Hydrolyzed Polymaleic Anhydride
Hydrolyzed Polymaleic Anhydride (HPMA), with the CAS number 26099-09-2, is a polycarboxylic acid-type organic compound that is known for its high-temperature resistance and its ability to chelate calcium, magnesium, and iron ions present in water. Here are some key points about HPMA Chemical Properties: HPMA is a low molecular weight polymer that is easily soluble in water. It has a high density of carboxylic acid groups that can chelate metal ions, making it an effective dispersant and scale inhibitor.
Applications: It is widely used as a green water treatment agent, particularly in high-temperature, high pH, high alkalinity, and high hardness conditions. HPMA is highly effective against scale formation from calcium carbonate and calcium sulfate, outperforming other organic co-polymer dispersants.
Environmental and Safety Considerations: It has low toxicity and is non-carcinogenic and non-teratogenic, making it suitable for use in systems such as circulating cooling water, low-pressure boiler water treatment, and in oilfield water injection and crude oil dehydration processes.
Physical Properties: At room temperature, HPMA is a brownish-red viscous liquid with a solid content of 50%, a relative density of 1.20 at 20/20°C, and an acid value of 280-320 mg KOH per kilogram.
Molecular Characteristics: The molecular weight of HPMA ranges from 400 to 700, and it has a pH value of 1-2. Each carbon atom in the polymer chain carries a high potential charge, distinguishing its polyelectrolyte properties from those of polyacrylic acid or polymethacrylic acid.
Synthesis: HPMA is synthesized through the polymerization and hydrolysis or hydrolytic polymerization of maleic anhydride.
Titrability: When titrating with bases such as LiOH, NaOH, KOH, or (CH3)4NOH, only half of the total acid’s carboxyl groups are neutralized, indicating that HPMA behaves differently from polyacrylic acid or polymethacrylic acid in titration
Copolymer of Maleic and Acrylic Acid
Sodium Salt of Polyaspartic Acid
HPMA is recognized for its effectiveness in preventing scale formation and is considered an environmental
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