Method for preparing 1-ethene under ethene oligomerizating catalyst system

Abstract

A process for preparing 1-hexene under existance of ethylene oligomerizing catalyst system includes such steps as mixing solvent with the components in said catalyst system, including chromic compound, pyrrole derivative, alkyl aluminium and improver, loading in reactor, mixing ethylene gas with cyclic reactive liquid, spraying it in reactor, discharging the resulatant liquid, cooling part of the resultant liquid and mixing it with said ethylene, and loading the rest of the resulant liquid in separator. Its advantages are high activity of catalyst and high transform rate of ethylene.

Description

technical field [0001] The present invention relates to a new method for preparing 1-hexene in the presence of an ethylene oligomerization catalyst system. 2. Background technology [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 compo...

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

[0006] 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

Because this 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 and affecting the efficiency of the catalyst, so the ethylene conversion rate is low ( 50 to 70%); and because the mass transfer rate in this reactor is slow, the catalytic effect of the complex catalyst is affected, the catalytic activity is reduced, and the reaction time is often longer, resulting in increased energy consumption

In addition, because the reaction is a high-pressure reaction and requires stirring, an additional transmission device is required, which also brings problems of sealing and safety.

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