Continuous method for the precipitation of lignin from black liquor

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United States of America Patent

PATENT NO 9719210
SERIAL NO

14825363

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Abstract

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In a method for the continuous precipitation of lignin from black liquor black liquor is provided so as to flow as a pressurized flow in a reactor with a dwell time of less than 300 s. An acidifying agent selected from the group of carbon dioxide, acid and their combinations is led to the flow at one or more feeding sites to lower the pH of black liquor. The pH is allowed to decrease by the effect of the acidifying agent in the pressurized flow to the precipitation point of lignin, the pressure of the pressurized flow is abruptly released, and lignin particles are separated from black liquor.

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Patent Owner(s)

Patent OwnerAddress
UPM-KYMMENE CORPORATIONHELSINKI

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Miettinen, Mauno Lappeenranta, FI 21 89

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