METHOD FOR SAVING ENERGY IN AROMATIC COMPOUNDS SEPARATION FROM NAPHTHA

摘要

PURPOSE: A method for saving energy in an aromatic compounds separation process is provided to remarkably reduce energy consumption using a waste heat from a raffinate column as a reboiler heating source for an LPG column. CONSTITUTION: A method for saving in an aromatic compounds separation process comprises a step of collecting a waste heat from the upper condenser of a raffinate column when separating an aromatic compound which comprises a benzene, toluene, and xylene(BTX), using an extraction column and the raffinate column; and a step of supplying the waste heat as a reboiler heat source of a BTX pre-classification apparatus or a reboiler heat source of an LPG column. [Reference numerals] (AA) LPG column; (BB) Pre-classification apparatus; (CC) Pre-classification apparatus energy reduction: 22MMkcal/h; (DD) Intermediate pressure steam reference: 39t/h; (EE) LPG column energy reduction: 6MMkcal/h