Experimental study on CO2 capture by chilled ammonia process

Bak, Chul-U; Asif, Muhammad; Kim, Woo-Seung

doi:10.1016/j.cej.2014.11.145

Cited by 27 publications

(4 citation statements)

References 16 publications

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“…This two-process integration has been designed interposing, between the reaction and purification stages, a salt formation and precipitation section (as in the “wet” ammonium bicarbonate process or in several later options for CO 2 –NH 3 absorption − ) with a main washing tower discharging the oversaturated solution into a decanter. A first centrifuge separates the suspension; then, the ammonia still present is further precipitated blowing into the liquid an additional amount of carbon dioxide and separating through a second centrifuge.…”

Section: Process Descriptionmentioning

confidence: 99%

Acetonitrile from Bioethanol Ammoxidation: Process Design from the Grass-Roots and Life Cycle Analysis

Tripodi

Bahadori

Cespi

et al. 2018

ACS Sustainable Chem. Eng.

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The growing interest for new routes to obtain acetonitrile led to the development of catalysts active toward the ammoxidation of various substrates. Among these, a C2 molecule such as ethanol represents a good choice in terms of atom economy and, being renewable, sets the basis for a long-term sustainable process. This paper describes a fully integrated, newly designed process for the production of acetonitrile from bioethanol, currently not present in the literature. The target is the production and purification of 10 kg/h of acetonitrile, unit of production used for calculations, obtained from ethanol, ammonia, and air as raw materials. All the byproducts, mainly ammonium bicarbonate and sodium cyanide, are considered marketable chemicals and represent an added value, instead of a disposal issue. Their optimized recovery is included in this flowsheet as a basis for the future economic assessment of the system. The process consumes CO 2 without its direct emission. In principle, all the carbon atoms and 90% of the nitrogen atoms are turned into reaction products, and the main loss is gaseous N 2 . The process design has been performed by means of the Aspen PLUS process simulator, on the basis of literature data and other experimental results. In addition, for an evaluation of the potential benefits of the innovative biobased route, a life cycle analysis was carried out including all the stages involved in the bioacetonitrile production (from raw materials extraction up to the gate plant). The results were then compared with those achieved for the traditional fossil route (SOHIO process), showing a sensible decrease of the environmental burdens in terms of nonrenewable resources and damage to ecosystems (e.g., toxicity, climate change, etc.). Finally, a simplified sensitivity analysis was carried out by substituting the starting raw material for the production of bioethanol (corn) with other materials conventionally used worldwide, such as sugar cane and wood. The latter option seems to make the system more competitive in terms of carbon neutrality, thanks to the usage of the residual lignocellulosic fraction available on the market.

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Section: Process Descriptionmentioning

confidence: 99%

Acetonitrile from Bioethanol Ammoxidation: Process Design from the Grass-Roots and Life Cycle Analysis

Tripodi

Bahadori

Cespi

et al. 2018

ACS Sustainable Chem. Eng.

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“…The first variant, known as the chilled ammonia process (CAP), developed by ALSTOM, absorbs CO 2 at a low temperature in the range of (2–10°C). The low temperature minimizes the ammonia slip from the absorber, but facilitates the formation of a solid ammonium carbonate compound . The CAP was tested in a pilot plant at Wisconsin, USA, in 2008 for 15 000 tonne of CO 2 captured per year.…”

Section: Post Combustion Capture (Pcc) For Co2mentioning

confidence: 99%

Post‐combustion CO₂ capture with chemical absorption and hybrid system: current status and challenges

et al. 2018

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Post-combustion CO 2 capture from the power and industrial sectors has gained widespread attention due to its ability to retrofit easily with newly installed and existing plants. This state-of-the-art, updated review provides an overview of technical issues in post-combustion CO 2 capture related to process performance, energy requirements for CO 2 capture, and inconsistencies in the prediction of CO 2 capture cost. Recent updates are presented regarding chemical absorption-desorption systems, and particularly CO 2 absorption and solubility enhancement studies, absorber operation at elevated pressure, recent developments in absorber configuration, and methods for reducing the heat duty of strippers. Furthermore, recently developed post-combustion hybrid techniques such as the membrane-absorbent hybrid process, the membrane-cryogenic hybrid process, the membrane-adsorption hybrid process, the absorption-electrolysis hybrid process, and the solar thermal electrochemical process (STEP) are discussed. Finally, we suggest areas for improvement and indicate that there are significant future prospects for post-combustion CO 2 capture. C

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“…Most studies regarding this salt, on the other hand, investigate more generally the thermodynamics of the NH 3 –CO 2 –water mixture, − showing that ammonium bicarbonate is the predominant solid species when the stoichiometric ratio between N and C is 1:1. , This system is of interest when ammonia is used as a CO 2 -capturing agent − or when the salt itself is produced and marketed as a fertilizer alternative to urea. , …”

Section: Introductionmentioning

confidence: 99%

Solid–Liquid–Liquid Equilibria of the System Water, Acetonitrile, and Ammonium Bicarbonate in Multiphase Reacting Systems

Tripodi

Conte

Robbiano

et al. 2021

Ind. Eng. Chem. Res.

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The salting out of acetonitrile from water in the presence of ammonium bicarbonate was studied at atmospheric pressure from 4 to 35 °C. The coexisting phases were analyzed independently with H1 nuclear magnetic resonance, ion chromatography, calorimetry, and titrations. The binodal region was described with semiempirical functions and with the UNIQUAC thermodynamic model. The critical composition at ambient temperature is given by 0.02 g/g of salt and 0.58 g/g of acetonitrile: at lower salt concentrations; this mixture is widely employed in liquid chromatography, thanks to the buffering properties of the bicarbonate. The separation of acetonitrile and water for extraction purposes, instead, is often obtained with other ammonium salts. These ternary equilibrium data can then be useful to develop extraction and analysis procedures at buffered, mildly alkaline pH. In addition, this mixture can be encountered during the acetonitrile synthesis proposed from bioethanol and bioethylene, so these multiphase equilibria govern the separation and purification of acetonitrile in specific reactors that allow the recovery of ammonium bicarbonate as a valuable byproduct. Furthermore, the solubility of this salt in alcohols and its decomposition were investigated to target its stability in multiphase reactors, extractors, and driers.

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Experimental study on CO2 capture by chilled ammonia process

Cited by 27 publications

References 16 publications

Acetonitrile from Bioethanol Ammoxidation: Process Design from the Grass-Roots and Life Cycle Analysis

Acetonitrile from Bioethanol Ammoxidation: Process Design from the Grass-Roots and Life Cycle Analysis

Post‐combustion CO₂ capture with chemical absorption and hybrid system: current status and challenges

Solid–Liquid–Liquid Equilibria of the System Water, Acetonitrile, and Ammonium Bicarbonate in Multiphase Reacting Systems

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Experimental study on CO2 capture by chilled ammonia process

Cited by 27 publications

References 16 publications

Acetonitrile from Bioethanol Ammoxidation: Process Design from the Grass-Roots and Life Cycle Analysis

Acetonitrile from Bioethanol Ammoxidation: Process Design from the Grass-Roots and Life Cycle Analysis

Post‐combustion CO2 capture with chemical absorption and hybrid system: current status and challenges

Solid–Liquid–Liquid Equilibria of the System Water, Acetonitrile, and Ammonium Bicarbonate in Multiphase Reacting Systems

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Post‐combustion CO₂ capture with chemical absorption and hybrid system: current status and challenges