Ethylene oligomerization method

A technology of ethylene oligomerization and ethylene, which is applied in the direction of addition of unsaturated hydrocarbons to hydrocarbons, organic chemistry, etc., can solve the problems of high polymers hanging on the wall that are difficult to clean up and affect production efficiency, so as to facilitate processing, improve production efficiency, The effect of improving productivity

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for ethylene oligomerization reaction, which solves the problems that it is difficult to clean up high polymers hanging on the wall during the ethylene oligomerization reaction process and affects production efficiency by making the reaction proceed in a reactor equipped with an inner kettle body

Method used

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Embodiment 1

[0019] Such as figure 1 As shown, the inner kettle body 2 is placed in the reaction kettle 1 at first. The reaction solvent toluene was placed in the inner kettle body 2, the reaction temperature was set at 30° C., and the reaction pressure was 3.0 MPa. When the solvent is preheated to the set temperature, the mass space velocity is 30 ~ 60g h -1 Feed the reaction raw material ethylene to carry out the reaction. After reacting for 30 minutes, stop heating to terminate the reaction, open the reactor, and tilt the reactor so as to discharge the reaction solution.

[0020] Reload the reaction solvent in the inner kettle body 2, then repeat the above steps to carry out the second reaction. When carrying out to the 5th reaction, it was found that the polymer wall on the inner wall of the inner still body 2 was thicker, and at this time, the extractor 20 ( figure 2 ) Take out the inner kettle body. Such as figure 2 As shown, the extractor 20 includes at least two grasping ro...

Embodiment 2

[0024] The specific operation steps are roughly the same as in Example 1, except that the reaction pressure is 5.0 MPa; when the third reaction is carried out, it is found that the polymer wall on the inner wall of the inner kettle body 2 is thicker, and the inner wall is replaced at this time. Kettle body; wash with high-pressure water (operating pressure 70MPa) to make the polymer fall off, collect the fallen polymer, put it in a drying oven and heat it up to 100°C to dry and weigh it. The weight of the polymer is the total weight of the reaction solution 3%, the molecular weight distribution of the polymer is 3500-6000000.

Embodiment 3

[0026] The specific operation steps are roughly the same as in Example 1, except that the reaction solvent is heptane; when the third reaction is carried out, it is found that the polymer wall on the inner wall of the inner still body 2 is thicker, and the inner still is replaced at this time body; wash with high-pressure water (operating pressure 55MPa) to make the polymer fall off, collect the fallen polymer, put it in a drying oven and heat it up to 100°C to dry and weigh it. The weight of the polymer is the total weight of the reaction solution. 3.5%, the molecular weight of the polymer is 2500-6000000.

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Abstract

The invention relates to an ethylene oligomerization method. The method comprises the following steps: (a) placing an inner kettle in a reactor, wherein the outer wall of the inner kettle is matched with the inner wall of the reactor; (b) adding a reaction solvent into the inner kettle, setting the reaction temperature to be 0 to 40 DEG C, controlling the reaction pressure to be in a range of 0 to 6 MPa through a pressure reducing valve; (c) introducing an ethylene-containing raw material flow into the reaction solvent to carry out reactions; (d) stopping the reaction, and discharging the reaction fluid. When wall hanging in the inner kettle reaches a certain degree, the inner kettle can be rapidly exchanged, thus next reaction can be carried out immediately, the reactors with the wall hangings do not need to be washed during the industrial production process, a lot of time and labor are saved, time and cost are reduced, and the production efficiency is improved. Nonconventional high-efficient method can be conveniently used to wash the polymers in the wall hangings in the replaced inner kettles, the method utilizing a large amount of solvent to wash the polymer is abandoned, and thus the solvent consumption is greatly reduced.

Description

technical field [0001] The invention relates to the field of olefin oligomerization, in particular to a method for ethylene oligomerization. Background technique [0002] In the ethylene oligomerization reaction, under the action of the catalyst system, the raw material ethylene is oligomerized in a solvent. Due to the action of the catalyst, in addition to the formation of the target product during the ethylene oligomerization reaction, a certain amount of high molecular weight polyethylene by-products will be produced along with the occurrence of side reactions. These high-molecular-weight polymers are not easy to dissolve, and gradually adhere to the inner wall of the reactor to form thicker and thicker polymer layers. This phenomenon is the so-called wall-hanging phenomenon of reactor polymers. The attached polymer layer will not only affect the heat transfer of the reaction, but also adsorb the catalyst components, which will further trigger side reactions and produce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/02C07C2/08
Inventor 张立超吴红飞韩春卉栗同林祁彦平刘珺
Owner CHINA PETROLEUM & CHEM CORP
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