[Chemical Knowledge]：The nature, use, upstream and downstream raw materials, storage method, solubility of sodium isophthalate 5-sulfonate.

SODIUM ISOSIPHTHALIC ACID -5-SULFONATE PROPERTIES

Sodium isophthalate (Sodium 5-Sulfoisophthalate, SIP) is a white to light yellow powder or crystal with good water solubility and high stability. The chemical formula is C8H5NaO7S and the molecular weight is 288.18g/mol. Its structure contains a sulfonic acid group (-SO3Na) and two carboxyl groups (-COOH), giving it unique chemical properties. This compound has good solubility in water, and exhibits an acidic environment after dissolution, and the pH value is about 3-5. SIP has poor solubility in organic solvents, but its solubility in alkaline solutions is significantly increased, which makes it widely applicable in a variety of industrial applications.

Sodium isophthalic acid -5-sulfonate use

SIP is widely used in the production of polyester fiber, polyester, PET bottles and other plastic products, as an important co-monomer. Due to the presence of its sulfonic acid group, SIP can give polyester materials better hydrophilicity and dyeing properties, which is particularly important for the textile industry. SIP is also used in the coatings, inks and adhesives industries to improve the flow and stability of products. In the water treatment industry, SIP can be used as an excellent dispersant and chelating agent to help prevent the formation of sediment and improve water treatment efficiency.

Upstream raw materials

The main raw materials for the production of SIP include isophthalic acid (Isophthalic Acid, IPA) and phosphorus pentoxide (Phosphorus Pentoxide, P2O5). Isophthalic acid is the core structural component of SIP, which is mainly derived from petrochemical industry and is prepared by oxidation method. Phosphorus pentoxide is the key raw material for the sulfonation reaction and is used to introduce sulfonic acid groups. Usually, these raw materials are sulfonated and neutralized by chemical reaction at high temperature to form SIP.

Downstream Products

The downstream products based on SIP mainly include various functional polyester fibers, dyeing auxiliaries and special-purpose coatings. The introduction of SIP can significantly improve the dyeing performance of polyester fiber, so that it can absorb dyes more evenly and improve the dyeing effect. In the field of coatings, SIP is used as a modifier to improve the adhesion and weather resistance of coatings. The application of SIP in some high-performance plastic products also makes it an indispensable chemical raw material.

ISOPHTHALIC ACID -5-SODIUM SULFONATE PRODUCTION PROCESS

The production process of SIP mainly includes two steps: sulfonation reaction and neutralization reaction. Isophthalic acid is sulfonated under the action of phosphorus pentoxide to generate isophthalic acid -5-sulfonic acid. In this process, the reaction temperature and time need to be strictly controlled to ensure that the sulfonation reaction is complete and efficient. The produced isophthalic acid -5-sulfonic acid is reacted with a basic substance (such as sodium hydroxide) to carry out a neutralization reaction, and finally sodium isophthalic acid -5-sulfonic acid is produced. The whole process needs to be carried out under strict process conditions to ensure the purity and yield of the product.

Sodium isophthalic acid -5-sulfonate storage method

Due to the high moisture absorption of SIP, special attention should be paid to moisture resistance during storage. It is recommended to store SIP in a dry, cool environment, away from direct sunlight and high temperature. SIP should be sealed storage to prevent contact with moisture in the air to avoid caking and performance degradation. The storage container shall be made of corrosion resistant materials to ensure the chemical stability of the SIP. For mass storage, it is recommended to use moisture-proof packaging, and regularly check the storage environment and product status to ensure the stability of its quality and performance.

Market Prospects and Challenges

The market demand for SIP mainly comes from industries such as textiles, coatings and water treatment. With the rapid development of these industries, the demand for SIP is also growing. The production cost of SIP is high, and some high-risk raw materials and complex processes are involved in the production process, which brings certain challenges to the production enterprises. The increasingly stringent environmental protection policies also require enterprises to take more stringent environmental protection measures in the production process to reduce pollutant emissions. In the future, with the advancement of technology and the improvement of environmental awareness, the production process of SIP is expected to be further optimized, and the market prospect is still broad.

Summary

Sodium isophthalate -5-sulfonate, as an important chemical raw material, has unique chemical properties and broad application prospects. It plays an important role in industries such as textiles, coatings and water treatment. Although there are some challenges in the production process, with the continuous progress of technology and the growth of market demand, the application prospect of SIP is still very broad. In the future development, enterprises need to continuously optimize the production process, improve product quality, and actively respond to the requirements of environmental protection policies to promote the healthy development of the SIP industry.