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Polyethylene induced condensing agent

A condensing agent and polyethylene technology, applied in the field of polyethylene manufacturing, can solve the problems of no special requirements, low reactor output, high product volatility, etc., to ensure safety and reliability, low unit consumption, and strong heat removal effect of ability

Inactive Publication Date: 2009-12-30
广州赫尔普化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the process design, there is no special requirement for the content of isopentane in the condensing agent. From the analysis of the principle of condensation, the content of isopentane has no real benefit to the condensation operation. Although some domestic polyethylene plants currently use 95% isopentane C5 is used as a refrigerant, which is actually caused by the production process of the refrigerant supplier, so the current use of induced condensing agents is far from meeting the actual requirements of the industry, that is, the current ability of the induced condensing agent to remove heat Low, high product volatility, difficult recovery, large unit consumption, high cost, and low reactor output

Method used

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  • Polyethylene induced condensing agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Under the premise that the content of the sum of n-pentane and isopentane in the polyethylene induced condensing agent of the present invention is greater than or equal to 95%, its composition is calculated by weight percentage:

[0036] n-Pentane 57.4%

[0037] Isopentane 38.2%

[0038] Unsaturated hydrocarbons less than 25ppm

[0039] Other hydrocarbons balance

[0040] Moisture less than 20ppm

[0041] Add the induced condensing agent at the inlet of the reaction circulating gas cooler, and after being cooled by the circulating cooler, control the outlet temperature of the circulating cooler below the dew point of the circulating gas, so that it can entrain 2% to 20% liquid and return to the reactor. Vaporization in the reactor, the circulating gas will not affect the stability of the fluidized bed after entering the fluidized bed reactor, the reactor is running smoothly, and all indicators are within the control range. The degassing of the system is the degassin...

Embodiment 2

[0043] Basically the same as in Example 1, except that the normal pentane calculated by weight percentage is 70%, and isopentane is 25%.

Embodiment 3

[0045] Basically the same as in Example 1, except that the normal pentane calculated by weight percentage is 25%, and isopentane is 70%.

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PUM

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Abstract

The invention relates to a polyethylene induced condensing agent and relates to the falling temperature technique in a gas-phase fluidized bed reactor in polyethylene production techniques; the disclosed induced condensing agent comprises 25%-70% of n-pentane by weight percent, 25%-70% of isopentane by weight percent, less than 20ppm of water, less than 30ppm of unsaturated hydrocarbons and the balance other hydrocarbons. The induced condensing agent of the invention can be used in polyethylene reaction recycle gas and has the advantages of strong heat-removing ability, low volatility, easy recovery, low consumption rate, low cost, high reactors yield and good safety.

Description

technical field [0001] The invention relates to polyethylene manufacturing technology, in particular to the temperature-lowering technology in a gas-phase method fluidized bed reactor. Background technique [0002] The ethylene polymerization reaction is an exothermic reaction. The huge heat generated by ethylene polymerization in the gas-phase fluidized bed reactor is carried out by the circulating gas, and then passes through the circulating gas cooler to form a dynamic heat balance. Therefore, in order to increase the space-time yield of the reactor, the ability to remove the heat of polymerization reaction must first be considered. To increase the output of the reactor, the heat of polymerization will be increased accordingly. Once the heat generated by polymerization exceeds the limit, it will be As a result, the temperature of the bed layer cannot be controlled. For this reason, some manufacturers have adopted the ability to increase the temperature of the circulating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/10C08F10/02C08F2/34
Inventor 张官云肖兴
Owner 广州赫尔普化工有限公司