Determination of Butadiene in Gases

Determination of Gaseous Olefins or Hydrogen by Catalytic Hydrogenation

“…The only two compounds likely to be found are acetylene and butadienes, and these can be determined separately by saturated potassium mercuric iodide (3) and maleic anhydride (11), respectively.…”

Determination of Conjugated Diolefins with Chloromaleic Anhydride

“…Moreover, a simple chemical method requiring no special equipment appeared desirable lor the routine determination of conjugated dienes in the crude products from cracking experiments. Consequently, a number of reagents were considered which included bromine (4, 7), sulfur dioxide (10,12), aromatic diazonium coumpounds (11), cuprous chloride (9), maleic anhydride (3,12), and chloromaleic anhydride. All these reagents except the last two either proved nonspecific for conjugated dienes or did not react quantitatively.…”

“…Samples containing smaller amounts of isoprene should be heated at higher temperatures and/or for longer periods of time-for example, samples containing 5 10% should be heated for 4 hours at 750 C. Butadiene reacts more slowly than isoprene and it is necessary to heat the samples at 55 °C. for 12 hours to obtain satisfactory results. Isoprenebutadiene mixtures containing 5 to 10% butadiene require 6 to 8 hours at 55°C.…”

Determination of Butadiene in Presence of Other Unsaturated and Saturated Gaseous Hydrocarbons

“…At the present time the usual method of analysis for butadiene is based on its reaction with molten maleic anhydride at 100°C. (2,6). When butadiene exists in the presence of other gases, such as isobutene, butenes, and butanes, a single absorption cannot be used,'since the gases associated with the butadiene will be absorbed by the maleic anhydride, giving incorrect results.…”