Chlor-Alkali Solutions

In addition to the construction of new membrane plants on greenfield sites, our know-how also lies in the conversion of existing process plants. Our extensive experience means we are specialists in the entire process chain, from salt dissolution to electrolyzers and on to the further processing of electrolysis products.

Know-How

In combination with first-class electrolyzer technology, such as that of our technology partner Asahi Kasei Corporation, we offer you the following benefits:

Low energy consumption
No environmental impact from amalgam or asbestos
High production purity
Simple handling and operation
Low investment and operating costs

Electrolysis occurs with modern membrane electrolyzers, in accordance with the conclusions of the BREF document (Best Available Technology Reference Document) for the chlor-alkali industry.

Raw materials and products

The electrolysis of a salt solution (NaCl or KCl solution) produces the products caustic soda or potash (NaOH or KOH solution), chlorine (Cl₂) and hydrogen (H₂).
The salt comes from seawater (solar salt NaCl), mineral deposits (rock salt NaCl or KCl) or salt from evaporation processes (evaporated salt: NaCl or KCl).

The primary products of chlor-alkali electrolysis (NaOH as 32 % caustic or KOH as 29 % to 32 % caustic, hydrogen gas and chlorine gas) can be transformed into the following storable commercial products:

Hydrochloric acid 32 % to 36 %
Caustic soda 50 % / potash 50 %
Liquid chlorine:
- stored at low pressure, e.g.: -34 °C / 1 bar (abs.) or
- stored at high pressure, e.g.: +20 °C / 6.8 bar (abs.)

The chlorine can also be transported directly for further processing as a dry and compressed gas via a pipeline system.

Technology and electrolyzers

Our technological range of services comprises the entire chain from salt dissolution, brine preparation and electrolysis to the further processing of the products. (Graphic representation)

Technology
The complete chlor-alkali plants include the following sections:

Salt dissolution from rock salt, evaporated salt or solar salt
Primary brine purification
Fine brine purification
Electrolysis with transformer and rectifier
Catholyte and hydrogen treatment
Anolyte and chlorine gas treatment
Drying, compression, liquefaction and storage of chlorine
Evaporation and loading of caustic
Optional: NaOH (KOH) flaking or prilling, bagging and loading
Chlorine absorption system: Emergency absorption, optionally with hypochlorite production
Hydrochloric acid synthesis (HCl 30 % - 36 %)

Chlor-alkali electrolysis based on membrane cell technology

2006

Navoi, UZ

Chlor-alkali electrolysis

2001

Phone:	+49 371 6899 0
E-Mail:	info@cac-chem.de