Process and installation for the production of gaseous oxygen and/or gaseous nitrogen under pressure by distillation of air

摘要

All of the air introduced is compressed to a high pressure and then cooled to an intermediate temperature. At this temperature, some of the air is turbined (at 8) at medium pressure, and the rest is liquefied. In order to make it possible to adjust at will the production of oxygen and/or nitrogen in liquid form, an additional cycle fluid withdrawn (at 27) from the double column (11) is heated (at 10), it is compressed (at 3) to a high cycle pressure, it is cooled, a fraction of it is expanded (at 8) with the exertion of external work, and the rest of the compressed additional cycle fluid is liquefied.