期刊
JOURNAL OF MAGNETIC RESONANCE
卷 331, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2021.107054
关键词
Quantitative NMR Spectroscopy; Medium-field NMR; Benchtop Instruments; Mixture Analysis; External Standard; Frother; Process Water
资金
- New Zealand Ministry of Business, Innovation and Employment [UOCX1502]
- Queensland Government
- New Zealand Ministry of Business, Innovation & Employment (MBIE) [UOCX1502] Funding Source: New Zealand Ministry of Business, Innovation & Employment (MBIE)
This study investigates the quantification of a commonly used frothing agent, MIBC, in process water of a coal preparation facility using a benchtop NMR. Solid phase extraction and high-field NMR techniques were utilized to accurately determine MIBC concentration and recovery rate. The quantum mechanical model effectively excluded the interference of diesel on the NMR signal, resulting in quantification error within acceptable limits.
This paper investigates the use of a benchtop NMR for quantification of a commonly used frothing agent, methyl isobutyl carbinol (MIBC) in the process water of a coal preparation facility. Solid phase extraction is used to increase the concentration of MIBC in the sample so that it is quantifiable by a benchtop NMR. A polymeric, reversed phase column with methanol as solvent gives a MIBC recovery rate of 67 +/- 4% as determined using 400 MHz high-field NMR. The recovery rate consistently falls in the above narrow range even in the presence of diesel and inorganic electrolytes which are likely present as background chemicals in the process water. Using the average MIBC recovery rate, we use a quantum mechanical model to analyse the intensity of MIBC in the benchtop spectra. The quantum mechanical modelling algo-rithm effectively excludes the effect of the diesel on the measured NMR signal. The quantification error when the inlet concentration of MIBC is between 1 and 12 mg/L (1.2-15 ppm v/v), is within 0.5 mg/L (0.6 ppm v/v). (c) 2021 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据