Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF7 Cites 72 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a solution process for the oligomerization of ethylene using a special reactor system with two heat exchangers. The process is conducted with an oligomerization catalyst, an activator, and a solvent for the catalyst. The first heat exchanger provides heat to the process, while the second heat exchanger removes heat from the reactor system. This design helps to improve temperature control, especially during non-steady state operations. The invention also includes a third heat exchanger to cool the ethylene feed stream before it enters the reactor. This cooling / heating cycle is not energy efficient and should be avoided during steady state operations. However, it has been found to be useful to mitigate unwanted polymer formation during unsteady operations. Overall, the invention provides a more efficient and controlled process for oligomerization of ethylene.

Problems solved by technology

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Heat management in ethylene oligomerization

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pressureaaaaaaaaaa
temperatureaaaaaaaaaa
pressuresaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com