In Situ Infrared spectroscopy Studies on Vacuum Residua

摘要

The hydrogen bond of asphaltene in vacuum residua is studied by use of in situ FT-IR spectroscopy the intensity of hydrogen bonding in different sample is investigated through the absorptioon band of hydrogen bond on IR spectra The conclusion is attained that the function of hydrogen bondings is one of the main fact of the associationin asphaltene molecules Through the studies of IR spectra of the mixture of 1-methyl naphthalene and n-heptane it is found that there exists a linear relation between the ratio of absorbance of IR bands at 1460cm~-1 and 1380cm~-1 and the ratio of methylene and methyl groups in the mixtures A correlation equation is proposed and by use of the equation the n_CH2_CH3 ratio of vacuum residues can be converiently calculated from their Ir spectra And In IR spectroscopy of vacuum residua of this paper the extent of peripheric substitution in aromatic rings of asphaltenes could be expressed by the ratio of the areas of the bands at 670-900cm~-1 adn 1600cm~-1 in IR spectra.