Preparation and adsorption kinetics of resin adsorbent modified by amine for removing carbon disulfide

doi:10.16085/j.issn.1000-6613.2023-2129

Abstract

Abstract:

The carbon disulfide desulfurization adsorbent was prepared by anchoring active functional groups containing primary and secondary amines onto the resin chain through substitution reaction using chloromethylpolystyrene resin as the carrier and diethylenetriamine as the aminating agent, and the modified resin adsorbent was characterized by FTIR, element analysis, and BET. Subsequently, the adsorption performance of the adsorbent for removing CS₂ from benzene was evaluated, and the adsorption breakthrough curves were obtained at different temperatures and initial concentrations of CS₂. Langmuir and Freundlich models were used to analyze the adsorption isotherms of CS₂ in benzene, and quasi first and quasi second order kinetic models, as well as particle diffusion models, were used to fit the adsorption kinetics. The results showed that the amine modified polystyrene resin had excellent selective adsorption performance for carbon disulfide, with a penetration adsorption capacity of up to 154.17mg/g at the adsorption condition of air-pressure, 318.15K, 1h^-1, 2000mg/L CS₂ in benzene. In addition, the adsorption of CS₂ by the adsorbent conforms to Langmuir model and the quasi second order kinetic model, and the adsorption control step was the reaction between CS₂ and the surface active amino group of the adsorbent, rather than the mass transfer process. By establishing a Y-N dynamic adsorption model for the adsorption process and verifying the adsorption breakthrough curve, the fitted values were in good agreement with the experimental values.

Key words: carbon disulfide, resin, desulfurization, adsorbent, adsorption kinetics

摘要：

以氯甲基聚苯乙烯大孔树脂为载体，二乙烯三胺为胺化剂，通过取代反应将含伯胺和仲胺的活性官能团锚定到树脂链上制得CS₂脱硫吸附剂，采用FTIR、元素分析仪、BET对改性树脂进行表征，并对吸附剂脱除苯中CS₂吸附性能进行评价，得到不同温度及不同CS₂初始浓度下的吸附穿透曲线，采用Langmuir和Freundlich模型对吸附剂吸附苯中CS₂的吸附等温线进行分析，准一级、准二级动力学模型及颗粒扩散模型对吸附动力学进行拟合。结果表明：胺化改性的聚苯乙烯树脂具有优异的选择性吸附二硫化碳性能，其在常压、318.15K、1h^-1、原料CS₂浓度为2000mg/L条件下的穿透吸附容量高达154.167mg/g。同时，该吸附剂吸附CS₂符合Langmuir模型和准二级动力学模型，吸附控制步骤为CS₂与吸附剂表面活性胺基基团的反应，而非传质过程。通过建立动态吸附过程的Y-N吸附模型，并对吸附穿透曲线进行分析验证，拟合值与实验值十分吻合。

关键词: 二硫化碳, 树脂, 脱硫, 吸附剂, 吸附动力学

CLC Number:

TQ424

QIU Yujing, LIU Chang, LIN Jie, LUO Guohua, DAI Xiaobing. Preparation and adsorption kinetics of resin adsorbent modified by amine for removing carbon disulfide[J]. Chemical Industry and Engineering Progress, 2024, 43(12): 7115-7124.

仇玉静, 刘畅, 林杰, 罗国华, 戴晓兵. 胺化改性树脂脱二硫化碳吸附剂的制备及吸附动力学[J]. 化工进展, 2024, 43(12): 7115-7124.

Figures/Tables 16

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分析物	元素质量分数/%
分析物	N	C	H	S
胺化改性树脂	10.85	77.81	7.66	0

分析物	元素质量分数/%
分析物	N	C	H	S
胺化改性树脂	10.85	77.81	7.66	0

样品	BET比表面积 /m²·g^-1	孔体积 /cm³·g^-1	平均孔径 /nm
氯甲基聚苯乙烯大孔树脂	11.668	0.081	27.710
二乙烯三胺胺化改性树脂	18.901	0.098	20.699
45℃吸附饱和后的树脂	19.520	0.095	19.518

样品	BET比表面积 /m²·g^-1	孔体积 /cm³·g^-1	平均孔径 /nm
氯甲基聚苯乙烯大孔树脂	11.668	0.081	27.710
二乙烯三胺胺化改性树脂	18.901	0.098	20.699
45℃吸附饱和后的树脂	19.520	0.095	19.518

c₀/mg·L^-1	308.15K		318.15K		328.15K		338.15K
c₀/mg·L^-1	c_e/mg·L^-1	q_e/mg·g^-1	c_e/mg·L^-1	q_e/mg·g^-1	c_e/mg·L^-1	q_e/mg·g^-1	c_e/mg·L^-1	q_e/mg·g^-1
500	1.000	14.306	1.500	14.292	1.500	14.292	1.000	14.306
1000	3.295	28.575	3.536	28.568	4.051	28.554	2.564	28.596
1500	10.631	42.700	8.467	42.762	8.667	42.756	5.277	42.853
2000	24.852	56.627	18.532	56.808	22.059	56.707	14.610	56.921