主流烟气中醛类物质滤除效率的系统化改进  

A Systematic Improvement in Filtration Efficiency of Aldehydes in Mainstream Cigarette Smoke

作　　者：Peter J.Branton 刘川 Kevin G.McAdam 曲文慧[2] 陆安慧[2] 

机构地区：[1]UK/英美烟草公司研究与开发中心 [2]大连理工大学化工学院,精细化工国家重点实验室,辽宁省大连市116024

出　　处：《烟草科技》2012年第6期5-15,共11页Tobacco Science & Technology

摘　　要：为了用卷烟滤嘴中的活性炭除去烟草烟气中的醛类,考察了活性炭比表面积、颗粒尺寸、孔道尺寸和分布,以及表面化学修饰对主流烟气中醛类吸附的影响。结果表明:①活性炭颗粒尺寸分布从300～400μm调节至500～600μm,滤除效果仅有微小改善;②除乙醛外,随着活性炭微孔体积和比表面积的增大,滤除效果显著提高;③介孔的引入可进一步提高滤除效果;④以乙二胺为氮源合成的表面官能化的活性炭,可以提高烟气中醛类的选择性滤除效果;⑤在滤嘴中活性炭添加量恒定为60 mg/支的情况下,在ISO条件下抽吸,当滤嘴中活性炭的单位长度添加量由2.5 mg/mm增加至5.0 mg/mm时,醛类的滤除效率有小幅度提高,但在深度抽吸机制下,滤除效率变化不明显;⑥胺基官能化的离子交换树脂(CR20)滤除醛类的选择性比活性炭高。在最大限度滤除主流烟气中的醛类时,物理吸附和化学吸附的滤除机制都很重要。To remove the aldehydes from tobacco smoke by activated carbon used in a cigarette filter, the effects of activated carbon surface area, particle size, pore size and distribution, and surface chemistry have been systematically evaluated for the filtration of aldehydes in mainstream cigarette smoke. A puff-by-puff analysis on selected aldehydes was also carried out to further illustrate the dynamic interaction between activated carbon and the smoke vapours. The aldehydes in smoke of cigarette with filter containing an amine functionalised ion exchange resin, Diaion CR20, was determined to explore the effect of surface chemistry further. The results showed that： Firstly, a change in the activated carbon particle size distribution from 500-600 to 300-400 m, resulted in a small improvement in the filtration performance. Secondly, an increase in activated carbon micropore volume and surface area resulted （with the exception of acetaldehyde） in a higher aldehyde filtration efficiency. Thirdly, the filtration efficiency was further improved using a combination of micropores and mesopores （transport pores）. Fourthly, the activated carbon surface chemistry was modified by increasing the nitrogen content through a synthesis with ethlenediamine, which resulted in an improvement in the selectivity of formaldehyde from the cigarette smoke; this was independent of the porosity, implying that chemisorption played a significant role in addition to physisorption. Fifthly, the position of the activated carbon in the cigarette filter （at a constant weight of 60 mg） showed a small improvement in the aldehyde filtration efficiency under ISO smoking conditions as the activated carbon loading per unit length in the filter rod was increased from 2.5 to 5.0 mg/mm. However under a more intensive smoking regime, there was no observable difference in the filtration efficiency. Finally, an amine functionalised CR20 showed a greater selectivity than that of activated carbon, showing the importance of both physisorption and chem

关 键 词：卷烟 滤嘴 活性炭 离子交换树脂 醛类 选择性滤除 

分 类 号：TS457[农业科学—烟草工业]