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US 10,697,889 B2Granted
Methods for determining transition metal compound concentrations in multicomponent liquid systems
AssigneeChevron Phillips Chemical Company LP
InventorsQing Yang, Richard M. Buck
Life of this patent
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Abstract
Methods for determining the concentration of transition metal compounds in a solution containing more than one transition metal compound are described. Polymerization reactor systems providing real-time monitoring and control of the concentrations of the transition metal components of a multicomponent catalyst system are disclosed, as well as methods for operating such polymerization reactor systems and for improving methods of preparing the multicomponent catalyst system.
Claims20
A process for preparing a catalyst composition, the process comprising:
- (I) contacting a first transition metal compound, a second transition metal compound, a solid activator, and an optional co-catalyst to form the catalyst composition;
- (II) determining a concentration of the first transition metal compound in a solution containing the first transition metal compound and the second transition metal compound, wherein the solution is separated from the catalyst composition, and the concentration is determined via the steps of:
- (i) submitting a sample of the solution to a sample chamber;
- (ii) irradiating the sample in the chamber with a light beam at a wavelength in the UV-visible spectrum;
- and
- (iii) generating a sample absorbance profile of the sample, subtracting a reference absorbance profile of the second transition metal compound in a reference solution from the sample absorbance profile to result in a first transition metal compound absorbance profile, and correlating the first transition metal compound absorbance profile to a standard to determine the concentration of the first transition metal compound in the solution;
- and
- (III) adjusting a relative amount of at least one component of the catalyst composition based on the concentration of the first transition metal compound in the solution.
5 more elements
A catalyst preparation system comprising:
- (a) a catalyst preparation vessel configured to contact a first transition metal compound, a second transition metal compound, and a solid activator to form a catalyst composition;
- (b) an activator feed stream configured to introduce the solid activator into the catalyst preparation vessel;
- (c) a first transition metal compound feed stream configured to introduce the first transition metal compound into the catalyst preparation vessel;
- (d) a second transition metal compound feed stream configured to introduce the second transition metal compound into the catalyst preparation vessel;
- (e) a catalyst system feed stream configured to withdraw the catalyst composition from the catalyst preparation vessel;
- and
- (f) an analytical system configured to determine a concentration of the first transition metal compound in a solution comprising the first transition metal compound and the second transition metal compound, wherein the solution is separated from the catalyst composition.
4 more elements
Dependencies are inferred from the claim text.