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Treatment of Kraft Lignin with Nitrogen(IV)oxides by Per Larsson; Olof Samuelson; Urban Öjteg is a Engineering article available to read on EtoBox.

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## Xrrwordr Ugnins Nitrogen diopdc Nitricacid Oiygen Diniuogen oxidc Carbon dknöde Pennealion Chromatograph) Molecular «ze Alkali trcatment Sofhwod Kiafl pulping Tieaunent of kraft lignin »ilb NO; gave rise 10 enhanced h%drophilkpropcrtks(foffiiutkMi and incjvased »aier Kgain). Addition» of ox>gen and düute tuinc acid led 10 inocased effects and to an incrcased fonnauon of CO> and NX). Thcir formation continued after the added NO : «äs consumed compteiety e.g. aftcr 120 min ai 68XX These resulis and an obterved consumption of mtnc acid sho»ed generabon of actne niirogen oudes from HNO, »äs a key neactioo. NO ; -ircatmeni led 10 an insed mokcular axe of tbe lignin cxpLuned by produoed iniermolecular cstcr linka$es. Alkaline tntai-ment& split ibesc hnkages abeady ai loom tetnpcrature. In addiüon NOrtrcaiment leadts 10 a dccrcascd alkall stability of morc flaMc ünkapes, piobabl) ß-ar>l ether bonds.The motecuUr uze decrvased maricdly by bot alkali ticatmeni foüa»ing NOrtreatments »iib addiiions of hoch HNO? and O>. The combined effeci of an increased deli^nification duiing ibe NO r treauneni enhanced h\dn>phibc propenies of tbe lemaining bgnin and a dccrcased alkali stabüity explain th

Who reads Treatment of Kraft Lignin with Nitrogen(IV)oxides?

Author

Per Larsson; Olof Samuelson; Urban Öjteg

Published

1989

Field

Engineering (Physical Sciences)