Desulfurization Performance of Polyethylene Polyamine Supported on Modified Clay†

doi:10.7503/cjcu20160895

Abstract

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

CLC Number:

O647

TrendMD:

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

Figures/Tables 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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