Gasification of black liquor is an attractive alternative to the traditional recovery boiler. However, in process modeling of gasification, thermodynamic data for the key components are quite uncertain, which will reduce the reliability of the modeling of the chemical processes in a gasifier. The objective of this work was to experimentally re-determine and improve data on the binary phase diagram Na 2 CO 3 -Na 2 S, especially on the Na 2 CO 3 side of the system, which is the region of interest concerning black liquor combustion and gasification, and also the region with the most significant uncertainties. Measurements were carried out in a dry inert atmosphere at temperatures from 25 to 1200 °C, using high-temperature microscopy (HTM) and hightemperature X-ray powder diffraction (HT-XRD). To examine the influence of pure CO 2 atmosphere on the melting behavior, HTM experiments in the same temperature interval were made. This paper presents new data complementary to earlier published data on the binary phase diagram Na 2 CO 3 -Na 2 S. These include re-determination of liquidus curves, in the Na 2 CO 3 -rich area, melting points of the pure components, as well as determination of the extent of the solid solution, Na 2 CO 3 (ss), area.
Applied chemistry Z 0300 Sodium and Sulfur Process Chemistry in Black Liquor Gasification and Combustion: Review and Reevaluation of Basic Thermochemical Data -[79 refs.]. -(LARSSON, A.; LINDBERG, G.; RABERG, M.; NORDIN, A.; BOSTROEM, D.; ROSEN, E.; WARNQVIST, B.; BACKMAN, R.; Int. Chem. Recovery Conf.; 11th Int.
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