Naphtha is one of the important oilproducts. It is mainly used in the ethylene production through steamcracking and the aromatic extraction and also as raw material forchemical products such as ammoniaand hydrogen. With the increaseddemand for polyolefins such as polyethylene and polypropylene andaromatics such as benzene, tolueneand xylene, the demand for naphthain the world is getting larger andlarger.