Process for manufacturing a mixture of straight-chain higher ethyleneamines and non-straight-chain higher ethyleneamines selected from branched higher ethyleneamines and cyclic higher ethyleneamines, at least in part in the form of urea derivatives thereof, comprising the step of reacting amine-functional compound with ethanolamine-functional compound in the presence of a carbon oxide delivering agent, wherein a) amine-functional compound comprising a combination of straight-chain amine-functional compound and non-straight-chain amine-functional compound is reacted with straight-chain ethanolamine-functional compound, or b) straight-chain amine-functional compound is reacted with ethanolamine-functional compound comprising a combination of straight-chain ethanolamine-functional compound and non-straight-chain ethanolamine-functional compound, or c) amine-functional compound comprising a combination of straight-chain amine-functional compound and non-straight-chain amine-functional compound is reacted with ethanolamine-functional compound comprising a combination of straight-chain ethanolamine-functional compound and non-straight-chain ethanolamine-functional compound, wherein the term amine-functional compound refers to an ethylene amine compound comprising at least two amine groups connected through an ethylene unit with the compound not comprising hydroxyl groups, the term ethanolamine-functional compound refers to an ethylene amine compound comprising at least one hydroxyl group and at least one amine group with at least one hydroxyl group is connected to a primary or secondary amine group through an ethylene unit, the term higher ethyleneamines refers to ethyleneamines containing three or more ethylene units, and the carbon oxide delivering agent is selected from the group of carbon dioxide, urea, alkyl ureas, linear and cyclic alkylene ureas, linear and cyclic carbamates, and organic carbonates, with the proviso that when the reaction is performed in a liquid that comprises water and the amine-functional compound is a mixture of piperazine, ethylenediamine and the cyclic urea of ethylenediamine, the ethanolamine-functional compound is not monoethanolamine, the cyclic carbamate of monoethanolamine (CMEA) or a mixture thereof. a) amine-functional compound comprising a combination of straight-chain amine-functional compound and non-straight-chain amine-functional compound is reacted with straight-chain ethanolamine-functional compound, or b) straight-chain amine-functional compound is reacted with ethanolamine-functional compound comprising a combination of straight-chain ethanolamine-functional compound and non-straight-chain ethanolamine-functional compound, or c) amine-functional compound comprising a combination of straight-chain amine-functional compound and non-straight-chain amine-functional compound is reacted with ethanolamine-functional compound comprising a combination of straight-chain ethanolamine-functional compound and non-straight-chain ethanolamine-functional compound, wherein the term amine-functional compound refers to an ethylene amine compound comprising at least two amine groups connected through an ethylene unit with the compound not comprising hydroxyl groups, the term ethanolamine-functional compound refers to an ethylene amine compound comprising at least one hydroxyl group and at least one amine group with at least one hydroxyl group is connected to a primary or secondary amine group through an ethylene unit, the term higher ethyleneamines refers to ethyleneamines containing three or more ethylene units, and the carbon oxide delivering agent is selected from the group of carbon dioxide, urea, alkyl ureas, linear and cyclic alkylene ureas, linear and cyclic carbamates, and organic carbonates, with the proviso that when the reaction is performed in a liquid that comprises water and the amine-functional compound is a mixture of piperazine, ethylenediamine and the cyclic urea of ethylenediamine, the ethanolamine-functional compound is not monoethanolamine, the cyclic carbamate of monoethanolamine (CMEA) or a mixture thereof.