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Production device and production process for producing linear alpha-olefin through ethylene selective oligomerization

A production device and selective technology, applied in the production of bulk chemicals, hydrocarbons, hydrocarbons, etc., can solve the problems of difficult long-term continuous operation, low latent heat removal capacity, low reaction temperature, etc., to avoid wall hanging glue And coil bonding oligomer or pipeline blockage, which is conducive to continuous long-term operation and simplifies the effect of separation process

Active Publication Date: 2021-08-10
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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AI Technical Summary

Problems solved by technology

However, this solution has low latent heat removal capacity due to the low-temperature liquid phase feed of ethylene, and most of the heat of reaction still needs to be removed through the jacket and coil, which is prone to problems such as oligomers hanging on the wall and clogging the coil.
[0010] It can be seen that the selective oligomerization of ethylene has the characteristics of low reaction temperature and large heat release. The use of reactor jacket and inner coil has low heat removal efficiency, and oligomer wax is prone to hang on the wall of the kettle, the wall of the heat exchanger and blockage. Pipeline and other issues
And because low-carbon products such as 1-butene and 1-hexene are easy to participate in secondary reactions, it can cause high-carbon olefin by-products C 14 ~C 16 increase, it is difficult to run continuously for a long time

Method used

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  • Production device and production process for producing linear alpha-olefin through ethylene selective oligomerization

Examples

Experimental program
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Effect test

Embodiment 1

[0065] Such as figure 1 As shown, the oxygen content of ethylene after deoxygenation and dehydration treatment is less than 2ppm, and the water content is less than 2ppm. The feed is fed to the recycle gas inlet of the reactor. The ethylene feed rate is 100kg / h, and the oxygen content of the solvent cyclohexane is less than 2ppm after deoxygenation and dehydration pretreatment. , water content is less than 2ppm, feed to the reactor after saturated ethylene, the solvent feed rate is 200kg / h, the cocatalyst modified methyl aluminoxane is mixed with the solvent cyclohexane to prepare a 10wt.% solution and then directly fed to Reactor, the feed rate of the catalytic solution is 1.0kg / h.

[0066] The main catalyst is the chromium complex described in Example 1 of Chinese Invention Patent 202010718125.3, which is prepared into a 1 μmol / mL solution with the solvent cyclohexane and then directly fed to the reactor. The feed rate of the main catalyst solution is 8.0 kg / h. The regulato...

Embodiment 2

[0084] Refer to Example 1 for the device for selective oligomerization of ethylene. Catalyst selection CN201910966821.3 PNP-type ligands, chromium acetylacetonate complexes and their proportions used in Example 1.

[0085] After ethylene is deoxygenated and dehydrated, the oxygen content is less than 2ppm, and the water content is less than 2ppm. The feed rate of ethylene is 180kg / h, the solvent methylcyclohexane is pretreated by deoxygenation and dehydration, and the oxygen content is less than 2ppm, and the water content is less than 2ppm, and it is directly fed to the tank reactor. The aluminoxane and the solvent methylcyclohexane are mixed and formulated into a 10wt.% solution, and then directly fed into a reaction kettle, and the feeding amount of the catalytic solution is 1.5kg / h. The main catalyst acetylacetonate and the PNP ligand are mixed according to 1:2, and the solvent methylcyclohexane is used to prepare a solution of 1 μmol / mL and then directly fed to the react...

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Abstract

The invention provides a production device and a production process for producing linear alpha-olefin through ethylene selective oligomerization, and belongs to the technical field of homogeneous catalysis. The device comprises a raw material pretreatment unit, a reaction unit and a separation unit, the reaction unit comprises a reaction kettle, a circulating fan, a primary condenser, a primary condensate tank, a secondary condenser and a secondary condensate tank which are sequentially communicated, and the primary condensate tank is communicated with the separation unit; the secondary condensate tank is communicated with a reaction kettle; a temperature sensor is arranged in the reaction kettle, a gas regulating valve is arranged between the primary condenser and the circulating fan, the gas regulating valve and the temperature sensor are interlocked, and the opening degree of the regulating valve is controlled through the temperature of the reaction kettle. The process and the device are mainly used for an ethylene oligomerization process, and have the characteristics that the activity of the catalyst is promoted to be improved, the selectivity of linear alpha-olefin is improved, the secondary reaction degree in which the product participates is low, high-carbon byproducts are few, and the reaction heat removal capability is strong.

Description

technical field [0001] The invention belongs to the technical field of homogeneous catalysis, and in particular relates to a production device and a production process for the selective oligomerization of ethylene to produce linear alpha-olefins. Background technique [0002] With the continuous development of the global economy and the requirement for high-performance synthetic materials, advanced linear α-olefins such as 1-butene, 1-hexene, 1-octene and 1-dodecene are used in high-performance polyolefins, high-end The application of synthetic lubricating oil, high carbon alcohol and other fields continues to increase, and its demand continues to grow. Ethylene oligomerization is one of the main methods to produce high-purity advanced linear α-olefins. Among them, ethylene selective oligomerization has the characteristics of high catalytic activity, high selectivity of target products and good atom economy. It is the current high-purity linear α-olefin. The main production...

Claims

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Application Information

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IPC IPC(8): C07C11/107C07C11/02C07C2/32C07C2/36
CPCC07C2/32C07C2/36C07C11/107C07C11/02Y02P20/52
Inventor 姜涛范昊男
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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