Determination of Total Aromatic Plus Olefin

Determination of Saturate Impurities in Aromatics

“…The increased accuracy is probably due to the more insoluble nature of the Cs saturates in the acid mix compared to the C6 and Ci saturates. This agrees xith data presented in the original paper on the acid treat method (6). Saturate impurity tests on pxylene must be run at 15" to 20' C. instead of 0" to 5" C. to prel-ent crystallization of the aromatic…”

Application of subtractive techniques to the analysis of automotive exhaust

“…This laboratory (Bellar et al, 1964) has used silver nitrate-ethylene glycol to separate paraffins and olefins in regular chromatographic analysis. Others (Mayrsohn and O'Neal, 1964;Mills et al, 1948;Ryke et al, 1947;Watt et al, 1954;Watt and Walling, 1955) have used similar materials in somewhat different applications with similar results.…”

Petroleum

“…Kurtz (121) analyzed gasoline for hydrocarbon types by testing distillation fractions for bromine number and solubility in a mixture of phosphorus pentoxide and strong sulfuric acid, and provided methods for, cross checking the data. Mills (166) reported refinements in this procedure for determining total aromatics plus olefins. Berg (19) used a mixture of sulfuric and acetic acids to determine aromatics plus olefins, and claimed this reagent extracts the olefins completely.…”