Langyou Chemical
SUPPLEMENTS
Anionic Polyacrylamide Production
Production of anionic polyacrylamide
1. Introduction
In today's world, the subtlety of chemical technology is related to the prosperity of all industries. Anionic polyacrylamide, in the chemical industry, has great utility. Its production method is also important to the industry. Therefore, it is helpful for the industry to describe its production process and tips in detail.
Second, raw material preparation
To make anionic polyacrylamide, the first choice of raw materials. Acrylamide monomer is its foundation. This monomer must be pure in quality and contain impurities, which must be fine. It is usually obtained by chemical synthesis and refined through multiple processes to achieve the requirements of production. And alkaline substances such as sodium hydroxide or sodium carbonate are also indispensable. These two are involved in the reaction, which is related to the modulation of the ionic characteristics of the product, and the quality and quantity must be precisely controlled.
III. Polymerization
1. ** Initiator system **
The beginning of polymerization depends on the action of the initiator system. Oxidation-reduction initiators are often selected, such as the combination of ammonium persulfate and sodium bisulfite. The combination of the two produces free radicals and promotes the polymerization of acrylamide monomers. The amount of this initiator should be determined according to the size and rate of the reaction. If the amount is large, the reaction will be fast, but the quality of the product may not be sufficient; if the amount is small, the polymerization will be slow and labor-consuming.
2. ** Reaction conditions **
The temperature of the reaction is the key. Generally controlled in a specific domain, often tens of degrees Celsius. High temperature will cause the reaction to be dramatic, which is easy to shorten the molecular chain of the product; low temperature will make polymerization difficult or cause the reaction to stop. And the pH value of the reaction must also be paid attention to. It is appropriate to use an alkaline environment, such as sodium hydroxide to adjust it, so as to ensure the smooth reaction and the combination of product characteristics. During the reaction, stirring should not be ignored. Mixing at a uniform speed and moderately makes the material mix evenly, which is beneficial to the uniformity of the reaction and avoids the appearance of local overheating or overcooling.
4. Post-processing process
1. ** Granulation and drying **
After polymerization, a colloidal product is obtained. After granulation first, it forms a small particle shape, which is conducive to subsequent drying. The method of drying is to use hot air to dry. At a specific temperature and wind speed, remove its moisture. If the temperature is too high, the product may be at risk of degradation; if the temperature is too low, it will be delayed during drying, and the efficiency is low. After drying the product, the amount of water content should meet the standard to ensure the best quality.
2. ** Pulverize and sieve **
Dry particles, or uneven in size. Therefore, the order of pulverization makes the particle size uniform. Then use screening equipment to divide the particle size. Products that do not meet the particle size may be pulverized or treated separately. Qualified products can be bagged and packaged for sale.
Fifth, quality control
1. ** Index detection **
The quality of anionic polyacrylamide depends on various indicators. Its molecular weight is measured by gel permeation chromatography. The appropriate molecular weight is related to its utility in each domain. Charge density is also an important item. Measured by chemical titration and other methods, the value should be consistent with the preset. And solubility, residual monomer content, etc., must be strictly checked. Poor solubility affects use; more residual monomers may be harmful to the environment and people.
2. ** Full-process monitoring **
From the raw material entering the factory to the product leaving the factory, monitoring measures should be set up throughout the process. Inspection of raw materials to ensure their purity; monitoring of reactions, monitoring of temperature, pH and other parameters; control of post-processing, to ensure the combination of particle size and water content. If there is an abnormal situation, adjust it quickly to ensure the quality of the product.
6. Conclusion
The production of anionic polyacrylamide is a systematic project. From raw materials to finished products, all links are interconnected. Only by being careful at all steps, following strict procedures, and being skilled in control can we produce high-quality products. In response to market requirements, we can help the prosperity of the chemical industry.
1. Introduction
In today's world, the subtlety of chemical technology is related to the prosperity of all industries. Anionic polyacrylamide, in the chemical industry, has great utility. Its production method is also important to the industry. Therefore, it is helpful for the industry to describe its production process and tips in detail.
Second, raw material preparation
To make anionic polyacrylamide, the first choice of raw materials. Acrylamide monomer is its foundation. This monomer must be pure in quality and contain impurities, which must be fine. It is usually obtained by chemical synthesis and refined through multiple processes to achieve the requirements of production. And alkaline substances such as sodium hydroxide or sodium carbonate are also indispensable. These two are involved in the reaction, which is related to the modulation of the ionic characteristics of the product, and the quality and quantity must be precisely controlled.
III. Polymerization
1. ** Initiator system **
The beginning of polymerization depends on the action of the initiator system. Oxidation-reduction initiators are often selected, such as the combination of ammonium persulfate and sodium bisulfite. The combination of the two produces free radicals and promotes the polymerization of acrylamide monomers. The amount of this initiator should be determined according to the size and rate of the reaction. If the amount is large, the reaction will be fast, but the quality of the product may not be sufficient; if the amount is small, the polymerization will be slow and labor-consuming.
2. ** Reaction conditions **
The temperature of the reaction is the key. Generally controlled in a specific domain, often tens of degrees Celsius. High temperature will cause the reaction to be dramatic, which is easy to shorten the molecular chain of the product; low temperature will make polymerization difficult or cause the reaction to stop. And the pH value of the reaction must also be paid attention to. It is appropriate to use an alkaline environment, such as sodium hydroxide to adjust it, so as to ensure the smooth reaction and the combination of product characteristics. During the reaction, stirring should not be ignored. Mixing at a uniform speed and moderately makes the material mix evenly, which is beneficial to the uniformity of the reaction and avoids the appearance of local overheating or overcooling.
4. Post-processing process
1. ** Granulation and drying **
After polymerization, a colloidal product is obtained. After granulation first, it forms a small particle shape, which is conducive to subsequent drying. The method of drying is to use hot air to dry. At a specific temperature and wind speed, remove its moisture. If the temperature is too high, the product may be at risk of degradation; if the temperature is too low, it will be delayed during drying, and the efficiency is low. After drying the product, the amount of water content should meet the standard to ensure the best quality.
2. ** Pulverize and sieve **
Dry particles, or uneven in size. Therefore, the order of pulverization makes the particle size uniform. Then use screening equipment to divide the particle size. Products that do not meet the particle size may be pulverized or treated separately. Qualified products can be bagged and packaged for sale.
Fifth, quality control
1. ** Index detection **
The quality of anionic polyacrylamide depends on various indicators. Its molecular weight is measured by gel permeation chromatography. The appropriate molecular weight is related to its utility in each domain. Charge density is also an important item. Measured by chemical titration and other methods, the value should be consistent with the preset. And solubility, residual monomer content, etc., must be strictly checked. Poor solubility affects use; more residual monomers may be harmful to the environment and people.
2. ** Full-process monitoring **
From the raw material entering the factory to the product leaving the factory, monitoring measures should be set up throughout the process. Inspection of raw materials to ensure their purity; monitoring of reactions, monitoring of temperature, pH and other parameters; control of post-processing, to ensure the combination of particle size and water content. If there is an abnormal situation, adjust it quickly to ensure the quality of the product.
6. Conclusion
The production of anionic polyacrylamide is a systematic project. From raw materials to finished products, all links are interconnected. Only by being careful at all steps, following strict procedures, and being skilled in control can we produce high-quality products. In response to market requirements, we can help the prosperity of the chemical industry.
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