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              化工原料水分儀

              文章出處:未知人氣: 186 發布時間:2019-03-04 11:26

                化工原料水分儀具有專一性,操作簡單等優點,普遍用于工業生產的在線控制分析,工農業產品的質量簽定等。經典水分分析方法已逐漸被各種水分分析方法所代替,目前市場上主要存在的水分測定儀主要有卡爾·費休水分測定儀、紅外水分測定儀、露點水分測定儀、微波水分測定儀、庫侖水分測定儀,以及一些專用化工原料水分儀。

              化工原料水分儀

                在水存在時,即樣品中的水與卡爾費休試劑中的SO2與I2產生氧化還原反應。H2SO4但這個反應是個可逆反應,當硫酸濃度達到0.05%以上時,即能發生逆反應。如果我們讓反應按照一個正方向進行,需要加入適當的堿性物質以中和反應過程中生成的酸。經實驗證明,在體系中加入吡啶,這樣就可使反應向右進行。

                生成硫酸酐吡啶不穩定,能與水發生反應,消耗一部分水而干擾測定,為了使它穩定,我們可加無水甲醇。硫酸酐吡啶CH3OH(無水)→甲基硫酸吡啶,我們把這上面三步反應寫成總反應式為:I2 SO2 H2O 3吡啶 CH3OH → 2氫碘酸吡啶 甲基硫酸吡啶

                從反應式可以看出1mol水需要1mol碘,1mol二氧化硫和3mol吡啶及1mol甲醇而產生2mol氫碘酸吡啶、1mol甲基硫酸吡啶。這是理論上的數據,但實際上,SO2、吡啶、CH3OH的用量都是過量的,反應完畢后多余的游離碘呈現紅棕色,即可確定為到達終點。

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