Polymerization method

A technology of polymerization unit and polymerization reactor, which is applied in the field of polymerization, can solve the problems of large volume of aging kettle, and achieve the effects of reducing labor intensity, realizing self-control and easy self-control

Inactive Publication Date: 2013-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the catalyst preparation section adopts the batch aging method, the amount of catalyst produced by each batch of operation must meet the needs of the polymerization section for a period of time, so the volume of the aging tank used for batch operation is very large, and the catalyst produced by each batch of operation There are different differences in quality

Method used

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Examples

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Effect test

Embodiment 1

[0053] according to figure 1 The flow shown is aggregated:

[0054] (1) Catalyst preparation section: mix isoprene, neodymium naphthenate / cyclohexane solution, diethylaluminum chloride / cyclohexane solution, triisobutylaluminum / cyclohexane solution and solvent cyclohexane Continuously sent to the first fully mixed aging kettle 1 for contact to obtain the first solution, the flow rates were 270g / h, 320ml / h, 120ml / h, 700ml / h, 4650ml / h; The residence time of the material is 50min, and the low-temperature frozen brine is passed through the jacket of the kettle, and the temperature of the kettle is controlled at 10°C;

[0055] The first solution is introduced from the first fully mixed aging tank 1 into the second fully mixed aging tank 2 for the second contact to obtain the second solution; the second solution is introduced from the second fully mixed aging tank 2 Introduce the third fully mixed aging tank 3 for the third contact to obtain the third solution; introduce the third ...

Embodiment 2

[0059] Carry out polymerization according to the method for embodiment 1, difference is, in the step (1), the material feed amount that enters each full-mixing type aging kettle is reduced to original 5 / 6, but the ratio between each material feed flow rate Keep the same as in Example 1, and the residence time of the materials in the first fully mixed aging tank is 60min, and the residence time of the materials in the second, third and fourth fully mixed aging tanks is 6h;

[0060] Simultaneously in step (2), the feed amount of the isoprene that enters the polymerization section premix tank, solvent is also reduced to original 5 / 6, but the ratio between the two remains the same as in Example 1, and The residence time of the materials in the three polymerization reactors was 48 minutes.

[0061] According to this example, the final conversion of isoprene monomer was 93%, the cis 1,4-structure content of the polymer was 98%, and the Mooney viscosity was 80.

Embodiment 3

[0063] Carry out polymerization according to the method for embodiment 1, difference is, in the step (1), the material feed amount that enters each fully mixed type aging tank is reduced to original 5 / 7, but the ratio between each material feed flow rate Keep the same as in Example 1, and the residence time of the materials in the first fully mixed aging tank is 70min, and the residence time of the materials in the second, third and fourth fully mixed aging tanks is 7h;

[0064] Simultaneously in step (2), the feed amount of the isoprene and solvent entering the polymerization section premixing tank is also reduced to the original 5 / 7, but the ratio between the two remains the same as in Example 1, and The residence time of the materials in the three polymerization reactors was 56 minutes.

[0065] According to this example, the final conversion of isoprene monomer was 94%, the cis 1,4-structure content of the polymer was 98.2%, and the Mooney viscosity was 82.

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Abstract

The invention provides a polymerization method. The method comprises the steps of: in the presence of an inertia organic solvent, continuously feeding aluminum alkyl and/or alkyl aluminium hydride, conjugated diene, neodymium carboxylate and a halogen-containing compound into a catalyst preparing unit to contact to obtain a neodymium homogeneous rare earth catalyst; and continuously feeding the conjugated diene, the inertia organic solvent and the neodymium homogeneous rare earth catalyst into a polymerization unit to contact under the conditions of a polymerization reaction. By adopting the polymerization method provided by the invention, a good polymerization effect can be obtained when the catalyst is prepared under normal conditions (for example, the feeding sequence in the catalyst preparing process is not strictly controlled and the operating condition in the catalyst preparing process is not strictly controlled). Furthermore, through carrying out continuous integration on the preparation process and the polymerization process, the polymerization method provided by the invention has the advantages that the production efficiency is improved; the labor intensity is reduced; the operating cost is reduced; the automatic control is easily realized; and the obtained product is stable and uniform in quality.

Description

technical field [0001] The present invention relates to a method of polymerization. Background technique [0002] Isoprene undergoes directional polymerization under the action of a rare earth catalyst to synthesize isoprene rubber with high cis structure content (>96%) and high molecular weight. The isoprene rubber catalyzed by rare earth catalysts is better than that synthesized by titanium catalysts in terms of microstructure and physical mechanical properties, and its microstructure and macroscopic properties are closest to natural rubber. Specifically, isoprene rubber catalyzed by rare earth catalysts has excellent elasticity, sealing, creep resistance, wear resistance, heat resistance and tear resistance, and its tensile strength and elongation are also close to those of natural rubber, so It can be used as a substitute for natural rubber in some cases, and can also be used in combination with natural rubber (NR) or other synthetic rubbers. Due to the above excell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F36/04C08F4/54C08F4/52C08F36/08
Inventor 张国娟张杰尚荣欣李传清梁爱民徐林于国柱谭金枚李巍刘美瑜
Owner CHINA PETROLEUM & CHEM CORP
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