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Chemistry and Industry of Forest Products ›› 2019, Vol. 39 ›› Issue (2): 115-121.doi: 10.3969/j.issn.0253-2417.2019.02.017

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Separation of Unsaturated Fatty Acids by Melamine Inclusion Method

Peiyan WANG1,Yuanbo HUANG1,*(),Shouqing LIU1,Zhifeng ZHENG1,2,Delu NING3   

  1. 1. National-Local Joint Engineering Research Center for Highly-Efficient Utilization Technology of Forest Biomass Resources; Key Laboratory for Highly-Efficient Utilization of Forest Biomass Resources in the Southwest China, National Forestry and Grassland Administration; Yunnan Provincial International Joint Research Center for Bio- energy, Southwest Forestry University, Kunming 650224, China
    2. Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass; Xiamen Key Laboratory of High-valued Conversion Technology of Agricultural Biomass; College of Energy, Xiamen University, Xiamen 361102, China
    3. Economic Forest Research Institute, Yunnan Academy of Forestry, Kunming 650201, China
  • Received:2018-11-24 Online:2019-04-25 Published:2019-05-08
  • Contact: Yuanbo HUANG E-mail:youthshow@163.com
  • Supported by:


Separation of unsaturated fatty acids (UFAs), including monounsaturated (MUFAs) and polyunsaturated fatty acids (PUFAs) from mixed fatty acids (FAs) by melamine inclusion method were investigated. Effects of melamine/FAs mass ratio, crystallization inclusion temperature and inclusion time on yield, purification, and inclusion rate of UFAs were discussed. The melamine inclusion complex was characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) and nuclear magnetic resonance (NMR) spectroscopy. Results showed that saturated fatty acids (SFAs) could be employed to form the inclusion crystallization (complex) in ethanol at low temperature by melamine. The optimized conditions were FAS 20 g, 95% ethand 96 mL, mass ratio of melanine and FAs (M/F) 0.9:1, dissolving at 75 ℃, inclusion at 9 ℃ for 7 h. Under these conditions, the maximum UFAs (yield of 60.83%, purity of 93.75%, and inclusion rate of 87.23%) were obtained. Compared with the ureainclusion method, the purity and inclusion rate of UFAs were higher, and MUFAs and PUFAs could be separated together from SFAs by melamine inclusion method. Compared with melamine crystals by structural analysis, the crystal structure of melamine inclusion complex with SFAs did not change, and SFAs could enter into melamine crystalline lamellae to form stable crystalline inclusion complex. After inclusion, melamine could be recycled, which would be promoted the further development of fatty acids separation.

Key words: fatty acids, separation, melamine inclusion method

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