Method for regulating the manufacturing of pulp by optically measuring the amount of hexenuronic acid
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United States of America Patent
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Sep 20, 2005
Grant Date -
Sep 25, 2003
app pub date -
May 30, 2001
filing date -
May 31, 2000
priority date (Note) -
Expired
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Abstract
Method for enabling the paper pulp production process to be controlled in such a way that the hexenuronic acid content in the pulp can be minimized and the color reversion of the pulp and/or the pulp products thereby minimized. The method is based on measurements of the optical properties of a fiber containing substance or process stream in the wavelength region 232±5 nm and another wavelength interval. A significant value for the current hexenuronic acid content is formed by correcting the intensity in the spectrum around 232 nm by the corresponding optical quantity at the other wavelength interval. The content of the hexenuronic acid content that is determined by the analysis is then used for controlling conditions in the process stage.
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