Sökning: "lignins"
Visar resultat 1 - 5 av 38 avhandlingar innehållade ordet lignins.
1. Förbehandling av sulfatmassa och sulfatlignin med kväveoxider
Sammanfattning : .... LÄS MER
2. Optimization of Pretreatment of Kraft Pulp with Nitrogen Oxides
Sammanfattning : Modified kraft pulp subjected to oxygen bleaching following pretreatment with 2% nitrogen dioxide for 140 min with the addition of oxygen resulted in low selectivity after subsequent oxygen bleaching. In contrast, pretreatment in the absence of oxygen removed more than 80% of the lignin after oxygen bleaching and still maintained high selectivity (kappa number less than 5 at viscosity 950 dm3/kg). LÄS MER
3. Chemical Properties and Thermal Behaviour of Kraft Lignins
Sammanfattning : Research concerning lignin has increased during the last years due to its renewability and ready availability in black liquor at pulp mills. Today, the kraft lignin found in black liquor is used as a fuel to gain energy in the recovery boiler at the mill. LÄS MER
4. Towards low-emitting and sustainable particle and fibreboards : Formaldehyde emission test methods and adhesives from biorefinery lignins
Sammanfattning : High volumes, fast production speed, and low material costs have been historically the driving factors of the particle- and fibreboard industries. However, in recent years the fossil-fuel dependency and health issues of the formaldehyde-containing adhesives used in the production have gained attention from both legislators and consumers. LÄS MER
5. On the structure of native softwood and hardwood lignins
Sammanfattning : .... LÄS MER
