Isomerization of tetrahyd rotricyclopentadienes to missile fuel
View Patent ↗Tetrahydrotricyclopentadienes are isomerized to a low pour point, high energy missile fuel. Aluminum trichloride is the catalyst and an inert chlorinated hydrocarbon solvent is present. The mole ratio of AlCl 3 to the diene is in the range between from about 0.005 to about 1.0. The isomerization temperature is in the range from between about −20° C. to about 25° C.
1. Process for isomerizing tetrahydrotricyclopentadiene comprising:
(a) contacting tetrahydrotricyclopentadiene with anhydrous aluminum trichloride at a temperature range between from about −20° C. to about 25° C., and in the presence of an inert chlorinated paraffin solvent wherein the aluminum trichloride is present in a mole ratio of trichloride to tetrahydrotricyclopentadiene in the range between from about 0.005 to about 1.0;
(b) continuing said contacting until isomerization of the diene is sufficient to form a low pour point, high energy missile fuel; and
(c) recovering the missile fuel.
2. Process according to claim 1 wherein in addition the contacting occurs in the presence of an amount of anhydrous hydrogen chloride effective to enhance the rate of isomerization.
3. Process according to claim 2 wherein the missile fuel is separated from the contacting materials.
4. Process according to claim 1 wherein the missile fuel has a pour point of less than 0° C.
5. Process according to claim 4 wherein the missile fuel has a density (20/4° C.) in the range between from about 1.044 to about 1.02.
6. Process according to claim 5 wherein the contacting occurs in the presence of an amount of anhydrous hydrogen chloride effective to enhance the rate of isomerization and the aluminum dichloride is present in a mole ratio of aluminum trichloride to tetrahydrotricyclopentadiene in the range between from about 0.05 to about 0.25, and the missile fuel is separated from the contacting materials.
7. Process according to claim 6 wherein the temperature range is between from about −10° C. to about +20° C.
8. Process according to claim 7 wherein the suitable inert solvent is selected from the group consisting of methylene dichloride, tetrachloroethane and pentachloroethane.
9. Process according to claim 8 wherein the amount of anhydrous hydrogen chloride is in the range between from about 1000% to about 5% of that necessary to saturate the contacting materials.
10. Process according to claim 1 wherein sludge, from a previous isomerization of the tetrahydrotricyclopentadiene, fortified with a small quantity of fresh aluminum trichloride is used to contact and isomerize a subsequent amount of tetrahydrotricyclopentadiene.