| With the development of economy, the problem of environment pollution has become more and more serious, in which SO2, NOX is primary pollution source from flue gas, and they not only break ecological balance, but also directly do great damage to people's health. It is necessary to remove SO2, NOX from flue gas for protecting environment. In order to find effective method of removal SO2 from flue gas, we select the method of absorbent absorption as a focal point of this paper based on traditional desulfurization technology.According to the present situation that the absorbents of removal SO2 and NOxfrom flue gas are inorganic compound, we adopt a new idea to use organic solvent as flue gas absorbents. In this paper, a liquid organic absorbent (DMSO) is selected in laboratory and will be used to remove SO2 and NOxfrom flue gas to solve industrial problem for flue gas purification. DMSO has not only strong desulfurizing efficiency, but also high regeneration efficiency and good selectivity for SO2, NO^ and CO2,. If adding Mn2T in DMSO. the purification efficiency of the mixed absorbent has been much improved. A pilot experiment was done based on laboratory research; the economy and feasibility about absorbents had been studied. By the discussion of absorption and reaction mechanism for two absorbents, consider that it is physical process that SO2 was absorbed by DMSO, and after adding Mn2· in DMSO, it is both physical absorption and chemical reaction process, so a new technology of two-stage absorption is put forward. A solubility apparatus based on static method was set up, and solubility data of four systems, i.e.,· the solubility of SO2 in DMSO,· the solubility of SO2.s CO2 in DMSO,· the solubility of SO2 in DMSO·Mn2*,· the solubility of SO2 , CO2 in DMSO·Mn2^were measured, most of which were determined for the first time. With the fundamental thermodynamic relation stating that fugacities of a component in coexisting phase are equal at equilibrium, gas-liquid equilibrium model was proposed. The expressions for fugacity coefficient in the gas phase may be obtained from the modification of the Redlich-Kwong equations of state by Soave; The expressions for activity coefficient in the liquid phase may beobtained from NRTL equation. In this model, interaction parameters of NRTL equation were optimized. The correlation results of ternary system using the binary system interaction parameters fit in well with the experimental values.According the need of engineering design of removal SO2, NOX from flue gas with organic absorbent, the solubility of SO2 in DMSO +Mn2+ and SO2., CO2 in DMSO+Mn2 had been determined from 293.15 K to 313.15 K and partial pressure of SO2 from 0.4 kPa to 2.7 kPa. On the basis of contribution to the Helmholtz energy arising from the different ionic and molecular species interactions, the Helmholtz energy arising from the repulsive forces and the attractive forces was taken into account through the new SRK equation of state, the electrostatic interaction and various particles interaction were treated with MSA model and perturbation theory, Thermodynamics model of electrolyte solution suitable to our systems was set up, the correlation results of multi-system using the binary system interaction parameters fit in well with the experimental values.The change of absorbent's viscosity during the course of removal SO2 is one of the fundamental data in engineering design and industrial practice; and the change of absorbent's electrical conductivity during the course of SO2 removal may be become a method of on-line monitor and long-distance control. The data available in literature were only the electrical conductivity and viscosity of pure substance, very few experimental data for this system can be found, and no suitable correlation model for this system can be proposed, so with the need of industrial design, the electrical conductivity and viscosity of absorbent for DMSO and DMSO+Mn2* were measured according to the group statistical theory. The mo...
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