Method for producing pale disproportionated rosin with high content dehydroabietic acid and P-camphogen simultinuously

Abstract

The process of producing pale disproportionated rosin with high dehydroabietic acid content and paracymene simultaneously includes the following steps: rinsing turpentine to eliminate impurity, dissolving turpentine in turpentine oil to form turpentine solution, catalytic disproportionating turpentine in solution in the presence of Pd / C catalyst, filtering and decompression distillation to obtain pale disproportionated rosin with high dehydroabietic acid content and disproportionated turpentine oil containing paracymene in 20-60 %, and distilling disproportionated turpentine oil to obtain paracymene and pinane. Or, the rinsed turpentine as material may be re-crystallized to purify and catalytically disproportionated to prepare pale disproportionated rosin containing high dehydroabietic acid in 72-82 %. The Pd / C catalyst may be replaced with skeletal nickel catalyst.

Description

technical field

[0001] The invention relates to a method for deep processing of rosin, in particular to a method for simultaneous production of light-colored disproportionated rosin with high content of dehydroabietic acid and p-cymene technical background

[0002] Disproportionated rosin is an important deep-processing product of rosin. Its main use is as emulsifier for synthetic rubber polymerization, and it can also be used in the manufacture of water-soluble pressure-sensitive adhesives. The main chemical component of disproportionated rosin is dehydroabietic acid (also known as dehydroabietic acid), which accounts for about 40-60% of the weight of disproportionated rosin. The dehydroabietic acid obtained by isolation can be used in the synthesis of drugs, antibacterial agents, antifungal agents, bactericidal pesticides and various surfactants. p-Cymene (also known as p-cymene) is a deep-processed product of turpentine and an important organic chemical raw material. P-...