Kucheryavskiy, Sergey

Maschietti, Marco

Montero, Fernando

English

Application of Raman spectroscopy for monitoring of hydrogen sulfide scavenging reactions using biomass-based chemicals

    Aalborg UniversitetApplication of Raman spectroscopy for monitoring of hydrogen sulfide scavengingreactions using biomass-based chemicalsMontero, Fernando; Kucheryavskiy, Sergey; Maschietti, MarcoCreative Commons LicenseUnspecifiedPublication date:2021Document VersionPublisher's PDF, also known as Version of recordLink to publication from Aalborg UniversityCitation for published version (APA):Montero, F., Kucheryavskiy, S., & Maschietti, M. (2021). Application of Raman spectroscopy for monitoring ofhydrogen sulfide scavenging reactions using biomass-based chemicals. Poster presented at 17th ScandinavianSymposium on Chemometrics (SSC17), Aalborg, Denmark.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            - Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            - You may not further distribute the material or use it for any profit-making activity or commercial gain            - You may freely distribute the URL identifying the publication in the public portal -Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: November 19, 2022NNNOHHOOHSNNHOOHSNSOHI N T R O D U C T I O NAPPLICATION OF RAMAN SPECTROSCOPY FOR MONITORING OF HYDROGEN SULFIDE SCAVENGING REACTIONS USING BIOMASS-BASED CHEMICALSFernando Montero, Sergey Kucheryavskiy, Marco MaschiettiAalborg University, Department of Chemistry and Bioscience, Niels Bohrs Vej 8A, 6700 Esbjerg, DenmarkO B J E C T I V EAssess the feasibility of using Raman spectroscopy for monitoring gas-liquidas well as aqueous phase reactions between H2S and biomass-basedscavengers (BBS) and benchmarking them with MEA-triazine (HET), which isthe most used H2S scavenger.Hydrogen sulfide (H2S) is a toxic and corrosive species which poses serious operating, health, safety and environmental problems to oil and gas production. Injection ofchemicals, called H2S scavengers, in offshore platforms is used to reduce H2S concentration. H2S scavengers, however, ends up in the water discharge into the sea andare associated to a high environmental impact. In recent years, research on the development of novel environmental-friendly H2S scavengers has become relevant.Aqueous phase reactions at 80 °CE X P E R I M E N T STwo types of experiments were carried out:C H A L L E N G E SR E S U LT SS E T U PThe setups allow offline monitoring for gas-liquid and aqueous phasereactions.Scavengers: BBS1, BBS2 and HET: 100 mM, 10 mL, initial pH: 10H2S generation: Na2S•3H2O: 200 mM, 100 mL and HCl: 1M, 50 mLTemperatureof reaction: 80 °CBubbling H2S in scavenger solutions for 5 hoursNaOH solution used to trap H2SOffline monitoring: 2 spectra (3 acc x 5 sec) at beginning and end.Gas-liquid reactionsA C K N O W L E D G E M E N T SC H A R A C T E R I S T I C R A M A N P E A K SGas-liquid reactions at 80 °CScavengers: BBS1, BBS2 and HET: 25 mL, initial pH: 10Initial concentration: 100 mM (Equimolar for scavenger and bisulfide)Temperatures: room and 80 °CInitial pH: 10Offline monitoring: 1 spectrum (3 acc x 5 sec) every 10 min for 1 hourAqueous phase reactionsRaman boxDevelop setups and procedures for quantitative on-line monitoring H2Sscavenging reactions.Acquire kinetic data regarding HET and H2S scavenging reaction to useas benchmark for BBS scavenging reactions.P E R S P E C T I V EFind a suitable internal standard forHET and HS− reactions at 80 °C.Component HS− [1] BBS [2] HET [3] TDZ [3] DTZ [3]Raman shift, cm-1 2574 2260 923 634 675[1] Johansen et al, Chem. Eng. Trans., 74, (2019), 541-546.[2] Socrates, G. Infrared and Raman Characteristics Group Frequencies, third ed., Wiley, 2001.[3] Perez Pineiro et al, Ind. Eng. Chem. Res., 60, (2021), 5394-5402. Bisulfide (HS−)Biomass-based scavenger (BBS)Triazine (HET)Thiadiazine (TDZ) – intermediate HET - H2S by-productDithiazine (DTZ) – final HET - H2S by-productAcetonitrile lack of stability at 80 °C HS− and H2S characteristic peaksGas-liquid reactions at 80 °CAqueous phase reactions at 80 °CThe project “Reaction Kinetics of Green H2S Scavengers”, run incollaboration with Copenhagen University, is financially supported by theDanish Hydrocarbon Research and Technology Centre.Christian Marcus Pedersen and Asger Røikjær Koue, from CopenhagenUniversity, are acknowledged for the synthesis of the biomass-basedscavengers.Changes of H2S characteristicpeak with different pH values.

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Application of Raman spectroscopy for monitoring of hydrogen sulfide scavenging reactions using biomass-based chemicals

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