【作者】 郭伟；

【导师】 马红钦；

【作者基本信息】 天津大学 ， 化学工程， 2007， 硕士

【摘要】 SO₄^2-是化工行业中常见的阴离子,它的存在往往给化工生产带来巨大危害,在制盐、氯碱、纯碱等基本化学工业中必须设法将SO₄^2-脱除。吸附-脱附法是一种有效的SO₄^2-脱除方法,其中以锆系吸附剂为基础的吸附-脱附法有望取代传统的SO₄^2-脱除方法,从而实现基本化学工业的技术升级。采用晶种沉淀法,以ZrOCl₂·2H₂O、γ–Al₂O₃和氨水为原料,制备包裹型氢氧化锆复合粉末。采用TEM、IR及Zeta电位等测试手段对制备工艺进行研究,结果表明:共沸蒸馏是经济有效的干燥方式,ZrOCl₂溶液浓度不宜超过0.6mol/L,适宜的Zr/Al摩尔比约为4。采用浸渍法,以ZrOCl₂·2H₂O和氨基膦酸树脂D418为原料,制备大孔螯合树脂D418负载的氯氧化锆,考察了浸渍时间、pH、温度对负载量的影响,得出适宜的操作条件为:室温,pH=5,浸渍时间为16小时。采用重量分析法,对以上两种样品吸附SO₄^2-的行为进行研究,主要考察温度、pH、SO₄^2-浓度、Cl-浓度等条件对吸附性能的影响,以及NaOH溶液再生剂的再生效果。结果表明:采用晶种沉淀法制得的包裹型氢氧化锆复合粉末对SO₄^2-有较高的脱除效率;随SO₄^2-浓度的提高,SO₄^2-脱除率降低,SO₄^2-吸附量基本不变;适宜的吸附温度为室温,适宜的pH为3;溶液中Cl^-的引入可以提高SO₄^2-的脱除率;NaOH溶液能有效使吸附剂得到再生,适宜的NaOH溶液浓度为25g/L。更多还原

【Abstract】 SO₄^2-（Sulfate radical）, a common anion in inorganic chemical industry, can result in a bad impact on the production of several basic chemical materials,SO₄^2- must be removed in the basic chemical industry of salt making, chlor-alkali and soda ash. Among the methods of SO₄^2- removing, sorption-desorption is an efficient one. The method of sorption-desorption, which with the sorbent based on zirconium, is expected to replace the traditional methods of SO₄^2- removing, thereby the technologic upgrade of the basic chemical industry is realized.Using ZrOCl₂·2H₂O,γ–Al₂O₃ and ammonia as materials, ZrO（OH）2-coatedγ–Al₂O₃ was prepared with the method of precipitation. By employing the test methods of IR, TEM, Zeta potential, etc, the technology of preparation was investigated. The experimental results indicate that, azeotropic distillation drying is an economic and efficient way, concentration of ZrOCl₂·2H₂O should be less than 0.6mol/L, and appropriate ratio of zirconium to aluminium is about 4.Using the method of macerating, ZrOCl₂ loading on D418 was produced. Influence including time of macerating, pH, and temperature on the amount of load was studied. The proper conditions show that, room temperature is appropriate, the suitable pH is equal to 5, and time of macerating is 16 hours.Using the gravimetric method, property of SO₄^2- sorption on the two products was studied. Factors including temperature, pH, concentration of SO₄^2- and Cl- have impact on the result of SO₄^2- removing. Desorption result of ZrO（OH）2-coatedγ–Al₂O₃ with NaOH was investigated. The results showed that ZrO（OH）2-coatedγ–Al₂O₃ has the higher percentage of sorption. The percentage of adsorption will decrease with the increase of SO₄^2- concentration, and the amount of sorption is unchanged. The room temperature is proper, the suitable pH is equal to 3.The addition of Cl^- will increase the percentage of sorption, and NaOH with the concentration of 25g/L is a good choice for the regeneration of sorbent.更多还原