Method for determining the degree of completion and pulp yield

Details Method for determining the degree of completion and pulp yield Method for determining the degree of completion and pulp yield

1983-09-26

1985-09-10

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With testing, sampling or analyzing

162 61, 436146, D21C 712

Patent

active

045404682

ABSTRACT:
A method is described for monitoring and determining the degree of completion, pulp yield, and residual lignin content in a pulping or delignification reaction. The system provides an on-line, real time, closed loop process control system for the reaction of a known quantity of wood in process liquor. The desired pulp yield is achieved by sampling the liquor during the reaction; determining the total organic carbon content of the sampled liquor; and calculating the degree of completion of the reaction and pulp yield from the process liquor total organic carbon content determination using an appropriate mathematical model. The mathematical model is based upon conservation of carbon mass in the wood or pulp and liquor during the reaction, and includes a conservation of mass equation in which the total organic carbon in the sampled liquor substantially equals the total carbon in the starting quantity of wood or pulp less the total carbon in pulp wood residue at the time of sampling the liquor. Variations of the basic system and method are described.

REFERENCES:
patent: 3672841 (1972-06-01), Freeman, Jr. et al.
patent: 3674434 (1972-07-01), Pottenger
patent: 3854877 (1974-12-01), Csaky et al.
Bublitz, "Fluorescence of Pulping Liquors: A Tool For Digester Control?", TAPPI, Jun. 1981, vol. 64, No. 6, p. 73.
McDonald, "Calorific Value of Spent Liquors by Carbon Analysis", TAPPI, Dec. 1977, vol. 60, No. 12, p. 107.

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