An efficient ten-fold concentration of combined nickel and vanadyl porphyrins in crude oil is obtained by liquid column chromatography with disposable macroporous silica gel. The concentrate contains the biomarker metalloporphyrins based on chromatographic and spectral comparisons with etioporphyrin-I standard compounds. The concentrate is free of asphaltene materials that would otherwise cause major chromatographic interference. The procedure, begins with one gram of crude oil sorbed on top of a column containing 5 grams of 500 Angstrom pore size silica gel. The initial elution is with petroleum ether:methylene chloride (97v:3v) to remove saturated and aromatic hydrocarbons. The metalloporphyrins are eluted next with methyl acetate while the remaining asphaltene components are immobilized. In a second step, 100 Angstrom silica gel is used to further separate the metalloporphyrins. The method is rapid and is applicable to processing large numbers of samples.
|Original language||English (US)|
|Title of host publication||ACS Symposium Series|
|Editors||Royston H. Filby, Jan F. Branthaver|
|Number of pages||21|
|State||Published - 1987|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)