Abstract: Disclosed is an environmentally benign and simplified method for preparing aromatic dicarboxylic acid. In the disclosed method, a mixed solvent composed of aromatic mono-carboxylic acid and water, instead of conventionally used low molecular weight carboxylic acid such as acetic acid, is used as a reaction solvent for an oxidation process; manganese and a small amount of transition metal element are used as catalysts; and carbon dioxide is used as a reaction stabilizer. Accordingly, it is possible to improve the yield and selectivity of the aromatic dicarboxylic acid.

Abstract: Disclosed is a simulated moving bed (SMB) adsorptive separation system in which at least one component of a fluid mixture is brought into contact with a solid adsorbent and the adsorbed component is desorbed with a desorbent, wherein the improvement comprises an inert ball layer is formed on the upper part of the solid absorbent filled in the simulated moving bed.

Abstract: Disclosed herein is a method for treating a waste water comprising a high concentration of organic substances in a stable and controllable manner and an apparatus therefor.The method comprises the steps of determining continuously a dissolved oxygen(DO) within a reactor in which the waste water is biologically degraded by using a continous respiration meter; determining a relationship between a loading rate and a respiration rate by using the DO value transmitted as an electrical signal from the respiration meter, establishing a set loading rate which is optimum for the reactor, and controlling the waste water input flow rate into the reactor in order to maintain a loading rate of the influent waste water is to be close to the set loading rate. The apparatus comprises a continous respiration meter for detecting the DO within a reactor and a control part for determining a relationship between a loading rate and a respiration rate and controlling the waste water input flow rate into the reactor.