Abstract
Naphtha reformate is extracted for aromatic compounds and the aromatics are separated into benzene, toluene and xylene in sequence. This separation is conducted using a series of binary-like columns. In this study, the first two columns of the separation process are replaced with a fully thermally coupled distillation column (FTCDC) also known as the Petlyuk column. Though feed of the process contains 18 components, the FTCDC developed for the separation of a ternary system is effectively implemented in the industrial-scale application. A structural design to determine the optimum structure of the column from the minimum tray configuration is utilized, and the minimum tray configuration is found from the stage-to-stage computation with ideal tray efficiency in equilibrium condition. The operating condition to yield a given set of product specifications is found from the HYSYS simulation. The performance of the FTCDC is compared with a conventional two-column process to indicate an energy saving of 13% and the investment cost reduction of 4%.
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