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Molar Excess Volume of Butyl Acetate with Cyclohexane or Aromatic Hydrocarbons at 298.15 K
Sanjeev Maken,Ankur Gaur,Naveen Verma,K. C. Singh,Seungmoon Lee,박진원 한국공업화학회 2007 Journal of Industrial and Engineering Chemistry Vol.13 No.7
Molar excess volume (VE) of butyl acetate [BAc](A) + cyclohexane (B), +benzene (B), +toluene (B), +o-, +m- and +p-xylene (B) were measure at 298.15 K over the entire composition range with v-shaped dilatometer. The VE values for binary mixture containing cyclohexane or benzene were found to be positive, while these were negative for the BAc + toluene, +o-, +m- and +p-xylene over the entire composition range. The VE values for an equimolar mixture vary in the order: cyclohexane > benzene > toluene o-xylene > m-xylene > p-xylene. The results are qualitatively explained in terms of the breaking and stretching of dipole-dipole interactions in self-associated BAc and the formation of attractive interactions between polar carboxyl group of butyl acetate and π-electrons of aromatic hydrocarbons.
박진원,Soon Young Min,Ankur Gaur,Sanjeev Maken,Jang Soo Hyun 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.2
In this study, we melted four types of waste asbestos containing material such as spread asbestos, plasterboard asbestos, slate asbestos and asbestos 99 wt%, in a melting furnace at 1,450-1,550 that uses a mixture of hydrogen and oxygen (Brown’s gas) as a fuel. More volatile components (CaO, K₂O) are enriched in spread asbestos, plasterboard asbestos, and slate asbestos, while less volatile compounds (SiO₂, Fe₂O₃, MgO) remain in asbestos 99%. Through basicity of raw materials, spread asbestos, plasterboard asbestos, and slate asbestos were found to have more alkalinity, and asbestos 99% was found more acidic. SEM and EDX results revealed that all raw materials had various kinds of asbestos fiber. Spread asbestos, plasterboard asbestos, and slate asbestos were considered as tremolite asbestos, whereas asbestos 99% was considered as chrysotile asbestos. It was further confirmed by SEM and XRD studies that all waste materials contained some crystalline structures which transformed into amorphous glassy structure on melting. Also, in case of added glass cullet during the melting of spread asbestos, it transformed the raw material into a perfect vitrified product having more glassy surface and amorphous in nature