Accession Number : AD0871792

Title :   Study of the Basic Kinetics of Decomposition of MMH and MHF and the Effects of Impurities on their Stability.

Descriptive Note : Quarterly rept. no. 4, 16 Mar-15 Jun 70,

Corporate Author : STANFORD RESEARCH INST MENLO PARK CA

Personal Author(s) : Ross, David S. ; Kirshen, Norman A. ; Hendry, Dale G.

Report Date : 15 JUN 1970

Pagination or Media Count : 18

Abstract : The reactions of MMH (Monomethylhydrazine) with oxygen, soluble metal ions and methyl radicals have been studied. The reaction between MMH and oxygen in the gas phase has been studied in three separate experiments. The results clearly indicate that at room temperature the reaction is stoichiometric and that CH3N=NH is the initial product. The reaction is complete in a manner of minutes. At 319C, in an experiment in which the initial O2:MMH ratio was 1:6, all of the MMH disappeared with a surprisingly large quantity of hydrogen as a product. A chain-type process, possibly explosive, is implicated here. Experiments were performed in which soluble metal ions were in solutions with MMH in the ratio MMH:ion=90:1. The decomposition of MMH in the presence of Fe(III), Fe(II), Cu(II), Ni(II), Zn(II), Mn(II), and Mg(II) is immeasurably slow at room temperature. At 319C, however, MMH decomposition is total for the first four ions within three hours. The iron and nickel ions are reduced to the native metals. The introduction of methyl radicals into a sample of MMH at 319C does not initiate long chain reactions, but rather results in a stoichiometric 1:1 decomposition of the material. (Author)

Descriptors :   *DECOMPOSITION), (*METHYL HYDRAZINES, IMPURITIES, REACTION KINETICS, OXYGEN, FREE RADICALS, METALS, PYROLYSIS, LIQUID ROCKET PROPELLANTS.

Subject Categories : Physical Chemistry
      Liquid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE