METHOD FOR SAVING ENERGY IN AROMATIC COMPOUNDS SEPARATION FROM NAPHTHA

摘要

PURPOSE: An energy-saving method is provided to remarkably save energy by reducing an amount of middle pressure steam, C4LPG and et cetera used as a heat source for the existing aromatic compound separation process. CONSTITUTION: Para-xylene absorption separation is performed from a xylene mixture. Waste heat is retrieved from a raffinate column top condenser for separation and retrieval of a desorbent from a raffinate. The retrieved waste heat is supplied as heat source for a raw material of a butane separation column of a platforming process. The retrieved waste heat is supplied as heat source for a raw material of a butane separation column of a platforming process and as heat source for a reboiler of a naphtha hydrogenated sulfuran process stripper. [Reference numerals] (AA) DA-701 O/H condensate; (BB) Thermal load 13.3MMkcal/h; (CC) Saved fuel : 3.6MMkcal/h; (DD) -DA-103 reboil : 1.4MMkcal/h; (EE) -DA-601 reboil : 2.2MMkcal/h;