Method for preparing 1-ethene under ethene oligomerizating catalyst system

Abstract

A process for preparing 1-hexene under existance of ethylene oligonerizing catalyst includes such steps as premixing part of ethylene gas with solvent, mixing with the components in catalyst system, including chromic compound, pyrrol derivative, alkylaluminium and improver, loading in reactor via gas distributor, directly loading the rest of ethylene gas in reactor, discharging the resultant liquid, adding catalysis stopping agent, and separating. Its advantages are high selectivity of 1-hexene and high catalytic activity.

Description

technical field [0001] The present invention relates to a method for preparing 1-hexene in the presence of an ethylene oligomerization catalyst system. Background technique [0002] EP 0608447A1 reports a chromium-based catalyst composition as a catalyst for ethylene oligomerization and / or copolymerization, wherein a chromium-containing compound is used as one of the components of the catalyst composition; pyrrole compound is used as a chromium-based catalyst combination The second component of the material; a Lewis acid and / or metal alkyl compound is used as the third component of the catalyst composition as an activator; it is also pointed out that a halogen can also be selected in the catalyst system As the fourth component of the catalyst composition, the halogen source can be either an inorganic halide or many types of organic halides. The catalyst has a higher selectivity to 1-hexene, but its catalytic activity not tall. [0003] Sn(OSO 2 f 3 ) 2 The compound repl...

AI Technical Summary

Problems solved by technology

But still can not meet the requirements, people hope to further improve the performance of the catalyst, in order to improve the catalytic activity

[0005] Above ethylene oligomerization method all lays particular emphasis on the research to catalyst, although WO 99 / 19380 has carried out research to ethylene oligomerization method, similar with other patents, reaction is carried out in common autoclave basically, and thereby Problems with uneven mass and heat transfer

Since the reaction is a strong exothermic reaction, and the heat release rate is faster at the initial stage of the reaction, the local temperature is often too high due to the slow heat transfer rate, causing part of the catalyst to be deactivated, which affects the efficiency of the catalyst; and because in this reaction The mass transfer rate in the kettle is slow, which affects the catalytic effect of the complex catalyst, reduces the catalytic activity, and often takes a long reaction time, resulting in increased energy consumption

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