Effect of Swelling by Organic Solvent on Structure, Pyrolysis, and Methanol Extraction Performance of Hefeng Bituminous Coal.

Abstract

N-methyl-2-pyrrolidone (NMP), pyridine (Py), tetrahydrofuran (THF), and tetralin (THN) were used to swell Hefeng acid-washed bituminous coal (HBCAC). The swelling effect on HBCAC by each solvent is different, among which NMP presented well swelling performance, with a swelling degree of 2.11. FTIR results showed that acid washing and swelling processes presented a marginal effect on HBC, and there was no damage to the macromolecule structure of the coal. TG-DTG profiles of the swollen coals illustrated that the total weight loss of each sample was lower than that of the acid-washing one, while the temperature of the maximum weight loss rate peak was almost unchanged, around 445 °C. Extract yield by methanol followed the order of HBCAC > HBC > HBCAC-NMP (swelled by NMP), showing that acid washing promoted the methanol extraction process, with a higher extract yield of 3.21%, which is twice that of HBC (1.66%).

• Authors: Ya-Ya Ma, Huan-Huan Wang, Wen-Long Mo, Xin-Yang Zhang, Xing Fan, Jun Ma, Feng-Yun Ma, Xian-Yong Wei
• Journal: ACS omega (ACS Omega) Vol. 6 Issue 23 Pg. 14765-14773 (Jun 15 2021) ISSN: 2470-1343 [Electronic] United States
• PMID: 34151058 (Publication Type: Journal Article)
• Copyright: © 2021 The Authors. Published by American Chemical Society.