An easy and inexpensive process by which a concentrate of a given unsaturated fatty acid can be obtained from a mixture which has conventionally been difficult to concentrate. The process, which is for producing a concentrate of a desired isomer (a) from a mixture (A) selected from the group consisting of a mixture comprising at least two isomers of a C
16
or higher conjugated unsaturated fatty acid and a mixture comprising at least two cis-isomers of a C
16
or higher unsaturated fatty acid having a cis-double bond, is characterized by comprising: a step in which the mixture (A) is mixed with at least one C
4-14
saturated fatty acid (B) to obtain a mixture solution containing the isomer (a) dissolved therein; a crystallization step in which either crystals rich in the isomer (a) or crystals poor in the isomer (a) are precipitated from the mixture solution; and a solid-liquid separation step for obtaining the crystals rich in the isomer (a) or for obtaining a solution rich in the isomer (a) by removing the crystals poor in the isomer (a).
一种简单且低成本的方法,可以从传统上难以浓缩的混合物中获得给定不饱和
脂肪酸的浓缩物。该方法用于从选自组中的混合物(A)中生产所需异构体(a)的浓缩物,该组包括至少两种C16或更高的共轭不饱和
脂肪酸异构体的混合物和至少两种具有顺式双键的C16或更高不饱和
脂肪酸顺式异构体的混合物,其特征在于包括以下步骤:将混合物(A)与至少一种C4-14饱和
脂肪酸(B)混合以获得溶解了异构体(a)的混合物溶液;结晶步骤,在该步骤中,从混合物溶液中沉淀出富含异构体(a)的晶体或富含异构体(a)的晶体;以及固液分离步骤,通过除去富含异构体(a)的晶体来获得富含异构体(a)的晶体或溶液。