Journal
JOURNAL OF SUPERCRITICAL FLUIDS
Volume 26, Issue 3, Pages 253-261Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0896-8446(02)00163-8
Keywords
supercritical fluids; carbon dioxide; nanoparticles; titanium hydroxide; pilot scale
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Titanium tetra-isopropoxide (TTIP) hydrolysis in supercritical carbon dioxide (SC-CO2) was performed using a continuous pilot plant with an internal volume of 5 dm(3), operated at mild pressure conditions (8-14 MPa) and in the temperature range 40-60 degreesC. Preliminary to reaction experiments, some tests on TTIP solubility in SC-CO2 were performed. TTIP solubility varies from 1.5 to 3.0% (w/w) in the range 40-60 degreesC and for pressures between 10 and 15 MPa. Titanium hydroxide nanospheres with a diameter ranging from about 70 to 110 nm and surface areas larger than 300 m(2) g(-1) were obtained. The influence of the process temperature and pressure on particle morphology, particle size and surface area was studied. (C) 2002 Elsevier Science B.V. All rights reserved.
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