烟草等温吸湿线和净等量吸附热的研究
Study on the moisture sorption isotherm and net isosteric heat of sorption of tobacco
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摘要: 以烤烟、再造烟叶、膨胀梗丝、白肋烟、香料烟为对象,研究烟草在吸湿解湿过程中热量的变化规律.采用静态法测定烟草样品不同相对湿度环境下的平衡含水率和水活度,对烟草等温吸湿线、单层水水分含量、净等量吸附热进行相关研究.结果表明:1)GAB模型为拟合烟草等温吸湿线最优模型;2)烟草样品单层水水分含量的变化范围为0.046~0.103 g/g;3)净等量吸附热随着样品含水率的增加而呈降低趋势,在正常烟草含水率条件下,白肋烟、香料烟、烤烟、再造烟叶、膨胀梗丝中水分蒸发时所需的能量依次降低.Abstract: The change regularity of heat in adsorption and desorption process of tobacco was investigated,flue-cured tobacco,tobacco sheet,expanded stem,burley tobacco,oriental tobacco as the research objects.With equilibrium water content and water activity with different relative humidity were determined by static sulfuric acid method.The moisture sorption isotherms of tobacco,the water content of the single molecule layer and net isosteric heat of sorption were studied.Results indicated that:1) GAB isotherm model was the tobacco optimal moisture sorption isotherms; 2) The variation range of single molecular layer water in tobacco samples was 0.046~0.103 g/g; 3) The net isosteric heat of sorption decreased with the increase of water content.Under the normal water content conditions,burley tobacco,oriental tobacco,flue-cured tobacco,tobacco sheet,expanded stem required for moisture evaporation energy were in descending order.
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Key words:
- tobacco /
- moisture sorption isotherm /
- water activity /
- net isosteric heat of sorption
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