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Multimodal polyethylene container

A technology of multimodal polyethylene and polyethylene, applied in chemical instruments and methods, other household appliances, chemical/physical/physicochemical processes, etc., can solve the problems of increased raw material consumption costs of hydrogen and ethylene

Active Publication Date: 2022-07-12
THAI POLYETHYLENE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this technology, the raw material consumption costs of hydrogen and ethylene increase due to the conversion of unreacted gases

Method used

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  • Multimodal polyethylene container
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] Example 1 (E1)

[0122] Example 1 was carried out in the same manner as Comparative Example 1, except that the hydrogen removal unit was operated at a pressure of 115 kPa (absolute pressure). The hydrogen residue from the first reactor was removed by 98.0% by weight. Characteristic properties of these multimodal polymers are shown in Table 2. It can be seen that an improvement in stiffness-impact balance is observed when the percentage of hydrogen residue removed is increased compared to the properties of Comparative Example 1 .

Embodiment 2

[0123] Example 2 (E2)

[0124] Example 2 was carried out in the same manner as Comparative Example 1, except that the hydrogen removal unit was operated at a pressure of 105 kPa (absolute pressure). Residual hydrogen from the first reactor was removed to an extent of 99.1% by weight. Operating the hydrogen removal unit at this pressure results in an expanded range of polymer properties. As shown in Table 2, the final melt flow rate of E2 was lower than that of CE1, resulting in an improvement in simply supported beam impact strength while still maintaining the flexural modulus.

Embodiment 3

[0129] Example 3 (E3)

[0130] Example 3 was carried out in the same manner as Comparative Example 3, except that the hydrogen removal unit was operated at a pressure of 105 kPa (absolute pressure). Hydrogen residues from the first reactor were removed to an extent of 98.8% by weight. The polymer obtained by this process operation has a melt flow rate of 0.195 g / 10min (5 kg load), which is lower than that obtained from CE3. As shown in Table 2, compared to the properties of Comparative Example 3, an improvement in stiffness-impact balance was shown as the percentage of residual hydrogen removed was increased.

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Abstract

The present invention relates to a reactor system for a multimodal polyethylene polymerization process, comprising: (a) a first reactor; (b) a hydrogen removal unit disposed between the first reactor and the second reactor, comprising: at least one vessel connected to a pressure reducing device, preferably selected from a vacuum pump, a compressor, a blower, an ejector or a combination thereof, which allows the operating pressure to be adjusted to a pressure in the range of 100-200 kPa (absolute pressure); (c) the second reactor; and (d) the third reactor and its use as a vessel.

Description

technical field [0001] The present invention relates to a reactor system for a multimodal polyethylene polymerization process, a method for producing a multimodal polyethylene composition using said reactor system, a multimodal polyethylene composition obtainable in this way, and Containers made therefrom. Background technique [0002] The demand for polyethylene resin is increasingly being used in various applications. Polymerization process technologies have been developed to support the production of new polymer materials, based on the relatively new plastic requirements for high-performance polyethylene. To balance the processability and physical properties of ethylene copolymers, the development of a multimodal polymerization process was investigated. [0003] In the prior art, multimodal polyethylene polymerization is used to prepare polymers with different molecular weights by producing each resin fraction in separate reactors. Excess hydrogen is used in the reacto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/00B01J19/00B65D83/14B65D83/16C08F2/01C08F2/12C08F2/18C08L23/04C08L23/06
CPCC08F2/00C08F2/01C08F2/12C08F2/18C08L23/06C08L2203/10C08L2205/025C08L2205/03C08L2207/068C08L23/0815B29D22/003C08F110/02C08F210/16C08F2500/18C08F2500/14C08F2500/01C08F2500/05C08F2500/02C08L2314/06C08L2314/02C08L23/04C08F2/14C08F2400/02
Inventor 查特刀·苏克-姆纳沙波恩·苏超-因瓦差里·奇瓦斯里伦格隆瓦拉查德·克洛姆卡莫波恩亚克特·泰提萨克
Owner THAI POLYETHYLENE CO LTD