TORREFICATION AND PYROLYSIS OF PINUS SYLVESTRIS L. NEEDLES: COMPARATIVE CHARACTERISTICS OF PRODUCTS

XFYXPS

Abstract

Currently, among the methods of processing woody greens (WG and needles, in particular), various options for extraction processing prevail to obtain in-demand products for the production of goods in agricultural, medical, food, perfumery and cosmetics and other industries. In our opinion, pyrolytic conversion of this raw material in order to obtain liquid and solid biofuels is an important direction of using woody greenery and needles (leaves).  In the Russian Federation, no attention is paid to this area. In our study, we obtained new data on the physico-chemical properties of torrefacts and biochar obtained by thermal processing of pine needles. On the basis of a complex of methods – scanning electron microscopy (SEM), thermogravimetry (TG/DTG using second derivatives of DTG contours by temperature), differential scanning calorimetry (DSC) and analytical pyrolysis (Py-GC/MS) – the physicochemical properties of torrefacts and biochar obtained at different temperatures of pine needles pyrolysis were studied for the first time. The mechanism of thermo–oxidative destruction of biochar, characteristic differences of products in structure (SEM), processes of thermo-oxidative destruction - in mass loss and kinetics (activation energy, reaction rate constants), in specific heat of combustion of torrefacts and biochar, component composition of "secondary" pyrolyzates obtained by flash pyrolysis of torrefacts and biochars at 600 °C. The expediency and prospects of pyrolytic processing of pine needles are discussed.