“一步法”HEDP的中试合成、复配及现场应用研究

Study on "one-step" HEDP pilot synthesis, compound and field application

摘要:

以工业级乙酰氯、亚磷酸、正丁醇为原料，“一步法”在50L工业反应釜中合成HEDP，并将其与硫酸锌、钼酸钠、葡萄糖酸钠复配制备一种复配型低磷水处理药剂HDW-2，在其阻垢、缓蚀性能的基础上，建立了HDW-2药剂浓度与缓蚀阻垢率的线性关系模型，并于山东省某企业进行为期1个月的现场试用。结果表明：当投加量为15 mg/L，即维持PO43-浓度为2.02 mg/L时，阻垢率达到了96.3%；当投加量为64 mg/L，即维持PO43-浓度为8.49 mg/L时，缓蚀率达到了95.2%，腐蚀速率仅为0.028 mm/a。HDW-2在循环水系统中被吸附遵循Langmuir等温吸附模型，以此建立以阻垢为主的加药模型为 ，以缓蚀为主的加药模型为 。现场试应用1个月的跟踪监测数据显示，系统运行稳定，循环水的pH保持在8.07-8.57之间，电导率保持在1950-2690 μs/cm之间，钙硬度保持 总碱度保持在892-1080 mg/L，氯离子保持在183-287 mg/L之间，总Fe保持在0.12-0.32 mg/L之间，腐蚀速率小于0.04 mm/a，总磷（以PO43-计）保持在3.37-7.55 mg/L之间。各项水质指标均达到了甲方考核指标的要求，因而本研究开发的水处理药剂HDW-2具有一定的工业应用价值和市场前景。

Abstract:

HEDP was synthesized in medium-test (50L) by one-step reaction with industrial grade acetyl chloride, phosphorous acid and n-butyl alcohol. Then, a low phosphorus water treatment agent HDW-2 was obtained by combining HEDP with zinc sulfate, sodium molybdate, sodium gluconate. On the basis of its scale and corrosion inhibition properties, a linear relationship model between HDW-2 dosage and scale and corrosion inhibitor rate was set, and trial on site for a period of one month in some enterprises in shandong province. The results showed that the scale inhibiting rate was up to 96.3% when the dosage of HEDP was 15 mg/L(equal to 2.02 mg/L PO43-) and the corrosion inhibiting rate was 95.2%, the corrosion rate was only 0.028 mm/a when the dosage of HEDP was 64 mg/L(equal to 8.49 mg/L PO43-). Adsorption law of HDW-2 followed the Langmuir isotherm adsorption model, based on it the dosing models (for anti-scaling) and (for anti-corrosion) were set. After a month of field test application, it showed that the system run stability, pH was maintained between 8.07-8.57, electrical conductivity was maintained between 1950-2690 μs/cm, calcium hardness total alkalinity was maintained between 892-1080 mg/L, chloride ion was maintained between 183-287 mg/L, total Fe was maintained between 0.12-0.32 mg/L, the corrosion rate <0.04 mm/a, total phosphorus (PO43-) was maintained between 3.37-7.55 mg/L. The water quality indicators had reached the requirement of party a's assessment indicators, thus the water treatment reagents HDW-2 has a certain market prospect and value for industrial application.