Carbon dioxide desorption from aqueous solutions of monoethanolamine and diethanolamine in a microchannel reactor

Aghel, Babak; Sahraie, Sasan; Heidaryan, Ehsan

doi:10.1016/j.seppur.2019.116390

Cited by 42 publications

(21 citation statements)

References 43 publications

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“…Apart from introducing gas into the microreactor system, the gas phase can be present as products of chemical reactions, such as oxidation, 24–26 decomposition 27 and desorption 28–30 . Shang et al 25 developed a continuous‐flow microreactor system to directly synthesize adipic acid from cyclohexene using H 2 O 2 as the oxidation under high temperature and pressure.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics study of a fast liquid–liquid oxidation process with in situ gas production in microreactors

Liu

Shang

et al. 2021

AIChE Journal

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Hydrodynamics characteristics of a fast and highly exothermic liquid–liquid oxidation process with in situ gas production in microreactors were studied using a newly developed experimental method. In the adipic acid synthesis through the K/A oil (the mixture of cyclohexanol and cyclohexanone) oxidation with nitric acid, bubble generation modes were divided into four categories. The gas production became more intensive, unstable, even explosive with increasing the oil phase feed rate and the temperature. A novel automatic image processing method was developed to monitor the instantaneous velocity online by tracking the gas–liquid interface. The axial velocity at the same location was unstable due to the changing gas production rate. Furthermore, the actual residence time was obtained easily with being only 36% of the space–time minimally, beneficial for establishing accurate kinetics and mass transfer models with time participation. Finally, an empirical correlation was developed to predict the actual residence time under different conditions.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamics study of a fast liquid–liquid oxidation process with in situ gas production in microreactors

Liu

Shang

et al. 2021

AIChE Journal

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“…The selection of an extremely effective chemical solvent that can meet beneficial requirements such as a high absorption capacity, high chemical and thermal stability, rapid reaction kinetics, and large regeneration energy savings is one of the most pivotal factors in chemical absorption [ 6 ]. Aqueous solvents of alkanolamine such as diethanolamine (DEA) and methyl DEA (MDEA) have been used as industrial chemical absorbents in scrubber units [ 10 ], but these amine solvents require large amounts of energy for their regeneration [ 11 ]. Aqueous solutions of MDEA and DEA are widely used in industrial treatment, especially for acid gas streams containing H 2 S and CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Exergy study of amine regeneration unit using diethanolamine in a refinery plant: A real start-up plant

Ibrahim

Ashour

Gadalla

2021

Heliyon

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Refinery plants use diethanolamine (DEA) solutions for gas sweetening. The role of DEA is to absorb H 2 S from sour gas. Amine Regeneration Units (ARU) are used to regenerate the rich Amine with H 2 S from refinery units to Lean Amine. An ARU unit of a Middle Eastern refinery that began official production in 2020 was simulated using Aspen HYSYS V.11, and an exergy study was conducted on different equipment. Whereas energy is transformed from one form to another, the exergy is destroyed in an irreversible process. The total exergy was equal to the physical and chemical exergy. The physical exergy was calculated using HYSYS, and the chemical exergy was calculated using a series of equations embedded in Excel. The DEA concentration used was 25 wt%. The exergy destruction rates, destruction efficiency, and percentage share of destruction of each piece of equipment were calculated. The regenerator exhibited the highest destruction rate of 13459.73 kW, and a percentage share of 79.61% of the total destruction. The overall exergy efficiency was 99.7%. The DEA concentration decreased from 25% to 20% as a result of system losses during start-up. Therefore, a case study was conducted to test the effect of this decrease in the H 2 S concentration in the sweet gas, and no effect was observed. An exergy study was conducted using an DEA of 20%. The distribution of the equipment destruction did not change. The total destruction loss increased by 2057.08 kW. From the exergy and operation point of view, the best scenario was to use a 25% concentration, to prevent destruction losses and operation problems.

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“…Monoethanolamine is the most widely used amine, but it is currently being replaced by diethanolamine, with greater regenerative power and low cost, which allows gains in performance and initial absorption [7,8]. There are reports that indicate the use of amine mixtures for specific applications [9]. Generally, such processes for removing contaminants by amines occur at room pressures and temperatures [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…There are reports that indicate the use of amine mixtures for specific applications [9]. Generally, such processes for removing contaminants by amines occur at room pressures and temperatures [7][8][9]. The peak of the absorption by the amines occurs around 20 wt.…”

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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Carbon dioxide desorption from aqueous solutions of monoethanolamine and diethanolamine in a microchannel reactor

Cited by 42 publications

References 43 publications

Hydrodynamics study of a fast liquid–liquid oxidation process with in situ gas production in microreactors

Hydrodynamics study of a fast liquid–liquid oxidation process with in situ gas production in microreactors

Exergy study of amine regeneration unit using diethanolamine in a refinery plant: A real start-up plant

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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