FROM SODIUM CHLORIDE
The plant is based on membrane technology and on the availability of raw salt, demineralized water, chemical reagents, electric power and plant utilities.
Product obtained is sodium hypochlorite solution at 12.5% as active chlorine, to be diluted to the requested final concentration.
Standard plant capacities are 3 Ton/Day or 5 Ton/Day of chlorine, corresponding to 25 Ton/day or 40 Ton/Day of sodium hypochlorite solution at 12.5%.
Designed to obtain
Active chlorine concentration
Perfect if you need
large volumes production
25 or 40 Ton/Day
Typical plant is composed of the following main sections:
– Brine preparation and treatment
– Catholyte handling
– Sodium hypochlorite synthesis
MADE IN ITALY/EU
Our plants are designed and manufactured entirely in Italy and EU.
We respect European standards and maintenance of ISO 9001 certification.
COMES FROM EXPERIENCE
We constantly improve to assure the best quality and the newest technologies
The production of chlorine, caustic soda and hydrogen is obtained by electrolysis of a concentrated NaCl solution. Weak or depleted dechlorinated brine from the membrane cells is returned to saturation by dissolving additional NaCl salt in the brine saturation unit.
The basic reaction in the electrolysis process is as follows:
NaCl + H2O → NaOH + ½ H2 + ½ Cl2
It takes place in the electrolyzer, which single cell comprises an anode compartment made from titanium, a membrane installed between anode and cathode compartments and a cathode compartment made from nickel.
The energy consumption in a membrane cell process is in the order of 2100÷2150 kWh/ton of NaOH.
A chilled water cooled heat exchanger is part of the reaction loop.
The plant includes several units:
Brine dechlorination: The depleted brine coming from the electrolyzer must be dechlorinated to remove any chlorine trace before being delivered to the saturation unit.
Brine saturation: Additional raw salt is added to the depleted brine in the saturator together with process water. The optimum NaCl concentration range is 295÷305 gpl.
Brine primary purification: Chemicals are added to the brine stream to remove mainly Ca+2 and Mg+2 cations and SO4-2 anions. Precipitates are collected in a receiver while treated brine is sent to filtration.
Brine filtration: Treated brine is filtered to remove suspended solids as CaCO3, Mg(OH)2 and BaSO4.
Brine super purification: After filtration, brine is sent to the brine super purification towers. It flows through a bed of ion-exchange resin in order to reach the purity level requested by the membrane electrolyzer process. Modern technology is based on two or three resin bed towers. Concentration of Ca+2 and Mg+2 is so reduced to less than 20 ppb.
BRINE SLUDGE TREATMENT
Sludge filtration: Brine sludge are collected and sent to a filter-press type filter. In this equipment sludge dewatering takes place. The recovered brine is recycled back to the brine system, the sludge cake is sent to disposal.
CHLORINE GAS TREATMENT
Cooling: Chlorine gas stream is cooled to condensate the maximum amount of water vapour leaving the anodic chamber with the gas phase. It is then sent to the hypochlorite synthesis section.
HYDROGEN GAS TREATMENT
Cooling and discharging: Hydrogen gas stream is cooled to remove the water content. It is vented to atmosphere through a flame arrestor.
Cooling and dilution: The 32% caustic soda stream leaving the cathodic chamber is cooled. A portion is recycled back to the electrolyzer while the other part is diluted with demineralized water down to 18% concentration required by the synthesis of sodium hypochlorite at 12.5%.
SODIUM HYPOCHLORITE PRODUCTION
Synthesis process: Sodium hypochlorite is produced by intimate contact between caustic soda and chlorine. The synthesis reaction takes place under continuous operation in a liquid jet ejector. Available concentration range is between 12.5 ÷ 15.5%. Final dilution with demineralized water allows the achievement of requested commercial concentration.
EXPERIENCE IN DESIGN AND
CONSTRUCTION ALL OVER
We supply plants all over the world, from Saudi Arabia to Kuwait, from Ukraine to Greece, from Egypt to Nigeria.
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