Gas phase method fluidized bed on-line catalyst switching method

A catalyst and fluidized bed technology, applied in the field of gas-phase fluidized bed ethylene polymerization, can solve problems such as low switching efficiency, and achieve the effects of improving utilization rate, accelerating consumption and reducing ethylene waste

Inactive Publication Date: 2017-05-24
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This traditional method with low switching efficiency and severe loss needs to be optimized urgently

Method used

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  • Gas phase method fluidized bed on-line catalyst switching method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] On-line switching between chromium-based catalysts and metallocene catalysts for an ethylene production system, the implementation steps are as follows:

[0033] 1) Close the hydrogen feed at the hydrogen feed port 7 of the reaction system 3 days in advance, and slowly consume the hydrogen in the entire reaction system;

[0034] 2) Stop feeding the chromium-based catalyst, and recover the chromium-based catalyst in the catalyst feeder 2;

[0035] 3) Purging the catalyst delivery and return pipeline connected to the catalyst feeder 2 and the catalyst feeder 2 in a pulsed manner for 20 minutes with water and purified nitrogen at an air pressure of 0.7 MPa with an oxygen content below 0.1 ppm;

[0036] 4) Maintain the original process conditions of Reactor 1, and continue to consume the original chromium-based catalyst in the bed of Reactor 1. As the consumption progresses, the load in Reactor 1 gradually decreases until the load is so low that Reactor 1 emits circulating ...

Embodiment 2

[0043] On-line switching between chromium-based catalysts and metallocene catalysts for an ethylene production system, the implementation steps are as follows:

[0044] 1) Close the hydrogen feed at the hydrogen feed port 7 of the reaction system 2 to 5 days in advance, and slowly consume the hydrogen in the entire reaction system;

[0045] 2) Stop feeding the original catalyst, and recover the chromium-based catalyst in the catalyst feeder 2;

[0046] 3) Purging the catalyst delivery and return pipelines connecting reactor 1 and catalyst feeder 2 and catalyst feeder 2 in a pulsed manner for 15 minutes with water and purified nitrogen at an air pressure of 0.9 MPa with an oxygen content below 0.1 ppm;

[0047]4) Maintain the original process conditions of Reactor 1, and continue to consume the original chromium-based catalyst in the catalyst bed of Reactor 1 with the residual materials. As the consumption progresses, the load in Reactor 1 gradually decreases until the load is ...

Embodiment 3

[0054] On-line switching between chromium-based catalysts and metallocene catalysts for an ethylene production system, the implementation steps are as follows:

[0055] 1) Close the hydrogen feed at the hydrogen feed port 7 of the reaction system 2 to 5 days in advance, and slowly consume the hydrogen in the entire reaction system;

[0056] 2) Stop feeding the original catalyst, and recover the chromium-based catalyst in the catalyst feeder 2;

[0057] 3) Purging the catalyst delivery and return pipelines connecting reactor 1 and catalyst feeder 2 and catalyst feeder 2 in a pulsed manner for 25 minutes with water and purified nitrogen at an air pressure of 0.1 MPa with an oxygen content below 0.1 ppm;

[0058] 4) Maintain the original process conditions of Reactor 1, and continue to consume the original chromium-based catalyst in the catalyst bed of Reactor 1 with the residual materials. As the consumption progresses, the load in Reactor 1 gradually decreases until the load is...

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Abstract

The invention discloses a gas phase method fluidized bed on-line catalyst switching method belonging to the technical field of gas phase method fluidized bed ethylene polymerization. The gas phase method fluidized bed on-line catalyst switching method is characterized in that the method comprises the following steps: hydrogen feeding is in advance closed, hydrogen in a reaction system is consumed, when in switching, catalyst feeding is stopped, a first catalyst in a catalyst feeder is returned, purified nitrogen is used to completely purge a whole catalyst feeding and conveying system, and then a second catalyst is conveyed. While reactor's primary process conditions are maintained, the first catalyst in a bed layer can be consumed at a lower load; when a cycle gas is discharged in a reactor, the hydrogen in the reactor is replaced by nitrogen to below 250ppm; a small amount of metallocene catalyst is added to the reactor to maintain the reaction at a lower load, and a bed layer is replaced. The gas phase method fluidized bed on-line catalyst switching method can realize switching between different catalyst systems without stopping a machine for bed changing, the switching efficiency is greatly improved, and material energy loss caused by the switching can be reduced.

Description

technical field [0001] The invention relates to a gas-phase method fluidized bed online catalyst switching method, which belongs to the technical field of gas-phase method fluidized bed ethylene polymerization. Background technique [0002] Qilu Plastic Factory needs to adopt the traditional method of shutting down and changing beds to switch production between catalysts of different systems. When switching the catalyst system, the entire production line needs to be stopped to replace the resin in the reactor. After the replacement, it is necessary to re-add the materials of the production line, and at the same time, it is also necessary to re-use inert gases such as nitrogen to purge and remove impurities such as water and oxygen in the system. This method of restarting the production line every time the catalyst production is switched takes a long time, and the energy consumption of materials is high. As the market demand for different catalyst system products changes, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F2/34
Inventor 王者民杨宝柱王洪科李东华王常宝王涛修青博马振兴
Owner CHINA PETROLEUM & CHEM CORP
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