粉煤灰吸附处理废润滑油中水的动力学研究

Kinetics of water in waste lubricating oil adsorbed by flyash

为探索用于废润滑油再生吸附的廉价高效吸附剂,用粉煤灰作为吸附剂对废润滑油进行吸附处理。预处理原状粉煤灰并配制一定浓度以水为单一吸附质的废润滑油,探究其优化的均匀实验条件,考察粉煤灰对废润滑油中水的吸附动力学特性。结果表明,预处理后粉煤灰具备较好吸附特性的物质和结构基础;反应55min时,吸附达到平衡,水的去除率达到91.15%,单位吸附量达到279.745μg/g;动力学数据拟合吸附过程符合准二级吸附速率方程;孔道扩散过程分为初始的快速扩散过程和随后的缓慢内扩散过程,BN=101.629,吸附过程由孔道内扩散主要控制。

In order to explore the low-cost and efficient adsorbents used for waste lubricating oil regeneration by adsorption,flyash was chosen to be absorbent to regenerate waste oil.Original flyash was pretreated,and waste oil with the unique adsorbate of water in some range of concentrations was made up,whose optimum experi-ment conditions were selected,and the kinetic characteristics of the adsorption process of flyash to water in the waste lubricating oil was explored.Experiment results showed that the better material and structural base for pretreated flyash adsorption was equipped.The adsorption equilibrium time was 5 5 min,the removal rate of wa-ter was 91.15%,and the equilibrium adsorption capacity was 279.745μg/g.Linearizations of the different kinet-ic equations showed that adsorption process was in line with pseudo secondary kinetic equation.Pore diffusion process was divided into initial rapid diffusion process and subsequent slow diffusion process,BN=101.629,and the adsorption process was mainly governed by intrapore diffusion process.