Patent Grant
7749344
Not Applicable
Not Applicable
1. Field of the Invention
The present invention relates to a hypergolic rocket fuels that simultaneously possess high-performance propellant characteristics and low toxicity relative to Monomethylhydrazine (MMH). The fuels provide propellant performance as high as or higher than MMH, but have lower toxicity.
2. Description of Related Art
Monomethylhydrazine (MMH) is a widely employed fuel in hypergolic, bipropellant systems. MMH possesses desirable propellant properties but it is highly toxic, carcinogenic, and corrosive. Although gelling has dramatically improved the safety of handling and storing the propellant, its toxicity and carcinogenicity are still of major concern. Therefore, there is a need for alternative liquid hypergolic fuels that are less carcinogenic and less toxic than MMH but also have equal or higher energy densities, lower vapor pressures and ignition delays than MMH. These fuels, like MMH, may be used in the form of gels to further improve safety.
Although DMAZ is hypergolic, its ignition delay with IRFNA is significantly longer than MMH. A longer ignition delay requires a larger combustion chamber to avoid pressure spikes that can damage the engine.
U.S. Pat. No. 6,013,143, incorporated by reference herein in its entirety, discloses three chemicals, each comprising a tertiary nitrogen and an azide functional group that are hypergolic when mixed with an oxidizer such as IRFNA, hydrogen peroxide, nitrogen tetroxide, and hydroxyl ammonium nitrate. The chemicals are dimethylaminoethylazide (DMAZ), pyrollidineylethylazide (PYAZ), and bis (ethyl azide)methylamine (BAZ). Inhibited Red Fuming Nitric Acid (IRFNA) type IIIB and monomethyl hydrazine (MMH) deliver a specific impulse of 284 Ibf sec/Ibm and a density impulse of 13.36 Ibf sec/cubic inch in a rocket engine operating a pressure of 2000 psi. DMAZ, PYAZ, and BAZ are proposed as potential replacements for MMH. DMAZ, under the same conditions as MMH, delivers a specific impulse of 287 Ibf sec/Ibm and a density impulse of 13.8 Ibf sec/cubic inch. The patent discloses the mixing of the hypergolic fuel chemicals with gellants and additives such as aluminum and boron to increase specific impulse and density impulse values.
U.S. Pat. No. 6,926,633, incorporated by reference herein in its entirety, discloses a family of amine azides having cyclic structures and for use as hypergolic rocket propellants. The amine azide compounds comprise at least one amine, including tertiary amines, and an azide functional group pendant from a cyclic structure. The propellants are disclosed as being used with oxidizers and, optionally with catalysts present in fuel or oxidizer. Fuel properties for the amine azides are provided based on computational quantum chemistry calculations.
U.S. Pat. No. 6,949,152, incorporated by reference herein in its entirety, discloses hypergolic propulsion systems comprising a fuel composition and an oxidizer composition. The fuel composition contains an azide compound having at least one tertiary nitrogen and at least one azide functional group. The oxidizer contains hydrogen peroxide in water. The hypergolic reaction between oxidizer and fuel is catalyzed by a transition metal, preferably compounds of cobalt and manganese.
Unlike hypergolic fuels disclosed previously, the present fuels exhibit lower toxicity and higher performance than MMH. The fuels require no catalyst to achieve high performance and are hypergolic with commonly used oxidizers. The fuels of the present invention may be used alone, in combination with each other, or in combination with other fuels in blends.
The present invention is a group of tertiary amine azide chemicals useful as hypergolic fuels for hypergolic bipropellant mixtures. The fuels provide higher density impulses than MMH but are less toxic and have lower vapor pressures that MMH. In addition, the fuels have shorter ignition delay times than DMAZ and other potential reduced toxicity replacements for MMH.
The present invention is a rocket fuel composition comprising one or more of the molecules shown in
First-principle ab initio quantum chemistry methods are the most accurate and suitable technique for calculations of molecular geometries, heats of formations, and activation barriers. Quantum chemistry techniques are based on the principles of quantum mechanics. The procedure numerically solves a many-electron Schrödinger equation to obtain a molecular wave function and energy. The molecular energies can be used to calculate heats of formation.
CBS-QB3 [Ochterski, 1995; Montgomery, 2000] and PBEPBE/6-311++G(d,p) [Perdew, 1996] combined with isodesmonic reaction methods were used to calculate the heats of formations, and activation barriers for the molecules in
Densities
Wong et al. [Wong, 1995] have developed a procedure for calculating molecular volume, defined as the volume occupied by 0.001 au (1 au=6.748 e/Angstrom) electron density envelope. Once the molecular volume is known, the density can be computed using molecular weight. Calculated and known densities were compared for a number of amines and amine azides to validate density calculations.
Calculations were performed at the PBEPBE/6-311++G(d,p) level. Table 2 compares experimentally measured densities with calculated densities with and without corrective correlation. Error! Reference source not found, tabulates the predicted densities of molecules shown in
Specific and density impulse are the two most important parameters describing the performance of a fuel. Density impulse is a measure of the performance per volume of the fuel. Table 4 shows the computed specific and density impulse for each of the molecules shown in
The Isp values were calculated using the PROPER thermochemical code and correspond to the optimum fuel/IRFNA ratio. Table 4 shows that there is a substantial improvement of density impulse over MMH.
Synthesis of Hypergolic Fuels
The molecules of the present invention may be synthesized by those skilled in the art using known chemical synthetic reactions. For example, the synthesis of compound V can be accomplished by the using the known condensation of guanidines with haloacetates [Webb, 2003] followed by reaction with PCl5 and treatment with NaN3. Compound VII can be prepared from 2,4-dichlorotriazine by sequential substitution of the chlorine atoms. The dichloride 5 can be prepared by condensation [Harris, 1981] of iminyl chloride. The preparation of compound XII can be accomplished, for example, by transamination [Flores-Parra, 1999] between two symmetric triazinanes.
The following references are incorporated by reference in their entirety.
The U.S. Government may have certain rights in this invention pursuant to Contract No. W31PQ06C0167 awarded by the U.S. Army
| Number | Name | Date | Kind |
|---|---|---|---|
| 6962633 | McQuaid | Nov 2005 | B1 |
| Number | Date | Country | |
|---|---|---|---|
| 20080202655 A1 | Aug 2008 | US |
