Novel low-temperature H2S removal technology by developing yellow phosphorus and phosphate rock slurry as absorbent

Yi Mei; Jinfeng Dai; Xujun Wang; Yunxiang Nie; Dedong He

doi:10.1016/j.jhazmat.2021.125386

Novel low-temperature H₂S removal technology by developing yellow phosphorus and phosphate rock slurry as absorbent

J Hazard Mater. 2021 Jul 5:413:125386. doi: 10.1016/j.jhazmat.2021.125386. Epub 2021 Feb 11.

Authors

Yi Mei¹, Jinfeng Dai¹, Xujun Wang¹, Yunxiang Nie², Dedong He³

Affiliations

¹ Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, PR China; Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials, Kunming 650500, PR China; The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming 650500, PR China.
² Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, PR China; Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials, Kunming 650500, PR China; The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming 650500, PR China. Electronic address: YunxiangNie@126.com.
³ Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, PR China; Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials, Kunming 650500, PR China; The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming 650500, PR China. Electronic address: dedong.he@qq.com.

PMID: 33607587
DOI: 10.1016/j.jhazmat.2021.125386

Abstract

Recycling hazardous gas of H₂S is one of the most important strategies to promote sustainable development. Herein, a novel method regarding purifying H₂S is proposed by using yellow phosphorus and phosphate rock slurry as absorbent. The H₂SO₄, formed in situ by H₂S conversion, can be devoted to decompose phosphate rock, and the spent absorption slurry was applied as raw material for the production of phosphorus chemical products. According to the characterization analysis, it was found that H₂S was first oxidized to SO₂ via O₂ as well as O₃ induced by P₄. Subsequently, the generated SO₂ dissolved rapidly in water to form H₂SO₄, and then reacted with the main component of phosphate rock, CaMg(CO₃)₂. Most notably, the active substances, such as, O₃, SO₄^•- and OH•, produced in the reaction process, can oxidize H₂S and HS^- to these sulfur products. In addition, trace amounts of Fe³⁺ and Mn²⁺ that were dissolved from phosphate rock displayed a promotional effect on the formation of active substances. Consequently, as high as 85% of H₂S removal efficiency can be obtained even under acidic condition and low temperature. The proposed H₂S purification method offers a promising option for sulfur recovery and H₂S pollution control.

Keywords: H(2)S; O(3); Phosphate rock; Yellow phosphorus.

Publication types

Research Support, Non-U.S. Gov't