Acid Gas Extraction of Pyridine from Water

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• 作者：Antero Laitinen and Juha Kaunisto
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2000
• 出版时间：January 2000
• 年：2000
• 卷：39
• 期：1
• 页码：168 - 174
• 全文大小：70K
• 年卷期：v.39,no.1(January 2000)
• ISSN：1520-5045

文摘

Pyridine was extracted from aqueous solutions initially containing 5 or 15 wt % pyridine byusing liquid or supercritical carbon dioxide at 10 MPa as a solvent in a mechanically agitatedcountercurrent extraction column. The lowest pyridine concentration in the raffinate was 0.06wt %, whereas the pyridine concentration in the extract was 86-94 wt %. From the initial amountof pyridine, 96-99% was transferred from the feed stream to the extract by using relativelysmall solvent-to-feed ratios of 2.8-4.6 (kg of solvent/kg of feed). The measured distributioncoefficients for the water/pyridine/carbon dioxide system ranged from 0.3 to 1 (weight units),depending on the initial pyridine concentration in water. Carbon dioxide is a particularly suitablesolvent for the extraction of pyridine from concentrated aqueous solutions. The efficiency maybe the result of an acid-base interaction between weakly basic pyridine solute and weakly acidiccarbon dioxide solvent in an aqueous environment.