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Process method and system for production of alpha-olefin by oligomerization of selective ethylene

An ethylene oligomerization and process method technology, applied in the production of bulk chemicals, chemical instruments and methods, hydrocarbons, etc., can solve the problems of hindering heat transfer, reducing the flow rate of system materials, increasing the frequency of shutdowns and maintenance costs, etc. Achieve the effect of improving plant efficiency, reducing maintenance costs, avoiding polymer wall hanging and plant downtime

Inactive Publication Date: 2018-03-02
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Likewise, local catalyst concentration gradients in poorly mixed reactors can lead to polymer formation
Polymer buildup increases shutdown frequency and maintenance costs
In addition, polymer coating on the reactor wall or tube wall will reduce the system material flow rate and hinder heat transfer

Method used

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  • Process method and system for production of alpha-olefin by oligomerization of selective ethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] like figure 1 The shown selective ethylene oligomerization system for producing α-olefins includes a high-pressure reactor 4, a raw material device and a catalyst device, and the raw material device and the catalyst device are respectively connected to the high-pressure reactor. The raw material device consists of a mixing tank 1, a compressor 2 and a pressure stabilizing tank 3 which are sequentially connected by pipelines along the gas flow direction. The high-pressure reaction kettle 4 is a stainless steel vessel, and there is a jacket circulating water outside the vessel to provide heating / cooling. The high-pressure reactor 4 is provided with a material circulation pipeline. The feed end of the material circulation pipeline is connected to the bottom outlet of the high-pressure reactor 4, and the discharge end is connected to the top of the high-pressure reactor. The material circulation pipeline follows the fluid flow direction in sequence Two parallel bag filters...

Embodiment 2

[0037] like figure 1As shown, the volume of the high-pressure reactor is 0.5 cubic meters, and the volume of the gas-liquid separator is 0.1 cubic meters. The catalyst and co-catalyst are pre-prepared and dissolved in toluene at a ratio of 1:300, and the solubility of the catalyst is 60 μmol / L (calculated as chromium). The reaction system was replaced with 6MPa nitrogen for more than 3 times, and the pressure was released to 0.1MPa. Inject 180L of catalyst solution into the autoclave through a metering pump, and open the valve at the bottom of the autoclave until the liquid level in the gas-liquid separator reaches 20%. Open the valve at the bottom of the gas-liquid separator, turn on the circulation pump, establish the circulation of the catalyst liquid, and turn on the high-pressure reactor to stir. Increase the opening of the valve at the bottom of the high-pressure reactor and the valve at the bottom of the separator, increase the working efficiency of the circulation pu...

Embodiment 3

[0041] Consistent with Example 1, but when the liquid level in the autoclave reaches 60%, open the discharge port for continuous discharge, control the discharge rate to 45L / h, and control the catalyst solution to continuously feed to high pressure reaction at 22.5L / h in addition in the cauldron.

[0042] In this experimental example, the reaction was carried out for 72 hours, the average activity of the catalyst was 1670Kg oligomer / (mol·Cr·h), and 18.0Kg oligomer could be obtained per hour. The proportion of 1-hexene in the oligomer is about 33%, and the proportion of 1-octene is about 58%.

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Abstract

The invention discloses a process method for production of alpha-olefin by oligomerization of selective ethylene; a high-pressure reaction kettle is externally connected with a material circulation pipeline; the material circulation pipeline is provided with a heat exchanger and a gas-liquid separator; in the synthesis process of alpha-olefin, ethylene is inputted to the high-pressure reaction kettle, alpha-olefin synthesized in the presence of a catalyst and a reaction solvent is dissolved in a solvent in the kettle, and a reaction liquid containing a product flows out from the bottom of thekettle, then has heat exchanged by the heat exchanger, enters the gas-liquid separator and is subjected to gas-liquid separation; gas discharged from the top of the gas-liquid separator flows back toa gas mixing tank, and a liquid is sent back to the high-pressure reaction kettle. The invention also relates to a system implementing the process. Heat generated from the reaction is removed in time,the reaction temperature is steadily controlled, and the activity and the selectivity of the catalyst are improved.

Description

technical field [0001] The invention relates to a preparation process of α-olefins, in particular to a process for producing α-olefins through selective ethylene oligomerization. Meanwhile, the invention also relates to a system for realizing the process. Background technique [0002] α-Olefins are an important class of petrochemicals and are widely used, especially 1-hexene and 1-octene as polyethylene comonomers can significantly improve the tear resistance and environmental stress cracking resistance of polyethylene resins. The preparation of α-olefins by ethylene oligomerization is a current research hotspot. The ethylene oligomerization process is usually obtained by chain growth and chain transfer of ethylene in the presence of an alkylaluminum catalyst (one-step or two-step process), or under the action of an organometallic nickel catalyst (SHOP process). These two types of catalysts generally produce a broad distribution of alpha-olefin products with an even number...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/32C07C11/02B01J8/00
CPCB01J8/0005B01J8/0035B01J8/006C07C2/32C07C2531/22C07C11/02Y02P20/52
Inventor 刘振宇钟向宏梁胜彪李禄建廖定满孙望平宋莎
Owner CHINA PETROLEUM & CHEM CORP
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