▁▁ ▁Random ▁pack ed ▁columns ▁are ▁used ▁in ▁a ▁variety ▁of ▁applications , ▁including : ▁ ▁Dist ill ation ▁ ▁St ri pping ▁ ▁Car bon ▁dio x ide ▁scr ub bing ▁ ▁Li qu id % E 2 % 8 0 % 9 3 liqu id ▁extra ction ▁ ▁Types ▁ ▁Ras ch ig ▁ring ▁ ▁The ▁Ras ch ig ▁ring ▁is ▁a ▁piece ▁of ▁t ube ▁that ▁is ▁used ▁in ▁large ▁numbers ▁in ▁a ▁pack ing ▁column . ▁Ras ch ig ▁rings ▁are ▁usually ▁made ▁of ▁cer am ic ▁or ▁met als , ▁and ▁they ▁provide ▁a ▁large ▁surface ▁area ▁within ▁the ▁column , ▁allowing ▁for ▁interaction ▁between ▁liquid ▁and ▁gas ▁v ap ors . ▁ ▁Less ing ▁ring ▁ ▁Less ing ▁rings ▁are ▁made ▁of ▁cer am ic ▁and ▁are ▁type ▁of ▁random ▁pack ing ▁which ▁was ▁designed ▁from ▁the ▁Ras ch ig ▁ring . ▁Less ing ▁rings ▁have ▁partitions ▁ins ides ▁which ▁increase ▁the ▁surface ▁area ▁and ▁enh ance ▁mass ▁transfer ▁efficiency . ▁Less ing ▁rings ▁have ▁a ▁high ▁density ▁and ▁an ▁excellent ▁heat ▁and ▁acid ▁resistance . ▁Less ing ▁rings ▁with stand ▁cor ros ion ▁and ▁are ▁used ▁in ▁reg ener ative ▁ox ide ▁systems ▁and ▁transfer ▁systems . ▁ ▁P all ▁ring ▁ ▁P all ▁rings ▁are ▁the ▁most ▁common ▁form ▁of ▁random ▁pack ing . ▁They ▁are ▁similar ▁to ▁Less ing ▁rings ▁and ▁were ▁developed ▁from ▁the ▁Ras ch ig ▁ring . ▁P all ▁rings ▁have ▁similar ▁cyl ind rical ▁dimensions ▁but ▁has ▁rows ▁of ▁windows