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Gas phase method polypropylene production method

A production method and technology of polypropylene, applied in the field of olefin polymerization, can solve problems such as temperature fluctuation, poor heat transfer capacity, and low density of gas phase reaction medium

Active Publication Date: 2019-03-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low density and poor heat transfer capacity of the gas phase reaction medium, problems such as temperature fluctuations and powder agglomeration are likely to occur when the production load of the device is increased.
Therefore, the first gas phase reactor has become the bottleneck restricting the increase of the production capacity of the single production line of the gas phase process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] The 200,000 tons / year Innovene process polypropylene production line adopts double-horizontal gas-phase stirred bed reactors. Its process is based on the existing gas-phase polypropylene production process of Comparative Example 1, adding a liquid-phase bulk pre-polymerization device and a pre-polymerization material distribution system. Its flow chart is as Figure 4 shown.

[0088] The prepolymerization method of propylene is continuous liquid phase bulk prepolymerization. The pre-polymerization reactor 101 is a loop reactor, and the materials in the reactor are moved at a high speed through an axial flow pump to enhance heat transfer. The heat of polymerization is withdrawn by the cryogenic liquid propylene feed and chilled water in the jacket of the prepolymerization reactor 101 . Among them, the low-temperature liquid propylene is the raw material propylene cooled to 10°C by the heat exchanger 102, and then divided into two streams, the propylene passing through...

Embodiment 2

[0093] The 200,000 tons / year Innovene process polypropylene production line adopts double-horizontal gas-phase stirred bed reactors. Based on the existing gas-phase polypropylene production process of Comparative Example 1, the flow process adds a liquid-phase bulk prepolymerization device, a prepolymerization material distribution system, and a pipeline 2012 from the first gas-phase reactor 201 to the deactivation packaging section. Flowchart such as Figure 5 shown.

[0094] The prepolymerization mode, prepolymerization conditions, and prepolymerization material distribution system of propylene are the same as in Example 1. The switching cycle time T of the four-way ball valve set by the program software in the pre-polymerization material distribution system is 6 minutes, and the time T of the A state A is 3 minutes, the time T of state B B for 3 minutes.

[0095] Through the pre-polymerization material distribution system, the pre-polymerization material is divided into...

Embodiment 3

[0102] The 200,000 tons / year Novolen process polypropylene production line adopts double vertical gas phase stirred bed reactors. Its flow process has increased liquid phase bulk prepolymerization device and prepolymerization material distribution system on the basis of the existing gas phase polypropylene production technological process of comparative example 2, and its flow chart is as follows Figure 7 shown.

[0103] The prepolymerization method of propylene is continuous liquid phase bulk prepolymerization. The pre-polymerization reactor 101 is a loop reactor, and the materials in the reactor are moved at a high speed through an axial flow pump to enhance heat transfer. The heat of polymerization is withdrawn by the cryogenic liquid propylene feed and chilled water in the jacket of the prepolymerization reactor 101 . Among them, the low-temperature liquid propylene is the raw material propylene cooled to 10°C by the heat exchanger 102, and then divided into two streams...

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Abstract

The invention relates to a gas phase method polypropylene production method. The gas phase method polypropylene production method comprises, step A, mixing polypropylene catalysts and liquid phase propylene inside a prepolymerization reactor for reaction to obtain a propylene prepolymer; step B, dividing prepolymer materials inside a prepolymer distributing system into multiple flows according toa preset ratio to separately enter into different downstream gas phase reactors connected in tandem, wherein the prepolymer materials are composed of the active catalysts and the liquid phase propylene, which are obtained from the step A and contain the propylene prepolymer; step C, inside the gas phase reactors with the prepolymer materials and in gas phase propylene medium, performing propylenehomo-polymerization or copolymerization to obtain a polypropylene product; optionally, step D, enabling the polypropylene product obtained in the gas phase reactors with the prepolymer materials to subsequently flow through downstream gas phase reactors to continue propylene homo-polymerization and copolymerization inside the gas phase reactors.

Description

technical field [0001] The invention belongs to the technical field of olefin polymerization, and in particular relates to a gas-phase method for producing polypropylene. Background technique [0002] As the world's demand for petrochemical products continues to increase, petrochemical plants and refineries have repeatedly expanded production, and the scale of by-product propylene has also increased accordingly. Under such circumstances, various petrochemical plants have carried out expansion and transformation of polypropylene production equipment, or built new polypropylene production lines. [0003] There are many production processes for polypropylene, and the different production processes are mainly reflected in the different reactors used. For example, the Spheripol process homopolymerization reactor of Basell Company is two loop reactors connected in series, also known as loop polypropylene Process, the gas phase reactor adopts the form of dense phase fluidized bed....

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F110/06C08F2/34C08F2/02C08F2/01
CPCC08F10/06C08F110/06C08F2/34C08F2/02C08F2/01
Inventor 杨芝超张雅茹杜亚锋仝钦宇陈江波
Owner CHINA PETROLEUM & CHEM CORP
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