按苏联现行工艺生产脂松香,如果枞酸含量大于40-42％,都有较大的结晶倾向。其原因虽至今尚不甚了解,但探明和排除枞酸在松香中聚集的因素,显然是预防松香结晶的途径之一。松脂中的树脂酸混合物在热和酸催化剂作用下,发生异构作用,枞酸含量增加,这在松节油蒸发过程中尤为剧烈。树脂酸异构化的程 According to the current Soviet Union production of gum rosin, abacic acid content greater than 40-42%, have a greater tendency to crystallize. Although the reason is not yet understood, it is obviously one of the ways to prevent the rosin from being crystallized by identifying and ablating the factors that abietic acid aggregates in the rosin. The resin acid mixture in the rosin isomerised under the action of heat and acid catalyst, the content of abietic acid is increased, which is especially intense during the turpentine evaporation. Resin acid isomerization process