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Vol. 9 No. 2 (2018)
Vol 9, Núm. 2 (2018): Vol 9, Núm 2(2018): Julio- Diciembre

Artículos de investigación / Research papers

Purification of the carbon dioxide emitted by gas treatment plants

https://doi.org/10.19053/01217488.v9.n2.2018.7392

Published 2018-07-04

  • Nancy Gámez
    • ,
  • Martha Cobo

Nancy Gámez
Grupo de Energía, Materiales y Ambiente, Facultad de Ingeniería. Universidad de La Sabana. Campus Universitario Puente del Común. Chía, Colombia / Stoc (MASA), Bogotá, Colombia

Martha Cobo
Universidad de La Sabana

Abstract

In natural gas plants, the carbon dioxide (CO2) traveling in the extracted stream is separated and released to the atmosphere. This stream also contains hydrogen sulfide (H2S), water and hydrocarbons. The purpose of this investigation was to design a process to purify this CO2 stream, to its further use in the food industry. There, the CO2 can be employed in carbonated drinks and as supercritical fluid; requiring a purity higher than 99.95 mol%. Therefore, a real flow of 3454 ton/year CO2 was selected as case of study, which is emitted in a gas treatment plant located in Neiva, Colombia. This stream was simulated in ProMax and subjected to chemical absorption with methyl diethanolamine (MDEA), to a dehydration with diethylene glycol combined with molécular sieve, to a Ryan-Holmes cryogenic process for removing light components (methane and ethane) and their combinations. The combination of the three processes allowed us for a 99.95% CO2 recovery and a 99.99 mol% CO2 purity, requiring capital expenses (CAPEX) of USD 412.323 or 53 USD/tCO2. This CO2 could be commercialized at sell prices as high as 5000 USD/tCO2 to the food industry. In addition, the combination of the two first processes delivered a CAPEX of 37 USD/tCO2 with a 99.85 mol% CO2 purity, suitable for other applications requiring less purity in the food industry or improved oil recovery.

Keywords

Global warming; CAPEX; Capital expenses; Carbon capture and utilization (CCU); Process simulation

PDF (Español)

Author Biography

Nancy Gámez

Magíster en Diseño y Gestión de Procesos. Ingeniera de Procesos. Stoc (MASA), Bogotá, Colombia

Martha Cobo

Profesora Asociada

Directora Maestría en Diseño y Gestión de Procesos

Facultad de Ingeniería

Universidad de La Sabana

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