D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 3/20 (2006.01) D21C 3/22 (2006.01)
Patent
CA 2417791
The invention relates to a process for digesting woodchips used in papermaking. The process employs digester additive, which comprises a sultaine or mixtures of a sultaine with a nonionic surfactant selected from the group consisting of (a) polyglycosides, (b) polyoxyalkylene glycols, and (c) mixtures thereof as digester additives. The digester additives are compatible and stable at elevated temperatures in the highly alkaline white liquor used in the digestion of woodchips into pulp. The invention also relates to the digester additive compositions.
La présente invention concerne un procédé de lessivage de copeaux de bois qui seront utilisés dans la fabrication de pâte à papier. Le procédé précité fait appel à un additif de lessivage, qui comprend une sultaïne ou des mélanges de sultaïne et d'un tensio-actif non ionique choisi dans le groupe composé (a) des polyglycosides, (b) des polyoxyalkylène glycols, et (c) de mélanges de ces derniers comme additifs de lessivage. Les additifs de lessivage de l'invention sont compatibles et stables à des températures élevées dans la liqueur blanche hautement alcaline utilisée dans le lessivage des copeaux de bois en pâte à papier. L'invention concerne également des compositions d'additifs de lessivage.
Khan Abdul Q.
Wai George K.
Ashland Inc.
Ashland Licensing And Intellectual Property Llc
Gowling Lafleur Henderson Llp
LandOfFree
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