The separation of volatile liquid mixtures by continuous gas-liquid chromatography

✍ Scribed by P.E. Barker; D. Critcher

• Publisher: Elsevier Science
• Year: 1960
• Tongue: English
• Weight: 703 KB
• Volume: 13
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(60)80028-0

✦ Synopsis

A process is described for the separation of binary liquid mixtures by a method which is fundamentally the same as extractive distillation but uses a finely divided solid as a carrier for the non-volatile solvent. A non-volatile solvent absorbed on the surface of crushed kieselguhr flows down a column countercurrent to a stream of air. The mixture to be separated is injected continuously as a liquid feed into the mid-point of the column. The flows of gas and solid are adjusted such that one component is carried upwards in the gas stream and the other component downwards absorbed in the non-volatile liquid. Benzene and cyczohexane have heen successfully separated at a rate of 30 cmS/hr in a 1 in. diameter column 4 ft long when using polyoxyethylene 400 di-ricinoleate as the non-volatile solvent. The H.T.U. (height of transfer unit) for this system and column packing was found to be approximately 2 cm.