Composition, biomass lignins carbon content

Flash pyrolysis in FFR is a usefnl means to remove snlphnr from coal [19, 21]. As shown by Li et al. [22], it can also be ntilized to remove heteroatom molecules from biomass. Both the yield and the composition of the resnltant gas depend on the biomass composition. The gas ontpnt is richer in hydrogen in the case of cellulose and hemicel-Inlose than in the case of lignin. Smaller biomass particle sizes and higher fast pyrolysis temperatnres also boost hydrogen content. The total of carbon monoxide and hydrogen content is reported to be 65.4% for legnme straw and 55.7% for apricot stone. 

Using regression analysis to quantify the intrinsic cellulose, lignin, and ash fractions effects on a few products, MacKay and Roberts (1982) studied the pyrolytic behavior of 20 unmodified or native powdered Hgnocellulosic materials. Linear regression models for total mass and carbon yields of the products were developed, assuming each constituent fraction of the biomass was pyrolyzed independently. They concluded that char yield increased with substrate ca n content char yield from lignin content was found to be three times that of cellulose content. They did not study the gas nor tar composition in their experiments. In addition their particle sizes... 

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