关键词: 尿包固相物, 混合溶剂, 回收, 尿素, 脂肪酸, 尿素包合法

Abstract: The technology using methanol-toluene binary solvent mixtures to recover urea and fatty acids from urea inclusion compounds was chosen as the best method through comparative experiments among five kinds of processes. The recovered yields of fatty acids and urea were 99.12% and 99.46% respectively，when the ratio of urea inclusion compounds - methanol - toluene was 1∶3∶3（g∶mL∶mL）. Recovered fatty acids was analyzed using FT-IR，GPC and GC-MS. FT-IR spectroscopy identified the structure of recovery material，finding that both saturated and unsaturated fatty acids were contained. Relative molecular weight of recovery fatty acids was 443 with a content of 93.92%. Six kinds of fatty acids were identified and content of UFAs（93.96%）were detected in recovery fatty acids via GC-MS. In recovered urea，long needle-like cylindrical crystal structure was observed using SEM，with a better crystallinity. Recovered urea reused for isolating PUFAs were investigated six times. The contents and yields of PUFAs purified by recovery urea were among 81%～89% and 60%～72% respectively，and the purity of UFAs was 100%.

Key words: urea inclusion compounds, mixed solvent, recovery urea, fatty acids, urea adduction fractionation