2010•Linchan huaxue yu gongyeRequires access

Pyrolysis Kinetics of Alkali Lignin Catalyzed by Sodium Carbonate

Jiewang Ye, Chunde Jin, Song PingAn, Wu Qiang

Abstract

Influence of sodium carbonate(Na2CO3) on pyrolysis characteristics and kinetics of alkali lignin were studied by thermo-gravimetric(TG) analysis.Result show that depolymerization or glass transformation of alkali lignin are effected by Na2CO3,moving TG curve towards lower temperature.Na2CO3 has a promoting effect on the formation of char.Derivative thermogravimetry(DTG) curves of alkali lignin change from the original single peak to double peak.Coats-Redfern method was used to analyze the pyrolysis process and dynamics simulation was carried out.The pyrolysis of alkali lignin is a two-consecutive step first-order reaction,and the turning point of which moves towards lower temperature area.At lower temperature area,Na2CO3 shows a promoting effect on pyrolysis of alkali lignin,while an inhibitory effect at higher temperature area.Activation energy of main pyrolysis area of alkali lignin decreases after adding Na2CO3,indicating Na2CO3 to be benefitial for the pyrolysis of alkali lignin.

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Key concepts: Pyrolysis, Lignin, Chemistry, Alkali metal, Sodium carbonate, Char, Depolymerization, Kinetics