The E-S-T Method Based on the Grand Composite Curve Links Energy Consumption with Number of Stages and Stage Temperatures for Binary Mixture Distillation

Autor(es)

Bonhivers, Jean-Christophe ^[1] ; Maciel, Maria Regina Wolf ^[1] ; Reddick, Christopher ^[2] ; Zemp, Roger ^[1] ; Mariano, Adriano Pinto ^[1] ; Filho Maciel, Rubens ^[1]

Afiliação do(s) autor(es)

^[1] Univ Campinas UNICAMP, Sch Chem Engn, Campinas, SP - Brazil

^[2] Univ Sherbrooke, Sherbrooke, PQ - Canada

• Tipo de documento: Artigo Científico
• Fonte: PROCESS INTEGRATION AND OPTIMIZATION FOR SUSTAINABILITY; AUG 2021.
• Citações Web of Science: 0

Resumo

Increasing the energy efficiency in industrial processes leads to positive effects for society, such as reduced production costs and improved sustainability. Pinch analysis, which is the most currently used approach to process integration, already includes the column grand composite curve (CGCC) for evaluating the minimum energy consumption in distillation columns. However, the CGCC assumes an infinite number of stages and does not provide any information on the number of stages necessary to achieve a specific energy-saving objective. This paper presents the energy-stage-temperature (E-S-T) method and associated E-S-T diagram for linking energy consumption and stage identification. The CGCC and stage temperatures provided by a single simulation of a distillation column allow drawing the E-S-T diagram to evaluate the number of stages resulting from an energy-saving modification, or the addition of side reboilers or condensers. Analysis results for columns fed by benzene-toluene, ethanol-methanol, and ethanol-water, with one and two reboilers or condensers, are presented. The method identifies the column stages of a column fed by binary mixtures, with any number of reboilers and condensers. Results from the E-S-T method are more accurate than those provided by the Gilliland correlation which is the most widely used empirical approach for evaluating the number of stages. This paper also puts forward insight into the heat cascade through stages and the corresponding exergy change, and proposes two new approaches for evaluating the CGCC. The E-S-T method can be considered the energy-based approach corresponding to the composition-based McCabe-Thiele method, and helps improve energy efficiency by including distillation columns used in industrial processes within the pinch analysis framework. (AU)

• Processo FAPESP: 15/20630-4 - Desenvolvimento integrado de biorrefinaria e planta de bioetanol de cana-de-açúcar com emissão zero de CO2: rotas para converter recursos renováveis em bioprodutos e bioeletricidade
• Beneficiário: Rubens Maciel Filho
• Modalidade de apoio: Auxílio à Pesquisa - Temático
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• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado