Technological conditions and optimization of near-critical water treatment of waste tobacco leaves
In order to explore the optimal process conditions for producing bio-oil from waste tobacco leaves treated with near-critical water,a single factor experimental design was used to investigate the effects of reaction temperature,solid-liquid ratio and holding time on the bio-oil yield of tobacco leaves.The technology conditions of near-critical water treatment of waste tobacco were optimized by orthogonal experiment.The results showed that the optimal treatment combination was 260℃,solid-liquid ratio 4:50 and holding time 15min.Under these conditions,the yield of tobacco leaf bio-oil was 57.68％.The composition of water-soluble oil and residual oil was characterized by GC-MS analysis.The results showed that a total of 69 chemical components were isolated under the optimal extraction process conditions,mainly phenols,accounting for 49.39％of the total,followed by heterocycles,accounting for 25.69％of the total;a total of 37 chemical components were isolated from the residual oil,mainly esters and heterocycles,accounting for 25.66％and 20.21％of the total oil,respectively.This method follows the concept of green extraction,uses water as solvent,and is environmentally friendly.Compared with traditional extraction methods,this method has high yield of bio-oil and rich aroma components,which provides a new way for the treatment of waste tobacco leaves.
near-critical waterwaste tobacco leavesbio-oilaroma componentsorthogonal test
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