聚苯胺基复合吸收剂对烟气中SO_2的吸附

Adsorption of sulfur dioxide in flue gas by polyamine based composite absorbent

聚苯胺(PANI)作为吸收剂,可有效地吸附烟气中的SO_2。不同于其他吸收剂的是聚苯胺具有较高的热稳定性。但聚苯胺本身为团聚结构,在脱硫过程中颗粒之间会相互融合,使其脱硫效率降低。采用凹凸棒、硅藻土、蛭石与苯胺复合制备聚苯胺基复合吸收剂,对烟气中的SO_2进行吸附,可有效减少聚苯胺颗粒之间的相互接触,避免聚苯胺颗粒在脱硫过程中颗粒之间的融合。实验结果表明,聚苯胺基复合吸收剂吸附SO_2实质上是其中的聚苯胺对SO_2的吸附,吸附原理主要为化学吸附,当吸附温度为100~180℃时,吸附效果较好;吸附剂可循环使用,且仍然具有优良的吸附容量;相对于纯的聚苯胺,聚苯胺与凹凸棒、硅藻土和蛭石复合之后的吸收剂对SO_2的吸附效果显著提高。

Polyaniline （PANI） as an absorbent can effectively absorb SO2 in flue gas. Unlike other absorbents, polyaniline has high thermal stability. Because of polyaniline＇ s aggregate structure, the particles can mutually fuse in the process of desulfurization, resulting in a decrease in the adsorption efficiency. This study uses polyan- iline composite absorbents that are respectively made of attapulgite, diatomite, vermiculite, and aniline to absorb SOs in flue gas, which can effectively reduce the contact of polyaniline particles with each other and avoid the fu- sion of particles in the process of desulfurization. The experimental results show that the polyaniline composite absorbents can absorb SO2 because of the presence of polyaniline in composite absorbents. The principle of ad- sorption is mainly chemical adsorption. When the temperature of adsorption is 100 - 180 ℃ , the polyaniline had a better effect. The adsorbent can be recycled and maintain its good adsorbing capacity. The composites doped with attapulgite, vermiculite, and diatomite had better excellent adsorption effects for SOs than those of PANI modified with nothing.