Chlorine is obtained by electrolysis of a Sodium Chloride and water solution. Initially, it looks like a greenish-yellow gas with a strong and unique odor. Gaseous Chlorine is pressurized at low temperature to liquefy it and turn it into a light amber color liquid. Therefore, it has a liquid form under pressure and a gaseous form at atmospheric pressure.

Its concentration (volume) is 99.50% v/v of CI2, approximately.

Bulk Chlorine can be transported in tanker trucks and/or ISO tanks, provided they are intended to products shipment and have all security devices.

Chlorine is a critical product for human development and a strong bactericide. Guaranteeing health and quality of life, it is widely used in drinking water treatment and basic sanitation.

Manufacture Process: Cubatão Plant

To produce Chlorine, an electric current is sent through a treated brine solution (regular salt dissolved in water). This process is called electrolysis. The other products resulting from this process are Caustic Soda (Sodium Hydroxide or NaOH) and Hydrogen (H2). It is a liquified gas that goes through the cooling, drying and compression stages to be marketed.

For every ton of Chlorine 1.1 tons of Caustic Soda and 0.03% tons of Hydrogen are produced.

Technical information - Physicochemical features

Chemical formula


Melting point

-100.98 ºC

Molecular weight


Boiling point

-34.05 ºC (1 atm)

Vapor density (ar=1)


Liquid density (water=1)

1,4 – 15 ºC

Vapor pressure

27.48 mm Hg at ºC

Solubility in water (% of CI2 per weight)

0.7% – 20 ºC

(*) Non-flammable, but it can be combustible to some substances in certain conditions.

Validity period: 6 months from invoice.

Source: Brazilian Association for the Chlor-Alkali and Derivatives Industry (Abiclor)


Chlorine is a product found in people’s daily lives and it is widely used in PCV manufacture, drinking water and pools treatment, sewage treatment, chlorinated and agrochemical solvents manufacture, and as intermediary in polyurethanes production.

It is also used to obtain different chemicals such as anticoagulants, lubricants, brake fluids, polyester fibers, pharmaceutical inputs, etc.

And it is used as raw material in Hydrogen Chloride, Hydrochloric Acid, Sodium Hypochlorite and Dichloroethane production process.

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Sodium Hypochlorite Reactor

 Hypochlorite is produced by a reaction between gaseous Chlorine and a Caustic soda solution being cooled down.


EDC Reactor

EDC (Dichloroethane) is obtained through a reaction between liquid chlorine and ethylene (inserted through a tube) and it is purified by distillation.


Hydrochloric Acid Reaction Furnace

Hydrochloric acid is produced by a controlled combustion reaction of Chlorine and hydrogen, followed by absorption in treated water.



Caustic soda is produced by electrolysis and reduced through the evaporation process.



 Then, the Soda is cooled down and stored in tanks, before being shipped.


(8) Cooling Chlorine

(9) Chlorine Withdrawal

(10) Chlorine Compression

(8) The produced gaseous chlorine is cooled down, (9) dried out and (10) compressed. After being compressed, it turns into a liquid state at low temperature.


(3) Treatment

(4) Filtration

(5) Control

(3) The PICKLE is about eliminating foreign bodies; it is filtered (4) and undergoes a strict control (5) before feeding the ELECTROLYTIC CELLS.


(3) Tratamiento

(4) Filtración

(5) Control

(3) La salmuera se trata para eliminar impurezas, se filtra (4) y pasa por un estricto control (5) para alimentar las CÉLULAS ELECTROLÍTICAS.



If there are salt (sodium chloride) and water in stock, you need to supply our transformers with electricity.


(11) Licuefacción de Cloro

(12) Almacenamiento de Cloro

(11) El cloro en esta forma se almacena en tanques (12) donde se carga en camiones especiales


Sala de Celdas

La ELECTRÓLISIS tiene lugar en la celda. Y así, la energía eléctrica actúa sobre la salmuera y la transforma en SODA CÁUSTICA, CLORO E HIDRÓGENO.

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A Soda Cáustica é produzida na eletrólise e concentrada pelo processo de evaporação.


Cell Room

The ELECTROLYSIS takes place in the cell. This way, electric energy acts on the brine and transforms it into CAUSTIC SODA, CHLORINE AND HYDROGEN.


(3) Tratamento

(4) Filtração

(5) Controle

(3) A SALMOURA é tratada para eliminar impurezas, filtrada (4) e passa sob um rigoroso controle (5) para alimentar as CÉLULAS ELETROLÍTICAS.



Next, prepare the PICKLE obtained from dissolving the salt in the water to use afterwards in the ELECTROLYSIS.