Mengwei Xue

Preparation and application of a phosphorous free and non-nitrogen scale inhibitor in industrial cooling water systems

A novel environmentally friendly type of calcium carbonate, zinc (II) and iron (III) scale inhibitor Acrylic acidallylpolyethoxy carboxylate copolymer (AAAPEL) was synthesized. The anti-scale property of the AA-APEL toward CaCO3, zinc (II) and iron (III) in the artificial cooling water was studied through static scale inhibition tests. The observation shows that both calcium carbonate, zinc (II) and iron (III) inhibition increase with increasing the dosage of AA-APEL. The effect on formation of CaCO3 was investigated with combination of scanning electronic microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) analysis and fourier transform infrared spectrometer, respectively. The results showed that the AA-APEL copolymer not only influenced calcium carbonate crystal morphology and crystal size but also the crystallinity. The crystallization of CaCO3 in the absence of inhibitor was rhombohedral calcite crystal, whereas a mixture of calcite with vaterite crystals was found in the presence of the AAAPEL copolymer. Inhibition mechanism is proposed that the interactions between calcium or iron ions and polyethylene glycol (PEG) are the fundamental impetus to restrain the formation of the scale in cooling water systems.

Linear-dendritic block copolymers as a green scale inhibitor for calcium carbonate in cooling water systems

Abstract Water-soluble monomer APEG-PG-(OH)n were produced and the Structure of APEG-PG-(OH)5 were identified by 1H-NMR. APEG-PG-(OH)n were copolymerized with maleic anhydride (MA) to synthesize no phosphate and nitrogen free calcium carbonate inhibitor MA/APEG-PG-(OH)n. The structure and thermal property of MA/APEG-PG-(OH)5 were characterized and measured by 1H-NMR, GPC and TGA. The observation shows that the dosage and n value of MA/APEG-PG-(OH)n plays an important role on CaCO3 inhibition. MA/APEG-PG-(OH)5 displays superior ability to inhibit the precipitation of calcium carbonate, with approximately 97% inhibition at a level of 8 mg/L. The effect on formation of CaCO3 was investigated with combination of SEM and XRD analysis.

Acrylic acid–allylpolyethoxy carboxylate copolymer as a environmentally friendly scale inhibitor (part II)

A novel environmentally friendly type of scale inhibitor acrylic acid–allylpolyethoxy carboxylate (AQn) was synthesized. The antiscale property of the AQn copolymer towards Ca3(PO4)2 in the artificial cooling water was studied through static scale inhibition tests, The observation shows that Ca3(PO4)2 inhibition increases with increasing the degree of polymerization of AQn from 5 to 15, and the dosage of AQn plays an important role on Ca3(PO4)2 inhibition. The effect on the formation of Ca3(PO4)2 was investigated with combination of scanning electronic microscopy, transmission electron microscopy, X-ray powder diffraction analysis, respectively. Inhibition mechanism is proposed that the interactions between calcium ions and polyethylene glycol are the fundamental impetus to restrain the formation of the scale in cooling water systems.

Fluorescent-tagged block copolymer as an effective and green inhibitor for calcium sulfate scales

Allyloxy polyethoxy ether (APEG) and succinic anhydride were used to prepare allyloxy polyethoxy carboxylate (APEL). 8-Hydroxy-1,3,6-pyrene trisulfonic acid trisodium salt (PY) was reacted with allyl chloride to produce fluorescent monomer 8-allyloxy-1,3,6-pyrene trisulfonic acid trisodium salt (PA). APEL and PA were copolymerized with maleic anhydride (MA) to synthesize PA tagged no phosphate and nitrogen free CaSO4 inhibitor MA–APEL–PA. Structures of PA, APEG, APEL, and MA–APEL–PA were identified by 1H NMR. The observation shows that the dosage of MA–APEL–PA plays an important role on CaSO4 inhibition. The effect on formation of CaSO4 was investigated with scanning electron microscope (SEM) analysis. Relationship between MA–APEL–PA’s fluorescent intensity and its dosage was studied. Correlation coefficient R2 of MA–APEL–PA fluorescent intensity and MA–APEL–PA dosage is 0.9991.

Acrylic Acid-Allylpolyethoxy Carboxylate Copolymer: An Effective and Environmentally Friendly Inhibitor for Carbonate and Sulphate Scales in Cooling Water Systems

Formation of mineral scales of carbonate and sulphate poses significant problems in cooling water systems. For the control of calcium carbonate and calcium sulphate scales, a novel environmentally friendly type of scale inhibitor ALn was synthesized. The antiscale property of the ALn copolymer towards CaCO3 and CaSO4 in the artificial cooling water was studied through static scale inhibition tests, The observation shows that both CaCO3 and CaSO4 inhibition increase with increasing the degree of polymerization of ALn from 5 to 15, and the dosage of ALn plays an important role on CaCO3 and CaSO4 inhibition. The effect on formation of CaCO3 and CaSO4 was investigated with combination of scanning electronic microscopy, transmission electron microscopy, and X-ray powder diffraction analysis, respectively. Inhibition mechanism is proposed that the interactions between calcium and polyethylene glycol are the fundamental impetus to restrain the formation of the scale in cooling water systems.

Linear-Dendritic Block Copolymer Containing Fluorescent Groups: An Effective and Environmentally Benign Inhibitor for Calcium Carbonate

Abstract A novel fluorescent-tagged scale inhibitor, the linear-dendritic double hydrophilic block copolymer [acrylic acid (AA)/allyloxy poly(ethylene glycol) polyglycerol (APEG-PG-(OH)n)/8-allyloxy-1,3,6-pyrene trisulfonic acid trisodium salt (PA) (AA/APEG-PG-(OH)n/PA)] was synthesized by polymerisation of AA, APEG-PG-(OH)n and PA. Structures of APEG, APEG-PG-(OH)n and AA/APEG-PG-(OH)n/PA were determined by 1HNMR. The experiments show that the dosage and the n value of AA/APEG-PG-(OH)n/PA play an important role on CaCO3 inhibition. The polymer AA/APEG-PG-(OH)5/PA displays a 90% inhibition of CaCO3 precipitate formation at a dosage of 8 mg/L. The relationship between the fluorescent intensity of AA/APEG-PG-(OH)5/PA and the dosage of this polymer was studied. The correlation coefficient R of AA/APEG-PG-(OH)5/PAs is 0.9995. The effect on formation of CaCO3 was investigated with combination of XRD and SEM analysis. Finally, the significant cause and mechanism for calcium carbonate inhibition were analysed in depth.

Maleic anhydride–allylpolyethoxy carboxylate copolymer as an effective and environmentally benign inhibitor for calcium carbonate in industrial cooling systems

For the control of calcium carbonate scales, a novel environmentally friendly type of scale inhibitor MLn was synthesized. The structure and thermal property of ML15 were characterized and measured by FT-IR, 1H-NMR, TGA and GPC. The anti-scale property of the MLn copolymer towards CaCO3 in the artificial cooling water was studied through static scale inhibition tests, the observation shows that CaCO3 inhibition increase with increasing the degree of polymerization of MLn from 5 to 15, and the dosage of MLn plays an important role on CaCO3 inhibition. The effect on formation of CaCO3 was investigated with combination of scanning electronic microscopy (SEM) and X-ray powder diffraction (XRD) analysis. Inhibition mechanism is proposed that the interactions between calcium and polyethylene glycol (PEG) are the fundamental impetus to restrain the formation of the scale in cooling water systems.

Carboxylate-Terminated Double-Hydrophilic Block Copolymer as an Effective Inhibitor for Carbonate and Sulphate Scales

Abstract For the control of carbonate and sulphate scales, a new type of green scale inhibitors AQn was synthesized. The thermal stability and the molecular weight of the copolymers were investigated by thermal gravimetric analysis and gel permeation chromatography, respectively. The anti-scale property of the AQn copolymers towards CaCO3 and CaSO4 in the artificial cooling water was studied through static scale inhibition tests. The results show that both CaCO3 and CaSO4 inhibition increase with increasing the degree of polymerization of AQn from 5 to 15. The dosage of AQn plays also an important role on CaCO3 and CaSO4 inhibition. Surface morphology characterization of CaCO3 and CaSO4 was investigated with combination of scanning electronic microscopy (SEM), transmission electron microscopy (TEM) and X-ray powder diffraction (XRD) analysis. An inhibition mechanism is proposed that the interactions between calcium and polyethylene glycol (PEG) are the fundamental impetus to restrain the formation of the scale in cooling water systems.