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Titanium Dioxide Production (pH/ORP)

Titanium Dioxide Production


Titanium dioxide (TiO2) is a common additive for paints, inks, cosmetics and plastics. The product has a high refractive index which provides whiteness and opacity making it ideal for covering over surfaces. This paper reviews several processes for TiO2 production and looks at the important role that pH measurement serves to control the end product quality.

Measurement Challenges
While pH measurement is critical for TiO2 production it is also quite difficult. Elevated temperature in the hydrolysis stage can shorten sensor life. Throughout the process fine particulates are well known to coat and plug the porous reference junction used in pH sensors. Once the reference junction is plugged by particulates, the pH sensor is slow to respond to changing pH levels. These applications are often maintenance intensive with frequent cleaning and sensor replacement.

Barben Analytical Performance Series pH sensors are uniquely designed to provide long life and less maintenance in titanium dioxide production applications. The patented Axial Ion Path™ reference uses an extremely large Teflon junction at the tip of the sensor. The extra surface area of the Teflon junction makes it difficult to coat over thus providing long-term electrolyte contact with the process, less cleaning and less frequent calibration intervals. An added benefit of the large junction is that when cleaning of the sensor is eventually needed, the non-stick Teflon surface is much less labor intensive than tiny, recessed ceramic junctions that are often used in traditional pH sensors. A soft bristle brush is often sufficient to remove build-up.