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Process for preparing polyolefins by discontinuous addition of thermal runaway reducing agent

A thermal runaway and reducing agent technology, applied in chemical instruments and methods, chemical/physical processes, etc., can solve the problem that the overall productivity is not optimal

Active Publication Date: 2021-03-02
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The inventors of the present invention have observed that in these prior art methods the overall productivity is not optimal

Method used

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  • Process for preparing polyolefins by discontinuous addition of thermal runaway reducing agent
  • Process for preparing polyolefins by discontinuous addition of thermal runaway reducing agent
  • Process for preparing polyolefins by discontinuous addition of thermal runaway reducing agent

Examples

Experimental program
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specific Embodiment

[0133] There are several different situations in which the addition of a TRRA may be required, each discussed in more detail below.

[0134] The so-called increase in skin temperature

[0135] In a first embodiment (Example A), the invention relates to a process for the continuous production of polyolefins from one or more alpha-olefin monomers in a reactor system comprising:* A reactor comprising at least a lower part, a middle part and an upper part, - wherein a distribution plate and an inlet for a recirculation flow below said distribution plate are located at the lower part of said reactor; - a fluidized bed, an inlet for polymerization catalyst, an outlet for polyolefin, a plurality of temperature sensing devices for measuring the temperature of the inner wall of said reactor are located in the central part of said reactor (middle of said reactor); and - an outlet for fluid is located at The upper part of the reactor, * a heat exchanger; * a first connecting means conne...

example

[0156] The effect of discontinuous addition of TRRA is demonstrated by the following non-limiting example. Titanium-containing Ziegler-Natta catalyst composition for the production of polypropylene homopolymer, said catalyst composition comprising diisobutyl phthalate as internal donor and methylcyclohexyl as external electron donor Dimethoxysilane (C-donor). A fluidized gas phase reactor is operated to produce polypropylene homopolymer with high static and skin activity. The polymerization rate was reduced to less than half the normal production rate of 22 TPH (tons per hour) to control skin activity and improve reactor stability. Ethyl p-ethoxybenzoate (PEEB) was then dosed into the reactor bed at a ratio to the catalyst feed rate, which was further controlled by monitoring catalyst activity and skin activity.

[0157] It is seen that with the gradual addition of PEEB, the catalyst activity decreases proportionally and also the skin activity indicated by hot spots starts t...

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Abstract

The present invention relates to a process for the continuous production of polyolefins from one or more alpha-olefin monomers in a reactor system, said process for the continuous production of polyolefins comprising the steps of; The inlet of the catalyst is fed into the fluidized bed; + the one or more monomers are fed into the reactor, + the one or more monomers are polymerized in the fluidized bed to produce said polyolefin; + withdraw the formed polyolefin from said reactor through the polyolefin outlet; + withdraw the fluid from said reactor through the fluid outlet and convey said fluid through the first connection means, a heat exchanger to cool the fluid to produce a cooled recycle stream, and return to the reactor via a second connection means via the inlet of the recycle stream; Add Thermal Runaway Reducing Agent (TRRA).

Description

Background technique [0001] The present invention relates to a process for the continuous preparation of polyolefins from one or more alpha-olefin monomers in a fluidized bed reactor, said process comprising the steps of: mixing a polymerization catalyst and one or more monomers fed into the reactor in which the one or more monomers are polymerized to produce polyolefins; the formed polyolefins are withdrawn from the reactor and allowed to The fluid withdrawn from the reactor is circulated through a heat exchanger to cool the fluid back to the reactor, where a thermal runaway reducing agent (TRRA) is added to the reactor in a discontinuous manner to prevent the reactor from overheating. out of control. [0002] Continuous gas-phase fluidized-bed polymerization processes are known for the preparation of polyolefins. When such processes are carried out in the presence of highly active catalysts, changes in the polymerization process, such as those produced by slight fluctuatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/01C08F2/38C08F10/00
CPCC08F2/38C08F2/01B01J8/24B01J2219/00259C08F10/00B01J2208/00513C08F2/34C08F2500/35C08F10/02C08F10/06C08F110/02C08F110/06B01J2219/00063B01J8/1809C08F4/6545C08F4/6548C08F2400/02B01J2219/00033
Inventor S·K·古普塔M·埃尔-奥菲R·R·库马尔A·阿尔贝尔拉迪
Owner SABIC GLOBAL TECH BV