Sampling polyolefin intermediates method

A process for providing an intermediate polyolefin polymer sample from a first polyolefin polymerization reactor coupled in series with a second polyolefin polymerization reactor and being connected by a connecting conduit, the first polyolefin polymerization reactor being operated below 100° C.,

• the process, comprising:
• a) feeding a part of the reaction mixture including intermediate polyolefin polymer, unreacted monomers and optionally unreacted comonomers, catalyst, aluminum containing cocatalyst and optionally external donors from the first polyolefin polymerization reactor or from the connecting conduit to a sampling conduit, wherein
• the sampling conduit is defined by an inlet valve and an outlet valve and wherein
• the sampling conduit is connected via a feed line to a sampling pot;
• by opening the inlet valve and keeping the outlet valve-closed;
• and then closing the inlet valve;
• and
• b) opening the outlet valve thereby feeding the reaction mixture into the sampling pot via feed line;
• c) flashing and degassing the reaction mixture in the absence of catalyst poisons;
• optionally flushing by nitrogen in the absence of catalyst poisons;
• d) thereafter introducing a non-combustible deactivation agent into the sampling pot for catalyst deactivation under conditions such that the non-combustible deactivation agent is in vapor state and wherein the non-combustible deactivation agent is selected from carbon dioxide or a mixture of carbon dioxide and water;
• e) optionally feeding unreacted monomers, optionally present unreacted comonomers, catalyst decomposition products, aluminum containing cocatalyst and optionally present external donors into reprocessing and/or removal facilities and
• f) providing an intermediate polyolefin polymer sample in the sampling pot (5).