Conversion of tar in a counter flow of supercritical water at a temperature varying along the reactor axis
- 36 Downloads
The article reports the conversion of tar (empirical formula CH1.47N0.01S0.007) continuously introduced into a counter flow of supercritical water (SCW) at 30 MPa in a tubular reactor with a temperature gradient along its vertical axis (450°C at the top and 650°C at the bottom). The yields of liquid products and volatile (C1–C9) hydrocarbons are 41.4 and 28.4%, respectively, relative to the weight of tar supplied into the reactor. Methane is the major component (40.5 mol %) of the volatile products, and the liquid products are dominated by oils (74.4 wt %). Deasphaltization and desulfurization of tar conversion products are observed. The average rate of water decomposition calculated from the quantity of O atoms in the conversion products is 0.24 g/min. Use of counter flows of the reactants in combination with a temperature gradient along the reactor axis affords a higher yield of low-boiling hydrocarbons than in the case of SCW pumping through a tar layer.
Keywordstar supercritical water desulfurization deasphaltization
Unable to display preview. Download preview PDF.
- 20.Modern Methods of Oil Research, The Reference Book, Ed. by A. I. Bogomolov, M. B. Temyanko, and L. I. Khotyntseva (Nedra, Leningrad, 1984) [in Russian].Google Scholar
- 27.E. W. Lemmon, M. O. McLinden, and D. G. Freid, Thermophysical Properties of Fluid Systems, NIST Chemistry WebBook, NIST Standard Reference Database No. 69, Ed. by P. J. Linstrom and W. G. Mallard (Natl. Inst. Standards Technol., Gaithersburg, MD, 20899). http://webbook.nist.gov/chemistry/fluid/.Google Scholar