Sodium chlorite for producing chlorine dioxide

Production

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Aerial view of the plant in the 60

Caffaro Brescia S.r.l. has got a tradition and a historical development in the production of the Sodium Chlorite since 1960s. In the chart below it is shown the technological history of the sodium chlorite production process:

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Sodium Chlorite solution 25% or 31% w/w or in special formulation is produced in the historical factory of Brescia, featuring a highly integrated, advanced technology in a plant with the highest production capacity in the world (900 kg/h of chlorine dioxide – ClO2 ). The product fully satisfies the chemical and physical properties required by the European Standard EN -938 – Chemicals used for treatment of water intended for human consumption: sodium chlorite, Type 1, with the lowest concentration of toxic metals. Caffaro Brescia S.r.l., in coordination with “sodium chlorite for producing chlorine dioxide” of CEFIC group has notified the sodium chlorite and chlorine dioxide as required by Biocidal Directive Product 98/8/CE. For not biocidal applications Caffaro Brescia S.r.l. has also registered (REACH Regulation 1907/2006) sodium chlorite to ECHA (European Chemical Agency) in 2010 (registration number: 01-2119529240-51-001).

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The production plant is designed to produce high quantities through a safe process production. For these reasons both the process and the product are Quality Certified in compliance with EU-ISO-9001:2008.

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Sodium chlorite solution


Quality of the products and Regulations

Sodium Chlorite Solution satisfies the chemical and physical properties  required by the European Standard EN 938 (April 2009) Chemicals used for treatment of water intended for human consumption: sodium chlorite, Type 1, with the lowest concentration of toxic metals and low concentrations of other by-products.

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Both products fully satisfy the quality requirement of Type II (For further information please contact Caffaro Brescia S.r.l.)


Regulations

Caffaro Brescia S.r.l. in coordination with CEFIC group “sodium chlorite for producing chlorine dioxide” has notified chlorine dioxide as active substance and sodium chlorite as precursor according to the Biocidal Directive Product  98/8/CE (which is now called B.P.R. Biocidal Product Regulation) for the following PTs ( Product Type):

  •  PT-2 Private area and public health area
  •  PT-3 Veterinary hygiene biocidal products
  •  PT-4 Food and feed area disinfectants
  •  PT-5 Drinking water disinfectants
  •  PT-11 Preservatives for liquid-cooling and processing systems
  •  PT-12 Slimicides
    • Risk Analysis

For not biocidal applications Caffaro Brescia S.r.l. has also registered (REACh Regulation 1907/2006) sodium chlorite to ECHA (European Chemical Agency) in 2010 (registration number: 01-2119529240-51-001).

CAS number 7758-19-2

EINECS number 231-836-6

Classification

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Uses and applications

Caffaro Brescia S.r.l. is active and present with the technology of chlorine dioxide in the following areas of applications.

Drinking Water

Chlorine Dioxide is a safe and efficient alternative to chlorine and hypochlorite for the following reasons:

  1. High and selective oxidation potential
  2. Negligible formation of halogenated organic compounds (THM-AOX)
  3. Good control of the organoleptic characteristics of water
  4. Good stability in the treated water
  5. Good efficiency against bacteria, virus, mushrooms and algae due to the diffusivity through the cell membrane (gas phase)
  6. Active and stable in the pH range 6,0 – 9,5

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Wastewater (civil, industrial, hospital)

Chlorine Dioxide has got a high and selective oxidation potential compared to other chemicals:

  1. Good efficacy against bacteria, virus, protozoa, fungi, algae due to the diffusivity through the cell membrane
  2. Short time of contact.
  3. Negligible formation of halogenated organic compounds (THM-AOX).
  4. Good control of the organoleptic characteristics of the treated water.
  5. Good efficacy against fouling – biological stuff.
  6. Active and stable in the pH-range 6,0 -9,5

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Water in cooling industrial circuits (biofouling)

Fouling is the accumulation of undesirable material on solid surfaces to the detriment of function. The fouling materials can consist of either living organisms (biofouling) or a non-living substance (inorganic or organic). It can reduce the flow and compromise the efficiency of cooling systems. The chlorine dioxide is:

  1. Environmental Friendly (negligible formation halogenated by-products).
  2. Highly efficient against colonizing bacteria on the surfaces.
  3. Highly efficient against the adherence of the macro-fouling species.
  4. Flexible in dosages, time of contact and dosages’ gaps.
  5. Low aggression on materials (metallic surfaces).

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FOTO-25Process water in paper mills (antislime)

Chlorine dioxide can be safely used for water treatments at paper mills. The development of bacteria, fungi and algae in the pipes and tanks gives rise a viscous deposit commonly called “slime” which can cause problems to the production. Chlorine dioxide controls the formation of the slime limiting the presence of bacteria.

FOTO-26Food industry water

Chlorine dioxide is widely used in food industry.

FOTO-27Textile Industry (bleaching)

Chlorine dioxide is widely used in chemical pulp bleaching.

Oil and Gas

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Sodium Chlorite and Chlorine Dioxide avoid the growth of Biomass and they reduce the following problems:

  1. Biological fouling formation and deposit corrosion with pipes obstructions ( piping plugging).
  2. S.R.B. growth producing H2S (sour corrosion).
  3. Microbiological corrosion (M.I.C) and under deposit corrosion.
  4. Degradation of “casing” structure.
  5. Formation of abrasive materials (FeS).

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Gaseous emissions (NOx deodorization)

Sodium Chlorite and/or chlorine dioxide, depending on the pH of the water flow can be applied to oxidize and destroy gaseous substances. The contact time is short and the excess of chlorine dioxide, if present, can be easily destroyed by a reducing agent (base sulphur).

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