Chemical Industry

Chlor-Alkali Process: Chlorine Handling & Liquid Storage Analysis

2026-08-10 0

Chlorine handling involves cooling, drying, compression, and liquefaction. The core operational requirements are controlling trace moisture to prevent severe equipment corrosion and nitrogen trichloride explosion risks, while monitoring chlorine concentrations to meet environmental and quality standards.

1. Key Process Control Points

Effective management of the chlorine handling and liquid storage train requires monitoring specific parameters across critical nodes.

Item	Process Location	Parameter	MZD Analytical Strategy
28	Secondary Drying Tower Outlet	Trace Moisture	P₂O₅ electrolytic trace moisture analyzer (maintains moisture $le 10 ext{ ppm}$).
29	Chlorine Compressor Inlet	Trace Moisture	Protects compressor impellers and prevents wet chlorine ingestion.
30	Chlorine Compressor Outlet	Trace Moisture	Verifies drying performance and pre-cooler integrity.
34	Liquid Chlorine Storage Tank	Trace Moisture	Moisture $le 50 ext{ ppm}$ meets international premium-grade quality requirements.
38	Tail Gas Recovery System	Cl₂ Content	UV gas analyzer ensures compliant emissions.
40	Emergency Chlorine Absorption Tower	pH	Solid-state pH meter maintains pH $ge 10$ to prevent absorption failure.

2. Advanced MZD Instrumentation for Chlorine Handling

P₂O₅ Electrolytic Trace Moisture Analyzers

Moisture control in chlorine streams is exceptionally stringent to avoid wet-chlorine hydrolysis into hydrochloric and hypochlorous acids. MZD’s P₂O₅ electrolytic analyzers are engineered specifically for corrosive acidic gases.

Corrosion-Resistant Design: Features PVDF flow cells and specialized zirconia or glass sensors to withstand aggressive media.
Absolute Measurement Technology: Provides stable, drift-free operation without the sensor-aging issues common in traditional capacitive dew-point methods.
Low Maintenance: Requires only periodic phosphoric acid regeneration every 3 to 6 months.

UV Gas Analyzers (Tail Gas & Emergency Scrubber)

For monitoring chlorine content in tail gas recovery and emergency scrubber outlets, MZD utilizes advanced UV absorption spectroscopy. These analyzers offer high selectivity for halogen gases and remain unaffected by background water vapor, carbon monoxide, or carbon dioxide.

3. Safety and Operational Benefits

Corrosion & Leak Prevention: Maintaining trace moisture below target thresholds prevents dry chlorine from turning into highly corrosive wet acid, extending equipment lifespan.
Mitigating Explosion Hazards: Proper moisture monitoring minimizes the risk of brine leakage mixing with chlorine, which forms dangerous nitrogen trichloride ($NCl_3$) accumulations.
Global Quality Compliance: Ensures liquid chlorine storage meets international $le 50 ext{ ppm}$ premium-grade criteria.

For detailed technical datasheets or site-specific application consultation, please contact our support team at sales@mzdd.de.

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