PROCESSES FOR REDUCING SHUTDOWN TIME OF SUB-SYSTEMS IN LOW-DENSITY POLYETHYLENE PRODUCTION
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United States of America Patent
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Issued Date -
Jun 29, 2023
app pub date -
May 18, 2021
filing date -
Jun 24, 2020
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Abstract
Processes for reducing shutdown time of a sub-system/ reactor component in an LDPE process. The process includes closing one or more pairs of upstream lock-out valves, each pair of upstream lock-out valves being located in an inlet stream upstream of the reactor component and configured to cease fluid flow into the reactor component through said inlet stream when said pair of upstream lock-out valves is closed; closing one or more pairs of downstream lock-out valves, each pair of downstream lock-out valves being located in an outlet stream downstream of the reactor component and configured to cease fluid flow out of the reactor component through said outlet stream when said pair of downstream lock-out valves is closed; depressurizing the reactor component; introducing purge gas comprising N2 into the reactor component at and withdrawing the purge gas from the reactor component.
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