改性黏土负载多乙烯多胺对H2S的高效捕集

doi:10.7503/cjcu20160895

摘要/Abstract

摘要：

以工业建材级黏土矿石粉为原料, 经酸处理或煅烧改性后, 利用其多孔性负载多乙烯多胺制得吸附材料, 并考察了其硫化氢脱除性能. 实验结果表明, 经400 ℃煅烧改性的材料的硫化氢脱除效果最佳. 考察了负载方法、吸附温度、水蒸气预处理和负载量等因素对吸附的影响, 发现在较低温度以及预加湿的情况下, 硫化氢的脱除效果最显著, 脱除率接近100%. 负载量为33.3%的吸附剂的穿透硫容及饱和硫容均优于其它负载量的吸附剂. 再生实验表明, 吸附剂可以在较低温度下轻易再生, 且多次再生后脱硫效果无显著下降. 红外光谱和比表面积测试结果表明, 该吸附剂对硫化氢的吸附以化学吸附为主.

关键词: 硫化氢, 黏土, 多乙烯多胺, 吸附, 改性

Abstract:

Clay powder was modified by calcination and hydrochloric acid treatment, respectively, and then loaded with polyethylene polyamine. The desulfurization performance of the adsorbent was detected by dynamic H₂S adsorption experiment. The results showed that calcination treatment under 400 ℃ is most favorable to H₂S removal. A relatively low adsorption temperature and water vapour pretreatment are beneficial to the improvement of desulfurization performance of adsorbent. The H₂S removal rate can reach 100%. The optimal loading amount of polyethylene polyamine is 33.3%. The regeneration performance of adsorbent was also explored, and the result showed that the adsorbent can be recycled for several times without significant decline of desulfurization capacity. The infrared spectroscopic and specific surface area analysis showed that H₂S is adsorbed mainly via chemical absorption.

Key words: H2S, Clay, Polyethylene polyamine, Adsorption, Modification

中图分类号:

O647

TrendMD:

刘新鹏, 王睿. 改性黏土负载多乙烯多胺对H₂S的高效捕集. 高等学校化学学报, 2017, 38(7): 1235.

LIU Xinpeng, WANG Rui. Desulfurization Performance of Polyethylene Polyamine Supported on Modified Clay^†. Chem. J. Chinese Universities, 2017, 38(7): 1235.

图/表 9

Fig.1 XRD patterns of the clay before(a) and after calcination(b—e)Temperature/℃: b. 300; c. 400; d. 500; e. 600. f. palygorskite-(Mg,Al)5(Si,Al)8O20(OH)2∙8H2O(PDF No.21-0958); g. montmorillonite-Ca0.2(Al,Mg)2Si4O10(OH)2∙4H2O(PDF No.13-0135).

Fig.2 FTIR spectra of adsorbents before(a) and after loading polyethylene polyamine(b) (B) Enlarged part spectra of (A).

Fig.3 SEM images of sorbent before(A, C) and after(B, D) loading polyethylene polyamine Images (C) and (D) are the enlarged images of (A) and (B), respectively.

Fig.4 Effect of modification method on the desulfurization performance of sorbent(20 ℃)

Fig.5 Effect of adsorption condition on the desulfurization performance of sorbenta. Without steam, 20 ℃; b. with steam, 20 ℃; c. with steam, 35 ℃; d. with steam, 50 ℃.

Fig.6 Desulfurization performance(A) and sulfur capacity(B) of sorbents with different mass fractions of polyethylene polyamine(20 ℃)

Fig.7 FTIR spectra of GATP-33.3PEPA before(a) and after H2S adsorption(b) (B) Enlarged part spectra of (A).

Fig.8 Effect of temperature on the regeneration performance of sorbent

Fig.9 Regeneration performance of sorbent for several cycles

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改性黏土负载多乙烯多胺对H₂S的高效捕集

Desulfurization Performance of Polyethylene Polyamine Supported on Modified Clay^†

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