Separation devices for gas mixing

When two fluid streams with different compositions mix, a significant amount of exergy is lost Utilizing the mixing exergy of gaseous streams of different compositions can reduce equipment cost and energy consumption as well as generate electric power. Suitable modification of known separation processes such as distillation, membranes, adsorption, and absorption to convert them into efficient mixing processes is discussed in detail Mixing may also be combined with a separation process such that the same device is used for both purposes which results in the use of the mixing exergy. This combined separation/mixing process is a single and relatively simple device with efficiencies not typically attainable in the generally used two‐step method of separation followed by mixing. For such applications, some is∼ teresting results are presented for the processes using membrane, adsorption and absoqrion devices.