Kinetics of carbonyl sulfide reaction with alkanolamines: A review

Vaidya, Prakash D.; Kenig, Eugeny Y.

doi:10.1016/j.cej.2008.08.009

Cited by 29 publications

(23 citation statements)

References 29 publications

(59 reference statements)

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“…From the data in Figure 3, we observed that 80% of the maximal amount of ion pairs had formed within approximately 90 min on reactions with COS. COS reacted slower than CO 2 with propylamine-modified silica, which was consistent with the findings for aqueous amines. 14,16,17,19,20 A detailed analysis of the time-dependent IR spectra of the chemisorbed COS on the DAH sample revealed a small contribution from a slowly forming chemisorbed moiety. Most of the propylammonium propylthiocarbamate ion pairs had formed after 130 min, but slower reactions contributed to further spectral changes on the chemisorption of COS. At 240 min, a clear band had developed in the time-dependent IR spectra of Figure 3 at a frequency of 1655 cm −1 and a less pronounced one at 1536 cm −1 .…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Adsorption of Carbonyl Sulfide on Propylamine Tethered to Porous Silica

Bacsik

Hedin

2018

Langmuir

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Carbonyl sulfide (COS) reacts slowly with amines in the aqueous solutions used to absorb CO from natural gas and flue gas and can also deactivate certain aqueous amines. The effects of COS on amines tethered to porous silica, however, have not been investigated before. Hence, the adsorption of COS on aminopropyl groups tethered to porous silica was studied using in situ IR spectroscopy. COS chemisorbed mainly and reversibly as propylammonium propylthiocarbamate ion pairs [R-NH(C═O)SHN-R] under dry conditions. In addition, a small amount of another chemisorbed species formed slowly and irreversibly. Nevertheless, the CO capacities of the adsorbents were fully retained after COS was desorbed.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Adsorption of Carbonyl Sulfide on Propylamine Tethered to Porous Silica

Bacsik

Hedin

2018

Langmuir

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“…Carbonyl sulfide (COS) is one of the primary forms of organic sulfur [1] . It causes corrosion problems and catalyst poisoning in the chemical industry, moreover, it pollutes the environment and endangers human health [2–3] . Therefore, removing COS from industrial waste gas seems rather crucial.…”

Section: Introductionmentioning

confidence: 99%

Research on the Catalytic Hydrolysis of COS by Fe−Cu/AC Catalyst and Its Inactivation Mechanism at Low Temperature**

Han

Zhang

2022

ChemistrySelect

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For removing carbonyl sulfide (COS) from industrial waste gas at low temperatures, the critical approach is to prepare an efficient and cheap catalyst. In this paper, Fe/Cu modified coal‐based activated carbon (AC) was prepared by co‐precipitation method and tested for the catalytic hydrolysis of carbonyl sulfide (COS) at low temperatures in a fixed‐bed reactor. The results showed that the best mole ratio of Fe/Cu was 1 : 1 and the best content of metal oxides was 50 %. BET, XRD, XPS, FTIR, and SEM investigated the structure and surface properties. COS was hydrolyzed on Fe2O3 to produce H2S and CO2, and H2S reacted with CuO to have CuS. At the same time, H2S reacted with Fe2O3 to produce FeS and elementary sulfur. Oxidized elemental sulfur was to form sulfuric acid, which responded with Fe2O3 to form sulfates. The sulfates would be deposited on the catalysts’ surface and block the pore structure. Deactivation of metal oxides and blockage of pore structures were the main reason for catalyst deactivation.

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“…In carbon steels, this flow rate is limited to about 0.92 to 1.82 m/s in a rich amine solution and 6.09 m/s in a poor amine solution. Various gaseous flows of chemical processes discharged into the atmosphere or used as fuels must be cleaned beforehand, to remove contaminants such as carbon dioxide, hydrogen sulfide and carbonyl sulfide, the removal of these acid gases is extremely necessary in the oil refining industry, which can cause damage to equipment due to corrosion [16]. Besides that, the degradation of the DEA and the formation of heat-stable salts (HSS) lead to severe corrosion problems [11].…”

Section: Introductionmentioning

confidence: 99%

Failure analysis in heat exchanger tubes from the top system of the regeneration tower of the hydrotreatment unit in an oil refinery: a case study

2021

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This paper presents a failure analysis performed on tubes of a heat exchanger. Heat exchangers are among the most common equipment in an oil refining industry, as heat transfer is one of the most important and common processes in chemical and petrochemical industries. The equipment analyzed was the condenser of the top system of the diethanolamine regeneration tower of the naphtha hydrotreating unit of an oil refinery. The tubular bundle consists of 78 tubes in the ASTM A213 Grade 316L specification, with 19.05 mm in diameter and 1.65 mm in wall thickness. The tubes are subjected to the aqueous flow of H2S and diethanolamine on the outside and cooling water on the inside. After a scheduled general shutdown in July 2011, after six years of continuous operation, the loss of thickness in several tubes was observed. The result of the failure analysis indicated that, through visual inspection, the corrosive process occurred from outside to inside the tubes. The eddy current test indicated an active corrosive process with a corrosion rate of 0.16775 mm / year. The ultrasonic inspection performed through the internal rotating inspection system (IRIS) confirmed the loss of thickness and the presence of perforated tubes, with consequent loss of containment. Amine corrosion in the presence of H2S was identified as the basic failure mechanism, aggravated by DEA concentration higher than 20 wt.% in the analyzed equipment. In October 2019, the tubes of this exchanger were replaced and the proposed solution to mitigate the problem was to dilute the solution with washing water, to obtain amine solution concentrations below 5% by mass in the beam tubes of the heat exchanger.

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Kinetics of carbonyl sulfide reaction with alkanolamines: A review

Cited by 29 publications

References 29 publications

Adsorption of Carbonyl Sulfide on Propylamine Tethered to Porous Silica

Adsorption of Carbonyl Sulfide on Propylamine Tethered to Porous Silica

Research on the Catalytic Hydrolysis of COS by Fe−Cu/AC Catalyst and Its Inactivation Mechanism at Low Temperature**

Failure analysis in heat exchanger tubes from the top system of the regeneration tower of the hydrotreatment unit in an oil refinery: a case study

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