Improvement of manner for introducing condensation agent into fluidised bed polymerisation reactor and device

A polymerization reactor and fluidized bed technology, which is applied in chemical instruments and methods, chemical/physical processes, etc., can solve problems such as fluidized bed fluid accumulation and streamline density increase, and achieve improved production capacity, strong practical significance and Application value, the effect of avoiding liquid accumulation at the bottom of the fluidized bed

Inactive Publication Date: 2008-10-15
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the content of condensate in the circulating air stream is further increased, it may cause liquid accumulation at the bottom of the fluidized bed
At the same time, the stream enriched with condensate in this patent returns to the fluidized bed reactor only by the kinetic energy obtained from the compressor. If the amount of condensate in the stream increases, the density of the stream increases and returns to the fluidized bed. The kinetic energy required for the reactor also increases

Method used

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  • Improvement of manner for introducing condensation agent into fluidised bed polymerisation reactor and device
  • Improvement of manner for introducing condensation agent into fluidised bed polymerisation reactor and device
  • Improvement of manner for introducing condensation agent into fluidised bed polymerisation reactor and device

Examples

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Effect test

Embodiment 1

[0036] exist figure 1 Linear low density polyethylene (LLDPE) is produced in the fluidized bed polymerization reactor shown. Under the action of the Z-N catalyst system, the polymerization temperature is 85° C., the pressure is 2.1 MPa, and the superficial velocity of the reactor is 0.68 m / s. The circulating gas flow in the pipeline 4 includes hydrogen, nitrogen, methane, ethane, ethylene, hexene and hexane, etc., the pressure is 2.1MPa, and the temperature is 53°C. The circulating gas stream coming out of the condenser 17 contains 20% condensate, the liquid phase is hexene and hexane, and the density is 618.7kg / m 3 , the gas phase density is 28.8kg / m 3 . After separation and enrichment, the content of the condensate in the pipeline 29 can reach 30% of the total content of the condensate in the circulating gas stream, and the stream is sprayed into the fluidized bed from above the distribution plate through the jet pump 24 . In this process, the jet pump uses ethylene with ...

Embodiment 2

[0038] exist figure 1 Linear low density polyethylene (LLDPE) is produced in the fluidized bed polymerization reactor shown. Under the action of the Z-N catalyst system, the polymerization temperature is 80° C., the pressure is 2.1 MPa, and the superficial velocity of the reactor is 0.72 m / s. The circulating gas flow in the pipeline 4 includes hydrogen, nitrogen, methane, ethane, ethylene, and isopentane, the pressure is 2.1 MPa, and the temperature is 53°C. The circulating gas flow from the condenser 17 contains 30% condensate, the liquid phase is isopentane, and the density is 656.3kg / m 3 , the gas phase density is 28.8kg / m 3 . After separation and enrichment, the content of the condensate in the pipeline 29 can reach 50% of the total content of the condensate in the circulating air stream. . In this process, the jet pump uses ethylene with a flow rate of 20 tons / hour, a pressure of 2.7MPa, and a temperature of 25 °C as the power fluid, and the flow rate of the extracted...

Embodiment 3

[0040] exist figure 1 Linear low density polyethylene (LLDPE) is produced in the fluidized bed polymerization reactor shown. Under the action of the Z-N catalyst system, the polymerization temperature is 85° C., the pressure is 2.5 MPa, and the superficial velocity of the reactor is 0.78 m / s. The circulating gas stream in the pipeline 4 includes hydrogen, nitrogen, methane, ethane, ethylene, hexene and hexane, the pressure is 2.5MPa, and the temperature is 53°C. The circulating gas stream coming out of the condenser 17 contains 40% condensate, the liquid phase is hexene and hexane, and the density is 618.7kg / m 3 , the gas phase density is 28.8kg / m 3 . After gravity separation and enrichment, the content of the condensate in the pipeline 29 can reach 70% of the total content of the condensate in the circulating air flow. in the chemical bed. In this process, the jet pump uses ethylene with a flow rate of 35 tons / hour, a pressure of 3.2 MPa, and a temperature of 60 °C as the...

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Abstract

The invention discloses an improvement of introducing the way of a condensing agent into a fluidized bed polymerization reactor and a device thereof. The improvement comprises the following steps that: a circulating airstream is exported from the top of the fluidized bed and is compressed as well as condensed and separated to form a main portion and a small portion rich in condensed fluid, the main portion flows back to the bottom of the fluidized bed, a jet pump is adopted, a reaction feed gas is taken as a power airstream, the condensed fluid with a content occupying 30 to 100 weight percent of the total content of the condensed fluid in the circulating airstream and the reaction feed gas are jetted to the upper part of a gas distributing plate inside the fluidized bed, the power of the jet pump is adopted to draw off the condensed fluid effusion at the bottom of the fluidized bed back to the upper part of the gas distributing plate. The improvement can greatly increase the quantity of the condensed fluid which returns to the fluidized bed reactor from the upper part of the distributing plate and avoids the phenomenon of the effusion at the bottom of the fluidized bed; meanwhile, the reaction feed gas is taken as the power fluid body of the jet pump, the energy inside the system is used comprehensively, the production ability is greatly increased, therefore, the improvement has great operation significance and the application value.

Description

technical field [0001] The present invention relates to a method of introducing a condensing agent into a fluidized bed polymerization reactor and a device thereof, in particular to an improvement of the method of introducing a condensing agent to a fluidized bed olefin polymerization reactor and a device thereof. Background technique [0002] In modern life, polyolefin resins have been inseparable from the basic needs of human beings. From simple packaging bags to complex aircraft components, polyolefin resins are playing an irreplaceable role, especially polyethylene resins, due to their excellent physical and chemical properties. , simple molding and processing and relatively cheap prices, etc., the output and product application consumption are among the best. There are three main methods of producing polyethylene in industry: slurry polymerization, solution polymerization and gas phase polymerization. Among them, the gas-phase polyethylene process has many advantages s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F2/34C08F2/01B01J8/24
Inventor 阳永荣吴文清骆广海王靖岱王树芳韩国栋蒋斌波武锦涛秦伟
Owner ZHEJIANG UNIV
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