Process for preparing an olefin polymer comprising withdrawing a gaseous sample for analyzing
AssigneeBasell Polyolefine GmbH
InventorsGerhardus Meier, Ulf Schueller, Heike Gregorius, Gregor Hahn
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Abstract
A process for preparing an olefin polymer in a polymerization apparatus in the presence of a solid particulate polymerization catalyst and an organometallic compound, including the steps of withdrawing a gaseous stream from the polymerization apparatus, passing the gaseous stream through a bed of particulate solid having, at the surface of the particulate solid, chemical groups which are reactive with the organometallic compound, and feeding a sample of the gaseous stream into an analyzer.
Claims15
A process for preparing an olefin polymer comprising the steps of:
- a) feeding
- (i) a solid particulate polymerization catalyst,
- (ii) an organometallic compound, and
- (iii) an olefin or a combination of an olefin and one or more other olefins
- into a polymerization apparatus comprising a polymerization reactor or a combination of polymerization reactors,
- b) homopolymerizing the olefin or copolymerizing the olefin and the one or more other olefins at temperatures from 20° C. to 200° C. and pressures of from 0.1 MPa to 20 MPa, in the presence of the polymerization catalyst and the organometallic compound,
- c) withdrawing a gaseous stream from the polymerization apparatus,
- d) passing the gaseous stream through a bed of particulate solid, having, at the surface of the particulate solid, chemical groups which are reactive with the organometallic compound, and
- e) feeding a sample of the gaseous stream into an analyzer for analyzing the gaseous sample.
A vessel comprising:
- (a) a pipe having a diameter from 6 mm to 100 mm,
- (b) an inlet for introducing a gas stream into the pipe,
- (c) an outlet for withdrawing a gas stream from the pipe,
- (d) a first valve at a first end of the pipe for introducing a bed of particulate solid into the pipe, and
- (e) a second valve at the opposing, second end of the pipe for removing the bed of particulate solid from the pipe,
- wherein the inlet and the outlet of the pipe are provided with screens having a mesh size from 35 μm to 2 mm for retaining the bed of particulate solid within the pipe and the distance between the inlet and the outlet is from 0.2 m to 10 m.
A method for controlling an olefin polymerization process comprising homopolymerizing an olefin or copolymerizing an olefin and one or more other olefins at temperatures from 20 to 200° C. and pressures of from 0.1 MPa to 20 MPa, in the presence of a solid particulate polymerization catalyst and an organometallic compound in a polymerization apparatus comprising a polymerization reactor or a combination of polymerization reactors, comprising the steps of:
- withdrawing a gaseous stream from the polymerization apparatus;
- passing the gaseous stream through a bed of particulate solid having, at the surface of the particulate solid, chemical groups which are reactive with the organometallic compound;
- feeding a sample of the gaseous stream into an analyzer for analyzing the gaseous sample;
- analyzing the sample, thereby obtaining information on the conditions within the polymerization apparatus;
- and
- adapting, based on the information, the polymerization conditions within the polymerization apparatus to predefined values.
Dependencies are inferred from the claim text.