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Method for oligomerization of ethylene to alpha-olefins and pretreatment method of catalyst and solvent thereof

A catalyst and pretreatment technology, applied in the direction of carbon compound catalysts, catalysts, chemical instruments and methods, etc., can solve problems affecting catalyst activity, reduce ethylene partial pressure, etc., achieve reduced material loss, reduced ethylene unit consumption, and stable reaction activity Effect

Active Publication Date: 2018-12-18
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a method for ethylene oligomerization to α-olefins and a pretreatment method for catalysts and solvents, so as to solve the problem in the prior art that the accumulation of nitrogen in the reaction system reduces the partial pressure of ethylene and affects the activity of the catalyst

Method used

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  • Method for oligomerization of ethylene to alpha-olefins and pretreatment method of catalyst and solvent thereof
  • Method for oligomerization of ethylene to alpha-olefins and pretreatment method of catalyst and solvent thereof
  • Method for oligomerization of ethylene to alpha-olefins and pretreatment method of catalyst and solvent thereof

Examples

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Effect test

Embodiment 1

[0066] This embodiment is a process for ethylene trimerization to 1-hexene. The catalyst system and solvent system are packed with polymer grade ethylene. The specific operation is as follows: (the holding pressure is 0.15MPa)

[0067] The solvent cyclohexane is dehydrated and refined with ethylene (via attached figure 1 The bubbling line of the medium refining solvent tank 8) enters the bubbling replacement from the bottom of the refining solvent tank C for 5 minutes, and then ethylene (via attached figure 1 Medium-refined solvent tank holding pressure line 7) holding pressure 0.15MPa.

[0068] The catalyst is a system of four components, namely: chromium isooctanoate (5wt%), 2,5-dimethylpyrrole (5wt%), triethylaluminum (50wt%), hexachlorocyclohexane (25wt%) ), and the rest are solvents. The four catalyst components are separated by the catalyst tank (attached figure 1 Middle catalyst receiving tank D, four in total) after receiving, use ethylene (through attached figur...

Embodiment 2

[0077] This embodiment is a process for ethylene trimerization to 1-hexene. The catalyst system and solvent system are packed with polymer grade ethylene. The specific operation is as follows: (the holding pressure is 0.2MPa)

[0078] The solvent n-heptane is dehydrated and refined with ethylene (via attached figure 1 The bubbling line of the medium refining solvent tank 8) enters the bubbling replacement from the bottom of the refining solvent tank C for 10 minutes, and then ethylene (via attached figure 1 Medium refining solvent tank pressure holding line 7) holding pressure 0.2MPa.

[0079] The catalyst is a four-component system, namely: chromium isooctanoate (2wt%), 2,5-dimethylpyrrole (2wt%), triethylaluminum (25wt%), 1,4-(two) tri Chloromethyl-2,3,5,6-tetrachlorobenzene (8wt%) and the rest are solvents. The four catalyst components are separated by the catalyst tank (attached figure 1 Middle catalyst receiving tank D, four in total) after receiving, use ethylene (t...

Embodiment 3

[0089] This embodiment is a process for ethylene oligomerization to α-olefins, wherein the selectivity of 1-octene is greater than 70%, and the sum of the selectivities of 1-hexene and 1-octene reaches more than 90%. The catalyst system and solvent system are packed with polymer grade ethylene. The specific operation is as follows: (the holding pressure is 1.0MPa)

[0090] The solvent cyclohexane is dehydrated and refined with ethylene (via attached figure 1 The bubbling line of the medium refining solvent tank 8) enters the bubbling replacement from the bottom of the refining solvent tank C for 10 minutes, and then ethylene (via attached figure 1 The medium-refined solvent tank pressure-holding line 7) maintains a pressure of 1.0MPa.

[0091] The catalytic system is a catalyst with five components, namely: chromium acetylacetonate (0.01mol / L), (diphenyl) phosphorus nitrogen (cyclopropyl) phosphorus (diphenyl) (0.02mol / L), methyl Aluminoxane (0.5mol / L), tetrachloroethane (0...

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Abstract

The invention provides a method for oligomerization of ethylene to alpha-olefins and a pretreatment method of a catalyst and a solvent thereof. The invention is applied to a reaction of oligomerization of ethylene to alpha-olefins. Before entering a polymerization reactor, the catalyst and the solvent are conveyed into an enclosed container under the protection of inert gas; and by using ethylenefor purge replacement of the inert gas in the enclosed container and by using ethylene for pressurizing the enclosed container, unreacted ethylene from the oligomerization reaction is subsequently separated and then recycled. By using the raw material ethylene for pressurizing, the problem that accumulation of nitrogen in the reaction system leads to reduction of partial pressure of ethylene is solved; the purposes of increasing catalyst activity and guaranteeing long-period operation of the device and stable catalytic efficiency are achieved; and material loss of the device is also reduced.

Description

technical field [0001] The invention relates to a method for pressure-holding pretreatment of a catalyst and solvent system, which is mainly applicable to the process of ethylene oligomerization to synthesize alpha-olefin. Background technique [0002] α-Olefin is a high value-added chemical raw material, which can be used as a raw material for the production of high-end polyethylene comonomers, high-grade synthetic lubricating oil base oils, and also for the production of fine chemicals such as additives, adhesives, sealants, high-grade plasticizers and detergents. The basic raw material of the product. Among α-olefin products, 1-hexene, 1-octene and 1-decene have the highest added value and demand, and 1-hexene and 1-octene are high-end polyethylene products such as PE-RT and POE The main comonomers of 1-octene and 1-decene are the basic raw materials for the synthesis of high-grade synthetic lubricating oil base oil-PAO. [0003] At present, the production technology of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/30C07C2/36C07C11/02C07C11/107
CPCC07C2/30C07C2/36C07C2531/02C07C2531/04C07C2531/14C07C2531/22C07C11/107C07C11/02Y02P20/52
Inventor 孙淑坤王亚丽王力搏王秀绘曲家波蒋岩马克存于部伟曹媛媛刘通孙恩浩王斯晗徐显明曹婷婷褚洪岭王桂芝魏福成刘龙王凤荣黄付玲刘丽君王玉龙崔凯跃陈谦高晗马立莉徐婷婷霍宏亮孙维王紫东
Owner PETROCHINA CO LTD
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