Method for oligomerization production of alpha olefin from ethylene

An ethylene oligomerization and olefin technology, applied in chemical instruments and methods, chemical recovery, hydrocarbons, etc., to facilitate pressure control and smooth polymer blocking

Active Publication Date: 2014-10-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for oligomerization production of alpha olefin from ethylene
  • Method for oligomerization production of alpha olefin from ethylene
  • Method for oligomerization production of alpha olefin from ethylene

Examples

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Embodiment 1

[0037] Such as figure 1 As shown, the process flow according to the present invention is as follows. Taking ethylene trimerization to prepare 1-hexene as an example, the ethylene flow rate (200kg / h, polymerization grade, commercially available), solvent (380kg / h, heptane) in the reaction , Commercially available) and chromium-based catalyst (in terms of chromium, the concentration is 0.5mol / L·Cr, commercially available), the volume of the external container 9 is 0.5 cubic meters. After purging the closed reaction system with inert gas, replacing it with ethylene for 2-3 times and drying at 120°C for 3 hours, pass ethylene to keep the pressure of the external container at 5.3MPa, and the ethylene flow into the external container 80kg / h (accounting for 40% of the total ethylene feed volume), the solvent flow into the external container is 320kg / h (accounting for 84% of the total solvent consumption), where the external container is a cylindrical container, and the external contain...

Embodiment 2

[0042] Same as Example 1, except that the ethylene flow rate into the external container is 20Kg / h (accounting for 10% of the total ethylene feed volume, and the solvent flow rate is 190kg / h (accounting for 50% of the total solvent consumption). The shape of the liquid distributor in the container is cylindrical, and its opening rate is 85%.

[0043] According to this example, the catalyst activity was 350 kg oligomerization product / (g·Cr·h), and the loop reactor was continuously operated for 80 days without abnormal fluctuations, maintaining stable production.

Embodiment 3

[0045] Same as Example 1, except that the ethylene flow rate into the external container is 100Kg / h (accounting for 50% of the total ethylene feed amount), and the solvent flow rate is 342kg / h (accounting for 90% of the total solvent consumption). The shape of the liquid distributor in the external container is a serpentine tube with an opening rate of 15%. The reaction temperature in the reactor was maintained at 110°C, and the reaction pressure was 5.0 MPa.

[0046] According to this example, the activity of the catalyst is 345kg oligomerization product / (g·Cr·h), the reaction system runs stably for 100 days, and there is no polymer blockage or abnormal pressure fluctuation in the loop reactor, which is stable produce.

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Abstract

The invention relates to a method for oligomerization production of alpha olefin from ethylene. The method comprises the following steps of a, providing a reaction device comprising an outer container connected to a circular pipe reactor, wherein the top of the outer container is provided with a liquid distributor and the liquid distributor has the effect of liquid dispersion, b, pre-dissolving a catalyst ingredient in a reaction solvent and continuously introducing the catalyst solution into the circular pipe reactor, c, continuously feeding one part of a vinyl monomer subjected to pressurization into the outer container with the reaction solvent for pre-dissolution, continuously feeding the reaction solvent containing the vinyl monomer into the circular pipe reactor from the outer container, and directly feeding the other part of the vinyl monomer subjected to pressurization into the circular pipe reactor with the reaction solvent, and d, carrying out continuous oligomerization reaction process on the vinyl monomer under the action of the catalyst in the circular pipe reactor, and discharging the produced alpha olefin dissolved in the reaction solvent from the outlet of the circular pipe reactor.

Description

Technical field [0001] The invention relates to the field of olefin oligomerization, in particular to a method for producing alpha olefin by ethylene oligomerization. Background technique [0002] Ethylene oligomerization is one of the most important reactions in the olefin polymerization industry. Through the oligomerization reaction, cheap small molecular olefins can be converted into products with high added value, such as 1-hexene and 1-octene. Among them, 1-hexene is an important comonomer for the production of LLDPE and HDPE, as well as a raw material for some fine chemicals. Compared with the copolymer of 1-butene, the LLDPE resin copolymerized with 1-hexene has excellent tensile strength, impact strength, tear resistance and durability. It is especially suitable for packaging films, greenhouses and greenhouses. And other agricultural mulch film. [0003] EP0608447A1 reported a chromium-based catalyst composition as a catalyst for ethylene oligomerization and / or copolymeri...

Claims

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Application Information

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IPC IPC(8): C07C11/107C07C2/24
CPCY02P20/582
Inventor 栗同林祁彦平隋军龙徐珂张立超王霄青
Owner CHINA PETROLEUM & CHEM CORP
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