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Propylene copolymer and preparation method thereof

A propylene copolymer and propylene technology, applied in the field of low energy consumption and high ethylene content propylene copolymer and its preparation, can solve the problems of high production raw material consumption cost, low device output, increased transformation cost, etc., to expand production capacity and meet production requirements capacity, heat load reduction effect

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of the low efficiency of the circulation gas heat exchanger in the copolymerization stage, the low output of the device, and the high consumption cost of production raw materials in the prior art when preparing high-ethylene-content propylene copolymers, and to provide a Improve the heat exchange capacity of the circulating gas heat exchanger in the copolymerization stage, reduce energy consumption, and at the same time do not increase the modification cost of the device and the raw material cost of production, and the preparation method of a propylene copolymer with high ethylene content

Method used

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  • Propylene copolymer and preparation method thereof
  • Propylene copolymer and preparation method thereof
  • Propylene copolymer and preparation method thereof

Examples

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preparation example Construction

[0018] The invention provides a method for preparing a propylene copolymer with low energy consumption and high ethylene content. The method adopts gas phase multi-temperature zone technology, and in the presence of a highly active Ziegler-Natta catalyst (Ziegler-Natta catalyst), propylene or propylene The polymerization reaction is carried out with ethylene as an olefin feedstock, and the polymerization reaction is carried out in at least three consecutive polymerization zones of one or more polymerization reactors. Specifically, the method includes the following steps:

[0019] (1) Under the conditions of the gas-phase polymerization reaction of the first olefin or the liquid-phase polymerization reaction condition of the olefin, in the presence of a Ziegler-Natta catalyst, the first olefin raw material is subjected to a polymerization reaction to obtain a first polymerization reaction mixture, wherein the The first olefin raw material is propylene or propylene and ethylene;...

preparation example

[0080] This preparation example is used to prepare the titanium-containing solid catalyst component in the highly active Ziegler-Natta catalyst used in the present invention.

[0081] After fully replacing the 16L pressure-resistant reactor with agitator with nitrogen, add 10L ethanol, 300mL 2-ethylhexanol, 11.2g iodine, 8g magnesium chloride and 640g magnesium powder into the reactor. While stirring, the system was refluxed until no more hydrogen was released. Stop the reaction, wash with 3L ethanol, filter and dry. The resulting dialkoxymagnesium support. The resulting dialkoxymagnesium carrier has a D50 of 30.2um, a span value of 0.81, and an m value of 0.015. Take 650 g of the above-mentioned dialkoxymagnesium carrier and 3250 mL of toluene to prepare a suspension. In a 16L pressure-resistant reactor that has been repeatedly replaced by high-purity nitrogen, add 2600 mL of toluene and 3900 mL of titanium tetrachloride, raise the temperature to 80 ° C, then add the prepa...

Embodiment 1

[0083] This example is used to illustrate the preparation method of the low energy consumption and high ethylene content propylene copolymer of the present invention.

[0084] 1) Raw material

[0085] The titanium-containing solid catalyst component obtained in the preparation example is the main catalyst; Triethylaluminum is used as the cocatalyst; Tetraethoxysilane (T-Doner) is used as the first external electron donor; Propylene, ethylene and hydrogen are Polymerization grade, used after removing water and oxygen, and used after dehydrating hexane.

[0086] 2) Test device

[0087] A polymerization process in which two horizontal tank gas phase reactors are connected in series is adopted. The volume of the horizontal tank gas phase reactor is 0.2 cubic meters, the stirring blade is a T-shaped inclined blade, the inclination angle is 10 degrees, and the stirring speed is 100 rpm.

[0088] 3) Test conditions

[0089] Step (1) gas-phase propylene homopolymerization: Add the...

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Abstract

The invention discloses a preparation method of a propylene copolymer with low energy consumption and high ethylene content. The method disclosed by the invention adopts a gas phase multi-temperature range technology, a second external electron donor is selectively added under the presence of a highly active ziegler-natta catalyst, so that propylene, or propylene and ethylene can perform propylene homopolymerization and copolymerization in at least three continuous polymerization areas of one or more polymerization reactors. The method disclosed by the invention adopts the gas phase multi-temperature range technology, at a low temperature area, most of polymerization activity of the catalyst is ensured, and at a high-temperature area, the heat exchanger efficiency of a heat exchanger is improved; in addition, the second external electron donor is selectively added, and the second external electron donor is matched with a solid catalyst component, containing titanium, of the ziegler-natta catalyst, so that the reactivity ratio of ethylene in the polyreaction can be effectively increased, the high ethylene content of products is ensured, and besides, the concentration of the ethylene in gas phase composition is reduced; therefore, the energy consumption during production is reduced, and the production capacity of the conventional device is reached.

Description

technical field [0001] The invention belongs to the technical field of polypropylene production, in particular to a propylene copolymer with low energy consumption and high ethylene content and a preparation method thereof. Background technique [0002] Impact polypropylene products with high ethylene content have both the rigidity of propylene homopolymer and the impact resistance of ethylene-propylene rubber components, and have a good balance of rigidity and toughness. They have been widely used in automobiles, household appliances and injection-molded containers, etc. field. [0003] Polypropylene with high ethylene content is usually prepared by a multi-step polymerization method. Propylene homopolymerization or random copolymerization is carried out in the first reactor to obtain propylene polymer, which is then sent to the next reactor for copolymerization of propylene and ethylene. The ethylene-propylene random copolymer-based polymer is formed in the pores of the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/06C08F4/649C08F2/34
CPCY02P20/10
Inventor 杨芝超于鲁强刘旸陈江波杜亚锋仝钦宇张雅茹
Owner CHINA PETROLEUM & CHEM CORP
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