This research activity shows the possibility to further intensify air separation units (ASUs). Several modifications to the traditional process layout are proposed and simulated by means of well-established simulation suites. The proposed modifications deal with the upgrading of oxygen purity, the recycle of rich argon stream, and the possibility to generate energy. The novel process solutions are compared with the traditional process and techno-economic assessment is provided. The payback time on the revamping investment is estimated in the order of 5 years for Terni’s ASU, owned by Linde Gas Italia S.r.l., which has been selected as test-case.
