Encontrados 4 documentos, a visualizar página 1 de 1
Polyurethanes as a viable route to valorise lignin
Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E.; Belgacem, M.N.This work presents a study concerning the use of lignin as a macromonomer in polyurethane (PU) synthesis based on four lignin samples (Sarkanda (Granit SA), Indulin AT (MeadWestvaco), Curan 27-11P (BorregaardLigno Tech) and Alcell (Repap Enterprises). They represent three different botanic origins (hardwood, softwood and non-wood), as well as three different pulp processes (kraft, soda and organosolv). The work...
Um processo integrado para produzir compostos fenólicos de elevado valor acresc...
Silva, E.A.B.; Zabkova, M.; Araújo, J.D.; Cateto, C.A.; Barreiro, M.F.; Belgacem, M.N.; Rodrigues, A.E.Neste trabalho, apresenta-se a estratégia que combina a engenharia de reacções e processos de separação para converter lenhina, obtida de licores processuais, em aldeídos de elevado valor acrescentado. O principal resultado é um processo integrado de produção de vanilina a partir de lenhina Kraft. O processo de integração é baseado em três etapas principais. A primeira etapa consiste na oxidação alcalina da len...
Rigid polyurethane foams from lignin based polyols
Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E.; Belgacem, M.N.Rigid polyurethane (RPU) foams were synthesized using lignin-based polyols obtained by an oxypropylation process. Alcell, Indulin AT, Curan 27-11P and Sarkanda lignins have been oxypropylated using formulations deduced from an optimization study with Alcell. L/PO/C (ratio between lignin, PO and catalyst content) of 30/70/2 and 20/80/5 were used to obtain the desired polyols. The resulting RPU foams were charact...
Lignin-based polyurethane materials
Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E.; Belgacem, M.N.Four technical lignins (Alcell, Indulin AT, Sarkanda and Curan 27-11P) were used as macromonomers in the synthesis of polyurethane materials following two global approaches. In the first one Alcell and Indulin AT lignins were used directly as co-monomers in combination with a linear polycaprolactone (PCL) in order to produce polyurethane elastomers where lignin content varied between 10 and 25% (w/w) with respe...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||