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A kind of propylene prepolymerization method

A technology of propylene polymerization and pre-polymerization, which is applied in the field of polyolefin polymerization, can solve the problems of high operating costs and large investment in equipment, achieve the effects of low operating costs, solve temperature fluctuations, and improve capacity

Active Publication Date: 2015-09-30
利和知信新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two pre-polymerization processes require low temperature. In the actual application process, refrigeration and heat exchange equipment such as ice machines must be added. The equipment investment is large and the operating cost is high.

Method used

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  • A kind of propylene prepolymerization method
  • A kind of propylene prepolymerization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Pre-polymerization conditions:

[0030] The pre-polymerization reactor is a stirred autoclave with a volume of 2L, and the fresh propylene flow rate is 12.5Kg / hr; the external electron donor adopts CHMDMS (methylcyclohexyldimethoxysilane), and the flow rate is 0.6g / hr; CN200510109095.1 prepared by the method of Example 5) feed rate 1.8g / hr (diluted to 30% white oil slurry); triethylaluminum feed rate 3.6g / hr, the material takes the way of top in and bottom out through the reactor.

[0031] 1) The catalyst, activator, and external electron donor continuously enter the reactor for liquid-phase bulk polymerization of propylene;

[0032] 2) The pre-polymerization temperature is 35°C;

[0033] 3) The pre-polymerization time is 5 minutes;

[0034] 4) The pressure of the polymerization reaction is greater than the saturated vapor pressure of propylene at the prepolymerization temperature, so as to maintain a full tank liquid phase operation.

[0035] The prepolymerization r...

Embodiment 2

[0047] Pre-polymerization conditions:

[0048] The pre-polymerization reactor is a stirred autoclave with a volume of 2L, and the fresh propylene flow rate is 12Kg / hr; the external electron donor adopts DIPDMS (diisopropyldimethoxysilane), and the flow rate is 0.55g / hr; the catalyst (according to CN200510109095 .1 prepared by the method of Example 5) feed rate 1.7g / hr (diluted to 30% white oil slurry); triethylaluminum feed rate 3.6g / hr, the material takes the mode of going in and out through the reactor.

[0049] 1) The catalyst, activator, and external electron donor continuously enter the reactor for liquid-phase bulk polymerization of propylene;

[0050] 2) The pre-polymerization temperature is 40°C;

[0051] 3) pre-polymerization time 3min;

[0052] 4) The pressure of the polymerization reaction is greater than the saturated vapor pressure of propylene at the prepolymerization temperature, so as to maintain a full tank liquid phase operation.

[0053] The prepolymeriza...

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Abstract

The invention provides a propylene pre-polymerizing method. The propylene pre-polymerizing method comprises the following steps of: continuously contacting a propylene polymerizing catalyst, an activator, an external electron donor with propylene in a pre-polymerizing reactor at room temperature, and performing polymerization reaction; and after pre-polymerization, performing liquid phase body or gas phase polymerization on slurry. The propylene pre-polymerizing method is simple in process flow, simple and reliable in process control and low in operating cost and is applicable to gas phase propylene polymerizing processes without a pre-polymerizing process, such as Innovene, Novolen, Unipol and the like; the problems of temperature fluctuation, polymer agglomeration and high fine powder content of polymer powder which frequently occur in the gas phase reaction processes and the like can be solved; and the capability of devices in developing a high value-added polymer with a higher rubber content can be improved.

Description

technical field [0001] The invention relates to a propylene polymerization method, in particular to a propylene prepolymerization method and belongs to the field of polyolefin polymerization. Background technique [0002] At present, the main polypropylene processes for industrial use include: liquid phase bulk method: such as HYPOL process, SPHERIPOL process, SPHERIZONE and other processes; gas phase process: such as INNOVENE process, NOVOLEN process, UNIPOL and other processes. Among them, most of the liquid-phase bulk hair processes adopt a pre-polymerization process, while most of the gas-phase polymerization processes do not have a pre-polymerization process. [0003] By comparing the pre-polymerization process with the non-pre-polymerization process, it can be found that the polypropylene process using the pre-polymerization process, such as HYPOL process, SPHERIPOL process, SPHERIZONE and other processes, has stable polymerization reaction temperature control, no hot ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/06C08F2/02C08F2/34
Inventor 王志武代金松马庆利
Owner 利和知信新材料技术有限公司