The side reactions in the esterification of phthalic anhydride with 2-ethylhexane-1-ol in the presence of organotitanates

1984 ◽  
Vol 49 (1) ◽  
pp. 253-266 ◽  
Author(s):  
Jan Novrocík ◽  
Marta Novrocíková ◽  
Jiří Norek ◽  
Ivan Koruna ◽  
Miroslav Ryska
Keyword(s):  
Titanium Dioxide ◽  
Quantitative Determination ◽  
Homogeneous Catalysis ◽  
Phthalic Anhydride ◽  
Spectral Methods ◽  
Side Reactions ◽  
Hydrated Titanium Dioxide ◽  
Ethylhexyl Phthalate ◽  
Hydrated Titanium

Using synthetic, chromatographic and spectral methods, we studied the side reactions accompanying the preparation of di-2-ethylhexyl phthalate from phthalic anhydride and 2-ethyl-hexane-1-ol in the presence of catalytic amounts of tetra-n-butyl titanate.The catalyst proper was titanium(IV) mono-2-ethylhexyl phthalate. The possibility of a simultaneous gas-chromatographic quantitative determination of mono-2-ethylhexyl phthalate, di-2-ethylhexyl phthalate, 2-ethylhexane-1-ol and tetra-n-butyl titanate, reported in the literature, has been refuted. In the esterification catalysed by hydrated titanium dioxide homogeneous catalysis by the formed organotitanate was dominating. The dissolving of hydrated titanium dioxide in the esterification of phthalic anhydride with 2-ethylhexane-1-ol was studied polarographically.

Hydrolysis of titanium sulphate compounds

2008 ◽  
Vol 62 (1) ◽  
Author(s):  
Barbara Grzmil ◽  
Daniel Grela ◽  
Bogumił Kic
Keyword(s):  
Titanium Dioxide ◽  
Sulphuric Acid ◽  
Final Stage ◽  
Degree Of Hydrolysis ◽  
Commercial Preparation ◽  
Hydrated Titanium Dioxide ◽  
Starting Solution ◽  
Titanyl Sulphate ◽  
Hydrolysis Of ◽  
Hydrated Titanium

AbstractThe influence of TiOSO4 and free sulphuric acid concentrations in the starting solution on the degree of titanyl sulphate conversion to hydrated titanium dioxide and post-hydrolytic sulphuric acid was studied. Titanyl sulphate solution, an intermediate product in the commercial preparation of titanium dioxide pigments by sulphate route, was used. It was found that the degree of hydrolysis markedly depends on the studied parameters. The lower was the content of TiOSO4 in the starting solution, the higher conversion was achieved. The degree of hydrolysis at the final stage varied between 81 % (420 g TiOSO4 dm−3, 216 g H2SO4 dm−3) and 92 % (300 g TiOSO4 dm−3, 216 g H2SO4 dm−3). The same relation was obtained when changing the concentration of free H2SO4 in the starting solution. The degree of hydrolysis at the final stage varied between 49 % (261 g H2SO4 dm−3, 340 g TiOSO4 dm−3) and 96 % (136 g H2SO4 dm−3, 340 g TiOSO4 dm−3). The particle size of the obtained hydrated titanium dioxide (HTD) also depends on the initial solution composition.

Quantitative determination of titanium dioxide in cellulose acetate spinning solutions

1990 ◽  
Vol 21 (6) ◽  
pp. 516-517
Author(s):  
G. E. Konovalova ◽  
S. Z. Rosina ◽  
R. A. Muminova ◽  
Yu. T. Tashpulatov
Keyword(s):  
Titanium Dioxide ◽  
Quantitative Determination ◽  
Cellulose Acetate

Photocatalytic lithography based on thin films of amorphous hydrated titanium dioxide

2008 ◽  
Vol 42 (2) ◽  
pp. 127-131 ◽  
Author(s):  
E. V. Skorb ◽  
V. G. Sokolov ◽  
T. V. Byk ◽  
T. V. Gaevskaya ◽  
D. V. Sviridov ◽  
...  
Keyword(s):  
Thin Films ◽  
Titanium Dioxide ◽  
Hydrated Titanium Dioxide ◽  
Hydrated Titanium

Formation of hydrated titanium dioxide from seeded titanyl sulphate solution

2009 ◽  
Vol 63 (2) ◽  
Author(s):  
Barbara Grzmil ◽  
Daniel Grela ◽  
Bogumił Kic
Keyword(s):  
Titanium Dioxide ◽  
Conversion Degree ◽  
Degree Of Hydrolysis ◽  
Hydrated Titanium Dioxide ◽  
Hydrolysis Process ◽  
Lower Temperature ◽  
Titanyl Sulphate ◽  
Titanium White ◽  
Final Degree ◽  
Hydrated Titanium

AbstractThe paper analyses the influence of various kinds and amounts of titanium dioxide nuclei addition to a solution of titanyl sulphate on the conversion degree of TiOSO4 to hydrated titanium dioxide and sulphuric acid. An industrial solution of titanyl sulphate used to produce titanium white was used in the present investigations. It was found that the course of hydrolysis clearly depended on the investigated parameters. The anatase nuclei calcined at 373 K and 333 K and rutile nuclei increased the degree of titanyl sulphate hydrolysis as compared to non-nucleation hydrolysis. The final degree of hydrolysis was by 1–2 % higher than that achieved without any nuclei addition. The constant rates of both colloidal intermediate and final crystalline products formation were higher in the hydrolysis process with both anatase nuclei after heat treatment at lower temperature and rutile nuclei in comparison to the same processes conducted in the absence of these nuclei.

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