Study On The Catalyse Degradation Of Naphthalene (Benzene) Sulfonic Acid In Supercritical Water

The properties of supercritical water(SCW) were presented, the universal research works on the supercritical water oxidation (SCWO) and catalytic supercritical water oxidation (CSCWO) , including reaction pathway of organic pollutant, and the corrosion of reactor in SCWO system were demonstrated. The main influence factors for CSCWO were discussed in this paper.The homogeneous and heterogeneous catalyzed oxidation of organic pollutants in SCW were studied under the different pH and with activated carbon as catalyst. The results showed that the addition of NaOH can accelerate the decomposition of amino benzene sulfonic aicd in SCWO system , the effects of NaOH on the decomposition of e -acid (3,8-disulfonic acid naphthol) in SCW or SCWO, and amino benzene sulfonic aicd in SCW were negligible. The catalytic effect of activated carbon as catalyst can enhance the reaction rate and its weight decreased for activated carbon itself was oxidized in the reaction field.The concentrations of various metals ion in the effluent for corrosion of the reactor were monitored by Inductively Coupled Plasma Atomic Emission Spectrometry(ICP-AES). The pH of waste water and temperature affected corrosion of the reactor to be observed, and the pH of reaction medium was mian factor.It was found that catalysts existed in the form of deposition in homogeneous catalyzed oxidation, the following model was used to explain the dissolution of catalysts:MyXz(s)+nH2O MyXz nH2O (sup ) ,and the results were correlated with In[MyXZ H2O]=n(ln55.5+lnρH2O)+lnKs, it indicated that at the same temperature, the plots the logarithm of solubility vs. the logarithmof the density of water yielded as traight line.The SCWO products ofε-acid were analyzed and identified systematically by GC-MS and ion chromatograph. The following model could be used to show the oxidative degradation pathway of ε -acid organic pollutants in SCWO :The application prospect and engineering problems of CSCWO were discussed deeply. The problems of Corrosion, catalyst and mechanism are very important for its development .