w e re m o d e r n i z e d at Neftekhimiya Co. As a result of replacing the internal contacts in the towers by valve and centrifugal trays, the output of the towers increased, the quality of separation with production of propylene of 95-98% purity improved, the residual content of propylene in the propane fraction decreased to 7-10%, and the pressure drop in the towers decreased.Neftekhimiya Co., part of Renova Orgsintez Holding Co., has modernized the existing propane-propylene fraction (PPF) separation plant to expand production of propylene.Problems of modernization: • to increase the unit's output to the maximum possible in replacing tower internals;• to improve the quality of separation with production of 95-and 97%-pure propylene and reduce the residual propylene content in the propane fraction to 10%.A comprehensive approach was used to solve these problems, consisting of optimization of the process scheme, selection of optimum process parameters (pressure, temperature, load on boilers), use of highly efficient equipment and modern control systems.A special feature of modernization consisted of replacing only the internals of existing towers with maximum utilization of existing equipment (boilers, condensers, etc.). As a result of a detailed comparative analysis of the internals of different modern domestic and foreign suppliers, high-yield tray equipment developed by Kedr-89 was selected. Two PPF separation process streams were modernized: in the first stream, the K-110.115 slotted tower, in the second, the K-14 tower. The characteristics of these towers and the process parameters of their operation are reported in Table 1.A feature of the modernization was the maximum utilization of existing connections and supporting elements of the "old" internals. Process and hydraulic calculations were first performed and engineering designs for replacing the tower internals were developed at Kedr-89 to ensure the required tower operating indexes. As a result, it was proposed that 90 valve trans be installed in tower K-110, 115, and 106 high-efficiency centrifugal
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