Introduction
Process liquid analyzers such as pH meters, conductivity meters, ORP meters, and density meters play an important role at electrolysis plants in the control of concentrations of various process solutions. This requires both precision and stability under harsh conditions that include highly corrosive substances, high temperatures, and many impurities.
Expected Benefits
- Ensures stable, continuous measurement in heavily contaminated liquids
- Reduces operating costs
- Eliminates the need for manual cleaning
List of Analyzers
Type | Measurement point | Objective |
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pH meter | 1) Supersaturated brine at raw salt dissolver outlet *1 | pH control for impurity removal in brine Control value: 10.8 to 11.0 pH |
2) Refined brine *2 | Control of precipitation of impurities Acid range | |
3) Brine at electrolysis tank inlet *3 | pH control of electrolysis tank brine inflow: 3 to 6 pH | |
4) Return brine at electrolysis tank outlet *4 | Efficiency control in dechlorination tank Acid range | |
5) Desalinated water at dechlorination tank outlet *5 | Desalinated water control | |
6) Hydrochloric acid plant drainage *6 | Drainage control | |
Conductivity meter | 1) Supersaturated brine at electrolysis tank outlet *7 | Brine concentration control: concentration: 300 to 320 g/l |
2) Refined brine *8 | Refined brine concentration control | |
3) Sulfuric acid concentration used for drying in chlorine gas drying line *9 | Concentration control of recovered sulfuric acid: approximately 74 % | |
4) Hydrochloric acid concentration in hydrochloric acid plant *10 | Hydrochloric acid concentration control: approximately 35 wt% | |
5) Sodium hypochlorite concentration in a soda hypochlorite plant *11 | Sodium hypochlorite concentration control: Available chlorine: 10 to 15 % Residual caustic soda: 0.1 to 1% (approximately 10 g/l) |
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Oxidation reduction Potential (ORP) meter | 1) Desalinated water at dechlorination tank outlet *12 | Confirmation of dechlorination reaction |
2) Soda hypochlorite plant adsorption tank outlet *13 | End control of caustic soda chlorination reaction | |
Vibration type liquid density meter | 1) Anode solution at electrolysis tank outlet *14 | Anode solution caustic soda concentration control |
2) Caustic soda concentration at concentrate drum outlet *15 | Product caustic soda concentration control |
Solution Details
Conclusion
Yokogawa process solution analyzers deliver stable, long-term measurements under the harsh conditions present in electrolysis plants. The FLXA202/FLXA21 Inductive Conductivity Meter is specially designed to detect the concentrations of hydrochloric acid, sulfuric acid, and caustic soda. The PH4C pH Sensor for Chemical Processes can measure pH in a wide variety of processes.
Field Data
Each graph shows a correlation between concentration and conductivity at measurement points, the numbers of which correspond to the ones in the previous page. The ISC inductive conductivity meter's range can be specified, thereby allowing high-resolution measurements in the target concentration range.
The correlation between concentration and conductivity is largely affected by solution temperature. The ISC inductive conductivity meter provides automatic temperature compensation using the build-in temperature sensor.
Industrias
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Especialidades y productos químicos finos
Yokogawa ha servido durante mucho tiempo a los clientes en el mercado de productos químicos de especialidad y finos. Con una solución por lotes líder en el mercado que ofrece la mejor fiabilidad de clase y flexibilidad, así como expertos de la industria que entienden los complejos requisitos en el diseño de una solución por lotes, puede estar seguro de que en su asociación con Yokogawa tendrá un sistema que le permitirá producir productos que satisfagan las necesidades de sus clientes en el futuro, mientras mantiene la seguridad y el cumplimiento normativo.
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Química
Las plantas químicas dependen de procesos de producción continua y por lotes, cada una de los cuales impone diferentes exigencias para un sistema de control. Un proceso continuo exige un sistema de control robusto y estable que no falle y provoque el cierre de una línea de producción, mientras que en un proceso por lotes el énfasis se centra en tener un sistema de control que permita una gran flexibilidad para realizar ajustes a fórmulas, procedimientos y otros elementos. Ambos tipos de sistemas necesitan ser administrados en el historial de calidad del producto disponible, así como tener la capacidad de ejecutar operaciones no rutinarias. Con el respaldo de su extenso portafolio de productos, un equipo de experimentados ingenieros en sistemas y una red global de ventas y servicio, Yokogawa ofrece una solución para cada proceso productivo.
Productos y Soluciones Relacionadas
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2-Wire Transmitter/Analyzer FLXA21
The FLEXA™ series analyzers are used for continuous on-line measurements in industrial installations. With an option for single or dual sensor measurement, they are the most flexible two-wire analyzer available.
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All-in-One pH/ORP Sensor Series FU20 and FU24
The FU20 and FU24, all-in-one pH and ORP, sensors show how Yokogawa applies the motto "Simple is best" to sensor technology.
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Digital SMART SENCOM™ Adapter, SA11
Reusable SMART adapter, requiring only the analog sensor to be disposed of when it reaches the end of its lifetime. With the SENCOM 4.0 platform, Yokogawa delivers reduced costs and waste while contributing to its long-term business goals of a sustainable future for all.
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Flow/NPT Fittings FF20/FS20
FF20/FS20 Fittings for pH and ORP
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Hot-Tap Holder PR10
Universal retractable assembly for all liquid measurements
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Industrial pH/ORP Electrodes
The heart of a pH measuring loop is the electrode system. Yokogawa has designed a wide range of electrodes to ensure this heart keeps beating under the most severe conditions.
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Multi Channel 4-Wire Analyzer FLXA402
Available in single or multi-sensor measurement
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Toroidal/Inductive Conductivity Sensor ISC40
Superior conductivity measurement reliability, accuracy, and rangeability
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pH and ORP Sensors
Ensure fluid process operations
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