Method for preparing dimer acid and dimer acid methyl ester

Abstract

The invention relates to an improvement of a method for preparing dimer acid and dimer acid methyl ester by using unsaturated fatty acid and corresponding fatty acid methyl ester thereof, which is characterized in that a catalyst for reaction is sulfonate ionic liquid which contains SO3H functional groups and accounts for not less than 0.5% in parts by weight, the reaction is carried out at the temperature of 150-300 DEG C, the iodine value of products are controlled to be 65-80%, and the products and the catalyst are stratified by standing after the reaction is complete. The method has the advantages of high polymerization reaction activity, fast reaction speed and relatively mild reaction conditions, and the reaction can be carried out at atmospheric pressure and relatively low temperature, thereby not only reducing the reaction energy consumption and having low requirements on equipment, but also greatly reducing the preparation cost. The catalyst has good stability and small usingquantity, only 0.5% by weight of the catalyst can carry out full reaction, the catalyst is difficult to hydrolyze and easy to realize the phase separation with the products, the catalyst can be separated from the products only through ordinary standing or centrifugation without entrainment of the products, the catalyst can be repeatedly recycled, and the production process is environment-friendly.

Description

technical field [0001] The present invention is an improvement to the method for preparing dimer acid and dimer acid methyl ester from unsaturated fatty acid and corresponding fatty acid methyl ester, especially relates to a method for preparing dimer acid and dimer acid methyl ester by using ionic liquid as catalysis . Background technique [0002] Dimer acid and dimer acid methyl ester mainly refer to fatty acids containing eighteen carbon atoms (such as oleic acid, linoleic acid, linolenic acid) or their methyl esters under the action of catalysts to generate acyclic dimers or monocyclic di Polymer is an important chemical intermediate. Dimer acid and dimer acid methyl ester are mainly used in the production of polyamide resin, lubricant, antirust oil, surfactant, anticorrosion agent, special lubricant, iron ore flotation collector, food additive, hot melt adhesive , Plastic printing ink and other fields. With the development of dimer acid industry, new application fie...

AI Technical Summary

Problems solved by technology

However, the anhydrous aluminum chloride or anhydrous zinc chloride catalyst has strong water absorption, and water absorption will reduce the performance of the catalyst; secondly, the reacted catalyst aluminum chloride or zinc chloride needs to be hydrolyzed, and the hydrolyzed products will cause pollution , the product needs to be washed with sodium carbonate solution and water, resulting in a large amount of industrial wastewater; and the catalyst cannot be reused

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