Ammonia absorption and recovery projects are not a unique challenge for the Koch Modular process team. They have a high level of experience in this area and with an abundance of existing data, no pilot trials were necessary to design a solution and then guarantee the ammonia absorption system performance. However, there were challenges. The ammonia vapor feed stream was composed of multiple ammonia-containing streams with a variety of compositions. The Koch Modular team worked with the client to agree upon a feed basis for the design of the system. As often occurs, the ammonia recovery project was part of an overall major expansion, and the client requested that the modules be designed to fit indoors both functionally and spatially into the new facility. This request, and the overall scale and building configuration presented some unique design challenges.