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Highly efficient absorption of crude oil by organoclays, which clearly separate from water via LCAT.

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Fatty-amine modified silicate clays of layered structure were prepared by conventional intercalation of noctadecyl amine (n-C 18 H 37 NH 2 , ODA) into sodium montmorillonite clay (Na + -MMT). Organically modified clays are considered as a new type of phase change materials (PCM). At one equivalent ratio of ODA-HCl over Na + -MMT by an ionic exchange reaction, the interlayer galleries of the silicates' layered structure were expanded from 12Å to 28Å as measured by X-ray diffraction (XRD) analysis. As a result, the organoclay (ODA/MMT) became hydrophobic and spacing was accessible for incorporating a second organic compound, n-octadecane. Physical absorption of n-octadecane in ODA/MMT allowed interlayer spacing and further expansion from 28Å to 30Å. Absorption efficiency, defined as the weight of noctadecane over ODA/MMT, ranged from 5.3 to 9.1 fold depending on the amount of ODA intercalation.Since n-octadecane is a kind of paraffin wax, a phase change temperature of 25-29 C was observed.The n-octadecane was characterized by thermal gravimetric analysis (TGA) to study absorption efficiency of ODA/MMT. During the heating process, the ODA/MMT/n-octadecane powder remained in solid state without any liquid leakage at 80 C (far beyond the phase change temperature). Thus, the organoclay (ODA/MMT) can be used as good thermal storage and phase change material.

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