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Neutral fraction, homologs

The weight percents of the individual homologs in each specific-Z series (carbon-number distributions) were calculated from LV/EI/MS molecular-ion intensities assuming constant mole sensitivities for each specific-Z series. An invalid factor was inadvertently used in the previous conversion of the LV/EI/MS carbon-number distributions for the asphaltene neutral fraction to carbon-number distributions based on the total liquid. Consequently, the entries in the LV/EI/MS carbon-number distributions for Z(H), Z(O), and Z(S) asphaltene neutral aromatic compounds in References 35 and 47, the total weight percentages of these specific-Z series in References 35, 47, and 48, and the sums of these latter weight percentages reported in all these references should be multiplied by 0.892. [Pg.59]

The IR data, as discussed above, and the molecular formulas for the first homologs in at least the less-negative Z(O) series in Table IV, indicate that furans dominate the oxygen-containing compounds in both the oil and asphaltene neutral fractions. Furthermore, comparison of the Z(H) and Z(O) values in Tables III and IV, respectively, suggests that the furans are phenomenologically derived from the aromatic hydrocarbons by replacement of ring CH2 by O. [Pg.66]

A constant neutral loss (CNL) MS experiment was then used to identify components in the crude ethyl acetate fraction of P. pensylvanicum with structures likely to be homologous to the vanicosides.32 Since the ions derived from a loss of 146 amu (the ketene species derived from the p-coumaryl esters) were the most intense fragment ions in the spectra of... [Pg.173]

Light oils usually comprise the cut up to 200°C. They are first crudely fractionated and agitated at a low temperature with concentrated sulfuric acid, neutralized with caustic soda, and redistilled, furnishing benzene, toluene, and homologs. [Pg.178]

Middle oils, or creosote oils, generally are the fraction from 200 to 250°C, which contain naphthalene, phenol, and cresols. The naphthalene settles out on cooling, is separated by centrifuging, and is purified by sublimation. After the naphthalene is removed, phenol and other tar acids (phenol and its homologs) are obtained by extraction with 10% caustic soda solution and neutralization, or springing by carbon dioxide. These are fractionally distilled. [Pg.178]

However, correction of the partition coefficients for the dissociated fraction may be more appropriate, because the non-specific effects may be attributed solely to the neutral form of the contaminants. The same type of model using substituent constants is furthermore restricted to homologous chemical classes, such as phenols (model 13 in Table 5.7). [Pg.170]


See other pages where Neutral fraction, homologs is mentioned: [Pg.223]    [Pg.718]    [Pg.52]    [Pg.76]    [Pg.79]    [Pg.413]    [Pg.356]    [Pg.273]    [Pg.116]    [Pg.55]    [Pg.293]   
See also in sourсe #XX -- [ Pg.60 , Pg.61 ]




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Neutralization, fraction

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