Raman spectroscopy for monitoring aqueous phase hydrogen sulphide scavenging reactions with triazine: a feasibility study

Leah Nygaard Johansen, Lykke Kloster, Anders Andreasen, Sergey Kucheryavskiy, Rudi P. Nielsen, Marco Maschietti

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Abstract

Triazine is one of the most commonly used scavengers for removal of hydrogen sulphide in the offshore oil and gas industry, but the kinetics of the scavenging reactions are still poorly understood. In this work the feasibility of Raman spectroscopy for on-line monitoring of the aqueous phase reaction between 1,3,5-tri-(2-hydroxyethyl)- hexahydro-s-triazine (HET) and HS - was studied. It was found that the development of specific peaks in the Raman spectra reveals clear patterns related to the changes of concentration of HET and HS- with time. On this basis, a qualitative evaluation of the dependence of the reaction kinetics on temperature and pH was carried out. No change in Raman peaks was observed at 40 °C for reaction time of 30 minutes, but a reaction was observed at 50 °C. Furthermore, a decrease in the reaction rate as the initial pH increases was observed in the pH range 8.5 to 10.3. No change in peaks was observed at pH 10.3 within 30 minutes.

Original languageEnglish
Book seriesChemical engineering transactions
Volume74
Pages (from-to)541-546
ISSN1974-9791
DOIs
Publication statusPublished - 2019

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Triazines
Hydrogen Sulfide
Scavenging
Hydrogen sulfide
Gas industry
Reaction kinetics
Reaction rates
Raman spectroscopy
Raman scattering
Kinetics
Monitoring
Temperature
Oils

Cite this

@article{63d8b9dce1fc4f40b5ef0160e2efc0b0,
title = "Raman spectroscopy for monitoring aqueous phase hydrogen sulphide scavenging reactions with triazine: a feasibility study",
abstract = "Triazine is one of the most commonly used scavengers for removal of hydrogen sulphide in the offshore oil and gas industry, but the kinetics of the scavenging reactions are still poorly understood. In this work the feasibility of Raman spectroscopy for on-line monitoring of the aqueous phase reaction between 1,3,5-tri-(2-hydroxyethyl)- hexahydro-s-triazine (HET) and HS - was studied. It was found that the development of specific peaks in the Raman spectra reveals clear patterns related to the changes of concentration of HET and HS- with time. On this basis, a qualitative evaluation of the dependence of the reaction kinetics on temperature and pH was carried out. No change in Raman peaks was observed at 40 °C for reaction time of 30 minutes, but a reaction was observed at 50 °C. Furthermore, a decrease in the reaction rate as the initial pH increases was observed in the pH range 8.5 to 10.3. No change in peaks was observed at pH 10.3 within 30 minutes.",
author = "Johansen, {Leah Nygaard} and Lykke Kloster and Anders Andreasen and Sergey Kucheryavskiy and Nielsen, {Rudi P.} and Marco Maschietti",
year = "2019",
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language = "English",
volume = "74",
pages = "541--546",
journal = "Chemical engineering transactions",
issn = "1974-9791",
publisher = "AIDIC",

}

Raman spectroscopy for monitoring aqueous phase hydrogen sulphide scavenging reactions with triazine: a feasibility study. / Johansen, Leah Nygaard; Kloster, Lykke ; Andreasen, Anders; Kucheryavskiy, Sergey; Nielsen, Rudi P.; Maschietti, Marco.

In: Chemical engineering transactions, Vol. 74, 2019, p. 541-546.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Raman spectroscopy for monitoring aqueous phase hydrogen sulphide scavenging reactions with triazine: a feasibility study

AU - Johansen, Leah Nygaard

AU - Kloster, Lykke

AU - Andreasen, Anders

AU - Kucheryavskiy, Sergey

AU - Nielsen, Rudi P.

AU - Maschietti, Marco

PY - 2019

Y1 - 2019

N2 - Triazine is one of the most commonly used scavengers for removal of hydrogen sulphide in the offshore oil and gas industry, but the kinetics of the scavenging reactions are still poorly understood. In this work the feasibility of Raman spectroscopy for on-line monitoring of the aqueous phase reaction between 1,3,5-tri-(2-hydroxyethyl)- hexahydro-s-triazine (HET) and HS - was studied. It was found that the development of specific peaks in the Raman spectra reveals clear patterns related to the changes of concentration of HET and HS- with time. On this basis, a qualitative evaluation of the dependence of the reaction kinetics on temperature and pH was carried out. No change in Raman peaks was observed at 40 °C for reaction time of 30 minutes, but a reaction was observed at 50 °C. Furthermore, a decrease in the reaction rate as the initial pH increases was observed in the pH range 8.5 to 10.3. No change in peaks was observed at pH 10.3 within 30 minutes.

AB - Triazine is one of the most commonly used scavengers for removal of hydrogen sulphide in the offshore oil and gas industry, but the kinetics of the scavenging reactions are still poorly understood. In this work the feasibility of Raman spectroscopy for on-line monitoring of the aqueous phase reaction between 1,3,5-tri-(2-hydroxyethyl)- hexahydro-s-triazine (HET) and HS - was studied. It was found that the development of specific peaks in the Raman spectra reveals clear patterns related to the changes of concentration of HET and HS- with time. On this basis, a qualitative evaluation of the dependence of the reaction kinetics on temperature and pH was carried out. No change in Raman peaks was observed at 40 °C for reaction time of 30 minutes, but a reaction was observed at 50 °C. Furthermore, a decrease in the reaction rate as the initial pH increases was observed in the pH range 8.5 to 10.3. No change in peaks was observed at pH 10.3 within 30 minutes.

U2 - 10.3303/CET1974091

DO - 10.3303/CET1974091

M3 - Journal article

VL - 74

SP - 541

EP - 546

JO - Chemical engineering transactions

JF - Chemical engineering transactions

SN - 1974-9791

ER -