Multi-Channel Capacitive Water Content Profiling
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Solution Overview
Problem
Current methods for analyzing water distribution and phase boundaries in produced oils are labor-intensive, hazardous due to the use of toxic and flammable solvents, and limited in their ability to provide continuous measurements across multiple vertical levels, making it difficult to effectively manage water content and interfacial tensions in industrial processes.
Innovation Solution
A multi-channel scanning water analyzer (MCSWA) and tensiometer system that uses capacitive sensors and a motorized precision vertical stage to continuously measure water content profiles, surface/interfacial levels, and interfacial thicknesses in multiphase dispersions, allowing for simultaneous analysis of up to 16 channels with a data acquisition system for precise chemical screening and quality assurance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional lab methods (centrifuge, distillation, Karl Fischer titration) are used for water analysis, then water content can be measured at specific vertical levels, but the process is labor-intensive, requires toxic and flammable chemicals, and can only provide discrete point measurements rather than continuous profiles
Solution Approach 1:
The patent replaces traditional mechanical/chemical measurement systems (centrifuge, distillation apparatus, titration equipment) with an electrical field-based capacitive sensing system. The capacitive sensors measure water content through electrical field interactions with the multiphase dispersion, eliminating the need for mechanical separation devices and chemical reagents while enabling continuous profiling across multiple vertical levels simultaneously
Solution Approach 2:
The invention transitions from discrete point measurements (single vertical level) to continuous spatial profiling across multiple vertical dimensions. By deploying multiple capacitive sensors at different heights and using a scanning mechanism, the system creates a continuous water content profile throughout the entire sample volume, adding spatial dimensionality to the measurement process
2Measurement precision
If centrifuge method is used for water distribution analysis, then water content can be measured, but it requires at least 5 ml sample per level and is extremely difficult to take multiple samples from a limited volume bottle
Solution Approach 1:
The capacitive sensing system replaces the centrifuge separation method, eliminating the need for mechanical sample withdrawal and physical separation. The electrical field penetrates the entire sample volume non-invasively, allowing measurement of water distribution throughout the bottle without removing any material, thus preserving the complete sample for potential re-analysis
3Measurement precision
If distillation method is used for water content measurement, then accurate water content can be obtained, but it requires large volume samples (25-200 ml) making it unsuitable for water distribution analysis in small bottles
Solution Approach 1:
The patent replaces the distillation apparatus and thermal processing system with capacitive sensors that operate at ambient conditions. The electrical field-based measurement requires minimal sample volume and can function with the small bottles (150-200 ml) used in the study, eliminating the need for large-volume distillation setups
4Difficulty of detecting and measuring
If phase boundary visual identification is attempted for heavy oils, then phase boundaries can be identified, but it is very difficult due to their dark, viscous and sticky nature
Solution Approach 1:
The patent introduces capacitive sensors as an intermediary measurement tool that indirectly detects phase boundaries through electrical field interactions. Instead of relying on direct visual observation of the dark, viscous interface, the system measures capacitance changes that occur at phase transitions, providing clear electrical signals that mark the location of phase boundaries without requiring visual clarity
5Productivity
If multiple capacitive sensors are used for continuous measurement, then water content profiles can be obtained efficiently, but the device complexity increases
Solution Approach 1:
The patent designs a multi-functional scanning system where a single apparatus performs multiple operations: it scans multiple vertical levels, measures water content at each level, identifies phase boundaries, and characterizes interfacial properties. The motorized positioning system and data acquisition unit serve universal purposes across all measurement tasks, reducing overall system complexity despite the multi-channel sensing capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables continuous, efficient, and environmentally friendly measurement of water content profiles and interfacial tensions across multiple samples, reducing the need for hazardous chemicals and improving the accuracy of chemical selection and process optimization in industrial applications.
Implementation Method 1
A multi-channel scanning water analyzer (MCSWA) and tensiometer system that uses capacitive sensors
Implementation Method 2
the capacitances of the sensors are continuously measured by the data acquisition system. The measured sensor capacitances are then used to derive water content profiles
Data Source
AI summary
An apparatus and method for simultaneously measuring water content profiles, surface/interfacial levels, thicknesses and tensions of multiphase dispersions, such as dispersions with water dispersed in produced oils, crude oils, various fuels, distillates, lubricants, paints and polymers, or reversed dispersions with these organic components dispersed in water. The apparatus with 1-16 channels, namely multi-channel scanning water analyzer (MCSWA) and/or tensiometer, comprising a motorized precision vertical stage with multiple capacitive sensors, a heating system with multiple heating cells for keeping the respective sample bottles, and a data acquisition system, where the capacitive sensors can be precisely controlled via a computer to dip into the samples at a preset scanning velocity and the capacitances of the sensors are continuously measured by the data acquisition system. The measured sensor capacitances are used to derive water content profiles, surface/interfacial levels, interfacial thicknesses and surface/interfacial tensions of the respective samples. The apparatus is a good tool for R&D scientists to select chemicals efficiently and can provide reliable data for engineering design and product quality assurance.