公开(公告)号：WO2020102388A1

公开(公告)日：2020-05-22

申请号：PCT/US2019/061227

申请日：2019-11-13

申请人： EXXONMOBIL CHEMICAL PATENTS INC.

发明人： CLYMANS, Paul, J. ,  GALLIANO, Jefferson, P. ,  D'HOOGHE, Philippe, A.P. ,  DEWITTE, Cindy ,  LAMMENS, Henri, A.

IPC分类号： B01J3/00 ,  B01J3/04 ,  C08F2/01

摘要： 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.