为解决分批操作导致产品孔径分布不均、结晶颗粒大、杂质多等问题，提出了将超重力技术与连续碳分工艺相结合制备拟薄水铝石及γ-Al₂O₃的新技术。以CO₂和NaAlO₂为原料，采用错流旋转填料床连续制备拟薄水铝石，考察了NaAlO₂溶液浓度、气液比和超重力因子对拟薄水铝石孔隙性能的影响。对拟薄水铝石进行扩孔改性，焙烧制备了大孔γ-Al₂O₃。随着NaAlO₂溶液浓度、气液比和超重力因子的增大，拟薄水铝石的比表面积和孔容呈先增大后减小的趋势，其最佳制备条件为：NaAlO₂溶液浓度为0.1 mol/L、气液比为3：1、超重力因子为54。对其进行扩孔改性后焙烧，最终得到比表面积和孔容分别为322 m²/g、1.826 mL/g的纳米级大孔纤维状γ-Al₂O₃。研究结果表明，超重力连续碳分法所得产物纯度高、孔径分布均匀、生产效率高，适用于工业放大。

In order to solve the problems such as uneven distribution of pore size,over-large crystal particles and many impurities caused by batch operation in traditional batch carbonation decomposition process,a new technology combining high-gravity technology with continuous carbonization process is proposed for preparing pseudo-boehmite and γ-Al₂O₃.Pseudo-boehmite is prepared by cross-flow rotating packed bed with CO₂ and NaAlO₂ as raw materials.The impacts of the concentration of NaAlO₂ solution,gas-liquid ratio and high-gravity factor on the pore properties of pseudo-boehmite are investigated.Macro-porous γ-Al₂O₃ is prepared through reaming modification and calcination of pseudo-boehmite.With the increases of the concentration of NaAlO₂ solution,gas-liquid ratio and high-gravity factor,the specific surface area and pore volume of pseudo-boehmite increase firstly and decrease then.The optimal preparation conditions are as follows:the concentration of NaAlO₂ solution is 0.1 mol·L^-1,the gas-liquid ratio is 3:1 and the high-gravity factor is 54.The nanometer macro-porous fibrous γ-Al₂O₃ with specific surface area and pore volume of 322 m²·g^-1 and 1.826 ccl·g^-1 respectively is obtained after reaming modification and calcination.The results show that the product obtained by the high-gravity continuous carbonation decomposition method exhibits high purity,uniform pore size distribution and high production efficiency,which is suitable for industrial amplification.

任晓晶(1996-),女,硕士研究生,研究方向为超重力化工过程强化,rxj123321@126.com