determination of activated carbon to join before and after the join in cigarette smoke volatile) base material, phenolic compounds, 5 kinds of volatile organic compounds (1, 3 butadiene and isoprene, acrylonitrile, benzene and toluene) and aroma composition to release a quantity to change, discusses the structure, the nature of the compound, activated carbon and filtration efficiency of flue gas composition. The results show that the activated carbon has a general filtering effect on flue gas compounds, but the filtering degree of different compounds is different. The filtration efficiency is mainly related to the specific surface area and micropore volume of activated carbon. When the particle size is certain, the filtration efficiency increases with the increase of specific surface area and micropore volume of activated carbon. When the specific surface area and micropore volume are close to each other, the smaller the carbon particle size is, the higher the filtration efficiency of flue gas components is. Microporous high percentage of carbon retention ability of small molecules, of acetaldehyde, 1, 3 - butadiene and isoprene small molecule compounds, such as high filtration efficiency, high percentage and microporous carbon mass transfer resistance is big, such as phenolic half less volatile components of filtering, appropriately increase large and medium hole and transitional channel will increase the filtering of macromolecular compounds. The filtration efficiency was related to the properties of the compounds, especially the molecular weight and boiling point of the compounds. The filtration efficiency of volatile carbon substrate and 5 volatile organic compounds increased with the increase of the boiling point of the molecular weight of compounds. The filtration efficiency of phenolic compounds was significantly lower than that of volatile compounds) and five volatile organic compounds, and the filtration efficiency of binary phenol was lower than that of monophenol. The filtration efficiency of aromatic compounds decreased with the increase of molecular weight boiling point.The effect of the amount and adding method of activated carbon on smoke emission of cigarettes was investigated. It was found that the filtration efficiency of ternary compound filter was higher than that of binary compound filter under the influence of plasticizer when the amount of activated carbon was constant. With the increase of the amount of activated carbon, the filtration efficiency of the two kinds of composite filters increases. The effects of the amount of activated carbon on the filtration efficiency of the compounds with different volatiles are different. The effects of the amount of activated carbon on the filtration efficiency of the isomers are similar due to their close molecular weight and boiling point. When the dosage is small, the competitive adsorption is easy to occur. The adsorption amount of refractory components such as acetaldehyde is small, and the competition can be reduced by increasing the dosage. The filtration efficiency of refractory components shows an obvious upward trend with the increase of the dosage.
It was found that the contents of volatile compounds and flavor components were related to the type of cigarettes and the amount of tar. The contents of volatile compounds and flavor components were higher in the flue-cured cigarettes than in the mixed cigarettes, and higher in the high tar cigarettes than in the low tar cigarettes. The types of fragrance components in smoke of different types of cigarettes are basically the same, but there are great differences in content. The contents of furfural, furfuryl alcohol, maltol, 5-hydroxymethylfurfural, linolenic acid, methyl linolenic acid, linoleic acid, methyl palmitate and other components in flue-cured cigarettes were significantly higher than those in mixed cigarettes. This is related to the higher carbohydrate content in flue-cured cigarettes. Mixed-type cigarettes contain high content of 3-methylpentanoic acid and nitrogen heterocyclic compounds such as cotinine, ho ah, and methamine due to their formulations of burley tobacco and spice tobacco. The filtering law of activated carbon for different types of cigarettes is basically the same, that is, the filtering efficiency is related to the properties of compounds, especially with the molecular weight and boiling point of compounds. The filtration efficiency of activated carbon on flue-cured cigarettes was lower than that of mixed cigarettes.Firstly, the adsorption and desorption isotherms of three activated carbons for coconut shell-based smoke and three activated carbons for apricot kernel based smoke were determined by low temperature nitrogen adsorption method. The specific surface area and total pore volume were calculated by BET model. The microstructure parameters and pore size distribution of micropores and mesopores were calculated by H-K method and BJH method, respectively. The surface morphology of activated carbon was also observed by scanning electron microscope. The results show that the pore structure of activated carbon for commercial tobacco is different at present. Among the six activated carbon samples selected, Y1 and CTN are microporous activated carbon, and the micropore ratio is more than 97%. X3 and X5 samples were medium pore activated carbon with microporosity of only 69.3% and 55.5%. The micropore contents of X2 and Y5 samples were 87.2% and 81.8%, respectively, between X3 and X5 samples and Y1 and CTN samples. SEM observation of the surface morphology of activated carbon samples for smoke showed that the surface of activated carbon was honeycomb-like with developed pores, and the large pores were all in the shape of open pipe structure. There were various small circular and elliptical holes on the pipe wall.
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