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Fouling prevention method and method for olefin oligomerization

An olefin and reactor technology, which is applied in the field of fouling prevention, can solve the problems of insufficient fouling inhibition effect, reduced partial pressure of olefin monomers, and reduced polymerization activity, and achieves rapid start of reaction efficiency, easy removal, and improved production efficiency. Effect

Active Publication Date: 2020-02-11
SK INNOVATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method as described above has the problem of requiring high costs such as long-term interruption of production during the coating operation.
Secondly, U.S. Patent No. 3,984,387 discloses a method of feeding inert gases such as nitrogen and helium together with olefin monomers into a reactor, but there is a problem that the partial pressure of olefin monomers decreases, resulting in a decrease in polymerization activity.
Then, U.S. Patent No. 4,012,574 discloses a method of adding a scale-preventing agent including a perfluorocarbon group and a hydrophilic group at the time of polymerization, but has an insufficient scale-inhibiting effect question

Method used

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  • Fouling prevention method and method for olefin oligomerization
  • Fouling prevention method and method for olefin oligomerization
  • Fouling prevention method and method for olefin oligomerization

Examples

Experimental program
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Effect test

preparation example 1

[0133] Bis-[(S,S)-(phenyl) 2 PCH(methyl)CH(methyl)P(phenyl) 2 Dichloro(μ-chloro)chromium]([CrCl 2 (μ-Cl){(P,P)-k2-(S,S)-((Ph) 2 P(Me)CH-CH(Me)P(Ph) 2 )}] 2 ) preparation

[0134] 1.1 g (3.0 mmol) of trichlorotri(tetrahydrofuran) chromium (CrCl 3 (THF) 3 ) was dissolved in 100mL of dichloromethane, then 1.28g (3.0mmol) of (S,S)-(phenyl) 2 PCH(methyl)CH(methyl)P(phenyl) 2 The ligand compound was also dissolved in 50 mL of dichloromethane and added slowly. After the reaction was stirred for 3 hours, the volatiles were removed in vacuo, and then 100 mL of petroleum ether was added dropwise, resulting in the precipitation of a blue solid. Washed twice with 100 mL of petroleum ether to obtain 1.58 g of the title compound (90% yield).

Embodiment 1

[0136] Add 1L of methylcyclohexane (MCH) to a 2L capacity semi-batch reactor replaced with nitrogen after fully drying, disperse 20mg of sodium chloride (NaCl) in 10ml of MCH, and add to the semi-batch in the reactor. 1.57 g (4 mmol) of a 18 wt% mMAO-3A heptane solution as a cocatalyst was added to the reactor, and the temperature of the semi-batch reactor was then heated to 60°C. Afterwards, ethylene was filled to a pressure of 27 bar in the reactor. Add 3.1 mg (5.3 μmol-Cr) of bis-[(S,S)-(phenyl) 2 PCH(methyl)CH(methyl)P(phenyl) 2 Dichloro(μ-chloro)chrome], then filled with ethylene to a pressure of 30 bar in the reactor, then continuously supplied ethylene, and carried out oligomerization for 80 minutes (stirring condition: 200 rpm). Afterwards, 100ml of ethanol (weight:weight, 10% by volume hydrochloric acid aqueous solution: ethanol=1:1) containing 10 volume % hydrochloric acid aqueous solution was added in the reaction solution to terminate the reaction, and then the ...

Embodiment 2

[0140] In addition to using sodium phosphate (Na 3 PO 4 ) to replace sodium chloride (NaCl), proceed in the same manner to obtain a reaction product, and measure the weight of a by-product and a secondary by-product by the same method as in Example 1.

[0141] As a result, the reaction product (LAO, C6+C8) of 1.58 ratio (C8 / C6) was obtained, and the total amount of polyethylene (total PE) obtained as a by-product was 1.52 g, wherein the primary by-product was 0.82 g, and the secondary by-product was 0.82 g. The by-product was 0.70 g (see Table 1 below).

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Abstract

The present invention provides a fouling prevention method and a method for olefin oligomerization, wherein in the method for olefin oligomerization, a predetermined anti-fouling agent is added, thereby minimizing the production of sticking byproducts generated during the reaction and fundamentally preventing the fouling of the byproducts, generated during the reaction, on an inner wall of a reactor.

Description

technical field [0001] The present invention relates to a method for preventing fouling and a method for oligomerization of olefins. Background technique [0002] The linear alpha-olefin (Linearalpha-olefin, LAO) required for the preparation of high value-added linear low-density polyethylene is obtained through the oligomerization of olefins. However, in the oligomerization reaction of olefins, a large amount of butene, other olefins and their isomers, specific high-level oligomers, polymers (for example, polyethylene) etc. are produced together, and the catalyst and olefins released from the carrier A part of by-products (for example, polyethylene) generated at the time of oligomerization adheres to the inner wall of the reactor and the surface of a heat exchanger provided in the reactor, or floats in the reactor to form fouling. [0003] The fouling in the reactor as described above makes it difficult to control the heat of reaction, and hinders the uniform diffusion of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/20C07C2/32C07C11/06
CPCC07C2/32C07C2531/24C07C2531/26B01J2231/20B01J2531/62B01J31/143B01J31/2409C10G75/04B01J19/0026B01J2219/00047B01J2219/00247C07C11/02C07C11/107C07C7/20C07C11/06B01J2208/00707B01J19/002C07C2/34C07C2/06C07C2/04C07C2/36C07C2/08C07C2/26C07C11/04
Inventor 朴孝承朴灿泉沈素姬宋寅浃郑溢九金明镇
Owner SK INNOVATION CO LTD
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