Method for the recovery of formic acid

Details Method for the recovery of formic acid Method for the recovery of formic acid

D - Textiles, Paper

21

C

D21C 3/20 (2006.01) D21C 3/04 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2300114

The invention relates to a method for removing chemically bound formic acid from a material containing the same, in the presence of free formic acid. The method is characterized in that chemically bound formic acid is allowed to react to free formic acid at a normal pressure, at a temperature of less than 100 °C, the initial content of free formic acid being about 3 to 20 %. The reaction time is typically 0.5 to 4 hours. The material to be treated may be, for instance, material, obtained from a formic-acid-based pulp cooking process, containing cellulose and/or lignin.

L'invention concerne un procédé d'extraction d'acide formique lié chimiquement d'une matière le contenant, en présence d'acide formique libre. Le procédé se caractérise en ce qu'on laisse l'acide formique lié chimiquement réagir avec l'acide formique libre à une pression normale, à une température inférieure à 100 DEG C, la teneur initiale en acide formique libre étant comprise entre environ 3 et 20 %. Le temps de la réaction est typiquement compris entre 0,5 heure et 4 heures. La matière à traiter peut être, par exemple, une matière obtenue à partir d'un processus de cuisson de pâte à base d'acide formique, contenant de la cellulose et/ou de la lignine.

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