In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Henry Kister wrote numerous books on the design and operation of this type of process. It is possible to adjust equilibrium behavior to observed behavior in this type of process using an efficiency calculation named after Murphree, and Hengstebeck diagrams can be used for troubleshooting when multiple components are present. Stanislaw Wasylkiewicz developed a model using bifurcation theory to determine effectiveness of two sequential processes of this type running at different pressures. A one-stage related process is called a (*) flash unit, and the upper portion of columns where this process occurs is known as the rectifying section. When multiple components are present the bulk separation in this process is targeted between a light and a heavy key. It's not adsorption, but its pressure-swing form or addition of entrainers can be used to break azeotropes. For 10 points, name this technique for separating components by volatility, often conducted in multi-trayed columns.
Science