Method by analysis by on-line chromatography for the polymerization of olefins
View Patent ↗A method for the analysis by on-line gas phase chromatography of a gaseous phase produced by an olefin polymerization process which includes carrying out a chromatographic analysis of a gaseous phase produced by an olefin polymerization process with carrier gases containing mainly hydrogen and/or nitrogen, wherein the content of oxygen and of water of the hydrogen and the nitrogen in the carrier gases is less than 5 ppm by weight.
1. A method for the analysis by on-line gas phase chromatography of a gaseous phase produced by an olefin polymerization process comprising carrying out a chromatographic analysis of a gaseous phase produced by an olefin polymerization process with carrier gases containing mainly hydrogen and/or nitrogen, wherein the content of oxygen and of water of the hydrogen and the nitrogen in the carrier gases is less than 5 ppm by weight.
2. The method according to claim 1 , wherein the content of oxygen and of water of the hydrogen and the nitrogen is less than 1 ppm by weight.
3. The method according to claim 1 or 2 , wherein the olefin polymerization process is carried out in a gaseous phase.
4. The method according to claim 3 , wherein the olefin polymerization process is carried out in a fluidized bed reactor.
5. The method according to claim 1 or 2 , wherein the content of oxygen of the hydrogen is less than 0.7 ppm by weight.
6. The method according to claim 1 or 2 , wherein the content of oxygen of the hydrogen is less than 0.7 ppm by weight.
7. The method according to claim 1 or 2 , wherein the content of CO and of CO 2 of the hydrogen and the nitrogen is less than 1 ppm by weight.
8. In a process for continuously producing an olefin polymer in a reactor for polymerizing olefins in the presence of a polymerization catalytic system, during which process at least one operating parameter of the process is controlled by an analysis by on-line chromatography of a gaseous phase produced by said process, the improvement comprising carrying out said chromatographic analysis with carrier gases containing mainly hydrogen and/or nitrogen, wherein the content of oxygen and of water of the hydrogen and the nitrogen in the carrier gases is less than 5 ppm by weight.
9. The process according to claim 8 , wherein the content of oxygen and of water of the hydrogen and the nitrogen is less than 1 ppm by weight.
10. The process according to claim 8 or 9 , wherein the olefin polymerization is carried out in a gas phase in a fluidized bed reactor.
11. The process according to claim 8 or 9 , wherein the catalytic system contains an organic aluminium compound.