Chemical Industry

Chlor-Alkali Process: Hydrogen Handling & HCl Synthesis Analysis

2026-08-10 4

Hydrogen handling and hydrochloric acid (HCl) synthesis require precise control of gas purity, stoichiometric ratios, and trace moisture levels. Maintaining accurate measurements in these streams prevents downstream equipment corrosion, optimizes acid quality, and ensures safe operation. MZD Analytik provides robust analytical solutions designed specifically for these harsh chemical environments.

1. Key Process Control Points

Managing the hydrogen loop and HCl synthesis reactor requires continuous monitoring of composition and moisture across vital nodes.

Item	Process Location	Parameter	MZD Analytical Strategy
42	Hydrogen Header	H2 Purity	Thermal conductivity gas analyzer (range 99.0–100 vol%).
43	Hydrogen Header	O2 Content	Optical oxygen analyzer with MZD BaroSense™ Technology (≤0.5%).
44	Hydrogen Dryer Outlet	Trace Moisture	P2O5 electrolytic trace moisture analyzer (maintains moisture ≤5 ppm).
45	Synthesis Furnace Outlet	H2 Content	Corrosion-resistant thermal conductivity gas analyzer (excess H2 at 2–5%).
46	HCl Gas Header	HCl Concentration	Corrosion-resistant thermal conductivity gas analyzer (range 80–100 vol%).
47	HCl Gas Header	Cl2 Content	UV gas analyzer ensures Cl2 <1 ppm.
48	HCl Gas Header	Trace Moisture	P2O5 electrolytic trace moisture analyzer prevents downstream corrosion.

2. Advanced MZD Instrumentation for Hydrogen & HCl Systems

Thermal Conductivity Gas Analyzers with Special Materials

Process points such as the hydrogen header and HCl synthesis furnace outlet contain strong corrosive impurities like Cl2 and HCl. MZD thermal conductivity analyzers can be equipped with specialized measurement cells made of alumina ceramic Al2O3, glass, or quartz. This ensures long-term durability and stable operation in the harshest chemical environments, backed by ATEX/IECEx explosion-proof configurations.

MZD VaporSense™ Technology (Hydrogen Analyzer)

Water vapor and alkaline mist during hydrogen handling can introduce significant errors in traditional thermal conductivity measurements (often causing shifts of 1–5 vol% or exceeding ±10% under condensation conditions). MZD’s hydrogen analyzer incorporates VaporSense™ Technology, featuring advanced temperature and humidity compensation algorithms combined with anti-condensation and anti-dust designs to deliver stable, accurate readings.

P2O5 Electrolytic Trace Moisture Analyzers

Trace moisture in HCl gas and hydrogen dryer outlets must be tightly regulated to avoid acid formation and subsequent pipeline corrosion. Utilizing PVDF corrosion-resistant flow cells and absolute measurement technology, MZD's P2O5 analyzers ensure drift-free, high-precision monitoring.

3. Operational Benefits

Optimized Synthesis Ratios: Real-time monitoring of excess hydrogen and HCl concentration enables precise control of the synthesis furnace operation.
Enhanced Safety and Purity: Advanced humidity compensation and corrosion-resistant sensor designs eliminate false readings and protect against unexpected equipment failures.
Asset Protection: Strict trace moisture control prevents the formation of corrosive hydrochloric acid in dry gas headers.

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

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