A method of manufacturing a polyfunctional amine selected from bis(2-(piperazin-1-yl)ethyl)amine (BPEA), bis(3-(piperazin-1-yl)propyl)amine, bis(4-(piperazin-1-yl)butyl)amine, bis(5-(piperazin-1-yl)pentyl)amine, bis(6-(piperazin-1-yl)hexyl)amine, bis(1-(piperazin-1-yl)propan-2-yl)amine, and bis(2-(piperazin-1-yl)propyl)amine, the method comprising the steps of: (a) providing a reactant composition comprising an amine selected from 2-(piperazin-1-yl)ethanamine, 3-(piperazin-1-yl)propan-1-amine, 4-(piperazin-1-yl)butan-1-amine, 5-(piperazin-1-yl)pentan-1-amine, 6-(piperazin-1-yl)hexan-1-amine, 1-(piperazin-1-yl)propan-2-amine and 2-(piperazin-1-yl)propan-1-amine; and (b) reacting the amine in the reactant composition in the presence of a hydrogenation/dehydrogenation catalyst and hydrogen at a pressure in the range of 100 to 1500 pounds per square inch (700 to 10,000 kPa) under conditions effective to cause the formation of the polyfunctional amine, wherein the catalyst comprises a material selected from platinum, palladium, rhodium, ruthenium, nickel, iron, copper, chromium, molybdenum, cobalt, osmium, and iridium, and the catalyst optionally comprises a metal promoter selected from Group IA, Group IIA, Group IIIA, Group IVA, Group VA, Group VIA, Group IB, Group IIB Group IIIB, Group IVB, Group VB, Group VIB, Group VIIB and Group VIIIB of the Periodic Table (IUPAC format), and metal oxides thereof. bis(2-(piperazin-1-yl)ethyl)amine (BPEA), bis(3-(piperazin-1-yl)propyl)amine, bis(4-(piperazin-1-yl)butyl)amine, bis(5-(piperazin-1-yl)pentyl)amine, bis(6-(piperazin-1-yl)hexyl)amine, bis(1-(piperazin-1-yl)propan-2-yl)amine, and bis(2-(piperazin-1-yl)propyl)amine, the method comprising the steps of: (a) providing a reactant composition comprising an amine selected from 2-(piperazin-1-yl)ethanamine, 3-(piperazin-1-yl)propan-1-amine, 4-(piperazin-1-yl)butan-1-amine, 5-(piperazin-1-yl)pentan-1-amine, 6-(piperazin-1-yl)hexan-1-amine, 1-(piperazin-1-yl)propan-2-amine and 2-(piperazin-1-yl)propan-1-amine; and (b) reacting the amine in the reactant composition in the presence of a hydrogenation/dehydrogenation catalyst and hydrogen at a pressure in the range of 100 to 1500 pounds per square inch (700 to 10,000 kPa) under conditions effective to cause the formation of the polyfunctional amine, wherein the catalyst comprises a material selected from platinum, palladium, rhodium, ruthenium, nickel, iron, copper, chromium, molybdenum, cobalt, osmium, and iridium, and the catalyst optionally comprises a metal promoter selected from Group IA, Group IIA, Group IIIA, Group IVA, Group VA, Group VIA, Group IB, Group IIB Group IIIB, Group IVB, Group VB, Group VIB, Group VIIB and Group VIIIB of the Periodic Table (IUPAC format), and metal oxides thereof. (a) providing a reactant composition comprising an amine selected from 2-(piperazin-1-yl)ethanamine, 3-(piperazin-1-yl)propan-1-amine, 4-(piperazin-1-yl)butan-1-amine, 5-(piperazin-1-yl)pentan-1-amine, 6-(piperazin-1-yl)hexan-1-amine, 1-(piperazin-1-yl)propan-2-amine and 2-(piperazin-1-yl)propan-1-amine; and 2-(piperazin-1-yl)ethanamine, 3-(piperazin-1-yl)propan-1-amine, 4-(piperazin-1-yl)butan-1-amine, 5-(piperazin-1-yl)pentan-1-amine, 6-(piperazin-1-yl)hexan-1-amine, 1-(piperazin-1-yl)propan-2-amine and 2-(piperazin-1-yl)propan-1-amine; (b) reacting the amine in the reactant composition in the presence of a hydrogenation/dehydrogenation catalyst and hydrogen at a pressure in the range of 100 to 1500 pounds per square inch (700 to 10,000 kPa) under conditions effective to cause the formation of the polyfunctional amine, wherein the catalyst comprises a material selected from platinum, palladium, rhodium, ruthenium, nickel, iron, copper, chromium, molybdenum, cobalt, osmium, and iridium, and the catalyst optionally comprises a metal promoter selected from Group IA, Group IIA, Group IIIA, Group IVA, Group VA, Group VIA, Group IB, Group IIB Group IIIB, Group IVB, Group VB, Group VIB, Group VIIB and Group VIIIB of the Periodic Table (IUPAC format), and metal oxides thereof.