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Improved Polyolefin Plant Operations by Cooler Tube Passivation

IP.com Disclosure Number: IPCOM000248825D
Publication Date: 2017-Jan-13
Document File: 3 page(s) / 177K

Publishing Venue

The IP.com Prior Art Database

Abstract

Undesired reactions in polyolefin plants can result from catalysis by materials (typically transition metals) used to construct the plant valves, vessels, pipes, heat exchangers, compressors and other process equipment. It has been found that the undesired catalytic transformations may be reduced or eliminated using passivation techniques in which H2O, air and/or O2 are added as passivation agents. The passivation operation may be executed on-line (with the process equipment in operation) or during idle/shutdown periods.

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Improved Polyolefin Plant Operations by Cooler Tube Passivation* Abstract:    Undesired  reactions  in  polyolefin  plants  can  result  from  catalysis  by  materials  (typically  transition metals) used to construct the plant valves, vessels, pipes, heat exchangers, compressors and  other  process  equipment.      It  has  been  found  that  the  undesired  catalytic  transformations  may  be  reduced or eliminated using passivation techniques in which H2O, air and/or O2 are added as passivation  agents.   The passivation operation may be executed on‐line (with the process equipment in operation) or  during idle/shutdown periods.    Background Some  special  metallurgies  used  in  construction  of  polyolefin  process  piping,  vessels,  valves,  heat  exchangers or other process equipment are catalytically active.  Specifically, certain special metallurgies  used to fabricate process coolers  in polyolefin reaction systems can catalyze the reaction of hydrogen  and ethylene to form ethane.    In the context of an operating gas‐phase polyethylene reaction system,  the ethane  formed  is  inert and must be purged  from  the  system, usually  to  flare.    In  the process of  purging ethane to flare, other compounds such as ethylene are also carried to the flare, magnifying the  effect ethane  formation on  total  flows  to  the  flare.   After destruction  in  the  flare  flame,  the resulting  e...