tailieunhanh - Báo cáo lâm nghiệp: "Pyrolysis of Pinus halepensis needles treated with fire retardants"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Pyrolysis of Pinus halepensis needles treated with fire retardants. | Ann. For. Sci. 61 2004 551-555 INRA EDP Sciences 2004 DOI forest 2004050 551 Original article Pyrolysis of Pinus halepensis needles treated with fire retardants Stylianos Liodakis Dimitris Gakis Karita Ahlqvist Miltos Statheropoulos Department of Chemical Engineering Sector 1 National Technical University of Athens NTUA 9 Iroon Polytechniou Str. 157 73 Athens Greece Received 11 March 2003 accepted 26 February 2004 Abstract - The effect of various chemical fire retardants NH4 2SO4 NH4 2HPO4 a commercial retardant contained 10 w w phosphate salt on the pyrolysis mass residue of Pinus halepensis needles was studied on preparative-scale. Samples of g were treated under isothermal 400 C and 500 C and non-isothermal conditions 50-500 C with pyrolysis time between h. The results of this study were found similar with those obtained with much lower sample sizes . 6 mg used in analytical methods such as Thermogravimetry TG . The phosphate based retardants had the most significant action under the experimental conditions used. However the retarding effect was reduced when the phosphate retardants were diluted in sea water. This might be attributed to the formation of insoluble salts . MgNH4PO4 . Such reactions might bind the active phosphates thus reducing the fire retarding effect. Pinus halepensis needles pyrolysis fire retardants sea water Résumé - Pyrolyse du feuillage du pin d Alep en presence de retardants du feu. On a étudié l effet de retardants chimiques comme NH4 2SO4 NH4 2HPO4 et d un retardant commercial contenant 10 w w de sel phosphaté sur la masse restante pendant la pyrolyse des aiguilles de Pinus halepensis en quantités préparatoires. Des échantillons de 2 00 g ont été chauffés en conditions isothermes 400 C et 500 C et en conditions non isothermes 50 et 500 C avec un temps de pyrolyse compris entre 0 00 et 3 00 h. Les résultats sont similaires à ceux obtenus avec une masse plus petite 6 mg comme les échantillons des méthodes .