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An apparatus and method for degassing polymer powder

A degassing device, polymer technology, applied in the field of polymer powder degassing, can solve the problem of loss of flushing gas, etc.

Inactive Publication Date: 2009-03-11
TOTAL RES & TECH FELUY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with these devices is that a certain amount of flushing gas (i.e. nitrogen) is also brought along with the polymer powder to the outlet of the degassing chamber and when this residual flushing gas is sent to the gas discharge line, up to 50 % flushing gas

Method used

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  • An apparatus and method for degassing polymer powder
  • An apparatus and method for degassing polymer powder
  • An apparatus and method for degassing polymer powder

Examples

Experimental program
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Effect test

Embodiment 5

[0070] Examples 5 and 6 show the effect of reinjection of nitrogen under the polymer powder in the chamber. According to Figure 5 For the system shown in the middle part, the nitrogen gas is at a distance h of about 70% of the height H 2 and about 50% of the largest diameter L of l 1 , is reinjected into the middle of the purge tower. It can be seen that, when looking at Example 5, if the nitrogen flow to the purge tower is lower than in Comparative Example 1 (200 kg / h vs. 300 kg / h), all other conditions remaining the same, the powder in the purge tower The amount of hydrocarbons at the outlet remained the same as in Example 1. This clearly shows that with less nitrogen it is possible to have the same amount of hydrocarbons at the powder outlet of the purge column.

[0071] In Example 6, the amount of delivery gas required was only half that of Example 5, because the halved delivery pressure required only half the nitrogen to rebalance the pressure in the nitrogen recycle...

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Abstract

The present invention relates to an apparatus for degassing polymer powder comprising a chamber having a first end and a second end opposite to each other, said chamber being equipped with at least one powder inlet and at least one gas outlet at the first end and with at least one powder outlet and at least one gas inlet at the second end, and a valve provided with a powder entry and a powder exit and arranged at the powder outlet of said chamber. The apparatus is characterised in that said chamber is equipped with a gas line joining a gas exit of the valve to the inside of the chamber at a position that is at a distance h2 from the first end (20), said distance h2 being 20-70% of the height H of the chamber and at a distance l1 from a wall of said chamber, said distance being l1 5-50 % of the largest diameter L of the chamber. The invention also relates to a method for degassing polymer comprising flushing the polymer powder in a chamber with a flow of flushing gas, wherein at least a part of flushing gas exiting the chamber through a powder outlet is re-introduced into said chamber.

Description

technical field [0001] The invention relates to a polymer powder degassing device comprising a valve and a chamber having a first end and a second end opposite each other, said chamber being fitted at said first end with at least one powder inlet and at least one a gas outlet and at least one powder outlet and at least one gas inlet at said second end, said valve having a powder inlet and a powder outlet and arranged at said powder outlet of said chamber. The invention also relates to a method for degassing polymer powders, comprising flushing polymer powders in a chamber with a flushing gas flow. Background technique [0002] In this specification, the polymerization process means the process for polymerizing at least one monomer, and the polymer manufacturing process is used in the sense of the whole process, including the polymerization process and any further processing, such as degassing, adding Additives, compounding and / or granulation. [0003] During polymerization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B13/00C08F6/00
CPCB29B13/007B29K2023/12B29K2023/06B29B2013/005C08F6/005B29B13/00C08F6/00
Inventor 埃里克·达米
Owner TOTAL RES & TECH FELUY