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Parallel liquid polypropylene production method and application thereof

A production method and liquid-phase propylene technology, applied in the field of olefin polymerization, can solve the problems of increasing the difficulty of equipment reconstruction and construction, etc.

Active Publication Date: 2018-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of these increase the difficulty of device reconstruction and construction.

Method used

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  • Parallel liquid polypropylene production method and application thereof
  • Parallel liquid polypropylene production method and application thereof
  • Parallel liquid polypropylene production method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Embodiment 1: the polypropylene production method that two Hypol process production lines are connected in parallel

[0087] This embodiment adopts two parallel Hypol process production lines to produce polypropylene, and its flow chart is as follows image 3 shown. The prepolymerization of propylene adopts the continuous liquid phase bulk prepolymerization method. The pre-polymerization reactor 101 is a vertical stirred tank reactor, and a multi-layer inclined paddle stirrer is used to mix the materials in the tank evenly and enhance heat transfer. The heat of polymerization was withdrawn by the cryogenic liquid propylene feed and chilled water in the jacket of the prepolymerization reactor. Among them, the low-temperature liquid propylene is the propylene in the propylene delivery pipeline 1001 that is cooled to 5°C by the heat exchanger 102, and then divided into two streams. The propylene through the pipeline 1021 goes to the prepolymerization reactor 101, and the...

Embodiment 2

[0090] Embodiment 2: the polypropylene production method that two Spheripol process production lines are connected in parallel

[0091] This embodiment adopts two parallel Spheripol processes to carry out polypropylene production, and its flow chart is as follows Figure 4 shown. 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 . The propylene feed enters the propylene cooler 102 through the pipeline 1001, and enters the main reactor of the production line through the pipeline 1002 for polymerization. Among them, the low-temperature liquid propylene is the raw material propylene in the propylene transportation pipeline 100...

Embodiment 3

[0096] Embodiment 3: the polypropylene production method that two Spheripol process production lines are connected in parallel

[0097] This embodiment adopts two parallel Spheripol processes to carry out polypropylene production, and its flow chart is as follows Figure 5 As shown, the two production lines each have independent prepolymerization reactors, respectively A101 and B101, and are in mutual standby state. Prepolymerization conditions were the same as in Example 2.

[0098] The two polypropylene production lines each have an independent prepolymerized material distribution system, which is the same as that in Embodiment 1. The multi-channel switching valve groups in the pre-polymerized material distribution system on the two production lines are four-way ball valves A103 and B103 respectively, and the multi-channel switching valve groups on the two production lines are all in the stop switching state and do not perform periodic switching. Both polypropylene product...

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Abstract

The invention relates to a liquid process polypropylene production method. The method comprises the following steps: A, mixing and reacting a polypropylene catalyst with liquid propylene in a prepolymerization reactor to obtain a propylene prepolymer; B, dividing the prepolymer into multiple material flows in a prepolymer distribution system according to a predetermined ratio, and allowing the multiple material flows to respectively enter multiple downstream production line reactors, wherein the prepolymer contains the active catalyst and liquid propylene with the propylene prepolymer, obtained in step A; C, carrying out a propylene homopolymerization or copolymerization reaction in a liquid propylene medium in the multiple downstream production line reactors to obtain a polypropylene product; and optional D, continuously carrying out the propylene homopolymerization or copolymerization reaction on the polypropylene product in a gas phase or a liquid phase. The method can effectively reduce the investment for the construction of multiple liquid bulk polypropylene process production lines and improve the running stability.

Description

technical field [0001] The invention belongs to the technical field of olefin polymerization, and in particular relates to a parallel liquid-phase polypropylene production method and its application. Background technique [0002] As the world's demand for polyolefins, especially polypropylene, continues to increase, petrochemical plants producing polypropylene have repeatedly expanded production, gradually forming a situation where a single plant has multiple production lines. With the increase of ethylene production scale in new plants, the scale of by-product propylene also increases accordingly. For example, a new 800,000-ton-per-year ethylene plant usually needs to be equipped with a 400,000-500,000-ton-per-year polypropylene plant, and many factories will also choose to build two polypropylene production lines. [0003] Polypropylene has a variety of production processes, and the different production processes are mainly reflected in the use of different reactors. For...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/06C08F2/04C08F2/02C08F2/01
CPCC08F10/06C08F2/04C08F2/02C08F2/01Y02P20/52
Inventor 杨芝超刘旸陈江波于鲁强宋文波杜亚锋
Owner CHINA PETROLEUM & CHEM CORP
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