以下为句子列表:
英文: By increasing the column trays in the first and second of extractive rectification column, the purity of butadiene increased from 99.0% to 99.5%, the content of alkynes decreased from 140×10^(-6) to 25×10^(-6), the content of butadiene in the C4 raffinate
中文: 摘要通过增加丁二烯生产装置中第一、第二萃取精馏塔塔板数,使得成品丁二烯纯度由改造前的99.0%提高到99.5%以上,炔烃质量分数由140×10^(-6)降低到25×10^(-6)以下,抽余碳四中丁二烯质量分数由0.3%~0.8%降低到0.004%以下。
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