Co-current contacting of liq. and gaseous phases - partic. for economical treatment of gaseous effluent from chemical factories

摘要

The gas is passed through a contacting chamber, e.g. a column, at a speed between that corresp. to its value at the transition point of phase inversion and to the multiple, critical point. The speed of liq. flow into the gas is adjusted so that liq. in the emulsion also achieves a speed between that corresp. to the transition point of phase inversion and that corresp. to the multiple, critical point. The gas speed is pref. 5.5-13.5 m/sec. and the rate of introduction of liq. 170-20 kg/cm3. The process is pref. employed for treating a gaseous effluent contg. oxides of nitrogen. The process is also favoured for a carbonation reaction by treating soda with a gas contg. CO2. The liq. phase pref. carries a solid catalyst and the gas is free from dust. Partic. applications include treatment of gaseous effluent from chemical industry operations such as the mfr. of HNO3, H2SO4, HCl, HF, combustion exhaust gases etc. Small proportions of liq. can be employed without mixing into the gas and without entering into underisable chemical reaction with consequent waste of raw material and energy. The danger of vesiculation is avoided.