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Fluid separation systems and methods

A fluid separation and fluid technology, applied in the field of fluid separation systems

Active Publication Date: 2016-09-14
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, large reactors, including those manufactured today exceeding 3.0m 3 Tubular reactors with a volume or production capacity exceeding 250kta present problems related to the large mass flux of the reactor effluent, which must be quickly discharged from the reactor

Method used

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  • Fluid separation systems and methods
  • Fluid separation systems and methods
  • Fluid separation systems and methods

Examples

Experimental program
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Effect test

Embodiment 1

[0059] A Computational Fluid Dynamics ("CFD") model was developed to simulate the Example separation system in reactor shutdown conditions. The modeled system is 12.08m 3 , which includes a cylindrical vessel with an inner diameter of 2040mm and a vertical fluid outlet with a diameter of 895.25mm. The separation system includes two fluid inlets defined in the inner cylindrical surface of the vessel, one fluid inlet positioned directly above the other, configured to direct fluid flow in a counterclockwise direction tangential to the inner surface. The liquid level in the vessel was 200mm below the lower fluid inlet.

[0060] The model is that the model is based on certain initial boundary conditions of both the input and the output of the separation system. For fluid inlets, use a theoretical inlet tank to model the initial conditions for the shape of a rectangular cuboid. The upstream face of the inlet tank is set as the inlet face, from which the initial boundary condition...

Embodiment 2

[0067] Example 2 had the same conditions as Example 1, with a few exceptions: The fluid inlets were positioned 180 degrees from each other about the central vertical axis of the vessel. The lower fluid inlet is set to deliver 360kg / s while the upper fluid inlet is set to deliver 520kg / s. The fluid outlet diameter increased to approximately 1016mm. Under these conditions, a generally subsonic circulation develops within the vessel, at the outlet of the fluid is a steady state flow and an expanding jet. The separation system is subjected to localized wall pressures of the order of 4 bar at the fluid outlet, 22 bar on the inner surface of the vessel, and up to 40 bar near the fluid inlet.

Embodiment 3

[0068] Embodiment 3 (comparison)

[0069] Example 3 had the same conditions as Example 2, except that the fluid inlets were at the same vertical level. Under these conditions, a general ultrasonic circulation develops within the vessel, with an unsteady flow through the fluid outlet. The separation system is subjected to localized wall pressures of the order of 5 bar at the fluid outlet, 37 bar on the inner surface of the vessel, and up to 50 bar near the fluid inlet.

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Abstract

Systems and methods for separating particles from fluids are provided. The system comprises a vessel with at least two fluid inlets and a fluid outlet wherein one fluid inlet is positioned higher in the vessel than the other fluid inlet. The fluid inlets may be connected to a polymerization reactor and each fluid inlet may be configured to deliver fluid to the vessel from a different zone of the polymerization reactor. During shut-down of a polymerization reactor, reaction mixture is discharged to a separation system where polymer particles are removed from the mixture prior to being released into the atmosphere.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Patent Application Serial No. 61 / 934,075 filed January 31, 2014, the disclosure of which is incorporated by reference in its entirety. technical field [0003] This specification relates to fluid separation systems and methods. More specifically, the present invention relates to systems and methods for separating polymer particles from reaction mixtures in polymerization processes. Background technique [0004] Polymerization reactors convert relatively low-cost olefin monomers (such as ethylene, optionally in combination with one or more comonomers) into valuable polyolefin products (such as polyethylene). [0005] It is well known that the economics of polymer production, including polyethylene production, strongly favor large-scale operations and, therefore, there has been a long standing need to develop reactors of large capacity. However, the operation of large polymeriz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D45/12B01J8/00F04C19/00
CPCB01D45/12B01J8/0055B01J8/008B01J2208/00548B01D21/267B01J19/2415B01J2219/24B04C5/04B04C5/12B04C5/20B04C9/00B04C2009/008C08F110/02
Inventor H·A·拉曼斯P·H·克纳利森P·J·克莱曼斯
Owner EXXONMOBIL CHEM PAT INC
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