Method and apparatus for automatically and simultaneously contro

Details Method and apparatus for automatically and simultaneously contro Method and apparatus for automatically and simultaneously contro

1974-07-22

1977-03-22

Lindsay, Jr., Robert L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With testing, sampling or analyzing

162238, 162DIG10, D21C 914, D21C 910

Patent

active

040135063

ABSTRACT:
A method and apparatus are provided for automatically and simultaneously controlling the solution viscosity and degree of brightness of a pulp during a bleaching process which employs a sequence of chlorination, hypochlorite and chlorine dioxide bleaching reagents. The pulp is monitored during the bleaching sequence by employing an optical device utilizing reflected light of one or two wavebands. The optical monitoring device electronically feeds a control signal to a regulator or computer which regulates the input of one or more of the bleaching reagents. The amounts of reagents added are based upon and made possible by relationships which have now been determined between the light reflectance values of the pulp at various stages of the process and desired viscosity and brightness values. The viscosity is controlled by controlling the hypochlorite addition and the brightness of the fully bleached pulp is controlled by chlorine dioxide addition.

REFERENCES:
patent: 3035967 (1962-05-01), Sacksen et al.
patent: 3465550 (1969-09-01), Strum et al.
patent: 3729375 (1973-04-01), Chappelle
patent: 3764463 (1973-10-01), Histed et al.
Obenshain; "Black Widow Bleaching Control System," pp. 1-9, Tappi; vol. 41, No. 1, Jan. 1958.
Strom, "Improved Chlorination Control by Color Measurement," Tappi; Nov. 1973, vol. 56, No. 11.

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