Method for producing alpha olefin through ethylene oligomerization

A technology of ethylene oligomerization and olefins, which is applied in the production of bulk chemicals, addition of unsaturated hydrocarbons to hydrocarbons, organic chemistry, etc., to achieve the effects of easy pressure control and smooth polymer blockage

Active Publication Date: 2014-07-02
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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  • Method for producing alpha olefin through ethylene oligomerization

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Embodiment 1

[0030] 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 (200kg / h, polymerization grade, commercially available) in the reaction, solvent (380kg / h, heptane , commercially available) and a chromium-based catalyst (calculated as chromium, with a concentration of 0.5mol / L·Cr, commercially available), and the volume of the external container 9 (cylindrical) is 0.5 cubic meters. 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 5.3MPa, and the flow of ethylene into the external container is 80kg / h (accounting for 40% of the total ethylene feed), and the solvent flow into the external container is 320kg / h (accounting for 84% of the total solvent consumption), where the external container is a c...

Embodiment 2

[0035] Embodiment 2 is the same as Example 1, except that the external container is a cube, and the ethylene flow entering the external container is 20Kg / h (accounting for 10% of the total feed amount of ethylene, and the solvent flow is 190kg / h (accounting for 50% of the total solvent consumption).

[0036] According to this example, the catalyst activity was 274kg oligomerization product / (g·Cr·h), and the loop reactor was operated continuously for 80 days without any abnormal fluctuations, maintaining stable production.

Embodiment 3

[0038] Embodiment 3 is the same as Example 1, except that the external container is an ellipsoid, and the ethylene flow entering the external container is 80Kg / h (accounting for 40% of the total feed amount of ethylene), and the solvent flow is 342kg / h (accounting for 90% of the total solvent consumption). The reaction temperature in the reactor was maintained at 110° C., and the reaction pressure was 5.5 MPa.

[0039]According to this example, the activity of the catalyst is 286kg oligomerization product / (g·Cr·h), the reaction system has been continuously and stably operated for 100 days, and there is no polymer blocking, abnormal pressure fluctuation, etc. in the loop reactor, and it remains stable Production.

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Abstract

The invention relates to a method for producing alpha olefin through ethylene oligomerization. The method comprises the steps of a) providing a reaction device in which an external container is connected with a loop reactor; b) pre-dissolving a catalyst component into a reaction solvent, and then continuously introducing the solution of the catalyst into the loop reactor; c) continuously introducing a part of supercharged ethylene monomer into the external container filled with the reaction solvent, pre-dissolving the ethylene monomer, and continuously introducing the reaction solvent dissolved with the ethylene monomer from the external container to the loop reactor; directly introducing the other part of supercharged ethylene monomer into the loop reactor filled with the reaction solvent; d) performing continuous oligomerization reaction on the ethylene monomer in the presence of a catalyst in the loop reactor, dissolving the alpha olefin obtained by the reaction into the reaction solvent, and discharging the solution through the outlet of the loop reactor. Compared with the prior art, the method has the advantages that the pressure control of the reactor is easy, the reactor is prevented from being blocked, the activity of the catalyst is high and the like.

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): C07C11/02C07C2/08
CPCY02P20/52
Inventor 祁彦平栗同林隋军龙张立超徐珂
Owner CHINA PETROLEUM & CHEM CORP
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