Determination of Individual Acetylenes in Butadiene and in C₄ Hydrocarbon Fractions

Determination of Acetylenic Hydrogen by Means of Concentrated Silver Solutions

“…Samples containing halogens have also been analyzed by filtering off the precipitated silver halide through a coarse paper, followed by titration of the liberated acid in the filtrate. Although the metathesis of silver acetylides by halides has been reported (7), no such interference would likely be involved here, since the relatively high concentration of silver ion precludes the possibility of excess (free) halide ions. The noninterference of aldehydes is presumably due to the fact that the pH of the solution is never maintained at a high value sufficiently long to reduce silver ion.…”

Volumetric Analytical Methods for Organic Compounds

“…The method is accurate to 1 to 2% in all compounds tested with the exception of diisobutylene, where the results were consistently 6% high. Acetylenes and monosubstituted acetylenes have been determined in the presence of butadiene (69) and in the presence of other four-carbon hydrocarbon fractions (128) by precipitation of the acetylenes with silver nitrate in ethyl alcohol followed by titration of the liberated nitric acid.…”

Elastomers

“…As little as 0.02% of ethylacetylene (1-butyne) and vinylacetylene (l-buten-3-yne) can be determined separately and quantitatively in mixtures with other C4 hydrocarbons by a relatively simple procedure, which involves precipitation with alcoholic silver nitrate, titration of the liberated nitric acid for total acetylenes, recovery of the acetylenes by treatment with aqueous potassium bromide, followed by bromometric analysis (150).…”