The Preparation Of Fe-AC Reconstituted Tobacco And Its Application In Reducing Cigarette Tar

Many compositions produced by smoking cigarette such as nicotine and tar are harmful to human health, There have been a lot of researches in tobacco industry to reduce the risk of smoking. Considering the speciality of cigarette, we have prepared a kind of Fe-active carbon (AC) reconstituted tobacco that can reduce the tar in the main-stream smoke of cigarette.In this paper, it is proved that adding 5 wt % of coconuts carbon in cigarette can raise the burning temperature of cigarette and reduce 9.73% and 23.76% of tar and nicotine respectively.Based on the researches of coconuts carbon, another additive Fe-AC reconstituted tobacco was prepared and used to reduce the cigarette tar. It can reduce 16.76% and 32.04% of tar and nicotine respectively.The effects of Fe-AC reconstituted tobacco on reducing cigarette tar and nicotine are depend on the conditions, such as preparing method of Fe and AC, pH value and the purity of the raw materials. In reducing cigarette tar, the Fe-AC prepared by the method of deposition-precipitation performs better than the Fe-AC prepared by the method of mixing. The Fe-AC prepared at pH=12 has a better effect than the Fe-AC prepared at pH=5. Impurities of Fe2(SO4)3 reagent have negative influence in reducing cigarette tar. The effect of reducing tar is also related to the content of Fe in the Fe-AC. Increasing the content of Fe in the Fe-AC, the efficiency of reducing cigarette tar increases until the content of Feincreases up to 26.2%.The obtained hydroxides of Fe prepared at pH=12 and pH=5 are characterized by XRD patterns, which indicate that both of them are non-crystal phase or amorphous phase. Treated them at 300C in air, the hydroxide of Fe prepared at pH=12 is easily transformed to a -Fe2O3, and the hydroxide of Fe at pH=5 is transformed to a -FeO(OH). XRD analysis were carried on the cigarette ashes, which showed that both the two different hydroxides transformed to a -Fe2O3. The new formed a -Fe2O3 in cigarette suggests they can promote the burning of cigarette and reducing the tar.Thermal gravity analysis (TG) of the above two different hydroxides indicate that the difference is obvious, in the weight-loss. The hydroxide of Fe prepared at pH=12 loses less than that at pH=5. Weight loss of the former mainly occurs in the zone of 60-300C and the residual mass is 85.86%. Weight loss of the latter occurs in the zone of 60-300C and 500-800C, and the residual mass is 74.72%. The results show that their decomposition process are different.The results of XRD analysis and TG analysis indicate that the precursors of Fe hydroxides prepared at different pH value are different.TG analysis of the cigarette has showed the weight loss occurring in the zone of 130-380 C of cigarette is different. TG analysis indicate that the cigarette with Fe-AC reconstituted tobacco prepared at pH=12 loses 46.8% and that at pH=5 loses 50.16%, but the common cigarette loses 52.49%. Because theforming of cigarette tar is mainly in the zone of 130-380C, the weight loss occurring in this zone is related to forming tar. The more weight loses, the more tar produces.Analysis on semi-volatility compositions in cigarette tar has been found that the quantity of compositions in the cigarette with Fe-AC reconstituted tobacco is less than that of the cigarette without Fe-AC reconstituted tobacco. The amount of the cigarette with additive of Fe-AC is 74.08 ug/cig, and the common cigarette is 79.98 ug/cig.In order to the Fe-AC reconstituted tobacco is suitable for producing, the fiber used in the traditional reconstituted tobacco was replaced by the mixture of long wood fiber and short wood fiber. The ratio of long wood fiber to short wood fiber in the mixture is 1:2 .The content of the mixture in the reconstituted tobacco is 6 wt%.