Preparation and adsorption performance of adsorbents for removing carbon disulfide from benzene

doi:10.16085/j.issn.1000-6613.2024-0631

Abstract

Abstract:

Resin desulfurization adsorbent was prepared by grafting organic amines on chloromethyl polystyrene macroporous resin (D201) for removing trace CS₂ in benzene. Effects of preparation method including amine type, washing method and mass ratio of resin to amine on the adsorption performance were studied. Besides, relations between performance and absorption conditions such as temperature, space velocity and CS₂ concentration of raw material were also investigated. Adsorption mechanism of the absorbent was revealed by the results from BET, organic element analyzer and Fourier transform infrared spectroscopy (FTIR). It was shown that thioic acid was initially generated by CS₂and primary-amine and secondary-amine functional groups on the absorbent. Then, it converted to cyanide isosulfate and finally to thiourea as thioic acid was unstable. As a result, trace CS₂ in benzene was removed. The D201-EDA adsorbent prepared by grafting ethylenediamine on D201 exhibited excellent penetration adsorption capacity and saturated adsorption capacity of 183.33mg/g and 200.78mg/g, respectively, when it conducted at 45℃ under atmospheric pressure with volume space velocity of 1h^-1 and feed CS₂ concentration of 2000mg/L.

Key words: polystyrene resin, organic amines, desulfurization adsorbent, benzene, carbon disulfide

摘要：

采用氯甲基聚苯乙烯大孔树脂（D201）作为接枝载体，通过接枝有机胺类物质制得胺化改性的树脂脱硫吸附剂，并用于脱除苯中微量CS₂；对有机胺类型、洗涤方式、树脂与有机胺质量比等制备条件以及吸附温度、吸附空速、原料CS₂浓度等工艺条件对吸附剂吸附性能的影响进行了考察；采用BET、有机元素分析仪、傅里叶变换红外光谱（FTIR）对吸附剂进行了表征，并对吸附机理进行了分析。研究表明：胺化改性树脂的吸附过程是通过表面伯胺及仲胺基官能团与CS₂反应生成硫代酸，硫代酸不稳定分解生成异硫酸氰酯，继而生成硫脲而被选择吸附下来。在吸附温度为45℃、常压、体积空速为1h^-1、进料CS₂浓度为2000mg/L的条件下，采用D201接枝乙二胺制得的D201-EDA吸附剂的穿透吸附容量和饱和吸附容量分别高达183.33mg/g和200.78mg/g。

关键词: 聚苯乙烯树脂, 有机胺, 脱硫吸附剂, 苯, 二硫化碳

CLC Number:

TQ424

QIU Yujing, LIU Chang, LUO Guohua, DONG Sen, LI Jianhua. Preparation and adsorption performance of adsorbents for removing carbon disulfide from benzene[J]. Chemical Industry and Engineering Progress, 2025, 44(4): 2374-2382.

仇玉静, 刘畅, 罗国华, 董森, 李建华. 脱除苯中二硫化碳吸附剂的制备及其吸附性能[J]. 化工进展, 2025, 44(4): 2374-2382.

Figures/Tables 15

References 30

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洗涤方式	树脂种类	穿透时间/h	穿透吸附容量/mg·g^-1	饱和吸附容量/mg·g^-1	N质量分数/%	Cl质量分数/%
水洗	D201-EDA	42.00	175.00	202.99	12.31	15.10
碱洗	D201-EDA	44.00	183.33	200.78	12.92	0

洗涤方式	树脂种类	穿透时间/h	穿透吸附容量/mg·g^-1	饱和吸附容量/mg·g^-1	N质量分数/%	Cl质量分数/%
水洗	D201-EDA	42.00	175.00	202.99	12.31	15.10
碱洗	D201-EDA	44.00	183.33	200.78	12.92	0

有机胺种类	吸附剂	穿透时间/h	穿透吸附容量/mg·g^-1	饱和吸附容量/mg·g^-1	N质量分数/%
DETA	D201-DETA	42.50	177.08	191.57	12.48
EDA	D201-EDA	44.00	183.33	200.78	12.92

有机胺种类	吸附剂	穿透时间/h	穿透吸附容量/mg·g^-1	饱和吸附容量/mg·g^-1	N质量分数/%
DETA	D201-DETA	42.50	177.08	191.57	12.48
EDA	D201-EDA	44.00	183.33	200.78	12.92

胺化原料配比m(D201)∶m(EDA)	吸附剂	穿透时间/h	穿透吸附容量/mg·g^-1	饱和吸附容量/mg·g^-1	N质量分数/%
1∶1	D201-EDA	41.00	170.83	183.58	12.04
1∶2	D201-EDA	44.00	183.33	200.78	12.92
1∶3	D201-EDA	40.00	166.67	179.08	11.75
1∶4	D201-EDA	40.00	166.67	180.40	11.75
1∶6	D201-EDA	39.00	162.50	176.21	11.46