Processes of Multi-production Products and Utilities

Anita Kovač Kralj


Abstract: Process production of the different products should be more economical. The fact is we target that more products are being produced from raw materials. The basic primary goal is multi-production product processes, and the secondary goal is to save raw materials. During an oil crisis, the price of natural gas is too high, therefore the amount of natural gas could be reduced by 30 % by using cheaper raw materials or waste material. This paper aims at replacing natural gas by 30 % during the methanol process using CO2, which is separated from flue gas by using a pressure swing adsorption (PSA) column. The existing methanol production process can be enlarged by simultaneous structuring, such as selecting the optimal mass flow of both products (methanol and hydrogen), and the heat flow rate of steam production, using an NLP (nonlinear programming) model. Optimal methanol and hydrogen conversion can take place during this operation, by applying optimal parametric data within a reformer unit (temperature = 840oC and pressure = 8 bar), using 71% natural gas and 29% pure CO2 separated from flue gas.
Key words: Methanol production; Hydrogen production; Flue gas, CO2 separation; Mathematical model; Nonlinear programming


Methanol production; Hydrogen production; Flue gas, CO2 separation; Mathematical model; Nonlinear programming

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Luis, F. H. Ayala, Alp D., & Al-Timimy, M. (2009). Intelligent design and selection of natural gas two-phase separators. Journal of Natural Gas Science and Engineering, 1 (3), 84-94.

Barros Zárante P. H, & Ricardo Sodré J. (2009). Evaluating carbon emissions reduction by use of natural gas as engine fuel. Journal of Natural Gas Science and Engineering, 1 (6), 216-220.

Carbo, P., & Migliardini, F. (2009). Natural gas and biofuel as feedstock for hydrogen production on Ni catalysts. Journal of Natural Gas Chemistry 18 (1), 9-19.

McKetta, J. J., & Cunningham, W.A. (1985). Encyclopaedia of chemical processing and design (v.29, pp. 418-474). New York: Marcel Dekker.

Aspen Technology (2002). ASPEN PLUS User Manual Release 11.1, Aspen Technology Inc., Cambridge, MA 02139, USA.

Kovač Kralj A., Glavič, P., & Kravanja, Z. (2000). Retrofit of complex and energy intensive processes II: stepwise simultaneous superstructural approach. Comput. chem. Engng 24 (1), 125-138.

Kovač Kralj A., & Glavič P. (2007). H2 separation and use in fuel cells and CO2 separation and reuse as a reactant in the existing methanol process. Energy fuels 21 (5), 2892-2899.

Biegler L. T., Grossmann I. E., & Westerberg A. W. (1997). Systematic methods of chemical process design, Prentice Hall (pp.1-408). New Jersey: Upper Saddle River.

Brooke A., Kendrick D., & Meeraus A. (1992). GAMS: a user’s guide. Palo Alto: Scientific Press.




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