Determination of phthalic esters in propellants

Determination of Phthalate Esters in Propellants

“…One of the most difficult problems associated with the analysis of propellants has been the elimination of inter-ferences due to nitrate esters and aromatic nitro compounds. The Lamond (7) procedure, which employs ammonium sulfide for the reduction of the nitrated compounds, is rather involved. The Mullaly (< §) technique, based on the earlier work of Dickson and Easterbrook (2) involves the reduction of nitroglycerin and nitro compounds with methanolic ferrous chloride.…”

New Method for Determining Phthalate Esters in Propellants

“…The earliest, the lead phthalate gravimetric method, proposed by Thames (12), is complicated and has been proved to be theoretically incorrect (10). The method of Lamond (5) applies an ammonium sulfide reduction procedure in order to separate the phthalates from the nitroesters and nitroaromatic bodies. It is, however, lengthy and time consuming because of the numerous operations involved in the separation of phthalates from the nitroesters and nitroaromatic bodies, as well as in the preparation of the ammonium sulfide reagent, according to the special requirements of the method.…”