Ultrapure hydrazine production

Details Ultrapure hydrazine production Ultrapure hydrazine production

1986-07-31

1989-02-14

Lacey, David L.

Distillation: processes, separatory

Distilling to separate or remove only water

203 37, 203 73, 423407, B01D 310, B01D 334

Patent

active

048044423

ABSTRACT:
Ultrapure or anhydrous hydrazine is produced in a process which comprises distilling aqueous solutions of hydrazine having at least 70 percent by weight of N.sub.2 H.sub.4 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 N.sub.2 H.sub.4 concentration of at least 99.5 percent and less than 5 parts per million of volatile carbonaceous materials.

REFERENCES:
patent: 2690378 (1954-09-01), Pennemen
patent: 2698286 (1954-12-01), Bircher, Jr.
patent: 2740692 (1956-04-01), Ryker et al.
patent: 2774725 (1956-12-01), Swanson et al.
patent: 2799631 (1957-07-01), Von Hessert et al.
patent: 2803524 (1957-08-01), Deutschman, Jr. et al.
patent: 4013758 (1977-03-01), Osborg
Schmidt, E. W., Hydrazine and Its Derivatives, New York, Wiley-Interscience, 1984 pp. 73-84.

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