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Maleic anhydride (MAH) is hydrolyzed into polymaleic anhydride (HPMA), which is an orange-yellow viscous liquid with a relative density of 1.2 (20°C) and an average molecular weight of about 600. It is acidic, ionizable, and soluble in cold water. This product is non-toxic.
Hydrolyzed polymaleic anhydride is a low molecular weight polyelectrolyte with a relative molecular weight of 400-800. It is non-toxic, easily soluble in water, and has high chemical and thermal stability. The decomposition temperature is above 330°C. At high temperature (<350℃) and high pH, there is obvious solubility limit effect. Hydrolyzed polymaleic anhydride is suitable for use in alkaline water or in combination with other drugs. Hydrolyzed Polymaleic Anhydride still has good scale inhibition and dispersion effect on carbonate below 300℃, and the scale inhibition time can reach 100h. Due to its excellent scale inhibition performance and high temperature resistance, HPMA is widely used in flash distillation units of seawater desalination, low-pressure boilers, steam locomotives, crude oil dehydration, water and oil pipelines and industrial circulating cooling water. In addition, HPMA has a certain corrosion inhibition effect, and the compound effect with zinc salt is better.
Hydrolyzed polymaleic anhydride is usually compounded with organic phosphonates at 1-15ppm. It is used for circulating cooling water, oil field water injection, crude oil dehydration treatment and in-furnace treatment of low-pressure boilers. The rate can reach 98%. When HPMA is compounded with zinc salt, it can effectively prevent the corrosion of carbon steel.
