Determination of Cyclopropane by Selective Absorption

Analysis of Gases by Absorption and Combustion

“…Rubber connections result in errors of two types: A gas may diffuse through the rubber tubing and be lost to the air, producing the effect of a leak, or gas may dissolve in the rubber and later be evolved as a contaminant when a sample of different composition is being analyzed. The work of Branham (8) convincingly demonstrates that rubber tubing connections are undesirable in gas analysis and unpublished work by the authors confirms his findings in every detail. A high degree of flexibility can be achieved by the use of ground-glass spherical joints, and the use of such joints eliminates to a considerable extent the apparent practical need for rubber connections.…”

Catalytic Reactions of Butylamines over Alumina

“…In some of the runs, samples of this gas were analyzed. Butene was absorbed in 87% sulfuric acid and ethylene in 22% sulfuric acid containing 28.5 grams of mercuric sulfate per 100 grams sulfuric acid (2,7). Hydrogen was determined by combustion over copper oxide at 300°C ., and methane, present only in trace amounts, by oxidation over a hot platinum wire.…”

Gas Analysis

“…A selective adsorption procedure is also possible, as cyclopropane is not attacked by an acid mercuric sulfate reagent which adsorbs olefins rapidly. Cyclopropane can be determined in the residue from this treatment, by adsorption in 87% sulfuric acid (42).…”