单词：fractional column
fractional column的用法和样例：
例句
- The liquid drawn off from the bottom of the first fractionating column, the primary fractionating column, is fractionated again in another column under low pressure.从第一个分馏塔即初分塔底部下来的液体，再在低压下进入其余的分馏塔分馏。
- Water wash injections, typically continuous and low volume, are used to avoid salt build-up or reduce corrosiveness in the distillation column overheads.水洗水注入设施，典型的是连续小量，避免结盐或减缓分馏塔顶的腐蚀。
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