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Molding process of powdered activated carbon and its spontaneous liquid-gas imbibition performance
- Low-carbon Chemistry and Chemical Engineering Vol. 50, Issue 1, Pages: 111-119(2025)
- 作者机构：
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
- 作者简介：
- 基金信息：
DOI：10.12434/j.issn.2097-2547.20240137
CLC： TQ424.1Published：25 January 2025，
Received：03 April 2024，
Revised：17 April 2024，
- 稿件说明：
移动端阅览
ZHANG SHUO, WU YUTING, XU SHUANGYIN, et al. Molding process of powdered activated carbon and its spontaneous liquid-gas imbibition performance. [J]. Low-carbon chemistry and chemical engineering, 2025, 50(1): 111-119.
ZHANG SHUO, WU YUTING, XU SHUANGYIN, et al. Molding process of powdered activated carbon and its spontaneous liquid-gas imbibition performance. [J]. Low-carbon chemistry and chemical engineering, 2025, 50(1): 111-119. DOI： 10.12434/j.issn.2097-2547.20240137.
摘要
在吸液驱气实验中，粉体多孔材料因密度小、润湿性差，会漂浮在液体表面，限制了液体探针进入其孔隙，导致无法表征其微孔结构。通过将粉体黏结成型，可实现对其微孔结构的吸液驱气表征。选用两种孔隙结构不同的活性炭（AC1和AC2）为原料，以聚偏氟乙烯（PVDF）的N
N-二甲基乙酰胺溶液为黏结剂溶液，将原料粉碎后再黏结成型（经混合、溶剂脱除、压片成型和加热后处理）。利用颗粒强度测定仪、氮气吸附仪、扫描电子显微镜和自制吸液驱气装置等，考察了黏结剂用量和后处理温度对成型活性炭及其颗粒的强度、孔隙结构、吸液驱气行为和微观形貌的影响。结果表明，通过改变黏结剂用量和后处理温度，可以调控黏结剂在粉体孔隙中的分布。优化条件下，AC1和AC2粉体黏结成型的黏结剂用量分别为0.08 g/g和0.10 g/g，后处理温度分别为260 ℃和245 ℃。此时，成型活性炭的强度达55.0 N/cm以上，满足吸液驱气实验要求。成型活性炭颗粒继承了粉体活性炭的微孔结构，其微观形貌与原料活性炭相似，其平衡吸液驱气量与原料活性炭相同。由于少量黏结剂进入粉体的较大孔隙中，导致成型活性炭颗粒初始阶段的吸液驱气速率与原料活性炭颗粒有微小差别。
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 °C and 245 °C
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
Keywords
spontaneous liquid-gas imbibitionpowdered activated carbonmolding with bindermicroporous structure
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