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Systems for Controlling Polymerization Reactors

A polymerization reactor and control system technology, applied in the direction of instruments, scientific instruments, chemical instruments and methods, etc., can solve problems such as increased difficulty and complex reactor control

Active Publication Date: 2020-09-25
UNIVATION TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Even within the constraints of routine operation, reactor control is complex, further increasing the difficulty of finding operating conditions that lead to higher production rates

Method used

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  • Systems for Controlling Polymerization Reactors
  • Systems for Controlling Polymerization Reactors
  • Systems for Controlling Polymerization Reactors

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Embodiment Construction

[0081] Described herein are systems and methods for determining a non-stick operating regime ("safe" regime) for a polymerization reactor, and operating a polymerization reactor within a non-stick regime. As used herein, the non-stick operating protocol is indicative of a protocol where resin stickiness is no longer a problem. The method may include developing a model of the non-stick operating regime, which may be integrated into the control system or used on a stand-alone system, to recommend changes in control reaction parameters.

[0082] The parameters used in developing the model for the non-stick operating protocol may be based on values ​​measured during experimental determination of resin tack. For any single target resin, the resin viscosity can be measured as a function of temperature and the equivalent partial pressure of the induced condensing agent (ICA). This can be done, for example, by subjecting the resin to a measured amount of ICA, such as isopentane (iC ...

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Abstract

Methods and systems for controlling a polymerization reactor within a non-stick regime are disclosed. Exemplary methods include measuring parameters of the polymerization reaction, including reactor temperature and induced condensing agent (ICA) concentration within the polymerization reactor. Calculate the equivalent partial pressure of ICA ((P ICA ) equiv ). In the dimension of reactor temperature and ((P ICA ) equiv The operation of positioning the polymerization reactor within the two-dimensional space determined by the ) dimension. The position in said two-dimensional space is compared with the non-stick solution defined in the form of the space between the upper temperature limit (UTL) curve and the lower temperature limit (LTL) curve. The parameters of the polymerization reactor were adjusted to keep the reactor within the non-stick regime.

Description

technical field [0001] This application is a divisional application of Chinese application 201380046454.6. Systems and methods of operating polyolefin polymerization reactors are described herein. The method may include determining a non-stick regime for the polyolefin polymerization reaction to prevent accumulation of material in the reaction, and operating the polyolefin polymerization reactor within the non-stick regime. Background technique [0002] Polyolefin polymers can be produced using gas phase polymerization. In a typical gas phase fluidized bed polymerization process, a gaseous stream containing one or more monomers is passed continuously through a fluidized bed in the presence of a catalyst under reaction conditions. The gaseous stream is withdrawn from the fluidized bed and recycled back into the reactor. The circulating gas stream is heated within the reactor by the heat of polymerization. This heat can be removed in another part of the cycle, for example ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/14G01N11/00
CPCG01N11/14G01N33/442G01N3/22G01N19/00G01N33/44B01J19/0013B01J2219/00051G01N2430/60
Inventor A·S·哈里B·J·萨瓦特斯基D·M·格鲁克乌斯基曹宪一
Owner UNIVATION TECH LLC