Analysis of Depolymerization Product of Ginkgo Biloba Residues in Supercritical Methanol
Reaction of ginkgo biloba residues with methanol was conducted under supercritical conditions, and depolymerization product was analyzed with FTIR and GC/MS.Results showed that its components were quite complex,and 86 organic compounds were identified,in which there were 59 kinds of oxygen-containing organic compounds including esters,phenols,aethers,alcohols and ketone in the methanolyzed product.Small amounts of normal alkanes,alkenes and nitrogen-containing organic compounds were also detected,which showed the characteristics of methanolyzed product with high oxygen content.The content of phenols was 10.65% and content of anisole was 5.20% whereas the content of arenas was 3.34% in methanolyzed product,and these substances could come from depolymerization of lignin.The content of methyl esters and dimethyl diesters was 32.84%,indicating that esterification reactions of some substances of ginkgo biloba residues or depolymerization products with methanol could proceed.All these facts indicated that supercritical methanol involved in depolymerization of ginkgo biloba residues,and there were synergistic reaction of methanolysis and pyrogenation of ginkgo biloba residues with methanol.