Selectivity and efficiency enhancement of supercritical fluid extraction by application of reactive additives. I. The analysis of calcium montanate using citric acid as a complexing agent
✍ Scribed by Venema, Arnold ;Jelink, Theo J.
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- English
- Weight
- 212 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0935-6304
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
It has been demonstrated that calcium montanate (a mixture of aliphatic hydrocarbons, fatty acid esters of C~28~–C~32~ acids, the calcium salts of these fatty acids, and the acids themselves) can be selectively extracted with supercritical fluids. By use of carbon dioxide, carbon dioxide containing 10% methanol, and carbon dioxide containing 10% methanol and citric acid (as a further additive), the various compound classes could be isolated with high selectivity. The addition of citric acid results in the complexation of Ca^2+^ and the simultaneous formation of the free fatty acids, which are soluble in the extractant.