Preparation of Silver-based Deep Eutectic Solvents and Their Application in Separation of Long-chain Olefins/Alkanes
Deep eutectic solvents(DESs)have the advantages of simple preparation,low price,and low toxicity.They have been widely used in azeotrope separation,but are rarely used in the separation of long-chain α-olefins.Based on the complexation of silver ions and olefin double bonds,effective separation of olefins/alkanes can be achieved.In this paper,six silver-based DESs(Ag-DESs)are synthesized with three common metal silver salts as hydrogen bond acceptors(HBA),three amide organic compounds and glycerol as hydrogen bond donors(HBD),and are applied to the separation of long-chain α-olefins(C8,C10).The effects of extraction temperature and silver ion concentration on the separation effect of α-olefins are explored.The Ag-DESs are characterized through infrared spectral analysis,quantum chemical geometry configuration optimization and electrostatic potential analysis.The results of gas chromatography-mass spectrometry(GC-MS)characterization show that most DESs act as an extractant that can effectively separate olefins and are selective for olefins.The selectivity to 1-octene ranges from 5.86 to 31.40,and the selectivity to 1-decene ranges from 4.78 to 15.81.The results show that the low lattice energy of silver salt and the weak complexation degree of silver ion and carbonyl group are conducive to the complexation of silver ion to olefin,so it can be more efficient to separate olefin.The separation effect is also related to the chain length of the olefin,the longer the chain length is,the weaker the double bond of the olefin and the worse the separation effect will be.
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