| 摘要 |
PROBLEM TO BE SOLVED: To produce an acyclic dimer acid efficiently even when the starting material for the dimerization for producing it is a plant-derived fatty acid having a high linolic acid content and a high iodine value. SOLUTION: In producing the dimer acid, a plant-derived fatty acid having an iodine value of 120-145 is dimerized stepwise. The production method comprises the following two steps: the first step wherein the plant-derived fatty acid is dimerized at 200-245°C in the presence of a clay catalyst, a lithium salt, and water within a reaction time of 1 hr and then a monomer acid mainly comprising an octadecenoic acid, e.g. oleic acid, is separated by distillation; and the second step wherein the monomer acid produced by the first step is dimerized at 230-245°C in the presence of a clay catalyst, a lithium salt, and water. By these first and second steps, an acyclic dimer acid constituted of linolic acid and an acyclic dimer acid constituted of oleic acid are selectively and separately produced. COPYRIGHT: (C)2005,JPO&NCIPI
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