Process for stabilizing the PH of a pulp suspension and for...

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With chemical or physical modification of liberated fiber

Reexamination Certificate

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C162S063000, C162S090000, C162S181400, C162S182000, C162S183000, C162S158000

Reexamination Certificate

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06991705

ABSTRACT:
The invention relates to a process for stabilizing the pH of a pulp suspension with buffering agents and to a process for producing paper from a stabilized pulp suspension. The alkalinity of the pulp suspension is increased by a combination of an alkali metal hydroxide feed and a carbon dioxide feed. Said feeds provide a significant buffering effect which stablilizes the pH of said pulp suspension for the paper making process.

REFERENCES:
patent: 5378322 (1995-01-01), Hornsey
patent: 6086714 (2000-07-01), Plaskon et al.
patent: 2003/0150570 (2003-08-01), Leino et al.
patent: 2004/0238455 (2004-12-01), Leino
patent: 1288906 (1991-09-01), None
patent: 0 281 273 (1988-09-01), None
patent: 815247 (1959-06-01), None
patent: WO 8804705 (1988-06-01), None
patent: WO 90/09483 (1990-08-01), None
Ostberg et al., 5th Internatl. Conf. on New Avail. Technique-Stockholm, “Use of Carbon Dioxide in the Production of Sulfate Pulp,” Jun. 1996, pp. 508-515.
Gullichsen et al. (eds.), In: Papermaking Science & Technology, “Papermaking Chemistry,” book 4, 1999, p. 192.

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