分批精馏中的持液作用

分批精馏中持液影响塔内的动态过程 ,因此许多学者一直致力于分批精馏过程中持液作用的研究 ,但由于研究缺乏系统性 ,持液的作用一直是学术上争论的热点 .本文提出用全过程分离难度系数关联各参数对分离过程的影响 ,并建立了分批精馏的恒摩尔持液模型 ,用全过程的分离难度系数研究了分批精馏的持液作用 ,结果表明 :塔顶持液对分离不利 ,但塔身持液在一定条件下增多可使所需回流比降低 ;塔内持液量与釜液量之比为一个因子 ,当q <0 7时 ,确定的分批精馏塔存在最佳投料量 .采用甲苯 乙苯二元物系对最佳投料量进行了实验验证 ,实验结果与模拟结果吻合较好 .

Abatement of Arsenite from Water by Glow Discharge Electrolysis

Glow discharge electrolysis provides an alternative method for the removal of arsenite from water. Glow discharge electrolysis of aqueous solution containing arsenite is studied under altemating current altemating current （50 Hz） discharge. It is found that arsenite [As（III）] get converted to arsenate [As（V）]. The yield is studied with various parameters such as discharge current, duration of discharge and pH （2-10）. The results are interpreted on the basis of interaction of the OH and eaq （produced consequent to the interaction of H2O＋ and e with water at the surface of the solution） with arsenite [As（III）] through the intermediate oxidation state, namely [As（IV）].