Simulation and techno-economic optimization of the supercritical CO2 extraction of Eucalyptus globulus bark at industrial scale

resumo

This work addresses economic and process aspects of the supercritical fluid extraction (SFE) of Eucalyptus globulus bark at industrial scale. Broken plus intact cells (BIC) model was applied to existing data and new SFE curves were simulated. Then, statistical optimization was performed with Response Surface Methodology (RSM) involving of 5 factors (pressure, temperature, cosolvent content, solvent flow rate and extraction time), and four responses: Total Yield (eta(Total)), Productivity, Cost of Manufacturing (COM) and Process Energy. The design and simulation of the industrial process (Aspen Plus (R) software) was performed including the employment of co-solvent in the system. The best COM scored 28.1 sic kg(extract)(-1), where eta(Total) was 0.84-0.96 wt.%, Productivity reached 311-362 ton(extract)year(-1), and Process Energy scored 1.46-2.10 GJ kg(extract)(-1). These results underline that SFE provides an extended margin for trade-offs, and arguments towards the integration of SFE technology to biorefine the bark of E. globulus in pulp mills.

palavras-chave

RESPONSE-SURFACE METHODOLOGY; FLUID EXTRACTION; TRITERPENIC ACIDS; OPERATING-CONDITIONS; PHENOLIC-COMPOUNDS; ENERGY EVALUATION; RESIDUES; CURVES; LABILL; YIELDS

categoria

Chemistry; Engineering

autores

Rodrigues, VH; de Melo, MMR; Portugal, I; Silva, CM

nossos autores

agradecimentos

This work was developed in the scope of: (i) project CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement; and (ii) Project Inpactus - innovative products and technologies from eucalyptus, Project No 21,874 funded by Portugal 2020 through European Regional Development Fund (ERDF) in the frame of COMPETE 2020 no246/AXIS II/2017.

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