C Acid price December 2025 and outlook (see chart below)
- Northeast Asia:US$5.16/KG, -4.1% down
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C Acid price index
This post is a summary of the C Acid price developments since 2017. The price developments are expressed as a price index in US$ prices converted at current FX rates, which are the FX rates applicable at the time the price was valid. C Acid price index developments are calculated from multiple separate sources of data to ensure statistical accuracy.
Further information on the C Acid price index
What is c acid
2-Amino-4,8-naphthalenedisulfonic acid, also known as c acid, is a chemical compound with the molecular formula C10H9NO6S2. It is an aromatic amino acid with a disulfonic acid group (-S(O)2OH) attached to the 2-position of the naphthalene ring. C acid is a white to pale yellow solid that is slightly soluble in water and soluble in organic solvents. It is used as a starting material in the synthesis of a variety of chemicals and pharmaceuticals.
How is c acid produced
There are several ways to synthesize 2-amino-4,8-naphthalenedisulfonic acid, depending on the starting materials and the desired yield and purity of the final product. Here is one example of a synthesis of 2-amino-4,8-naphthalenedisulfonic acid:
2-Naphthalenesulfonic acid is treated with a strong base such as sodium hydroxide to convert it to the sodium salt.
The sodium salt is then treated with a reducing agent such as sodium hydrosulfide to convert it to 2-amino-4,8-naphthalenedisulfonic acid.
The resulting mixture is cooled and filtered to remove any solid impurities, and the filtrate is concentrated under reduced pressure to give 2-amino-4,8-naphthalenedisulfonic acid as a white to pale yellow solid.
This is just one example of a synthesis of 2-amino-4,8-naphthalenedisulfonic acid, and there may be other methods that are used depending on the specific requirements and conditions of the synthesis.
What is c acid used for
2-Amino-4,8-naphthalenedisulfonic acid, also known as c acid, is a chemical intermediate that is used as a starting material in the synthesis of a variety of chemicals and pharmaceuticals. Some examples of compounds that can be synthesized from c acid include:
Dyes
Such as reactive dyes and disperse dyes, which are used in the textile, paper, and printing industries.
Pigments
Such as phthalocyanine pigments, which are used in a variety of applications including printing inks, coatings, and plastics.
Pharmaceuticals
Such as nonsteroidal anti-inflammatory drugs (NSAIDs) and anti-cancer agents.
Flavors and fragrances
Used in a variety of consumer products including food, beverages, and personal care products.