Accession Number : AD0378265

Title :   STABILITY OF LMH-2 IN LIQUID CARRIERS.

Descriptive Note : Final rept. 1 Mar 65-31 May 66,

Corporate Author : ETHYL CORP BATON ROUGE LA

Personal Author(s) : Frey,F. W. ; Marlett,E. M. ; Becker,W. E. ; Shepherd,L. H.

Report Date : AUG 1966

Pagination or Media Count : 19

Abstract : The compatibility of pyrolytic beryllium hydride (Beane product) with various liquid organometallic compounds was evaluated by measuring the rate of pressure rise of slurries of beryllium hydride in these liquids in a closed system at 90 F. Methyl and ethyl derivatives of beryllium, boron and aluminum and their complexes with beryllium hydride, were tested for compatibility with beryllium hydride. All systems were characterized by an initial rapid pressure rise, followed by a levelling off until a constant rate of pressure increase was established. The initial large pressure rise has been attributed to desorption of gases(nitrogen) adsorbed on the beryllium hydride surface and can be minimized by baking the beryllium hydride in vacuo and storing it under helium. Of the liquids tested, the smallest pressure rise was obtained with diethyl-beryllium. Its rate of pressure rise closely approached the allowable limit, tentatively established for slurry fuel systems. However, the BeH2-Et2Be slurry became completely solid during the course of the compatibility testing period. This latter phenomenon precludes consideration of this system as a slurry fuel unless the solidification problem can be eliminated. The standard heats of formation of the complexes, Be(Et3AlH)2 and Be(Et2BH2)2 were measured to be -67.3 + or - 10.4 and -74 + or - 40 kcal/mole, respectively. The large errors arise from inaccuracies in the values for the heats of formation of diethylaluminum hydride and triethylborane. (Author)

Descriptors :   (*HYDRIDES, STABILITY), COMPATIBILITY, SYNTHESIS(CHEMISTRY), HEAT OF FORMATION (U) *BERYLLIUM COMPOUNDS, *METALORGANIC COMPOUNDS, *COMPLEX COMPOUNDS, *ALKANES, *ALUMINUM COMPOUNDS, *DIBORANES, *SLURRY FUELS, *BOROHYDRIDES

Subject Categories : Liquid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE