A Wide Energy Spectra Eddy Model Of Gas-liquid Mass Transfer And The Recovery And Utilization Of The Waste Salt Solution Of Cyclohexane Oxidation

This thesis has two parts. The first one is the gas-liquid mass transfer model.Studying the mechanism of mass transfer is the basic problem about the process of mass transfer in chemical industry. It may predict the velocity of mass transfer in practical process that is helpful to make an appropriate design route, and guide the production.First, the thesis applies the isotropic theory to cope with the turbulence problem that is involved in the model. On this basis, a theoretical model for turbulent liquid phase mass transfer coefficients at a free gas-liquid interface is developed by using the energy distribution of the isotropic turbulence and taking account on all kinds of eddies' effect on mass transfer. Next, the thesis gives the key parameters' calculation methods such as the energy dissipation ?, turbulent intensity u, the length scale of energy containing eddy ?e and Kolmogoroff scale ?. At the same time, the manipulation factors are also discussed, for example temperature and stirred speed.At last, the mass transfer coefficients at a free gas-liquid interface are calculated in the different reactors and systems. It shows the calculation result agree well with the experimental data in the literature. The model is able to reflect all kinds of eddies' effect on mass transfer exactly, so it is also thought of a reasonable and practical model.The second part of this thesis is the recovery and utilization of the waste salt solution of cyclohexanone manufacture. In the manufacture of cyclohexanone by the oxidation of cyclohexane, some by-products would be produced because of about 15~25% cyclohexane oxide deeply. By caustic washing, these by-products discharge from the reactors on the form of the waste salt solutions that include monocarboxylic acids having 1 to 6 carbon atoms, dicarboxylic acids and hydroxy carboxylic acids. The waste saltsolutions are often burned in our country. This disposal not only wastes a great deal of energy and resources, but also produces so much carbon dioxide that pollutes the environment seriously. In the thesis, a new route is proposed on treatment of the waste salt solutions in accordance with the present condition of our country.By experiment, 85% monocarboxylic acids from the waste salt solutions at least are recovered and a new way to deal with hydroxy carboxylic acids is found, which laid foundations for our next work, and has the guidance significance.