ETHYL CORP BATON ROUGE LA RESEARCH AND DEVELOPMENT DEPT
Long-term storage stability tests were made with slurries of beryllium hydride and organometallic liquid carriers at 90 F. Systems containing triethylaluminum, diethylaluminum hydride, diethylberyllium and triethylborane at 23 ullage evolve gas at 5-15 mmmonth, or 0.6-0.00006 cclb-min. Systems containing trimethylaluminum and dimethylaluminum hydride produce gas at rates of 20-30 mmmonth, or 8-19 cclb-min. The complex BeEt3AlH2 is completely stable but when slurried with beryllium hydride develops pressure at 10 mmmo., or evolves gas at 0.00004 cclb-min. The BeEt2Bh22 complex either alone or mixed with beryllium hydride evolves hydrogen at the rate of about 80 mmmo., or 0.00044 cclb-min. The source of initial gassing was found to be gases mostly nitrogen adsorbed on the surface of the beryllium hydride. A vacuum bake at 130 C followed by treatment with helium largely eliminated initial gassing and improved the material handling properties. Synthesis of BeB3H82 for evaluation as a liquid carrier was attempted unsuccessfully. Standard heats of formation for two compounds were calculated.