Introduction:

Isothiazolinones, specifically CIT/MIT, are a class of compounds known for their biocidal properties. They are represented by various names such as 5-Chloro-2-Methyl-4-Isothiazolin-3-One and are identified by the CAS number 26172-55-4. These compounds are widely used as preservatives and biocides in industrial settings.

Chemical Profile:

      Molecular Formula: C4H5Cl2NOS
      Molar Mass:186.06 g/mol
      Density:1.25 g/cm³ (14% aqueous solution)
      Melting Point:42-45°C
      Boiling Point:200.2°C at 760 mmHg
      Flash Point:74.9°C
      Appearance:Liquid

Storage Conditions:

Isothiazolinones should be stored in a low-temperature, ventilated, and dry warehouse to maintain their stability and effectiveness.

Applications:

      Industrial Water Treatment:

           Isothiazolinones are used for sterilization in industrial circulating water systems,                           effectively controlling algae, bacteria, and fungi.

      Preservative:

           They serve as a broad-spectrum preservative in various industries, including cooling                     water systems, oil field back tank water, paper industry, pipelines, paints, rubber,                           cosmetics, photographic film, and washing products.

      Efficiency and Safety:

            They are used in minimal quantities, are non-toxic and pollution-free, and can be easily                mixed into various formulations.

      pH Range:

            They have a wide pH range and can be diluted to concentrations that are biodegradable              into non-toxic, pollution-free substances.

      Oilfield Applications:

             Isothiazolinones are used in the oilfield industry as slime stripping agents at                                 concentrations of 150-300 mg/L and as fungicides at 80-100 mg/L, applied every 3 to 7               days.

      Compatibility:

             They can be used in conjunction with oxidizing biocides like chlorine gas but are not                   recommended for use in cooling water systems containing sulfides.

      Synergy:

             The effectiveness of isothiazolinones is enhanced when used with quaternary                               ammonium salts.

      Concentration:

             As an industrial bactericidal and antifungal agent, the general concentration ranges                     from 0.05% to 0.4%.

Conclusion:

Isothiazolinones (CIT/MIT) are valuable compounds in industrial microbiological control due to their broad-spectrum activity, low toxicity, and environmental compatibility. Their versatility allows for use across a range of applications, making them essential in maintaining hygiene and controlling microbial growth in various industrial processes.