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Method for preparing polypropylene

A polypropylene and propylene technology, applied in the field of polypropylene preparation, can solve the problems of the influence of copolymerization performance, excessive emptying, small pressure difference in the reactor, etc., and achieve the effects of increasing production load, flexible feeding and wide hydrogen adjustment range

Inactive Publication Date: 2014-12-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the reaction system of four reactors in series has uniform reaction, good particle shape, and flexible hydrogen adjustment, its shortcomings are also obvious. Four reactors are connected in series, and the pressure is in a decreasing trend , the temperature and pressure of the last three kettles are limited by the pre-reactor, and the pressure difference between the reactors is small, which increases the difficulty of process operation and is not conducive to the development of new products
In addition, the polymerization time of the four-pot process is long, the activity of the catalyst in the gas phase reactor is affected, the emptying is more, the unit consumption is higher, and the copolymerization performance is also affected

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0035] figure 1 Under the liquid-phase tank parallel flow shown in the figure, TK catalyst, triethylaluminum and methylcyclohexyldimethoxysilane are added in proportion to liquid-phase stirred reactor D201 and liquid-phase stirred reactor D202, Al / Si / Ti is 80 / 5 / 1. The polymerization conditions are as follows: the reaction temperature in the liquid phase stirred reactor D201 and the liquid phase stirred reactor D202 are both 70°C, the reaction pressure is 3.0 MPa, and the catalyst is averaged in the liquid phase stirred reactor D201 and the liquid phase stirred reactor D202. Stay for 30 minutes each; the reaction temperature in the gas-phase fluidized bed reactor D203 is 80°C, the reaction pressure is 1.8MPa, and the residence time of the catalyst is 60 minutes; the reaction temperature in the gas-phase fluidized bed reactor D204 is 70°C, and the reaction pressure is is 1.4MPa, and the catalyst residence time is 65 minutes. The gas-phase hydrogen concentration in the liquid-...

Embodiment 2

[0037] figure 1 Under the liquid-phase tank parallel flow shown in the figure, the TK catalyst, triisobutylaluminum and isobutyltriethoxysilane are respectively added in proportion to the liquid-phase stirred reactor D201 and the liquid-phase stirred reactor D202, Al / Si / Ti is 80 / 5 / 1. The polymerization conditions are as follows: the reaction temperature in the liquid phase stirred reactor D201 and the liquid phase stirred reactor D202 are both 70°C, the reaction pressure is 3.0 MPa, and the catalyst is averaged in the liquid phase stirred reactor D201 and the liquid phase stirred reactor D202. Stay for 30 minutes each; the reaction temperature in the gas-phase fluidized bed reactor D203 is 80°C, the reaction pressure is 1.8MPa, and the residence time of the catalyst is 60 minutes; the reaction temperature in the gas-phase fluidized bed reactor D204 is 70°C, and the reaction pressure is is 1.4MPa, and the catalyst residence time is 65 minutes. The gas-phase hydrogen concentr...

Embodiment 3

[0039] figure 1 Under the parallel flow of liquid phase tanks shown, add TK catalyst in liquid phase stirred reactor D201, add ND catalyst in liquid phase stirred reactor D202, add Cocatalyst triethylaluminum, add external electron donor methylcyclohexyldimethoxysilane in liquid phase stirred reactor D201, external electron donor dicyclopentyl dimethoxysilane in liquid phase stirred reactor D202, two Al / Si / Ti in each liquid phase stirred reactor is 120 / 5 / 1. The polymerization conditions are as follows: the reaction temperature in the liquid phase stirred reactor D201 and the liquid phase stirred reactor D202 are both 70°C, the reaction pressure is 3.0 MPa, and the catalyst is averaged in the liquid phase stirred reactor D201 and the liquid phase stirred reactor D202. Stay for 30 minutes each; the reaction temperature in the gas-phase fluidized bed reactor D203 is 80°C, the reaction pressure is 1.8MPa, and the residence time of the catalyst is 60 minutes; the reaction temperat...

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Abstract

The invention relates to a method for preparing polypropylene. In the presence of a catalyst, a mode that at least two liquid phase stirring reactors are connected in parallel and are connected with a gas phase fluidized bed reactor in series is adopted to perform polymerization reaction of propylene, and the catalysts in the liquid phase stirring reactors comprise main catalysts, auxiliary catalysts and external electron donors. The method provided by the invention is based on the basic principle that liquid phase propylene and gas phase propylene are polymerized, a process that the liquid phase stirring reactors are connected in parallel and are further connected with a gas phase kettle is adopted, and a mode that the main catalysts with different polymerization properties and electron donors with different hydrogen regulation sensitivities are added into the liquid phase kettle, and a mode of differential hydrogen regulation and control, are adopted, so that a polypropylene product with wide molecular weight distribution and novel polypropylene products with excellent property can be developed.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for preparing polypropylene. Background technique [0002] Polyolefin catalysts and process technologies are constantly evolving. At present, the competitive polypropylene production technologies are mainly liquid-phase bulk polymerization method, gas-phase method and the combination technology of the two. The liquid-phase bulk method is mainly used in the production of homopolymers, and the particle shape is controlled by a catalyst prepolymerization method; the production of propylene for impact copolymers adopts the gas-phase method, and the catalyst carrier is used to control the particle shape; the combination of the liquid-phase method and the gas-phase method is Can learn from each other, such as the particle reactor technology of the Spheripol process, Borstar's supercritical technology is the most creative play, the Spherizone process developed by Basell i...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F2/01C08F2/02C08F2/34C08F4/646
Inventor 徐宏彬笪文忠王兴仁梅利胡庆云王翠薇刘克
Owner CHINA PETROLEUM & CHEM CORP
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