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Method for producing alpha olefins by oligomerization of ethylene

An ethylene oligomerization and olefin technology, applied in chemical instruments and methods, chemical recovery, hydrocarbons, etc., to achieve the effect of smooth polymer blockage and easy pressure control

Active Publication Date: 2016-08-17
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 producing alpha olefins by oligomerization of ethylene
  • Method for producing alpha olefins by oligomerization of ethylene
  • Method for producing alpha olefins by oligomerization of ethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 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 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). Here, the external container adopts a cylindrical...

Embodiment 2

[0042] Same as Example 1, the difference is 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), and the external The shape of the liquid distributor in the container is cylindrical, and its opening ratio is 85%.

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

Embodiment 3

[0045] Same as embodiment 1, the difference is that the ethylene flow entering the external container is 100Kg / h (accounting for 50% of the total feed amount of ethylene), and the solvent flow is 342kg / h (accounting for 90% of the total solvent consumption), The shape of the liquid distributor in the external container is serpentine, and its opening ratio is 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 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 present invention relates to a method for producing alpha olefins by oligomerization of ethylene. The method a) provides a reaction device in which an external vessel is connected to a loop reactor, wherein a liquid distributor is provided on the top of the external vessel, and the liquid distributor It has the effect of dispersing the liquid; b) pre-dissolving the catalyst components in the reaction solvent, and then continuously introducing the catalyst solution into the loop reactor; c) continuously introducing a part of the pressurized ethylene monomer into the After pre-dissolving in the external container containing the reaction solvent, the reaction solvent dissolved in the ethylene monomer is continuously passed into the loop reactor from the external container; the other part of the pressurized ethylene monomer is directly passed into the container. In a loop reactor with a reaction solvent; d) In the loop reactor, the ethylene monomer is continuously oligomerized under the action of a catalyst, and the alpha olefin obtained by the reaction is dissolved in the reaction solvent and passed through the loop reactor. outflow.

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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Patent Type & Authority Patents(China)
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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