Abstract
Aseries ofβ-glycols such as 1, 3-alkanediols (C8C18), erythro-and threo-2, 4-alkanediols (C3C16), and erythro-and threo-3, 5-, 4, 6-, .5, 7-dodecanediols were prepared and their antifoaming pro-perties for the aqueous solution of sodium dodecylbenzenesulfonate as a foaming agent were evaluated by the Ross-Miles foam tester (JIS K 3362) and the dynamic foam meter (JIS K 2518).
The results of these experiments were shown in Fig.-1Fig.-15. It was found that the aatifoam-ing properties of the β-glycols were dependent upon their molecular weights, the position and the rotational arrangements of two hydroxyl groups in the molecules.
(1) The antifoaming Powers of the β-glycols increased in the order C17=C16>C18=C15=C14>C13>C12>C11=C10=C9=C8.
(2) The antifoaming powers of dodecanediols were greater when two hydroxyl groups were located near the center of an alkyl chain (Fig.-18).
(3) Threo isomers showed better antifoaming Properties than those of erythro isomers (Fig.-17 and Fig.-18).
