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100% Benzenesulfonic acid, 2-amino-4-chloro-5-methyl-, monosodium salt
100% Benzenesulfonic acid, 2-amino-4-chloro-5-methyl-, monosodium salt
100% Benzenesulfonic acid, 2-amino-4-chloro-5-methyl-, monosodium salt

100% Benzenesulfonic acid, 2-amino-4-chloro-5-methyl-, monosodium salt

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  • Category

    o-Toluidine series

  • Describe

    Sodium 2-amino-4-chloro-5-methylbenzenesulfonic acid is a water-soluble white solid aromatic intermediate, mainly used in the synthesis of red azo pigments (such as the PR48 series).

  • Cas No.

    6627-59-4

  • Purity

    100%

  • Synonym(s)

    5-amino-4-chloro-2-methylbenzenesulfonic acid

Physical and chemical properties

  • 1.1. Chemical Identity
    • Chemical Name: Sodium 2-amino-4-chloro-5-methylbenzenesulfonate
    • IUPAC Name: sodium 2-amino-4-chloro-5-methylbenzenesulfonate
    • Synonyms: CLT Acid Sodium Salt; 2-Amino-4-chloro-5-methylbenzenesulfonic acid sodium salt.
    • CAS Number: 6627-59-4
    • EC Number: 229-601-0
    • Molecular Formula: $C_7H_7ClNNaO_3S$
    • Molecular Weight: 243.64 g/mol
  • 1.2. Physical Properties
    • Appearance: White to off-white, light grey, or slightly pinkish crystalline powder.
    • Odor: Odorless or very faint characteristic odor.
    • Melting Point: >300 °C (Decomposes before reaching a defined melting point).
    • Solubility: * In Water: Soluble (Higher solubility than the free acid form, CAS 88-51-7).
      • In Organic Solvents: Slightly soluble in ethanol; practically insoluble in non-polar solvents like ether or benzene.
    • pH: Typically 7.0–9.0 in aqueous solution (neutral to slightly alkaline).
  • 1.3. Chemical Properties and Stability
    • Stability: Stable under recommended storage conditions.
    • Incompatibilities: Incompatible with strong oxidizing agents and strong acids (which may cause the free acid to precipitate).
    • Hazardous Polymerization: Will not occur.
    • Hazardous Decomposition Products: Thermal decomposition can produce toxic fumes of nitrogen oxides ($NO_x$), sulfur oxides ($SO_x$), hydrogen chloride ($HCl$), and sodium oxides.
  • 1.4. Other Key Data
    • Flash Point: Not applicable (solid).
    • Autoignition Temperature: Not determined.
 

MSDS

100% Benzenesulfonic acid, 2-amino-4-chloro-5-methyl-, monosodium salt--MSDS     Download
 

Certificates Of Analysis

100% Benzenesulfonic acid, 2-amino-4-chloro-5-methyl-, monosodium salt--COA      Download
 

Application

Benzenesulfonic acid, 2-amino-4-chloro-5-methyl-, monosodium salt is mainly used as a water-soluble diazo component in the synthesis of high-performance red azo pigments such as the Red 48 series (PR48), and is widely used in coloring inks, coatings, plastics, rubber, etc.

Safety Information

  • This information is a summary based on the Globally Harmonized System of Classification and Labelling of Chemicals (GHS).
  • 2.1. GHS Classification
    • Skin Irritation (Category 2)
    • Eye Irritation (Category 2A)
    • Skin Sensitization (Category 1)
    • Specific Target Organ Toxicity — Single Exposure (Category 3), Respiratory System irritation.
  • 2.2. GHS Label Elements
    • Pictogram: Exclamation Mark (GHS07)
    • Signal Word: Warning
    • Hazard Statements (H-Statements):
      • H315: Causes skin irritation.
      • H317: May cause an allergic skin reaction.
      • H319: Causes serious eye irritation.
      • H335: May cause respiratory irritation.
  • Precautionary Statements (P-Statements):
    • Prevention:
      • P261: Avoid breathing dust/fume/gas/mist/vapors/spray.
      • P264: Wash skin thoroughly after handling.
      • P280: Wear protective gloves, eye protection, and face protection.
    • Response:
      • P302 + P352: IF ON SKIN: Wash with plenty of soap and water.
      • P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
      • P333 + P313: If skin irritation or rash occurs: Get medical advice/attention.
      • P337 + P313: If eye irritation persists: Get medical advice/attention.
    • Storage:
      • P403 + P233: Store in a well-ventilated place. Keep container tightly closed.
    • Disposal:
      • P501: Dispose of contents/container to an approved hazardous waste disposal plant.
  • 2.3. Summary of Primary Hazards
    • Health Hazards: Primarily acts as an irritant to the skin, eyes, and respiratory tract. Exposure to dust may cause coughing or sneezing. As an aromatic amine derivative, it may cause skin sensitization in susceptible individuals upon repeated contact.
    • Fire Hazards: The substance is not flammable, but like most organic powders, it may form combustible dust clouds in air if handled improperly in high concentrations.
    • Environmental Hazards: While specific aquatic toxicity data may be limited for the salt form, it should generally be prevented from entering sewers or watercourses to comply with local environmental regulations.

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