运雨桐毕业论文.docVIP

摘 要 本文主要对盐酸改性硅藻土及改性硅藻土处理乙烯废碱液进行了研究。通过单因素实验，考察了硅藻土改性的液固比、改性剂浓度、改性时间及改性温度对硅藻土改性效果的影响趋势及改性硅藻土处理乙烯废碱液的吸附温度、吸附时间、改性硅藻土加入量和乙烯废碱液的pH对乙烯废碱液中硫去除率的影响趋势，确定了硅藻土改性的最佳工艺条件及改性硅藻土处理乙烯废碱液的最佳工艺条件。 硅藻土改性实验结果表明，改性的最佳工艺条件为：液固比为4:1、改性剂浓度为4 mol/L、改性最佳时间为40 min、改性最佳温度为35 ℃。改性硅藻土处理乙烯废碱液的实验结果表明，改性硅藻土处理乙烯废碱液的最佳工艺条件为:吸附时间为40 min、吸附温度为20 ℃、改性硅藻土加入量为1.5 g、乙烯废碱液的pH为3。在此条件下可使20 mL乙mg/L降到29.4 mg/L，硫去除率达94.75%，COD浓度由148000 mg/L降到12000 mg/L，COD去除率达91.89%，达到了预期的效果。改性硅藻土具有比表面积较大、孔隙率较高、吸附性能较强、化学稳定性高、价格低廉等优点，在乙烯废碱液处理方面具有很好的应用前景。 关键词：改性, 硅藻土, 乙烯废碱液, 吸附 Abstract In this paper, hydrochloric acid modified diatomite and modified diatomite ethylene spent caustic treatment have been studied. Through single factor experiment, diatomite modified liquid to solid ratio, modifier concentration, modification time, and modified temperature on diatomite modified effect of trends and modified diatomite processing ethylene spent caustic adsorption temperature, adsorption time, modified diatomite dosage and ethylene spent caustic pH on ethylene spent caustic sulfur removal rate trends are determined, identify the diatomite modified optimum conditions and modified diatomite processing ethylene spent caustic optimum conditions. Diatomite modified experimental results show that the modified optimum conditions: liquid to solid ratio of 4:1, modifier concentration of 4 mol/L, modified best time to 40 min, modified optimum temperature is 35 ℃. Modified Diatomite processing ethylene spent caustic experimental results showed that the modified diatomite processing ethylene spent caustic optimum conditions: adsorption time was 40 min, adsorption temperature is 20 ℃, modified diatomite join amount of 1.5 g, ethylene spent caustic pH 3. Under this condition, make 20 mL of ethylene spent caustic sulfur concentration from 560.4 mg/L down to 29.4 mg/L, sulfur removal rate of 94.75%, COD concentration from 148000 mg/L down to 12000 mg/L, COD removal rate of 91.89%, to achieve the desired effect. Modified Diatomite with large specific s