Sodium acrylate, with the CAS number 7446 - 81 - 3, is a crucial chemical compound in many industrial applications. It is the sodium salt of acrylic acid. Physically, it usually appears as a white or almost colorless powder.
Some key parameters of sodium acrylate include its molecular formula C₃H₃NaO₂, and a molecular weight of approximately 94.04 g/mol. It is highly soluble in water, which makes it very convenient for various aqueous - based applications. The pH value of its aqueous solution is typically around 6 - 9, depending on the concentration.
Sodium acrylate has a wide range of uses in different industries. In the field of water - treatment, it is used as a water - soluble polymer for scale and corrosion inhibition. It can chelate metal ions and prevent the formation of scale in pipes and equipment, thus extending their service life.
In the personal care industry, it is a key ingredient in the production of super - absorbent polymers (SAPs). SAPs are widely used in baby diapers, adult incontinence products, and feminine hygiene products. They can absorb and retain a large amount of liquid, providing excellent dryness and comfort.
In the agricultural sector, sodium acrylate - based polymers can be used as soil conditioners. They can improve the water - holding capacity of the soil, reduce water evaporation, and enhance the survival rate of plants, especially in arid and semi - arid regions.
When using sodium acrylate, it is necessary to follow certain procedures. First, for dissolution, it should be slowly added to water under continuous stirring to ensure uniform dispersion. The stirring speed should be moderate to avoid excessive foaming.
In water - treatment applications, the dosage of sodium acrylate depends on the water quality and the specific requirements of the system. It is usually added at a concentration of several parts per million to tens of parts per million. Before large - scale use, small - scale tests should be carried out to determine the optimal dosage.
In the production of SAPs, sodium acrylate needs to be polymerized with other monomers under specific reaction conditions. This process requires strict control of temperature, reaction time, and the addition of initiators and cross - linking agents.
Case 1: Water - treatment in a power plant. A power plant was facing serious scaling problems in its cooling water system, which affected the heat - exchange efficiency and increased energy consumption. After using sodium acrylate as a scale inhibitor, the formation of scale was significantly reduced. The heat - exchange efficiency was improved by about 15%, and the frequency of equipment maintenance was also greatly reduced, saving a lot of costs.
Case 2: Baby diaper production. A diaper manufacturer used sodium acrylate - based SAPs in its new product line. The diapers showed excellent absorbency. They could absorb up to 30 times their own weight of liquid and keep the surface dry. This led to a significant increase in customer satisfaction and a growth in market share.
Case 3: Agricultural application in a farm. A farm in an arid area applied sodium acrylate - based soil conditioners to its crop fields. The water - holding capacity of the soil increased by about 20%, and the irrigation frequency could be reduced. As a result, the crop yield increased by about 12%, and the quality of the crops also improved.
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