1
|
Yoshida K, Doi A, Yoshioka H, Hirano T, Nakahara M. Nuclear Magnetic Resonance Analysis of Hydrothermal Reactions of Ethyl- and Octylamine in Sub- and Supercritical Water. J Phys Chem A 2023; 127:3848-3861. [PMID: 37093710 DOI: 10.1021/acs.jpca.3c01213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2023]
Abstract
Hydrothermal reactions of aliphatic amines have recently gained importance in relation to the application of amines as film-forming corrosion inhibitors for steam-water cycles. The kinetics and mechanism of the hydrothermal reactions of ethylammomiun cation (EtAH+) and n-octylammonium cation (OctAH+) were studied for comparison with the corresponding neutral amines to elucidate their reaction products and pathways at sub- and supercritical temperatures of 300-400 °C as model reactions of aliphatic ammonium cations. We analyzed the reaction of 13C-15N-labeled EtAH+ using NMR spectroscopy and revealed that the initial hydrolysis to ethanol, known as the main path, is followed by the elimination reaction producing ethene and the disproportionation reaction giving diethylammonium cation. The OctAH+ yields octene and octanol, each of which isomerizes to thermodynamically more stable species as the major products. Comparisons were made between the reactions of the neutral amines and ammonium cations to highlight their different reactivity. The hydrolysis, alkene formation, and dehydration of alcohols to alkenes were all found to be accelerated at low pH. The formation of low-molecular-weight organic acids such as acetic acid and formic acid was not observed. These results indicate that the corrosion protection effect of film-forming amines will be maintained under practical conditions with pH values as high as around 9 to 10, and hence side reactions involving byproducts will be suppressed.
Collapse
Affiliation(s)
- Ken Yoshida
- Department of Applied Chemistry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1, Minamijyousanjima-cho, Tokushima, 770-8506, Japan
| | - Ayato Doi
- Department of Applied Chemistry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1, Minamijyousanjima-cho, Tokushima, 770-8506, Japan
| | - Haruka Yoshioka
- Department of Applied Chemistry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1, Minamijyousanjima-cho, Tokushima, 770-8506, Japan
- Kurita Water Industries Ltd, 3993-15 Haijima-cho, Akishima, 196-0002, Japan
| | - Tomohiro Hirano
- Department of Applied Chemistry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1, Minamijyousanjima-cho, Tokushima, 770-8506, Japan
| | - Masaru Nakahara
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, 611-0011, Japan
| |
Collapse
|
2
|
Lee JW, Lee SH, Yoon SJ, Yoon JH. Spectroscopic investigation, cage occupancy, and gas storage capacity of hydroquinone clathrates formed with H2S-N2 and COS-N2 binary gas mixtures. KOREAN J CHEM ENG 2017. [DOI: 10.1007/s11814-017-0184-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
3
|
Park J, Kang SP, Lee JW. 13C NMR analysis of C2H6+C2H4+THF mixed hydrate for an application to separation of C2H4 and C2H6. KOREAN J CHEM ENG 2016. [DOI: 10.1007/s11814-016-0068-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
4
|
Zhang XX, Xiao P, Zhan CH, Liu B, Zhong RQ, Yang LY, Sun CY, Liu H, Pan Y, Chen GJ, Li N. Separation of Methane/Ethylene Gas Mixtures Using Wet ZIF-8. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b00941] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiao-Xin Zhang
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, P. R. China
| | - Peng Xiao
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, P. R. China
| | - Chang-Hua Zhan
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, P. R. China
| | - Bei Liu
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, P. R. China
| | - Rui-Qin Zhong
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, P. R. China
| | - Lan-Ying Yang
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, P. R. China
| | - Chang-Yu Sun
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, P. R. China
| | - Huang Liu
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, P. R. China
| | - Yong Pan
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, P. R. China
| | - Guang-Jin Chen
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, P. R. China
| | - Nan Li
- State Key Laboratory of Heavy
Oil Processing, China University of Petroleum, Beijing 102249, P. R. China
| |
Collapse
|