The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Octylated asphaltenes (OA), and hexane-soluble n-octyl derivatives of asphaltenes, have been used for the determination of more realistic molecular weight averages and molecular weight distributions (MWD) of asphaltenes. Here we report the synthesis and characterization of the Hamaca OA. Both C-13 and elemental analyses show that about five n-octyl groups per 100 carbon atoms are incorporated into...
Laboratory scale upgrading (demetallization, desulfurization, denitrogenation and increase in the H/C ratio) of Orinoco Belt crude oil and its fractions is described by an electrochemical system in the presence of protonating agents. Hamaca petroporphyrin can be efficiently demetallized (73%) and desulfurized (35%) by electrolysis at about 0.01 A cm -2 in the presence of methanol as...
Use of the simple perturbation molecular orbital (PMO) method allows the first-order estimation of energies of formation (E f ) of polycyclic aromatic hydrocarbons (PAH) as well as their localization (E L ) and bislocalization (E b ) energies. These calculations give theoretical support to experimental evidence in the literature which suggests that massive systems (more than...
The solute-solid adsorption isotherms (SSA) of asphaltenes and resins were measured using the inorganic fraction (97% SiO 2 ) of the deposit that plugged the tubing of a production well as an inorganic adsorbent. In other experiments, Ceuta asphaltenes and the product (HA) of heating them at 350°C for 11 h were used as organic adsorbents in heptane, toluene and heptane-toluene at 26°C. Ceuta...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.