Characterization of moisture migration and diffusion in two types of tobacco biomass during the dehydration process by the TG-NMR analysis

Wenkui Zhu; Bo Zhou; Kun Duan; Duoduo Huang; Lifeng Han; Rongya Zhang; Wu Wen; Bing Wang; Bin Li

doi:10.3389/fchem.2024.1367139

Characterization of moisture migration and diffusion in two types of tobacco biomass during the dehydration process by the TG-NMR analysis

Front Chem. 2024 Mar 12:12:1367139. doi: 10.3389/fchem.2024.1367139. eCollection 2024.

Authors

Wenkui Zhu¹, Bo Zhou¹, Kun Duan², Duoduo Huang¹, Lifeng Han², Rongya Zhang³, Wu Wen³, Bing Wang¹, Bin Li¹

Affiliations

¹ Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China.
² China Tobacco Henan Industrial Co., Ltd, Zhengzhou, China.
³ China Tobacco Sichuan Industrial Co., Ltd, Chengdu, China.

Abstract

The tobacco waste generated from the tobacco agriculture and industry, including the discarded stem and leaf, often needs dehydration pretreatment before thermal conversion utilization. In order to study the water activity and migration of tobacco waste during the pretreatment process, TG-NMR (Thermogravimetric Nuclear Magnetic Resonance) was used to obtain the drying curves and LF-NMR (Low Field Nuclear Magnetic Resonance) T2 inversion spectrum at each stage of tobacco drying. Meanwhile, the variation pattern of pore distribution during the dehydration process of two types of tobacco waste has been obtained. Combined with the pore distribution changes, a possible spatial migration mode of water was proposed. The change of adsorption energy of water during tobacco drying was calculated, and verified the above hypothesis. This study results provide reference for the optimization of dehydration pretreatment process for different tobacco waste in order to reduce energy consumption during recycling of tobacco biomass.

Keywords: TG-NMR; adsorption energy; drying; low field nuclear magnetic resonance; moisture statement.

Grants and funding

The author(s) declare that financial support was received for the research, authorship, and/or publication of this article. This research was funded by Financial support from the Science and Technology Project of State Tobacco Monopoly Administration (China National Tobacco Corporation), grant number 212021AA0100.