PREPARATION METHOD OF PIMARIC ACID TYPE RESIN ACID

摘要

Preparation method of pimaric acid type resin acid includes the following steps: (1) adding refined resin acid, turpentine or rosin and maleic anhydride at a mass ratio of 1 :0.3-1.5 into a reaction bottle, dissolving them in C 1 ˆ¼C 10 lower fatty acid solvent, the mass ratio of the C 1 ˆ¼C 10 low fatty acid to refined resin acid is 0.05-30: 1, then carrying out addition reaction by heating directly or with assistance of microwave, subsequently cooling, crystallizing, filtering, and washing, and (2) combining the filtrates collected in step (1), stripping of the solvent by vacuum distillation to obtain pimaric acid type resin acid coarse product, dissolving the resulting coarse product in NaOH aqueous solution to prepare aqueous solution of pimaric acid type resin acid salt, adjusting pH to 6-14 with a mineral acid or an organic acid under stirring, and directly purifying or acidifying followed by purifying the resulting precipitation to obtain the final product. The method has the characteristics of high yield, high product content, low cost, and low environmental pollution.