Inhibition of Ca3(PO4)2, CaCO3, and CaSO4 Precipitation for Industrial Recycling Water
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- 作者：Fu Change ; Zhou Yuming ; Liu Guangqing ; Huang Jingyi ; Sun Wei ; Wu Wendao
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2011
- 出版时间：September 21, 2011
- 年：2011
- 卷：50
- 期：18
- 页码：10393-10399
- 全文大小：970K
- 年卷期：v.50,no.18(September 21, 2011)
- ISSN：1520-5045
文摘
In an attempt to control Ca3(PO4)2, CaCO3, and CaSO4 deposits in industrial recycling water systems, an acrylic acid (AA)鈥揳llylpolyethoxy carboxylate (APEC) copolymer was examined as a nonphosphorus inhibitor. The synthesized AA鈥揂PEC copolymer was characterized by FT-IR. The performance of AA鈥揂PEC on inhibition of Ca3(PO4)2, CaCO3, and CaSO4 precipitation was compared with that of current commercial inhibitors. It was shown that AA鈥揂PEC exhibited excellent ability to control inorganic minerals, with approximately 82.88% CaSO4 inhibition and 99.89% Ca3(PO4)2 inhibition at levels of 3 and 6 mg/L AA鈥揂PEC, respectively. AA鈥揂PEC also displayed ability to prevent the formation of CaCO3 scales. Transmission electron microscopy (TEM) images indicated that the outstanding performance of AA鈥揂PEC on Ca3(PO4)2 inhibition resulted from a decrease in size of Ca3(PO4)2 solid particles thereby dispersing these particles throughout a fluid, while CaCO3 inhibition was attributed to the formation of ribbon-shaped structures and CaSO4 inhibition resulted from loose CaSO4 crystallites speculated on scanning electron microscopy (SEM) images. The proposed inhibition mechanism suggests the formation of complexes between the side-chain carboxyl groups of AA鈥揂PEC and calcium ions on the surface of inorganic minerals, and the excellent solubility of complexes resulted from a number of hydrophilic polyethylene glycol (PEG) segments.