Method and apparatus for monitoring and controlling characterist

Radiant energy – Invisible radiant energy responsive electric signalling – Ultraviolet light responsive means

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250373, G01N 2133, D21C 910, D21H 2502

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active

060230657

ABSTRACT:
A method and an apparatus for monitoring and controlling a characteristic of process waters or effluents from wood pulp bleaching, pulping and paper making processes utilizing a bleaching agent such as hydrogen peroxide (H.sub.2 O.sub.2), Na.sub.2 S.sub.2 O.sub.4, ClO.sub.2, Cl.sub.2 or O.sub.3 or a pulp delignification process utilizing a delignification agent such as NaOH, Na.sub.2 S, O.sub.2, Na.sub.2 SO.sub.3, and enzymes including ligninase, xylanase, mannanase, laccase, and peroxidase are disclosed. This is done by obtaining at least three measurements of ultraviolet-visible light from the effluent by taking a first measurement measured at a first wavelength, a second measurement measured at a second wavelength, and a third measurement at a third wavelength, formulating two ratios from the three measurements and using the ratios for computing an empirical value of the characteristic of the effluent. Feedback control is used for adjusting feed input components in accordance with the computed empirical value of the characteristic such that a target measurement of the characteristic is obtained.

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"L, a, b, 45.degree. 0.degree. Colorimetry of White Paper and Near-White Paper and Paperboard", T 524 om-86 Optical Properties Committee of the Process and Product Quality Division, 1986.
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Abstract XP-002073358, AN 82-40955E, Database WPI, Section Ch, Week 8220, Derwent Publications Ltd., London, GB.

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