BTX mixture

Ueno, Y., Horiuchi, T., Tomita, M., Niwa, O., Zhou, H., Yamada, T., Honma, I., Separate detection of BTX mixture gas by a microfluidic device using a function of nanosized pores of mesoporous silica adsorbent. Anal. Chem. 2002, 74,... 

Benzene and toluene, the simplest aromatic hydrocarbons obtained from petroleum refining, are useful starting materials for synthetic polymers. They are two components of the BTX mixture added to gasoline to boost octane ratings. 

Uchrin CG, Katz J. 1991. Transport of a BTX mixture in a groundwater aquifer material. Bull Environ Contam Toxicol 46(4) 534-541. 

MacEwen et al. (1977) indicated that tumor-susceptible ICR CF-1 female mice and tumor-resistant CAF1-JAX female mice exposed to coal tar aerosol-BTX mixture continuously for 90 days at concentrations of 0, 0.2, 2, and 10 mg/m3 developed skin tumors at 2 and 10 mg/m3, respectively. In the ICR CF-1 strain mice, tumors continued to develop for as long as 86 weeks postexposure. Skin tumor incidences in ICR CF-1 mice exposed to 0, 0.2, 2, and 10 mg/m3 coal tar aerosol-BTX mixture for 90 days were 3 of 225 (1%), 1 of 61 (2%), 14 of 75 (19%), and 44 of 55 (80%), respectively. Skin tumor... 

Tumor-susceptible ICR CF-1 and tumor-resistant CAF1-JAX mice were exposed to 10 mg/m3 coal tar aerosol-BTX mixture continuously, or for 90 days, or intermittently for 18 months (MacEwen et al. 

BTX are chemically reduced compounds, thus, their biologic oxidation is thermodynamically favored (Table 7). Many biological attempts have been conducted in order to remove these volatile organic compounds from the environment. Aerobic treatments have been widely proposed for BTX elimination (Duetz et al, 1994 Haigler et al., 1992 Rozkov et al., 1998 Yerushalmi et al., 1999). Removal of BTX mixtures appeared to be favored at aerobic conditions (Deeb Alvarez-Cohen, 1999 Prenafeta-Boldu et al., 2002) however, negative effects such as inhibition or catabolic repression have also been reported at these conditions... 

In their study, Zepeda et al. (2006) reported that the nitrifying sludge was able to completely consume benzene (6.5 mg C/1), toluene (5 mg C/1), and m-xylene (5 mg C/1) over 21 h. Specific rates of BTX consumption are presented in Table 6. These results indicate that for initial concentrations below 6.5 mg C/1, toluene and m-xylene disappeared faster from the cultures than benzene, which appeared to be most persistent. This is in accordance with the fact that benzene at low concentrations was the highest inhibitory compound on nitrification. Individually as in BTX mixtures, the nitrifying consortium presented the following sequence of biotransformation m-xylene > toluene > benzene. However, in mixtures, significant differences in the values for specific rates of BTX compounds removal were found. The work of Zepeda et al. (2007) emphasizes the importance for considering the possible component interactions in the biotransformation of mixed BTX compounds in nitrification systems. 

Table 11. Kinetic data of BTX consumption at different concentrations of BTX mixtures at...

FIGURE 13.52 Typical chromatogram of sulfolane in BTX mixture extracted from Iragi Powerformate. Peak identifications are 1, n-pentane 2, cw-2-pentene 3, 2-methyl-2-butene 7, n-hexane 8, benzene 9, cyclohexane 10, 2,4-dimethylpentane 11, toluene 12, m- and p-xylene 13, o-xylene 14, n-propylbenzene 15, ferf-butylbenzene 16, isobutylbenzene 17, sulfolane. (Reprinted with permission from Reference 122, Journal of Chromatographic Science, Copyright 1979, Preston Publications, A Division of Preston Industries, Inc.)... 

The simplest aromatic hydrocarbon is benzene. The six-membered ring and three n bonds of benzene comprise a single functional group. Benzene is a component of the BTX mixture (B for benzene) added to gasoline to boost octane ratings. 

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