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Continuous feed of antistatic agent for gas phase polymerization process

An antistatic agent and antistatic technology, applied in the field of continuous feeding of antistatic agents used in the gas phase polymerization process, can solve problems affecting the activity of olefin polymerization catalysts, etc.

Pending Publication Date: 2021-09-10
BRASKEM SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, most antistatic agents are known to negatively affect the activity of olefin polymerization catalysts
This limits the amount of antistatic agent that can be used, thus resulting in a compromise between maintaining catalytic activity and effectively preventing solids accumulation in the reactor
[0008] The use of antistatic agents to prepare polymers for food contact applications is further limited by restrictions already imposed by government regulatory agencies such as the European Commission and the U.S. Food and Drug Administration

Method used

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  • Continuous feed of antistatic agent for gas phase polymerization process
  • Continuous feed of antistatic agent for gas phase polymerization process
  • Continuous feed of antistatic agent for gas phase polymerization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The electrical conductivity of a compound is an important property that determines whether a compound can be successfully used as an antistatic agent (or antistatic compound) during polymerization and whether it can compensate for electrostatic charges generated during polymerization. Grindsted PS 432 (Dupont) (referred to herein as "GE") and Triethylaluminum / Grindsted PS432 in ratios of both 1:1 and 10:1 mol / mol were measured using a Digital Conductivity Meter Model 1152 supplied by EMCEE Electronics (TEAL / GE) and the conductivity of mixtures of triisobutylaluminum / Grindsted PS432 (TIBAL / GE).

[0059] GE consists of two main substances: monoester of oleic acid with oxybis(propylene glycol) (CAS No. 49553-76-6); and acetate of monoglyceride (CAS No. 736150-63-3).

[0060] pass 1 H NMR (Agilent 400Mhz, with a DD2 console equipped with a OneNMR probe) studies the complexes of oleic acid monoester with oxybis(propylene glycol) / triisobutylaluminum or oxybis(propylene glyco...

Embodiment 2

[0067] In a fluidized bed gas phase reactor, by using Ziegler-Natta catalyst, triethyl-aluminum (TEAL) as a cocatalyst and cyclohexyl-methyl-dimethoxysilane as an external donor, the In the presence of hydrogen as molecular weight regulator, butene as density regulator, C3-C6 saturated hydrocarbon as inert diluent and Atmer 163 (ethoxylated amine) as antistatic agent, 36 kg / h of high-density polyethylene (HDPE). In the fluidized bed gas phase reactor, the operating conditions in Table 1 are met.

[0068] Table 1: Conditions of Example 2

[0069]

[0070] The total amount of Atmer 163 introduced in the polymerization reactor was 930 ppm by weight based on productivity.

[0071] The resulting HDPE had a melt flow index at 190°C of 12.0 (g / 10 min) and a density at 23°C of 0.952 g / cc. During this polymerization run, a continuous discharge of HDPE was observed and the formation of lumps was prevented.

Embodiment 3

[0073] The high density polyethylene was repeated according to the similar operating conditions of Example 2 to evaluate Grindsted PS432 (acetate ester of monoester / monoglyceride of oleic acid and oxybis(propylene glycol)).

[0074] In a fluidized bed gas phase reactor, by using Ziegler-Natta catalyst, triethyl-aluminum (TEAL) as a cocatalyst and cyclohexyl-methyl-dimethoxysilane as an external donor, the Hydrogen as molecular weight regulator, butene as density regulator, C3-C6 saturated hydrocarbon as inert diluent and Grindsted PS432 (monoester / monoglyceride of oleic acid and oxybis(propylene glycol)) as antistatic agent In the presence of acetate), ethylene is polymerized to produce 36 kg / h of high density polyethylene (HDPE). In the fluidized bed gas phase reactor, the operating conditions of Table 2 are satisfied:

[0075] Table 2: Conditions of Example 3

[0076]

[0077] The total amount of Grindsted PS432 introduced into the polymerization reactor was 650 ppm by ...

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Abstract

Methods may include reacting an antistatic agent with at least one alkylaluminum to form an antistatic complex, and may further include feeding the antistatic complex into a polymerization process. Methods of using an antistatic agent in a polymerization process may include feeding the antistatic agent into the polymerization process and, subsequently, reacting the antistatic agent with at least one alkylaluminum.

Description

Background technique [0001] Gas phase polymerization is a common process for the efficient preparation of various polymers. Specifically, homopolymers of low-carbon olefins such as ethylene or propylene and copolymers of ethylene and / or propylene with C4-C8 α-olefins can be efficiently produced by gas phase polymerization. [0002] Reactors for gas phase polymerisation generally comprise a fluidized bed consisting of polymer particles polymerised in the presence of a gas mixture. It is generally advantageous to have the bed in a fluidized state as this provides an extremely high surface area to maximize contact between the bed and the gas mixture. In addition, a fluidized bed allows thorough mixing of the particle phase and more frequent collisions between polymer particles and between polymer particles and the reactor walls. [0003] However, these frequent particle-particle and particle-wall collisions may lead to the formation of electrostatic charges which may lead to el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F5/06C08F10/00C09K21/06
CPCC07F5/061C08F110/02C08F10/00C08F4/6465C08F2/005C08F210/06C08F210/16C08F2500/12C08F4/6494C08F2/44C08F2/01C08F2/34C08F110/06C08F210/02C08K5/10C08K5/098C08K5/56C07F5/062C08F10/02C08F10/06C08K2201/001
Inventor 奥拉沃·马丁斯尤尼奥尔戴奥真尼斯·阿德里亚诺·波泽尔艾丽塔·卡瓦利阿德里亚诺·吉拉迪·菲什罗伯托·奥索里奥·希门尼斯
Owner BRASKEM SA
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