Exxonmobil Chemical Patents Inc.

Philippe A P D'Hooghe

Henri Aime Lammens

Paul Jan Clymans

Cindy Dewitte

Jefferson P Galliano

Controlling the shutdown of a polyethylene reactor system that includes a secondary compressor, a reactor, a high pressure let down valve (HPLDV), a high-pressure separator, and a high-pressure recycle gas system is provided. After a partial or complete shutdown of secondary compressor, HPLDV opens to a pre-set open position until the reactor pressure reduces to either a pre-set reduced pressure limit or a until the slope of the reactor gas density to reactor pressure exceeds 0.15. The HPLDV controls the pressure to a pressure set point.

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Merelbeke, Belgium

Philippe A P D'Hooghe