طراحي و ساخت سامانه آب فوق بحراني و بررسي واكنش هيدروليز و اكسيداسيون سديم تولوئن سولفونات در آب زير و فوق بحراني در حضور دي اكسيد كربن

چكيده انگليسي :

Design and Manufacturing Supercritical Water System and Study of Hydrolysis and Oxidation of STS in Sub and Supercritical Water in Presence of Carbon Dioxide as a Catalyst and Partial Factorial Design for Optimization Jalal S Razavizadeh Razavi jalal@gmail com April Department of Chemistry Isfahan University of Technology Isfahan IranDegree M Sc Language FarsiDr Hassan S Ghaziaskar ghazi@cc iut ac irAbstract By increasing temperature from boiling point C atm to supercritical condition C bars physical and chemical properties of water continuously change and water becomes a good solvent for performing organic reactions Two main reactions occur in sub and supercritical water SCW namely hydrolysis and oxidation In oxidation reaction organic waste water and oxidant such as air or oxygen at elevated temperature and pressure contact together in homogeneous phase and mass transfer rate is increased in which complete destruction can be achieved in a comparatively short time The main reaction products in SCWO are carbon dioxide and water SCWO is economically attractive for treatment of waste waters that contain organic compounds in concentration of wt in a relatively short time s to min and high efficiencies at much lower temperatures C and without NOx production Generic operational conditions for the two processes are as follows WAO C bar and SCWO C and bar Considering above mentioned conditions for SCWO we needed to design a system enables us to produce this nearly high temperature and pressure This system can provide C temperature and atm pressure thus we can with system provide supercritical condition for different solvents that set in this range for example acetone methanol acetonitrile and others Oxidation with supercritical water SCWO is hydrothermal waste treatment technologies that use critical medium for oxidizing and destruction of organic wastes Sodium toluene sulfonate STS that is extensively used as a hydrotrope and anticaking agent in detergent industries The hydrolysis and oxidation of sodium toluene sulfonate STS in SCW in the presence of CO in a continuous flow reactor at a constant pressure of bar was studied Effect of flow rate of water temperature of the system and the presence of CO in different extent on hydrolysis was investigated Applied partial factorial design for simultaneous study and optimum condition for interaction between three factors namely flow rate of water ranging from to mL min and flow rate of CO ranging from to mL min and temperature ranging from C to C on hydrolysis of STS Hydrolysis of STS increased approximately by increasing temperature and adding CO in to reaction media The mechanism and the procedure for hydrolysis of STS by changing of these three factors and introduce the optimum condition C flow rate of CO flow rate of water were introduced Additionally oxidative decomposition experiments were carried out using hydrogen peroxide as an oxidantfor varying oxidation temperature from to C in constant pressure of bar The stoichiometricconcentration of H O was investigated and different products were monitored in different concentration ofH O Based on these results a reaction mechanism was proposed Key Words Supercritical Water Sodium Toluene Sulfonate STS Hydrolysis Factorial Design

رضوي زاده، جلال

طراحي و ساخت سامانه آب فوق بحراني و بررسي واكنش هيدروليز و اكسيداسيون سديم تولوئن سولفونات در آب زير و فوق بحراني در حضور دي اكسيد كربن

طراحي فاكتوريال