Keywords: Tamarix indica, Monocyclic naphthene, 1D-NMR and MS techniques, Chloroform.
In the present study, to the best of our knowledge, two new monocyclic naphthene derivatives (1 and 2) along with seven known compounds were isolated for the first time from the plant.
To study the components in the asphalt binder in depth, the asphalt binder was separated into aliphatics, naphthene aromatics, polar aromatics, and asphaltenes according to the Corbett method , which is a mainstream method in the field of crude oil.
The glass transition temperature (Tg) of naphthene aromatics is around -20[degrees]C, which is consistent with that of the bitumen parent; hence, at the same temperature, naphthene aromatics have a higher viscosity than the aliphatics due to its Tg [71, 72].
, what is the most popular cycloalkanes applied in the industry maybe cyclohexane, a colorless liquid, which is easy to volatile and burn.
Monocyclic naphthene derivatives 84 and 85, terpenes 86-95, flavonoid 96, flavonoid glycosides 97-102 and some other compounds 103-107 are also reported.
Monocyclic Naphthene Derivatives Ferheen and co-workers in 2005 isolated cyclohexanedocosanol (84) and cyclohexan- etetracosanol (85) from methanolic extract of H.
For TLA, the ratio of naphthene
aromatic: polar aromatic : asphaltene is approximately equal to one, unlike the other asphalts, which generally have a low proportion of asphaltenes compared with aromatics (Chattergoon et al., 1992).
Apart from continuing to break the heteroatomic functional groups and side chains, forming small quantity of water, carbon dioxide and nitrogen, the main reaction is breaking of a large number of C-C bonds, including ring-opening and rupture of naphthene
. So, the yield of liquid hydrocarbon decreases rapidly, and the yield of macromolecular oil products (> [C.sub.25]) drops to zero gradually (Tables 3 and 4).
Gasoline is the major transportation fuel in the United States and includes n-alkanes, iso-alkanes, naphthenes, olefins, aromatics, and oxygenated groups with different distributions depending on the season, market place, crude source, and refinery processes.
Cycloalkanes (also known as naphthenes) constitute a significant portion of conventional diesel, jet fuel, and gasoline (up to 35%, 20%, and 15% by volume, respectively).