| 摘要 |
Ultrapure or anhydrous hydrazine is produced in a process which comprises distilling aqueous solutions of hydrazine having at least 70 percent by weight of N2H4 at pressures below about 20 millimeters. Aqueous solutions of hydrazine are dehydrated with solid inorganic compounds such as alkali metal hydroxides which are essentially carbon-free. The concentrated hydrazine solution is then distilled at reduced pressures and temperatures which minimize the hazardous conditions present when using processes of the prior art. Monopropellant hydrazine suitable for use in spacecraft engines can be produced having a N2H4 concentration of at least 99.5 percent and less than 5 parts per million of volatile carbonaceous materials.
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