D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 11/10 (2006.01) C07C 51/44 (2006.01) C07D 307/50 (2006.01) D21C 3/04 (2006.01) D21C 3/20 (2006.01) D21C 11/00 (2006.01) C07C 53/02 (2006.01) C07C 53/08 (2006.01) C07D 307/48 (2006.01)
Patent
CA 2477848
The invention relates to a process for producing furfural, for forming formic and acetic acids and for recovering formic and acetic acids in a pulp making process, in which an acid mixture containing mainly formic and acetic acids is used as a cooking chemical. The process of the invention is characterized by utilizing reactive evaporation and recycling of spent cooking liquors in evaporators in the recovering stage of the cooking chemicals. Thus it is possible to form effectively more furfural, formic acid and acetic acid from the dissolved organic matter contained in the cooking liquor and/or chemically bound acids contained therein.
L'invention se rapporte à un procédé de production de furfural, d'acides formique et acétique et de récupération d'acides formique et acétique dans un procédé de fabrication de pâte, au cours duquel on utilise un mélange acide contenant principalement des acides formique et acétique comme produit chimique de cuisson. Le procédé de cette invention est caractérisé en ce qu'il fait intervenir l'évaporation réactive et le recyclage de liqueurs noires dans des évaporateurs à l'étage de récupération des produits chimiques de cuisson. Il est, par conséquent, possible de former efficacement plus de furfural, d'acide formique et d'acide acétique à partir de substances organiques dissoutes contenues dans la liqueur de cuisson, et/ou à partir d'acides liés chimiquement contenus dans la liqueur de cuisson.
Anttila Juha
Rousu Esa
Rousu Pasi
Tanskanen Juha
Chempolis Oy
Shapiro Cohen
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