Abstract The preparation of oil-soluble metal carbonate colloids is of interest in the area of lubricant additives. This study presents a novel mass-transfer intensified approach for efficient preparation of monodisperse CaCO3 nanoparticles as overbased nanodetergents based on W/O microemulsion using a high-gravity rotating packed bed (RPB) reactor. The effects of high gravity level, gas-liquid ratio, gas and liquid flow rates were systematically investigated. The as-prepared products had good transparency, an average particle size of about 6 nm, a high storage stability of over 18 months, a solid content of 38.5 wt% and a highest total base number (TBN) of 417 mgKOH/g. As compared to conventional stirring tank reactor (STR), the product prepared in the RPB reactor had better monodispersity and stability, smaller average particle size, narrower size distribution and higher TBN. Furthermore, the RPB reactor had a greatly shortened carbonation reaction time from 120 min of STR to 53 min, increasing the production efficiency by about 56%.

中文翻译：

---

在高重力旋转填充床反应器中高效制备单分散 CaCO 3 纳米颗粒作为高碱性纳米洗涤剂

摘要 油溶性金属碳酸盐胶体的制备在润滑油添加剂领域备受关注。本研究提出了一种新的传质强化方法，用于使用高重力旋转填充床 (RPB) 反应器有效制备单分散 CaCO3 纳米粒子作为基于 W/O 微乳液的高碱性纳米洗涤剂。系统地研究了高重力水平、气液比、气液流速的影响。制备的产品具有良好的透明度，平均粒径约为6 nm，超过18个月的高储存稳定性，固含量为38.5 wt%，最高总碱值（TBN）为417 mgKOH/g。与传统的搅拌釜反应器（STR）相比，RPB反应器制备的产品具有更好的单分散性和稳定性，平均粒径更小，更窄的粒度分布和更高的 TBN。此外，RPB 反应器的碳酸化反应时间从 STR 的 120 分钟大大缩短到 53 分钟，生产效率提高了约 56%。