Sökning: "Thermal yellowing"

Hittade 2 avhandlingar innehållade orden Thermal yellowing.

1. 1. on the thermal yellowing of TCF- bleached birch kraft pulp

   Författare :Anders Granström; KTH; []
   Nyckelord :Ageing; Brightness reversion; Chalaton; Colour reversion; Dicarboxylic acids; Discoloration; HexA; Hexenuronic acid; Kraft pulp; Metal profile; Thermal yellowing; Xylan;

   Sammanfattning : .... LÄS MER

3. 2. On the importance of oxidizable structures in bleached kraft pulps

   Författare :Olena Sevastyanova; Göran Gellerstedt; Colodette Jorge; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; bleached pulps; betula; eucalyptus; 5-formyl-2furancarboxylic acid; 2-furancarboxylic acid; hexenuronic acid; kappa number; kraft pulps; oxidation equivalents; Cellulose and paper engineering; Cellulosa- och pappersteknik;

   Sammanfattning : After cooking, kraft pulps always contain not only residual lignin but also significant amounts of hexenuronic acid and other non-lignin structures oxidizable by permanganate under the standard kappa number determination conditions. These here referred to as false lignin. LÄS MER