-1 is generally the least valuable of these olefins as it is also produced in large quantities as a by-product in various cracking and refining processes. Hexene-1 and octene-1 often command comparatively high prices because these olefins are in h...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07C2/02
CPCC07C2531/14C07C2/36C07C2531/24C07C11/107C07C11/02Y02P20/52C07C2523/26
Inventor JABER, ISAMJOBE, IAN RONALDCHISHOLM, P. SCOTTKRZYWICKI, ANDRZEJCARTER, CHARLES ASHTON GARRETSTROM, VERNON LINDSAYSERHAL, KAMAL L ELIASCLAVELLE, ERICBROWN, STEPHEN JOHNLACOMBE, YVESMAGIS, ANITA SYLVIAHARRIS, MACKENZIE ALEXANDERARCHER, RUSSELL KIRKBESENSKI, KEITH WAYNEBERGHMANS, MICHELGOLOVCHENKO, OLEKSIYSIEBEN, DALE ALEXANDER
Owner NOVA CHEM (INT) SA
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