Refinement of Menthol Induced by Electromagnetic Field and Properties of its Crystal
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Abstract:
This article aims to explore a new refined method for menthol extract (93.5%) with the aid of the external magnetic field. The influence of factors such as crystallization temperature, solution concentration, solvent type and intensity of magnetization on crystallization was also investigated. The crystallization conditions for L-menthol was optimized with the help of electromagnetic inducement, and the purity could reach 99.1% (GC-MS). Magnetic field greatly shortened the crystallization time and improved purity of crystals. Optical analyzer, differential thermal scanners, infrared spectrometer and gas chromatography-mass spectrometer were used to characterize the crystal of high purity. Optical analyzer analysis showed that the optical activity of the crystal was increased by 1.29%, 2.93% and 0.74% after magnetization treatment under different conditions. Differential thermal analysis showed that magnetic induction significantly shorten crystal melting process by 23.77%, 32.32% and 30.88% and improved the melting enthalphy by 0.89%, 1.65% and 2.84%. Infrared spectrometer and gas chromatography-mass spectrometer analysis showed that crystal structure remained unchanged. Magnetic induction could enhance crystallization progress of menthol and make it easier to obtain crystal of high quality.
