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Hydrolyzed polymaleic anhydride is the homopolymer of maleic acid.
Hydrolyzed polymaleic anhydride is very stable in presence of chlorine and other oxidizing biocides.
Hydrolyzed polymaleic anhydride has good scale inhibition and high temperature resistance properties.
CAS: 26099-09-2
MF: C4H4O4
MW: 116.07
EINECS: 607-861-7
Synonyms
POLY(MALEIC ACID);(z)-2-butenedioic acid homopolymer;poly(maleicacid)(50%aq);MALEIC ACID POLYMER;hydrolyzed polymaleic anhydride;Hydrolysed Polymaleic Anhydride;PolymaleicacidAq;Maleic Acdi ( homopolymer )
Therefore, Hydrolyzed polymaleic anhydride can be used in the water desalination plants.
Hydrolyzed polymaleic anhydride is also an excellent calcium carbonate antiscalant upon high temperature and in the high alkaline cooling water systems.
In addition, Hydrolyzed polymaleic anhydride can be used in combination with zinc salts as a corrosion inhibitor.
Hydrolyzed polymaleic anhydride can also be used as concrete additive and for crude oil evaporation.
Hydrolyzed polymaleic anhydride can be manufactured through the polymerization of maleic anhydride I an aromatic hydrocarbon upon 60° to 200° C.
Hydrolyzed polymaleic anhydride is the product of partial hydrolysis of polymaleic anhydride.
Hydrolyzed polymaleic anhydride has been determined that about 60% to 70% of the polymaleic anhydride is hydrolyzed to a carboxylic acid.
That is not completely hydrolyzed.
Hydrolyzed polymaleic anhydride is a polycarboxylic acid type organic compound, which is resistant to high temperature and can chelate calcium, magnesium, iron, etc. in water.
Good thermal stability, use PH range, wide water hardness, is an excellent scale inhibitor.
Hydrolyzed polymaleic anhydride (HPMA), as a low-cost and excellent green water treatment agent, has become an important member of high-efficiency water-soluble scale inhibitor and dispersant.
Especially under harsh environmental conditions such as high temperature, high pH value, high alkalinity, high hardness, etc., hydrolyzed polymaleic anhydride has a significant scale inhibition effect on calcium carbonate, calcium sulfate, etc., which is not general polypropylene acids and other organic copolymerization The dispersant can reach.
At the same time, Hydrolyzed polymaleic anhydride has low toxicity, no carcinogenic and teratogenic effects, and is often used as a water treatment agent for circulating cooling water, low-pressure boiler water, and anti-scaling treatment for oilfield water injection, crude oil dehydration and other systems.
Hydrolyzed polymaleic anhydride Chemical Properties
Density: 1.18 (48% aq.)
Fp: 95 °C
Storage temp.: 2-8°C
Solubility: Methanol (Sparingly), Water (Soluble)
Form: Pale Yellow to Yellow Solution
Odor: Slight
InChI: InChI=1S/C4H4O4/c5-3(6)1-2-4(7)8/h1-2H,(H,5,6)(H,7,8)/b2-1-
InChIKey: VZCYOOQTPOCHFL-UPHRSURJSA-N
EPA Substance Registry System: Hydrolyzed polymaleic anhydride (26099-09-2)
Hydrolyzed polymaleic anhydride is a low molecular weight polymeride, with average molecular weight 400-800.
No toxicity, soluble in water, high chemical and thermal stability, decomposed temperature above 330℃.
Hydrolyzed polymaleic anhydride has obvious threshold effect under high temperature (350℃) and high pH（8.3）level, suitable to be used in alkaline water system or built with agents.
Hydrolyzed polymaleic anhydride has good scale inhibition against carbonate and phosphate scales under temperature 300℃ with effective time as long as 100 hours.
Due to its good scale inhibition and high temperature tolerance properties, Hydrolyzed polymaleic anhydride is widely used in desalination plant of flash vaporization equipment, low pressure boiler, steam locomotive, crude oil evaporation, petroleum pipeline, and industrial circulating cool water systems.
In addition, Hydrolyzed polymaleic anhydride has good corrosion inhibition effect when used together with zinc salt.
HPMA can also used as additives for cement.
Uses
Hydrolyzed polymaleic anhydride is usually used together with organic phosphonate at dosage of 1-15ppm for circulating cool water system, oilfield fill water, crude oil dewatering and low-pressure boilers.
Hydrolyzed polymaleic anhydride has good scale inhibition (98%) and scale stripping properties.
When used together with zinc salts, Hydrolyzed polymaleic anhydride can effectively inhibit carbon steel corrosion.
Hydrolyzed polymaleic anhydride is usually used with organic phosphonate at 1~15 ppm for circulating cool water systems, oilfield fill water, crude oil dewatering, and low-pressure boilers.
Hydrolyzed polymaleic anhydride has good scale inhibition (98%) and scale stripping properties.
Combined with zinc salts, Hydrolyzed polymaleic anhydride can effectively inhibit carbon steel corrosion.
Hydrolyzed polymaleic anhydride can be used as a dispersing agent for inorganic pigments to increase the fineness of inorganic pigments.
Hydrolyzed polymaleic anhydride has high chemical stability and temperature resistance, and has obvious solubility limit effect when pH value is 8.3.
Hydrolyzed polymaleic anhydride can chelate calcium and magnesium plasma in water and has lattice distortion ability, which can improve the fluidity of sludge.
Hydrolyzed polymaleic anhydride is especially suitable for scale inhibition in high-temperature water systems such as boiler water.
Can be used as oil field water pipeline, circulating cooling water system and flash seawater desalination and other sediment inhibitors, scale inhibitors, etc., can also be used as a basic industrial detergent.
Mainly used in low-pressure boilers, industrial circulating cooling water systems, oil pipeline, crude oil dehydration and flash seawater desalination and other aspects of the scale inhibitor, and can be used as the main component of advanced cleaning agents, but also can be used as textile rinsing agent, reduces the ash content of textiles.
Hydrolyzed polymaleic anhydride still has good scale inhibition and dispersion effect on carbonate below 300 ℃, and the scale inhibition time can reach COOH.
Due to the excellent scale inhibition performance and high temperature resistance of Hydrolyzed polymaleic anhydride, it is widely used in the flash unit of seawater desalination and in the low pressure boiler, steam locomotive, crude oil dehydration, water transfer pipeline and industrial circulating cooling water.
In addition, Hydrolyzed polymaleic anhydride has a certain corrosion inhibition effect, and the effect of compound with zinc salt is better, which can effectively prevent the corrosion of carbon steel.
Hydrolyzed polymaleic anhydride is usually (1~15)× 10-6 and organic phosphate compound, for circulating cooling water, oil field water injection, crude oil dehydration treatment and low pressure boiler furnace treatment, it has a good effect of inhibiting scale formation and stripping old scale, and the scale inhibition rate can reach 98%.
Biological Activity
Hydrolyzed polymaleic anhydride forms nanodiscs spontaneously by fragmentation or solubilization of the lipid bilayers.
Hydrolyzed polymaleic anhydride is used in designing of nanodisc-forming polymer to mimic the amphiphilic nature of proteins and peptides.
Hydrolyzed polymaleic anhydride N-C4-60-4.7 efficiently solubilised the lipid membrane and forms lipid nanodiscs with 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC).
The addition of Hydrolyzed polymaleic anhydride N-C4-60-4.7 lowered the light scattering intensity of Escherichia coli suspension.
Synthesis Method
Hydrolyzed polymaleic anhydride add a certain amount of maleic anhydride and water to a 1000m four-mouth flask equipped with thermometer, stirrer, reflux condenser and constant pressure drop funnel, and raise the temperature to 60 ℃.
After the maleic anhydride is completely dissolved, add an appropriate amount of catalyst and self-made auxiliary AXL, start the stirrer and raise the temperature to the set temperature at the same time, control a certain reaction temperature, and add the initiator within a certain period of time through a constant pressure drop funnel.
After dropping, continue the heat preservation reaction for 2h to obtain Hydrolyzed polymaleic anhydride products.
