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利用膜气液接触器制备了纳米CaCO3、SrCO3、Al(OH)3和Al2O3粒子.根据气液反应理论预测了Ca(OH)2浓度、CO2分压等对CO2吸收速率的影响规律,并得到了实验验证.在实验条件下,Ca(OH)2浓度和CO2分压对CaCO3粒子的形貌影响较小,粒径约为70nm.添加PVP和PEG后,粒度降为48nm左右,分散性明显提高.所得SrCO3纳米粒子为球形,粒度均匀,Sr(OH)2浓度对粒子粒度具有明显影响.Al(OH)3粒子为球形,50nm左右,煅烧后得到Al2O3,粒子尺寸增加至70nm左右.反应后用稀盐酸清洗膜使之再生,膜重复使用9次,膜传质系数未见明显降低.
The nano-CaCO 3, SrCO 3, Al (OH) 3 and Al 2 O 3 particles were prepared by gas-liquid contactor.According to the gas-liquid reaction theory, the influence laws of Ca (OH) 2 concentration, Experimental results show that under the experimental conditions, Ca (OH) 2 concentration and CO2 partial pressure have little effect on the morphology of CaCO3 particles, and the particle size is about 70nm.With the addition of PVP and PEG, the particle size is reduced to 48nm and the dispersibility is obvious (OH) 2 particles have a spherical shape, about 50nm, after calcination, Al2O3 is obtained, and the size of the particles increases to about 70nm. The reaction of the resulting SrCO3 nanoparticles is spherical with uniform particle size and the concentration of Sr (OH) After the membrane was washed with dilute hydrochloric acid to make it regenerate, the membrane was reused 9 times, and the membrane mass transfer coefficient was not significantly reduced.