Process of making 3-aminopentanenitrile
View Patent ↗A process for making 3-aminopentanenitrile from a crude 2-pentenenitrile (“crude 2PN”) comprising 2-pentenenitrile, 2-methyl-2-butenenitrile, and 2-methyl-3-butenenitrile includes contacting the crude 2PN with an ammonia-containing fluid and water. The ammonia-containing fluid can include at least one reactant selected from the group consisting of ammonia, aqueous ammonia, and ammonium hydroxide.
1. A process for making 3-aminopentanenitrile, comprising (a) contacting (i) a crude 2-pentenenitrile (“crude 2PN”) that may include 2-pentenenitrile in combination with one or more of 2-methyl-2-butenenitrile and 2-methyl-3-butenenitrile, with (ii) an ammonia-containing fluid, and (iii) water, using a molar excess of ammonia with respect to 2-pentenenitrile content of crude 2PN in the range of 10% to 20%, to produce a reaction mixture,
wherein
the 2-penetenenitrile is cis-2-penetenenitrile, trans-2-penetenenitrile, or a mixture of cis-2-penetenenitrile and trans-2-penetenenitrile, and
the ammonia-containing fluid comprises at least one member selected from the group consisting of ammonia, aqueous ammonia, and ammonium hydroxide, and
(b) maintaining the concentration of water in the reaction mixture in the range of 15 wt % to 60 wt %, based on the total weight of the reaction mixture.
2. The process of claim 1 , wherein the ammonia-containing fluid comprises aqueous ammonia comprising 19 wt % to 29 wt % ammonia.
3. The process of claim 1 , wherein the molar excess of ammonia with respect to 2-pentenenitrile content of crude 2PN is 15%.
4. The process of claim 1 , wherein the process is carried out in a reactor at a temperature in the range of 25° C. to 135° C., preferably 80° C. to 110° C., and at a pressure in the range of atmospheric pressure to 1500 psig.
5. The process of claim 1 , wherein the crude 2PN comprises greater than 50 wt % 2-pentenenitrile, preferably 65 wt % to 75 wt % 2-pentenenitrile, based on the total weight of the crude 2PN.
6. The process of claim 1 , wherein the concentration of water in the reaction mixture is maintained in the range of 25 wt % to 40 wt %, based on the total weight of the reaction mixture.
7. The process of claim 1 , wherein the reaction mixture further includes at least one added solvent selected from the group consisting of dioxane, tetrahydrofuran, dimethylformamide, dimethylacetamide, methanol, isopropanol, and butanol.
8. The process of claim 1 , further comprising (c) boiling off impurities to isolate 3-aminopentanenitrile.
9. The process of claim 8 wherein yield of 3-aminopentanenitrile is 85% or greater.
10. The process of claim 8 , wherein greater than 90% of the 2-pentenenitrile content of crude 2PN is converted to 3-aminopentanenitrile.