The column of reactive distillation was improved from compound tower to sieve tray tower which is famous for its lower cost of equipment and simpler operation and cleaning.
反应精馏塔由原来的复合型塔改为单纯筛板塔，操作清洗简单、设备费用低。
2
The procedure was described, including extraction by acetone and dichloromethane, cleaning up by passing through a column made up of neutral alumina and active carbon, determination by GC with NPD.
样本用丙酮提取，加二氯甲烷萃取，通过中性氧化铝和活性炭混合柱层析净化，然后上气相色谱用NPD检测。
3
We are cleaning up the data and we have discovered the name column is full of similar names that represent the same company.