【摘要】：阻垢分散劑是工業(yè)循環(huán)水中常用的水處理藥劑。水溶性聚合物阻垢劑因阻垢性能良好、低使用量、少(無)公害以及較好的協(xié)同與溶限效應(yīng),被廣泛用于循環(huán)冷卻水系統(tǒng)。循環(huán)水中聚合物阻垢劑濃度的高低對于系統(tǒng)的正常運(yùn)行具有重要意義。因此需要及時(shí)準(zhǔn)確監(jiān)測循環(huán)水中聚合物阻垢劑的濃度,達(dá)到阻垢且經(jīng)濟(jì)的目的。建立濁度法測定聚合物阻垢劑的濃度,其理論依據(jù)是聚合物能與十二烷基二甲基芐基氯化銨(1227)形成締合物渾濁。利用分光光度計(jì)測定溶液吸光度并通過標(biāo)準(zhǔn)曲線得到聚合物濃度。研究了影響反應(yīng)進(jìn)度的因素,如1227投加量、穩(wěn)定時(shí)間、pH等對吸光度的影響,然后確定最佳測定條件。同時(shí)還討論了循環(huán)水中其他物質(zhì)的存在對聚合物阻垢劑測定的影響及其干擾的消除。得出主要結(jié)論如下：(1)在一定濃度內(nèi),各種聚合物阻垢劑濃度與生成的締合物渾濁液吸光度呈較強(qiáng)的線性關(guān)系。(2)各種聚合物的最佳測定條件：聚丙烯酸(PAA)最佳測定條件：1227濃度250 mg/L,pH為8-9,放置30 min后于410 nm處測吸光度；聚環(huán)氧琥珀酸(PESA)最佳測定條件：1227濃度250 mg/L,pH為9-10,放置30min后于420 nm處測吸光度；羧酸鹽-磺酸鹽-非離子三元共聚物TH-3100最佳測定條件：1227濃度211 mg/L,調(diào)節(jié)溶液pH≈5,穩(wěn)定35min后于520 nm處測吸光度；改性聚羧酸鹽TH-2000最佳測定條件：1227濃度280 mg/L,調(diào)節(jié)溶液pH≈5,穩(wěn)定35 min后于570nm處測吸光度；聚馬來酸酐(HPMA)最佳測定條件：1227濃度105 mg/L,調(diào)節(jié)溶液pH≈4,穩(wěn)定35 min后于410 nm處測吸光度。(3)當(dāng)苯駢三氮唑(BTA)、巰基苯駢噻唑(MBT)、Zn2+4 mg/L,SO42-、 Cl-1000 mg/L,氨基三甲叉膦酸(ATMP)20 mg/L,羥基乙叉二膦酸(HEDP)、 PO43-50 mg/L時(shí),它們的存在對于PESA、TH-3100、TH-2000和HPMA的測定幾乎不產(chǎn)生影響；SO42-、Cl-1000 mg/L,ATMP20mg/L,HEDP、PO43-50mg/L, Zn2+、BTA4mg/L時(shí)對PAA的測定沒有影響；Ca2+、Mg2+對PAA和HPMA的測定不產(chǎn)生影響,然而它們對PESA、TH-3100、TH-2000的影響,可通過添加EDTA二鈉消除,物質(zhì)的量之比至少為1:1(EDTA二鈉：Ca2+或Mg2+)；通過加酸蒸煮將聚磷酸鹽解聚來消除六偏磷酸鈉(SHMP)對這5種聚合物阻垢劑測定的影響。(4)實(shí)際電廠循環(huán)水樣的加標(biāo)回收實(shí)驗(yàn)表明濁度法的現(xiàn)實(shí)可行性,該方法檢測限低,操作簡單且費(fèi)用低,具有很強(qiáng)的應(yīng)用實(shí)際應(yīng)用價(jià)值。
[Abstract]:Scale inhibitor and dispersant is a commonly used water treatment agent in industrial circulating water. The water-soluble polymer scale inhibitor is widely used in circulating cooling water system because of its good scale inhibition performance, low usage, little (no) pollution and good synergistic and dissolving effect. The concentration of polymer scale inhibitor in circulating water is very important for the normal operation of the system. Therefore, it is necessary to monitor the concentration of polymer scale inhibitor in circulating water timely and accurately to achieve the purpose of scale inhibition and economy. A turbidimetric method was established for the determination of the concentration of polymer scale inhibitor. The theoretical basis is that the polymer can form turbidity with dodecyl dimethyl benzyl ammonium chloride (1227). The absorbance of solution was determined by spectrophotometer and the concentration of polymer was obtained by standard curve. The factors influencing the reaction progress, such as the dosage of 1227, the time of stabilization and the pH value, were studied, and the optimum conditions were determined. The influence of other substances in circulating water on the determination of polymer scale inhibitor and the elimination of interference are also discussed. The main conclusions are as follows: (1) within a certain concentration, There was a strong linear relationship between the concentration of various polymer scale inhibitors and the absorbance of the turbid liquid. (2) the optimum conditions for the determination of polyacrylic acid (PAA) were as follows: the pH value of 250mg 路L ~ (-1) O ~ (2 +) was 8-9, and the pH value was 8 ~ 9 at the concentration of min mg 路L ~ (-1). Absorbance at 410 nm; The optimum conditions for the determination of (PESA) were as follows: (1) the concentration of 1: 1227 was 250mg / L ~ (-1) pH was 9-10, and the absorbance was measured at 420nm after 30min was placed. The optimum conditions for the determination of carboxylate sulfonate-nonionic terpolymer TH-3100 were as follows: (1) the concentration of 1: 1227 was 211 mg / L, the pH of the solution was about 5, and the absorbance was measured at 520nm after stabilizing the 35min. The optimum conditions for the determination of modified polycarboxylate TH-2000 were as follows: 1: 1227, 280mg / L, adjusted solution pH 鈮，

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