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Condensation and cooling combined gas-phase fluidized-bed polymerization method and apparatus

A technology of gas-phase fluidized bed and polymerization method, which is applied in the field of gas-phase ethylene polymerization fluidized bed reactor to achieve high yield, and can solve the problems of hindering the fluidization of resin powder, uneven temperature distribution, and inconvenient maintenance of equipment, etc. problems, to achieve the effect of improving the heat removal capacity, increasing the expansion margin, and reducing the degassing requirements

Inactive Publication Date: 2003-08-27
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the method of largely adopting the inner / outer cooling surface also brings technical problems
For example, when setting the cooling surface outside the reactor wall, it may cause uneven temperature distribution on the cross-section inside the reactor, resulting in affected product performance
When designing the inner cooling surface of the reactor, due to setting too many heat exchange tubes, it may hinder the fluidization of the resin powder in the reactor, easily cause dead angles inside the reactor, and cause inconvenient maintenance of equipment

Method used

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  • Condensation and cooling combined gas-phase fluidized-bed polymerization method and apparatus
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  • Condensation and cooling combined gas-phase fluidized-bed polymerization method and apparatus

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Embodiment

[0023] Under the conditions of conventional high-activity Z-N catalyst, the polymerization of ethylene and butene is carried out, the polymerization pressure is 2.069MPa, the polymerization temperature is 88°C, the space-time yield of the reactor is 100kgPE / hr·m3, and the linear low-density polyethylene resin is produced. Suppose the target production intensity of the reactor is 200% of the design value, STY=200kg / m3hr. It is found that under the condition of a certain amount of heat dissipation (i.e. 200% load), the amount of condensate (hexane and isopentane) required for the production of conventional condensation is 0.075 and 0.060, respectively, and the required condensate is produced by composite technology. The amount of liquid (hexane and isopentane) is 0.047 and 0.018 respectively, and the concentration of isopentane (or normal hexane) in the recycle gas can be reduced by 50%. It can be seen that the required condensate (hexane and isopentane) is produced by composite ...

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Abstract

The invention discloses a gas-phase fluid bed polymerizing method combining condensation and cooling and the equipment. Inside or outside the reactor, adopt the combination of the cooling and condensing-state evaporation to remove reaction heat, the heat percentage of condensation / cooling is 65-75%. The temperature range of cooling medium is 0-50 deg.C. It improves the ability of the reactor to remove heat.

Description

technical field [0001] The invention relates to a gas-phase fluidized bed polymerization method and device combining condensation and cooling, which is characterized in that the conventional condensation and evaporation technology of the gas-phase polymerization reactor is combined with the internal / external cooling technology of the reactor, and the exothermic heat of the polymerization reaction is removed synergistically , to achieve high yields in gas phase polymerization reactors, especially for gas phase ethylene polymerization fluidized bed reactors to achieve high yields. [0002] More specifically, the present invention organically combines two known technologies (conventional condensation and evaporation technology and reactor internal and external cooling technology) through the method of optimal configuration, so as to increase the polymer output, expand the production range of product grades, and improve for operational security purposes. ...

Claims

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Application Information

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IPC IPC(8): C08F2/34
Inventor 阳永荣王靖岱黄杏冰陈纪忠胡晓萍杨平身
Owner CHINA PETROLEUM & CHEM CORP
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