Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing
Patent
1987-04-01
1988-10-25
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With testing, sampling or analyzing
73 61R, 162238, 162258, 162263, 422 62, 422 68, 436 52, 356410, D21C 712, G01N 2100
Patent
active
047801824
ABSTRACT:
A method and suitable apparatus for periodically analyzing pulp stock, including wood pulp and water, in a pulp digester, to determine the amount of cooking to which the pulp has been subjected. The method includes taking a sample of the pulp stock from the digester, diluting the sample to a predetermined range of consistency, and determining the exact consistency of the sample. Next, the sample is transferred to a reaction chamber. A reagent is then added to the sample and allowed to react with the sample at a predetermined temperature. The light absorbance of the reagent during the reaction is continuously monitored during the reaction. After the light absorbance has clearly passed a peak, the value of the peak is combined with the consistency of the sample, previously determined, to arrive at the amount of cooking to which the sample had been subjected prior to the test, from a known relationship thereof to the light absorbance of the reagent and the consistency of the sample.
REFERENCES:
patent: 3838594 (1974-10-01), Kesler
patent: 4192708 (1980-03-01), Bergstrom et al.
patent: 4345913 (1982-08-01), Jonsson
patent: 4540468 (1985-09-01), Genco et al.
Alvo Steve
Nilles James E.
Paper Valley Instruments, Inc.
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