直鎖アルキルベンゼンスルホン酸ナトリウムの起ホウ性に対するラウリン酸ナトリウムとキレート剤の効果

抄録

A foam-controlling method of a sodium linear alkylbenzene sulfonate (LAS) in hard water has been studied with sodium laurate as a foam-controlling agent and sodium tripolyphosphate or sodium nitrilotriacetate as a sequestering agent. In the presence of sequestering agent enough to sequester almost all the calcium ions in hard water, the test solutions exhibit high foaming profiles. With decreased concentration of the sequestering agent, however, the excess calcium ions, not sequestered, lead to the production of calcium laurate which destroys the foam of the LAS. Thus, foam-controlling of the LAS in hard water becomes possible by using the sodium laurate and the sequestering agents.