| abstract |
The invention relates to a method, which is used to monitor the composition of a polymer blend, melt and/or solution used to produce a polymer and to an automatic analysis device ( 27 ). To produce the polymer, the polymer blend, melt and/or solution is guided through an installation volume and a sample gas that is formed from said polymer blend, melt and/or solution is withdrawn, preferably at several sampling sites ( 30 to 36 ). The sample gas is fed to a mass spectrometer ( 28 ), which automatically emits an analysis signal representing the composition of the sample gas. The sampling site is connected to the mass spectrometer in a switchable manner via an automatically switchable shut-off device ( 47, 48 ), in such a way that several sampling sites can be sampled in succession by the mass spectrometer ( 28 ). The use of the mass spectrometer ( 28 ) permits an extremely accurate analysis of the composition of the sample gas and precise control of the process parameters of the reactor systems that are used for the polymer production. Said method and automatic analysis device can be used, in particular, during a polycondensation process. |