This figure is an image of the weak acid site in H-[Ga]-ZSM-5 catalyst estimated by DFT calculation.

Water titration method which is used for measuring the number of ml's of water (Water Number, or W.N.) required for making the system turbid by adding distilled water dropwise into a fixed quantity of a mixed solution of nonionic surfactant and solvent, was applied to several nonionic surfactants, such as those involving ester linkage, alkyl phenols, alkyl phenol-formalin resins and lower aromatic alcohols, and study was made for comparison of these samples.(1)Comparing the two mixed solvents, DB-4 (dioxane containing 4vol% benzene) and DB-10 (dioxane containing 10vol% benzene), the end point of titration for DB-10 was sharper than that of DB-4.(2)For naerly all of the nonionic surfactants, the water number increased linearly with increase 33

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