Dimer acid and synthetic method thereof

Abstract

The invention relates to a dimer acid and a synthetic method thereof. According to the synthetic method, eleostearic acid is taken as a raw material, in the presence of a polymerization inhibitor, stirring is carried out while purging with nitrogen, heating is carried out to 180-230 DEG C for reaction, and a dimer acid product is obtained after the reaction is finished. The dimer acid is synthesized by adopting the method disclosed by the invention, the molecular formula of the dimer acid is C34H58(COOH)2, and the content of the dimer acid in the product is more than or equal to 55%. Accordingto the method, eleostearic acid is used as the raw material to synthesize the dimer acid, a catalyst is not needed, the reaction conditions are relatively mild, the process is simple, and the dimer acid yield is high.

Description

technical field [0001] The invention belongs to the field of dimer acid synthesis, and in particular relates to a dimer acid and a synthesis method thereof. Background technique [0002] Dimer acid is named after its molecule contains two carboxylic acid groups, mainly refers to C18 unsaturated fatty acid under certain conditions, according to the Diels-Alder reaction to generate dimer acid with C36 as the main component. According to the reaction mechanism, the basic structures of dimer acids can be roughly divided into three categories: monocyclic, bicyclic, and acyclic. At present, commercial dimer acid is generally a mixture of three isomers. [0003] The dimer acid has a moderate molecular weight and a unique structure. The molecule has both a long flexible carbon chain and a relatively rigid ring structure. It not only has polar and non-polar groups, but also has active properties such as carbonyl and double bonds. reactive groups. These unique molecular structures ...

AI Technical Summary

Problems solved by technology

[0008] In the above-mentioned synthesis method, the synthesis of dimer acid all needs to add catalyst or / and catalytic assistant, and wherein catalyst addition amount is large, and used catalyst is powdery, and follow-up separation and purification cost is higher, and product is lost in the separation process, and will cause some environmental pollution

In addition, the polymerization reaction temperature is relatively high, generally not lower than 240°C, and some reaction processes require pressure, which requires high equipment