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Method for oligomerization production of alpha olefin from ethylene

A technology of ethylene oligomerization and olefin, applied in the direction of addition of unsaturated hydrocarbons to hydrocarbon production, organic chemistry, etc., to achieve the effects of increasing the contact area, increasing the concentration, and speeding up the dissolution rate

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

AI Technical Summary

Problems solved by technology

However, it still cannot meet the requirements, and people hope to further improve the performance of the catalyst to increase the activity of the catalyst.

Method used

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  • Method for oligomerization production of alpha olefin from ethylene

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 As shown, the technical process according to the present invention is as follows, taking ethylene trimerization to produce 1-hexene as an example, the material ethylene flow rate in the reaction (200kg / h, polymer grade, commercially available), the reaction solvent is heptane (flow rate is 380kg / h, commercially available) and chromium-based catalysts (calculated as chromium, with a concentration of 1mol / L Cr, commercially available). After purging the closed reaction system with inert gas, replace it with ethylene for 2-3 times and dry it at 120°C for 3 hours, then feed ethylene to keep the pressure of the external container at 5.5 MPa, and the flow rate of ethylene into the external container is 80kg / h (accounting for 40% of the total ethylene feed), and the flow rate of the reaction solvent entering the external container is 320kg / h (accounting for 84% of the total solvent consumption). Here, the external container is a cylindrical container, and the ...

Embodiment 2

[0036] Embodiment 2 is the same as Example 1, except that the ethylene flow entering the external container is 20Kg / h (accounting for 10% of the total amount of ethylene feed, and the solvent flow is 190kg / h (accounting for 50% of the total solvent consumption). ), the shape of the gas distributor in the external container is disc-shaped, and its opening rate is 85%.

[0037] According to this example, the activity of the catalyst was 365kg oligomerization product / (g·Cr·h), and the loop reactor operated continuously for 93 days without any abnormal fluctuations, maintaining stable production.

Embodiment 3

[0039] Embodiment 3 is the same as Example 1, except that the ethylene flow entering the external container is 100Kg / h (accounting for 50% of the total amount of ethylene feed), and the solvent flow is 342kg / h (accounting for 90% of the total solvent consumption). %), the external container is ellipsoidal, the shape of the gas distributor in the external container is cylindrical, and its opening ratio is 35%. The reaction temperature in the reactor was maintained at 110° C., and the reaction pressure was 5.1 MPa.

[0040] According to this example, the activity of the catalyst is 360kg oligomerization product / (g·Cr·h), the reaction system has been running stably for 92 days, and there is no polymer blockage or abnormal pressure fluctuation in the loop reactor, and it remains stable Production.

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Abstract

The invention relates to a method for oligomerization production of alpha olefin from ethylene. The method provides a reaction device comprising an outer container connected to a circular pipe reactor, a gas distributor is arranged in the outer container, and a reaction solvent is fed into the outer container so that the reaction solvent contacts with a part or all the gas distributor and thus a vinyl monomer goes through a gas distributor and is fed into the solvent, mass transfer between the vinyl monomer and the reaction solvent is promoted and a dissolution amount of the vinyl monomer in the outer container is improved. Through contact between the vinyl monomer and the catalyst in the reactor, an olefin oligomerization reaction is induced fast. The method realizes high catalyst activity easily. Compared with the prior art, the method controls reactor pressure easily, avoids blocking of the reactor and has high catalyst activity.

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 oligomerization, cheap small molecule olefins can be transformed 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, and is also a raw material for some fine chemicals. Compared with 1-butene copolymer, LLDPE resin copolymerized with 1-hexene has significantly better tensile strength, impact strength, tear resistance and durability, and is especially suitable for packaging films and greenhouses and sheds And other agricultural mulch film. [0003] In EP0608447A1, a chromium-based catalyst composition has been reported as a catalyst for ethylene oligomerization and / or copo...

Claims

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Application Information

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IPC IPC(8): C07C11/107C07C11/02C07C2/08
Inventor 栗同林祁彦平隋军龙徐珂吴红飞王霄青
Owner CHINA PETROLEUM & CHEM CORP
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