The application of two-phase composite absorbent systems consisting of BAD and seawater resources in the wet treatment of ship exhaust gas

Junxiong Zhao; Yan Yang; Huirui Li; Shengchao Xu; Qifeng Wei; Xiulian Ren

doi:10.1016/j.isci.2023.106472

The application of two-phase composite absorbent systems consisting of BAD and seawater resources in the wet treatment of ship exhaust gas

iScience. 2023 Mar 23;26(4):106472. doi: 10.1016/j.isci.2023.106472. eCollection 2023 Apr 21.

Authors

Junxiong Zhao^{1

2

3}, Yan Yang^{1

2

3}, Huirui Li^{1

2

3}, Shengchao Xu^{1

2

3}, Qifeng Wei^{1

2

3}, Xiulian Ren^{1

2

3}

Affiliations

¹ School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China.
² School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong 264209, China.
³ Shandong Institute of Shipbuilding Technology, Institute of Shipping Oil Residue and Oily Sewage Clean Technology, Weihai, Shandong 264209, China.

Abstract

The impact of ship emissions on the environment cannot be ignored and should be controlled. The possibility of applying seawater electrolysis technology and a novel amide absorbent (BAD, C₁₂H₂₅NO) to the simultaneous desulfurization and denitrification of ship exhaust gas is entirely confirmed by using various seawater resources. Concentrated seawater (CSW) with high salinity can effectively reduce the heat generated during electrolysis and the escape of chlorine. The initial pH of the absorbent can greatly affect the NO removal capacity of the system, and the BAD could keep the pH range suitable for NO oxidation in the system for a long time. The use of fresh seawater (FSW) to dilute the electrolysis of concentrated seawater (ECSW) to make an aqueous oxidant is a more reasonable scheme; the average removal efficiencies of SO₂, NO, and NOx were 97.10%, 75.41%, and 74.28%, respectively. The synergistic effect of HCO₃ ^-/CO₃ ^2- and BAD was shown to further restrict NO₂ escape.

Keywords: Chemical engineering; Chemistry; Environmental chemical engineering.