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蒸發(fā)儀器使用詳細(xì)介紹

更新時(shí)間:2012-05-08點(diǎn)擊次數(shù):8264
蒸發(fā)儀器使用詳細(xì)介紹
  蒸發(fā)儀器蒸發(fā)皿蒸發(fā)皿為一陶瓷淺底的圓碟狀容器。為一陶瓷淺底的圓碟狀容器。當(dāng)欲由溶液中得到固體時(shí),常需以加熱的方法趕走溶劑,此時(shí)就要用到蒸發(fā)皿。當(dāng)欲由溶液中得到固體時(shí),常需以加熱的方法趕走溶劑,此時(shí)就要用到蒸發(fā)皿。溶劑蒸發(fā)的速率愈快,它的結(jié)晶顆粒就愈小。溶劑蒸發(fā)的速率愈快,它的結(jié)晶顆粒就愈小。視所需蒸發(fā)速率的快慢不同,可以選用直接將蒸發(fā)皿放在火焰上加熱的快速蒸發(fā)、用水浴加熱的較和緩的蒸發(fā)或是令其在室溫的狀態(tài)下慢慢地蒸發(fā)三種方式。視所需蒸發(fā)速率的快慢不同,可以選用直接將蒸發(fā)皿放在火焰上加熱的快速蒸發(fā)、用水浴加熱的較和緩的蒸發(fā)或是令其在室溫的狀態(tài)下慢慢地蒸發(fā)三種方式。
  一般在實(shí)驗(yàn)室中要純化固體時(shí),都要以再結(jié)晶的方法來(lái)使固體的純度增加。一般在實(shí)驗(yàn)室中要純化固體時(shí),都要以再結(jié)晶的方法來(lái)使固體的純度增加。再結(jié)晶的方法通常為選取適當(dāng)?shù)娜軇共患兾镏械碾s質(zhì)在此溶劑中具有難溶或不溶的特性,而欲純化的成分則在此溶劑中有相當(dāng)好的溶解度。再結(jié)晶的方法通常為選取適當(dāng)?shù)娜軇?,使不純物中的雜質(zhì)在此溶劑中具有難溶或不溶的特性,而欲純化的成分則在此溶劑中有相當(dāng)好的溶解度。先將欲純化的固體以zui少量的熱溶劑溶解,此時(shí)若有不溶的雜質(zhì),則應(yīng)立即將溶液在此溫?zé)岬臓顩r下過(guò)濾;如此即可將不溶的固體雜質(zhì)藉過(guò)濾留在濾紙上;濾下的濾液中主成分的純度即可增加,再將濾液倒入蒸發(fā)皿中令其結(jié)晶,得到的晶體即為純度增高的物質(zhì)。先將欲純化的固體以zui少量的熱溶劑溶解,此時(shí)若有不溶的雜質(zhì),則應(yīng)立即將溶液在此溫?zé)岬臓顩r下過(guò)濾;如此即可將不溶的固體雜質(zhì)借過(guò)濾留在濾紙上;濾下的濾液中主成分的純度即可增加,再將濾液倒入蒸發(fā)皿中令其結(jié)晶,得到的晶體即為純度增高的物質(zhì)。
  

公司主要經(jīng)營(yíng):濃縮儀,溶劑蒸發(fā),制備色譜,凍干機(jī)

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