Method for preparing linear alpha-olefins

摘要

The present invention relates to a method for preparing linear alpha-olefins (LAO) by oligomerization of ethylene in the presence of a solvent and homogeneous catalyst, comprising the steps of:
(i) feeding ethylene, solvent and catalyst into an oligomerization reactor,(ii) oligomerizing the ethylene in the reactor,(iii) removing a reactor outlet stream comprising solvent, linear alpha-olefins, optionally unreacted ethylene and catalyst from the reactor via a reactor outlet piping system,(iv) dosing at least one additive selected from the group consisting of alcohols, poly-ethylene glycols, polyethylene glycol monoethers, polyethylene glycol diethers, polyamines, amines, amino alcohols and surfactants,(v) transferring the reactor outlet stream containing the additive to a catalyst deactivation and removal section, and(vi) deactivating the catalyst with caustic and removing the deactivated catalyst from the reactor outlet stream,

wherein the residence time of the additive in the reactor outlet stream prior to mixing with caustic is at least 1 second preferably at least 5 seconds, more preferably at least 10 seconds.

主权项

1. A method for producing linear alpha-olefins (LAO) by oligomerization of ethylene in the presence of a reaction feed comprising a solvent and a homogeneous catalyst, comprising the steps of:
(i) contacting ethylene with the reaction feed under oligomerization conditions and producing a reaction product comprising linear alpha-olefins the solvent and the catalyst, (ii) dosing said reaction product with at least one additive selected from the group consisting of alcohols, polyethylene glycols, polyethylene glycol monoethers, polyethylene glycol diethers, polyamines, amines, amino alcohols and surfactants, (iii) then treating the dosed reaction product with caustic to deactivate the catalyst in the reaction product, wherein the residence time of the additive in the dosed reaction product prior to treating the dosed reaction product with caustic is at least 10 seconds and does not exceed 100 seconds.