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US 11,993,895 B2Granted
Method of feeding wood chips to a prehydrolysis reactor
AssigneeAndritz Inc.
InventorsMarco Andrade, Ronny Geiger, Vesa Kaipainen, Auvo Kettunen, Petri Tarjavuori, Viridiane Vianna
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Abstract
A method for feeding a slurry of chips and liquid to a prehydrolysis reactor in the production of dissolving pulp. The slurry is pumped by using at least one pump to the reactor, and alkali is fed into the at least one pump 5 for adjusting the pH of the slurry to a range of 7-10.
Claims18
A method comprising:
- feeding a slurry of chips and liquid to a prehydrolysis reactor in the production of dissolving pulp, in which method the slurry is pumped by using at least one pump to the prehydrolysis reactor,
- feeding alkali into the at least one pump to increase a pH of the slurry to be in a pH range of 7 to 10 to reduce a pump wear rate of the at least one pump,
- hydrolyzing the chips in the prehydrolysis reactor,
- discharging the chips from the prehydrolysis reactor and feeding the chips to a continuous digester vessel;
- cooking the chips in the continuous digester vessel to convert the chips to pulp, and
- discharging the pulp from the continuous digester vessel.
3 more elements
A method comprising:
- pumping with a pump a slurry of liquid and chips of cellulosic fiber material
- increasing a pH of the slurry flowing through the pump to a pH range of 7 to 10 by feeding alkaline into the slurry flowing to or flowing through the pump to reduce a pump wear rate of the pump;
- and
- feeding the slurry flowing from the pump into to a prehydrolysis reactor,
- hydrolyzing the chips in the prehydrolysis reactor,
- extracting hydrolysate from the chips in the prehydrolysis reactor;
- discharging the chips from the prehydrolysis reactor and feeding the chips to a continuous digester vessel;
- cooking the chips in the continuous digester vessel to convert the chips into pulp, and
- discharging the pulp from the continuous digester vessel.
6 more elements
Dependencies are inferred from the claim text.