低碳化学与化工2025，Vol.50Issue(1)：111-119,9.DOI:10.12434/j.issn.2097-2547.20240137
粉体活性炭成型工艺与吸液驱气性能
Molding process of powdered activated carbon and its spontaneous liquid-gas imbibition performance
张硕 1吴宇婷 1许双印 1徐绍平 1胡耀明 2汤历斌2
作者信息
- 1. 大连理工大学 化工学院,辽宁 大连 116024
- 2. 池州山立分子筛有限公司,安徽 池州 247115
- 折叠
摘要
Abstract
In the spontaneous liquid-gas imbibition experiment,powdered porous materials tend to float on the liquid surface due to their low density and poor wettability,which restricts the liquid probe from entering their pores,making it impossible to characterize their microporous structure.By molding the powdered material using a binder,the spontaneous liquid-gas imbibition characterization of its microporous structure can be achieved.Two types of activated carbon(AC1 and AC2)with different pore structures were selected as raw materials.A solution of polyvinylidene fluoride(PVDF)in N,N-dimethylacetamide was used as the binder solution.The raw materials were crushed and then molded using a process that involved mixing,solvent removal,tableting and heat treatment.A particle strength tester,nitrogen adsorption analyzer,scanning electron microscope and self-made spontaneous liquid-gas imbibition device were used to investigate the effects of binder dosage and post-treatment temperature on the strength,pore structure,behavior of spontaneous liquid-gas imbibition,and microstructure of the molded activated carbons and their particles.The results show that the distribution of the binder within the pores of the powder can be regulated by adjusting the binder dosage and post-treatment temperature.Under optimized conditions,the binder dosages for molding AC1 and AC2 powders are 0.08 g/g and 0.10 g/g,respectively,and the post-treatment temperatures are 260 ℃ and 245 ℃,respectively.At this point,the strength of the molded activated carbons exceeds 55.0 N/cm,meeting the requirements for spontaneous liquid-gas imbibition experiments.The microporous structure of the molded activated carbon particles is inherited from the powdered activated carbon,and their microstructure is similar to that of the raw activated carbon.The molded activated carbon particles'equilibrium volumes of gas displaced by liquid reach the same level of that of the raw activated carbon.Due to a small amount of binder entering the larger pores of the powder,the initial rate of the spontaneous liquid-gas imbibition in the molded activated carbon particles shows a slight difference compared to that of the raw activated carbon particles.关键词
吸液驱气/粉体活性炭/黏结成型/微孔结构Key words
spontaneous liquid-gas imbibition/powdered activated carbon/molding with binder/microporous structure分类
化学化工引用本文复制引用
张硕,吴宇婷,许双印,徐绍平,胡耀明,汤历斌..粉体活性炭成型工艺与吸液驱气性能[J].低碳化学与化工,2025,50(1):111-119,9.
