(223c) A Novel Sensing Technology for Online Detecting Reaction State and Fluid Mixing Using Electrical Resistance Tomography
AIChE Annual Meeting
2022 Annual Meeting
Topical Conference: Sensors for Sustainability
Monday, November 14, 2022 - 4:10pm to 4:25pm
In this research, ERT uses an array of 16 electrodes located equidistant in a layer around the inside of the vessel. As fluids flow past the measurement plane, conductivity is measured in the 2D plane. The information on the state of the reaction and the fluid mixing can be extracted from the data of ERT measurements. Our ERT system can collect more than 1000 datasets per second with 104 data points per dataset. Multiple test cases over a range of vessels, volumes, and chemical concentrations have been done. From 0.05 M to 4 M HCl and H2SO4 titrated with 0.1 M to 5 M NaOH. Figure 1 shows online real-time ERT measurements to detect the titration reaction's endpoints for (a) 0.25M HCl titrated with 1M NaOH, (b) 0.25M H2SO4 titrated with 1M NaOH. When compared to other methods to find the endpoints of the reactions, it can be seen that the start of the upward trend after the dip matches up closely to those measured endpoints. Additionally, more accurate time points can be obtained by the ERT system comparing to other methods. Another significant benefit of the 2D planar measuring is the ability to monitor the fluid mixing. Figure 2 reveals a location with slower mixing relative to the rest of the vessel. Knowing where these spots exist allows for monitoring the products for any potential defects due to this imperfect mixing. This novel technology can be potentially used in large reactors where visibility, testing access, or conditions restrict access to the vessel, such as higher pressure and temperatures.