Absorption of carbonyl sulfide in aqueous methyldiethanolamine

Al-Ghawas, Hani A.; Ruiz-Ibanez, Gabriel; Sandall, Orville C.

doi:10.1016/0009-2509(89)85039-0

Cited by 49 publications

(73 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These experiments appear to confirm the kinetic data reported by Al-Ghawas et al (1989), although it should be noted that the sensitivity of the experiments toward the reaction kinetics for COS was not very strong.…”

Section: Literaturesupporting

confidence: 88%

“…They observed a first-order behavior of the overall reaction rate in both COS and amine concentrations. On the basis of these observations they proposed the following reaction mechanism for the reaction between COS and tertiary amines: This mechanism can be regarded as the base-catalyzed version of the first step of the reaction mechanism p r e posed by Philipp and Dautzenberg (1965) for the hydrolysis of COS. Al-Ghawas et al (1989) observed no evidence for the occurrence of the s a n d step of this hydrolysis mechanism (reaction 2).…”

Section: Literaturementioning

confidence: 88%

“…The absorption experiments were interpreted by means of a numerically solved absorption model and were found to be in reasonable agreement with the kinetic experiments presented in this article. The absorption model was subsequently applied to investigate the discrepancies between the present work and the work of Al-Ghawas et al (1989).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Kinetic study of COS with tertiary alkanolamine solutions. 1. Experiments in an intensely stirred batch reactor

Littel¹,

Versteeg²,

Swaaij³

1992

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

proached and exceeded by conducting DPO at conventional pressures (-6 MPa) but at unusually high temperatures (530-730 vs 450 "C). Also important according to the model was short reaction time (on the order of tens to hundreds of milliseconds) to prevent combustion.The model predictions for conditions roughly corresponding to our experiments (550 "C, 6.2 MPa, 13-15% O2 in the feed, and 13-15% CHI conversion) indicated that -4 5 4 % CHBOH selectivity might be expected (assuming that our estimated residence times-as low as -1500 ms-were sufficiently short). The dominance of Cz+ in the present study's results suggest that further testing of the model's predictions in other experimental configurations (e.g., empty tubes with very low surface/volume ratios) would be desirable to determine if its chemical basis requires modification. ConclusionsAt elevated pressure (6.2 MPa), significant amounts of Cz+ oxidative coupling products could be obtained without a catalyst (-35% carbon selectivity at -15% methane conversion) at temperatures much lower than those of conventional catalytic operation (550-600 vs 75O-WO "C). However, the observed selectivity behavior is typical of much of the conventional catalytic low-pressure, hightemperature data at similar conversion. This observation, coupled with a modest influence on selectivity by samarium oxide catalyst when run at the same atypical conditions, supports the view that noncatalytic gas-phase radical reactions play a strong role in conventional oxidative coupling.At the elevated pressure and moderate temperatures investigated, the direct conversion of CHI to CHBOH and Cz+ appears to depend upon the relative contributions of two parallel pathways: increasing oxygen partial pressure and/or temperatures favors the Cz+ path while reducing these parameters favors CH30H production. The reaction between COS and various tertiary alkanolamines in aqueous solutions has been studied in an intensely stirred batch reactor. Experiments for TEA, DMMEA, and DEMEA were carried out at 303 K the reaction between COS and aqueous MDEA has been studied at temperaturm ranging from 293 to 323 K. A two-step reaction mechanism haa been proposed which describes all observed phenomena. This mechanism can be regarded as the base-catalyzed analogue of the reaction mechanism for the hydrolysis of COS. The proposed reaction mechanism was confirmed by absorption experiments into nonaqueous solutions of tertiary alkanolamines.

show abstract

Section: Literaturesupporting

confidence: 88%

Section: Literaturementioning

confidence: 88%

See 1 more Smart Citation

Kinetic study of COS with tertiary alkanolamine solutions. 1. Experiments in an intensely stirred batch reactor

Littel¹,

Versteeg²,

Swaaij³

1992

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Thermodynamic parameter T Temperature (K) b 7 Water adsorption coefficient in reaction 7 (bar À1 ) s Tortuosity…”

Section: A Pmentioning

confidence: 99%

“…Al-Ghawas et al [7] proposed that tertiary amines act as base catalyst for the hydrolysis reaction of COS according to Reaction 4:…”

Section: Existing Sweetening Processes: Advantages and Disadvantagesmentioning

confidence: 99%

COSWEET^TM: A New Process to Reach Very High COS Specification on Natural Gas Treatment Combined with Selective H₂S Removal

Magné-Drisch

Gazarian

Gonnard

et al. 2016

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

-COSWEET TM , developed for the treatment of COS containing natural gases, is based on a combination of deacidification with any alkanolamine solution and COS hydrolysis on a metal oxide based catalyst. Nearly complete COS conversion is reached, even at a relatively low operating temperature. Coupled with a classical sweetening unit, in which an adapted alkanolamine solvent is used in order to optimise the removal of H 2 S, CO 2 , as well as the H 2 S/CO 2 selectivity, the high catalyst activity and the original integration of the scheme secure the COS removal at minimum extra cost. Benefits on capital and operating expenditures of the plant result both from the reduction of the absorption column and solvent flow rate and from the quality of the acid gas which has positive consequences on the design of the sulfur recovery facilities units, including Claus unit. This paper presents the complete development process approach and the results obtained on COS conversion, the model and simulation tool as well as a case study showing the advantages of coupling COSWEET TM to amine based solvent.Résumé -COSWEET TM : procédé innovant de traitement du gaz naturel combinant une élimination sélective de l'H 2 S et une spécification poussée sur le COS -COSWEET TM , procédé développé pour le traitement du gaz naturel comportant du COS, est une intégration entre un procédé de désacidification à base d'une solution d'alcanolamine et une section catalytique assurant l'hydrolyse du COS à l'aide d'un catalyseur à base d'oxyde métallique. Ce procédé permet d'atteindre des conversions du COS proches de 100 % à basses températures. Lorsque la section catalytique est couplée à une section de désacidification mettant en oeuvre un solvant à base d'une alcanolamine adaptée de telle manière à optimiser l'élimination de l'H 2 S et du CO 2 et également la sélectivité H 2 S/CO 2 , la forte activité du catalyseur et l'intégration originale des deux sections permettent de garantir une spécification sur le COS tout en minimisant les coûts de traitement. Les gains sur les coûts d'investissements et opératoires sont dus non seulement à la réduction de la taille de l'absorbeur et du débit de solvant mais également à la qualité du gaz acide, qui impacte la chaîne soufre en aval, comprenant l'unité Claus.

show abstract

Chemistry in Acid Gas Treating

Eimer

2014

Gas Treating

View full text Add to dashboard Cite

Absorption of carbonyl sulfide in aqueous methyldiethanolamine

Cited by 49 publications

References 20 publications

Kinetic study of COS with tertiary alkanolamine solutions. 1. Experiments in an intensely stirred batch reactor

Kinetic study of COS with tertiary alkanolamine solutions. 1. Experiments in an intensely stirred batch reactor

COSWEET^TM: A New Process to Reach Very High COS Specification on Natural Gas Treatment Combined with Selective H₂S Removal

Chemistry in Acid Gas Treating

Contact Info

Product

Resources

About

Absorption of carbonyl sulfide in aqueous methyldiethanolamine

Cited by 49 publications

References 20 publications

Kinetic study of COS with tertiary alkanolamine solutions. 1. Experiments in an intensely stirred batch reactor

Kinetic study of COS with tertiary alkanolamine solutions. 1. Experiments in an intensely stirred batch reactor

COSWEETTM: A New Process to Reach Very High COS Specification on Natural Gas Treatment Combined with Selective H2S Removal

Chemistry in Acid Gas Treating

Contact Info

Product

Resources

About

COSWEET^TM: A New Process to Reach Very High COS Specification on Natural Gas Treatment Combined with Selective H₂S Removal