[EN] HEAT MANAGEMENT IN ETHYLENE OLIGOMERIZATION<br/>[FR] GESTION DE LA CHALEUR EN OLIGOMÉRISATION D'ÉTHYLÈNE
申请人:NOVA CHEM INT SA
公开号:WO2012071644A1
公开(公告)日:2012-06-07
The oligomerization of ethylene using a chromium catalyst having a heteroatomic ligand is used to provide oligomerization products that are selective towards hexene and/or octene. However, such processes also typically produce some polymer as an undesired by-product. The present invention is directed towards improvements in the selective oligomerization of ethylene wherein said process makes use of heat exchangers to provide heat where polymer by-product fouling of the reactor may occur.
[EN] OLIGOMENZATION OF ALPHA OLEFINS<br/>[FR] OLIGOMÉRISATION D'ALPHA-OLÉFINES
申请人:NOVA CHEM INT SA
公开号:WO2011140629A1
公开(公告)日:2011-11-17
The oligomerization of ethylene using a chromium catalyst having a phosphorus-nitrogen-phosphorus ("P-N-P") ligand is typically activated with an aluminoxane. The addition of an alkyl zinc, particularly diethyl zinc, has been fund to improve the productivity of certain oligomerization reactions. In particular, the addition of diethyl zinc to an oligomerization reaction that is activated by methylaluminoxane (MAO) improves the productivity of the reaction.
[EN] ETHYLENE OLIGOMERIZATION PROCESS WITH ALIIMINOXANE/ORGANOBORON AS ACTIVATORS USING A HALOGENATED AROMATIC SOLVENT<br/>[FR] PROCÉDÉ D'OLIGOMÉRISATION DE L'ÉTHYLÈNE UTILISANT UN SOLVANT AROMATIQUE HALOGÉNÉ AVEC UN ALUMINOXANE/DES COMPOSÉS ORGANOBORÉS COMME ACTIVATEURS
申请人:NOVA CHEM INT SA
公开号:WO2013067620A1
公开(公告)日:2013-05-16
This invention provides a two stage process for the oligomerization of ethylene in the presence of a chromium catalyst having a bridging diphosphine ligand. The process mitigates problems which may be experienced during the unsteady state conditions that exist during "start up". The "start up" protocol of this process is characterized by the use of an aluminoxane activator and a comparatively large amount of a halogenated solvent. After the start up phase, a second activator (which is preferably a non-coordinating borate) is added to the reaction.
[EN] ETHYLENE OLIGOMERIZATION WITH MIXED LIGANDS<br/>[FR] OLIGOMÉRISATION D'ÉTHYLÈNE AU MOYEN DE LIGANDS MIXTES
申请人:NOVA CHEM INT SA
公开号:WO2015083053A1
公开(公告)日:2015-06-11
The selective oligomerization of ethylene to produce a mixture comprising octene and hexene is conducted in the presence of a catalyst system comprising a source of chromium; two different P-N-P ligands and an activator. The phosphorus atoms of both ligands have ortho-fluoro phenyl substituents. The nitrogen atom of the first ligand has an isopropyl substituent. The nitrogen of the second ligand has a larger/bulkier hydrocarbyl substituent on the N atom. The hexene produced by the process of this invention has very high alpha selectivity.