Sodium isophthalic acid-5-sulfonic acid (also known as sodium 5-sulfoisophthalate) is an important raw material for the production of chemicals, which is widely used in the fields of dyestuffs, pharmaceuticals, pesticides and so on. The following is the manufacturing method of sodium 5-sulfoisophthalate:
I. Raw materials and equipment
1. Raw materials: isophthalic acid, fuming sulfuric acid, sodium hydroxide.
2. Equipment: reactor, stirrer, condenser, centrifuge, drying equipment and so on.
2. Manufacturing steps
1. Sulfonation reaction of isophthalic acid
Add isophthalic acid and fuming sulfuric acid in the reactor, stir and heat up to a certain temperature to carry out the sulfonation reaction. During the reaction, the temperature and reaction time should be controlled to ensure the reaction is complete. After the reaction, cool to room temperature to get the sulfonated product.
2. Neutralization reaction
The sulfonated product is slowly added into the aqueous solution containing sodium hydroxide, stirred well, and the pH value is controlled in the appropriate range, so that the sulfonated product reacts with sodium hydroxide to form sodium isophthalate-5-sulfonate.
3. Centrifugal separation
The reaction solution is centrifuged and separated to obtain a wet material of sodium 5-sulfoisophthalate.
4. Washing and drying
Wash the wet material with a small amount of water, and then dry it to get the finished product of sodium 5-sulfoisophthalate.
3. Precautions
1. During the sulfonation reaction, the temperature and reaction time need to be strictly controlled to prevent over-sulfonation or the occurrence of side reactions.
2. When neutralization reaction, the pH value should be controlled within the appropriate range to ensure the purity and yield of the product.
3. When centrifugal separation, it is necessary to choose the appropriate centrifuge and operating conditions to improve the separation effect.
4. During drying, drying temperature and time need to be controlled to prevent product deterioration or decomposition. Safety and environmental protection
1. In the production process, it is necessary to strictly abide by the safety operation regulations to ensure the safety of employees and equipment.
2. Effective treatment of waste gas, waste water and solid waste generated, etc. is carried out to ensure that the environmental protection is up to standard.
The above is the manufacturing method of sodium isophthalic acid-5-sulfonic acid, the specific operation process needs to be adjusted and optimized according to the actual production situation.
