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US 12,332,174 B2Granted
Method and system for determination of starch in a sample
AssigneeKemira Oyj
InventorsLari Vähäsalo, Marjatta Piironen, Iiris Joensuu
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Abstract
In a starch concentration measurement, a liquid sample is conducted from a liquid sample such as pulp suspension or filtrate of a paper, board or tissue process. An iodine solution is added to the sample, and a light absorbance or transmittance of the sample is measured at a wavelength longer than about 650 nm, for example longer than about 700 nm. The measured absorbance or transmittance of the sample is converted into the starch concentration of the sample by a predefined correlation between a starch concentration and a light absorbance or transmittance.
Claims17
A method comprising;
- conducting a sample of liquid from a process stream of liquid for online analysis of a starch concentration in the process stream of liquid based on the sample of liquid;
- adding iodine solution to the sample of liquid;
- measuring a light absorbance or transmittance of the sample of liquid at a wavelength of 650 nm to 900 nanometers where unreacted iodine does not absorb light, after the step of adding the iodine solution;
- converting the measured absorbance or transmittance of the sample of liquid into the starch concentration of the sample of liquid by a predefined correlation between a starch concentration and a light absorbance or transmittance;
- wherein:
- the sample of liquid is conducted from a pulp suspension or filtrate in a paper, board or tissue process, and/or the method further comprises controlling a paper board or tissue process utilizing the starch concentration of the sample.
3 more elements
A method, comprising:
- conducting a sample of liquid from a process stream of liquid for online analysis of a starch concentration in the process stream of liquid based on the sample of liquid;
- adding iodine solution to the sample of liquid;
- measuring a light absorbance or transmittance of the sample of liquid at a wavelength of 650 to 900 nanometers both before and after adding the iodine solution to provide two measurements;
- and
- converting a difference between the two measurements of measured absorbance or transmittance of the sample of liquid into the starch concentration of the sample by a predefined correlation between a starch concentration and a light absorbance or transmittance;
- wherein:
- the sample of liquid is conducted from a pulp suspension or filtrate in a paper, board or tissue process, and/or the method further comprises controlling a paper, board or tissue process utilizing the starch concentration of the sample.
4 more elements
Dependencies are inferred from the claim text.