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Process and system for removing heavies from diluent recycled to a slurry polymerization reactor

A slurry polymerization, reactor technology, applied in chemical instruments and methods, chemical/physical processes, etc., can solve problems such as quality decline and blockage

Inactive Publication Date: 2008-07-16
CHEVRON PHILLIPS CHEMICAL CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, accumulation of heavy components in the reactor can degrade the quality of the product and / or alter the control of the reactor making the reactor problematic and more likely to clog

Method used

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  • Process and system for removing heavies from diluent recycled to a slurry polymerization reactor
  • Process and system for removing heavies from diluent recycled to a slurry polymerization reactor
  • Process and system for removing heavies from diluent recycled to a slurry polymerization reactor

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Embodiment Construction

[0040]The present invention provides a system and method for diluent recovery and purification for slurry polymerization reactors, especially for loop polymerization reactors. The systems and methods described comprise a flash chamber or flash gas separator, a vapor removal line, a condenser and a liquid collection tank. The flash chamber or flash gas separator receives the slurry withdrawn from the loop reactor. Diluent, unreacted monomer and various heavies are separated from the solid polymer particles as a first vapor stream. The vapor removal line receives the first vapor stream and sends a first portion to a condenser to condense at least a portion of the first portion to form a first liquid. It is a relatively small fraction, eg about 2%, of the condensed first vapor stream. A second portion of the first vapor stream bypasses the condenser and thereafter combines and mixes with the first liquid to form a combined stream. The combined streams are sent to a liquid coll...

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Abstract

A recycling and recovery system and process comprising a flash gas separator (18) that receives a slurry comprising liquid medium and solid polymer particles (52). The flash gas separator (18) separates the diluent from the solid polymer particles as a vapor stream comprising at least diluent and heavies. A line receives the vapor stream (56) from the flash gas separator. The line leads to a heavies removal system (20) that yields a liquid that is relatively concentrated in heavies and a diluent vapor that is relatively free of heavies. The liquid is passed to a heavies column (32), while the diluent vapor is passed to a diluent recycle chamber (30) and then recycled to a slurry polymerization reactor (10) without additional treatment to remove heavies.

Description

[0001] related application [0002] This application is related to and claims priority to U.S. Patent Provisional Application 60 / 411,254, filed September 16, 2002, entitled "Method and System for Removal of Heavies from Diluent Circulated to a Slurry Polymerization Reactor," Incorporated here by reference. technical field [0003] The present invention generally relates to olefin polymerization systems and methods. More specifically, the present invention relates to an olefin polymerization system and process comprising a diluent and / or unreacted monomer withdrawn from the polymerization reactor and recycled to the polymerization reactor Improved method for removal of heavy components. Background technique [0004] Olefin polymerization can be carried out under slurry conditions. Such polymerizations may be carried out in a loop reactor in which monomers are polymerized to produce a slurry of solid polymer particles in a liquid medium. Part of the slurry is sent to a wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/00B01J8/00
Inventor D·H·伯恩斯D·W·弗塞尔
Owner CHEVRON PHILLIPS CHEMICAL CO LP