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Smooth brand switching method for vapor phase method polyethylene process

A technology of brand switching and gas phase method, applied in chemical instruments and methods, control/regulation processes, chemical/physical/physical chemical processes, etc., can solve problems such as temperature fluctuations in reactors, reduce energy consumption, maintain stable temperature, Reduce the effect of excessive intervention

Pending Publication Date: 2022-05-27
ZHEJIANG UNIV HANGZHOU GLOBAL SCI & TECH INNOVATION CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of the temperature fluctuation of the reactor during the grade switching process of the gas phase polyethylene process

Method used

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  • Smooth brand switching method for vapor phase method polyethylene process
  • Smooth brand switching method for vapor phase method polyethylene process
  • Smooth brand switching method for vapor phase method polyethylene process

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Embodiment Construction

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the protection scope of the present invention. In the following examples, the operation methods without specific conditions are usually in accordance with conventional conditions, or in accordance with the conditions suggested by the manufacturer.

[0034] Gas-phase polyethylene process reaction units and processes such as figure 1 As shown, it mainly includes a reactor 1, a compressor 2, a gas-liquid separator 3, two heat exchangers 4 and other devices. In the polymerization unit, Reactor 1 is a key component of the process. Reactor 1 of this process is a fluidized bed reactor. The high flow rate circulating gas blows the catalyst particles into a fluidized state, and ethylene, hydrogen and comonomers (such as butene, hexene, etc.) u...

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Abstract

The invention discloses a gas phase method polyethylene process stable mark switching method, in the gas phase method polyethylene mark switching process, the change of the opening degree of a valve of an execution mechanism of a reactor temperature control system does not exceed + / -5% by changing process parameters and is matched with PID (Proportion Integration Differentiation) parameters of a controller, so that the temperature of the reactor is stable; and the trademark switching process is smoothly transited. According to the method disclosed by the invention, excessive intervention of operators on the reactor is reduced, the transition time of brand switching is shortened, the generation of transition materials is reduced, the stable operation of a reaction system in the brand switching process is ensured, the energy consumption is further reduced, and the economical efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of gas-phase method polyethylene production, in particular to a method for stable brand switching in a gas-phase method polyethylene process. Background technique [0002] In polyethylene production, according to production planning and external market demand, operators need to adjust process parameters frequently to produce polyethylene products of different grades. Usually, the switching of polyethylene production grades occurs every 2 to 3 days. [0003] The operation level of brand switching reflects the economic benefits and competition level of polyethylene products. A smooth and efficient brand switching operation can not only reduce the production of transition materials, reduce material consumption and energy consumption, and reduce product production costs; it also saves switching adjustment time. , reducing the operation intervention of the operator and improving the stability of the device. [0...

Claims

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Application Information

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IPC IPC(8): C08F210/16C08F210/08C08F2/34B01J19/00B01J4/00B01J8/24B01J8/18
CPCC08F210/16B01J19/0006B01J4/001B01J8/24B01J8/1809B01J8/1836B01J8/1818C08F2400/02B01J2219/00006C08F210/08C08F2/34Y02P90/30
Inventor 廖祖维陈万科洪小东黄正梁杨遥孙婧元蒋斌波王靖岱阳永荣
Owner ZHEJIANG UNIV HANGZHOU GLOBAL SCI & TECH INNOVATION CENT
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