MgO/γ-Al_2O_3固体碱的混捏法制备、表征及应用

Preparation of MgO/γ-Al_2O_3 by wet-mixing-kneading method and its characterization and application

采用混捏法制备了MgO/γ-Al2O3固体碱,并对其性质进行了测定。研究结果表明,随着活性组分前驱物Mg(OH)2含量的增大,MgO/γ-Al2O3固体碱的碱总量增大,碱量主要分布于3.86 Ho 4.8,且以MgO和Mg(OH)2为前驱物制备的MgO/γ-Al2O3固体碱具有较好的机械强度。固定床脱酸精制试验结果表明,以MgO和Mg(OH)2为前驱物制备的MgO/γ-Al2O3固体碱作为吸附剂具有较好的脱酸性能,当工业氰乙酸乙酯酸值为58.0×10-6,脱酸后产品的酸值低于10×10-6时,处理样品与固体碱吸附剂的体积比可以达到240。采用混捏法制备固体碱具有操作简单,对环境无污染等优点,具有广阔的应用前景。

The MgO/γ-Al2O3 solid bases were prepared by wet-mixing-kneading method, and their properties were characterized. The results show that the total basicity of solid bases increases with the amount of precursor Mg（OH） 2, the basicity is distributed mainly in the range of 3.86≤Ho ≤4.8. The mechanical strength of solid base tablets which was prepared by using MgO and Mg（OH） 2 as precursors is right for industrial applications as adsorbents in purification of the ethyl cyanoacetate. In the adsorption process by fixed bed, the acid value of refined ethyl cyanocaetate is still less than 10 × 10^-6 when the accumulated volume of the refined ethyl cyanocaetate reaches 240 times of the volume of the adsorbent, acid value of un-refined ethyl cyanocaetate is 58.0 × 10^-6. MgO/γ-Al2O3 solid base is simple in preparation and free-pollution to the environment, so it would have wide application in the near future.