Determination of free sulfuric acid in light-oil sludge

Determination of Sulfuric and Sulfonic Acids in Sour Oil

“…Precipitation (8,12) and volatilization (12) methods of removing thorium may either result in rare earth losses or become tedious when the amount of thorium exceeds milligram quantities. A cellulose column procedure has been used (2,9), but the elutions and subsequent precipitation steps are time-consuming.…”

Analysis of Sulfuric Acid and Acid Sludges from Petroleum Processes

“…Experiments have shown that the aniline salts of the alkyl sulfuric monoesters (2), sulfur dioxide (or sulfurous acid), and ethane-, propane-, and butanesulfonic acids are sufficiently soluble in chloroform to offer no interference in the method. Methanesulfonic acid interferes severely, but is generally absent or negligible in spent acid samples.…”

“…Toluenesulfonic acid shows even less interference. The presence of interfering amounts of sulfonic acids can be detected and avoided by determining the amount of sulfate in the aniline precipitate according to the barium precipitation procedure employed by Bacon (2). Work done by the authors has shown that erratic results are obtained by the aniline method unless at least one mole of water is present for each mole of sulfuric acid.…”

“…THE absorption spectra of ferric sulfate (1, 2) and ferric perchlorate solutions (1, 8-7) have been studied from a theoretical point of view. The former has been attributed to ferric sulfate complex formation (2), and the latter to Fe + + + and Fe(OH)+ + ions, their proportions depending on the acidity of the solution (7). No analytical applications are reported in these papers, and much of the work has been done in a concentration range higher than that of analytical interest.…”