Influence of Solvents, Oil Temperature, and Incubation Period on Membrane Patch Color

In recent years, the varnish caused by turbine oil oxidation products has become a serious problem in thermal power generation plants. In our laboratory, we have developed a varnish diagnosis method that uses membrane patch colorimetry for evaluating varnish potential. Membrane patch color is influe...

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Autores principales:	Tomohiko Kon, Tomomi Honda, Akira Sasaki
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2018
Materias:	membrane patch colorimetry oxidation product microscopic fourier transform infrared spectroscopy in-situ analysis Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/6a82d440d639424abcb058c1e48c5974
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spelling	oai:doaj.org-article:6a82d440d639424abcb058c1e48c59742021-11-05T09:18:59ZInfluence of Solvents, Oil Temperature, and Incubation Period on Membrane Patch Color1881-219810.2474/trol.13.225https://doaj.org/article/6a82d440d639424abcb058c1e48c59742018-10-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/13/5/13_225/_pdf/-char/enhttps://doaj.org/toc/1881-2198In recent years, the varnish caused by turbine oil oxidation products has become a serious problem in thermal power generation plants. In our laboratory, we have developed a varnish diagnosis method that uses membrane patch colorimetry for evaluating varnish potential. Membrane patch color is influenced by filtering conditions such as mixing solvent, oil temperature, and incubation period. It is important to understand the influence of these conditions on the patch color and oxidation products to properly evaluate oxidation products using membrane patch colorimetry. Hence, this study aims to investigate these conditions by using two experiments. First, we conducted a filtration test on sample oils that were filtered under different conditions, in which we altered the mixing solvent, oil temperature, and incubation period to investigate their influence on membrane patch color. Then, we investigated the behavior of oxidation products versus heating time, incubation period, and oil temperature using an in-situ analysis of a microscopic fourier transform infrared spectroscopy (FT-IR). In the filtration test, the membrane patch color became darker with increasing incubation period. Additionally, the results also indicated that the membrane patch color became brighter when the sample oil and solvent were mixed and/or the oil temperature was high. From the in-situ analysis using the microscopic FT-IR in the case of a heating process, the peak of 1710 cm-1, which is an absorption band of carboxylic acid (-COOH), shifted to a higher wave number. In the case of a holding process, the peak of 1710 cm-1 shifted to a lower wave number. Overall, the results suggest that the oxidation products became low-molecular owing to cleavage of hydrogen bond and easy solubility in turbine oil when the oil temperature was high, and that the oxidation products became high-molecular by hydrogen bonding and difficult to dissolve in turbine oil when the sample oil was cooled and stored. Moreover, from the behavior of the oxidation products at different temperatures in the in-situ analysis, the cleavage of hydrogen bond of oxidation products in turbine oil ended after reaching at least 60–70°C.Tomohiko KonTomomi HondaAkira SasakiJapanese Society of Tribologistsarticlemembrane patch colorimetryoxidation productmicroscopic fourier transform infrared spectroscopyin-situ analysisPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 13, Iss 5, Pp 225-231 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	membrane patch colorimetry oxidation product microscopic fourier transform infrared spectroscopy in-situ analysis Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	membrane patch colorimetry oxidation product microscopic fourier transform infrared spectroscopy in-situ analysis Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Tomohiko Kon Tomomi Honda Akira Sasaki Influence of Solvents, Oil Temperature, and Incubation Period on Membrane Patch Color
description	In recent years, the varnish caused by turbine oil oxidation products has become a serious problem in thermal power generation plants. In our laboratory, we have developed a varnish diagnosis method that uses membrane patch colorimetry for evaluating varnish potential. Membrane patch color is influenced by filtering conditions such as mixing solvent, oil temperature, and incubation period. It is important to understand the influence of these conditions on the patch color and oxidation products to properly evaluate oxidation products using membrane patch colorimetry. Hence, this study aims to investigate these conditions by using two experiments. First, we conducted a filtration test on sample oils that were filtered under different conditions, in which we altered the mixing solvent, oil temperature, and incubation period to investigate their influence on membrane patch color. Then, we investigated the behavior of oxidation products versus heating time, incubation period, and oil temperature using an in-situ analysis of a microscopic fourier transform infrared spectroscopy (FT-IR). In the filtration test, the membrane patch color became darker with increasing incubation period. Additionally, the results also indicated that the membrane patch color became brighter when the sample oil and solvent were mixed and/or the oil temperature was high. From the in-situ analysis using the microscopic FT-IR in the case of a heating process, the peak of 1710 cm-1, which is an absorption band of carboxylic acid (-COOH), shifted to a higher wave number. In the case of a holding process, the peak of 1710 cm-1 shifted to a lower wave number. Overall, the results suggest that the oxidation products became low-molecular owing to cleavage of hydrogen bond and easy solubility in turbine oil when the oil temperature was high, and that the oxidation products became high-molecular by hydrogen bonding and difficult to dissolve in turbine oil when the sample oil was cooled and stored. Moreover, from the behavior of the oxidation products at different temperatures in the in-situ analysis, the cleavage of hydrogen bond of oxidation products in turbine oil ended after reaching at least 60–70°C.
format	article
author	Tomohiko Kon Tomomi Honda Akira Sasaki
author_facet	Tomohiko Kon Tomomi Honda Akira Sasaki
author_sort	Tomohiko Kon
title	Influence of Solvents, Oil Temperature, and Incubation Period on Membrane Patch Color
title_short	Influence of Solvents, Oil Temperature, and Incubation Period on Membrane Patch Color
title_full	Influence of Solvents, Oil Temperature, and Incubation Period on Membrane Patch Color
title_fullStr	Influence of Solvents, Oil Temperature, and Incubation Period on Membrane Patch Color
title_full_unstemmed	Influence of Solvents, Oil Temperature, and Incubation Period on Membrane Patch Color
title_sort	influence of solvents, oil temperature, and incubation period on membrane patch color
publisher	Japanese Society of Tribologists
publishDate	2018
url	https://doaj.org/article/6a82d440d639424abcb058c1e48c5974
work_keys_str_mv	AT tomohikokon influenceofsolventsoiltemperatureandincubationperiodonmembranepatchcolor AT tomomihonda influenceofsolventsoiltemperatureandincubationperiodonmembranepatchcolor AT akirasasaki influenceofsolventsoiltemperatureandincubationperiodonmembranepatchcolor
_version_	1718444415045861376

Influence of Solvents, Oil Temperature, and Incubation Period on Membrane Patch Color

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