FORMATION AND STABILITY OF FOAMS IN WATER CONTAINING DIESEL FUEL IN THE PRESENCE OF HYDROPHOBIZED SILICA

Abstract

The formation of foams in the presence of organic liquids and the study of their properties and stability is an important scientific and practical task. The purpose of this work is to study the properties of foams that are formed in water saturated with diesel fuel (DF) in the presence of hydrophobized silica particles. Two types of silica were used as the solid phase: Aerosil-380, Ludox HS-40 and hydrophobizer-hexane-1-amine (99%) with a density of 0.766 g/cm3.Water saturated with diesel fuel was used to produce the foam. To obtain it, 50 ml of distilled water was added to 50 ml of diesel fuel (DT), stirred for 3-5 min and left in a dividing funnel at a temperature of 25 °C. After 24 h, the water was separated. Foaming was investigated when mixing a certain volume (V2) of dissolved diesel fuel and a suspension of hydrophobized solid particles with volume V1. The maximum height of the foam layer (H), which is formed in an aqueous medium containing diesel fuel in the presence of hydrophobized silica, as well as the change in its stability with an increase in the degree of hydrophobization of silica and the concentration of organic liquid, was studied. It was found that resistant to destruction foam layers (L~ 2 cm) are formed from hydrophobized Ludox HS-40 sol with a mass content of 20% and water saturated with diesel fuel, taken in equal volume ratios. When hydrophobized Ludox HS-40 was added to the suspension, dissolved diesel fuel in a larger (2-4 times) volume formed unstable foams with a higher column height H = 9-11 cm. It is shown that the foaming in the hydrophobized aerosil – dissolved diesel fuel system was insignificant (L ≤ 3 cm). The destruction of foams is due to their diffusion enlargement. The formation of a stable foam emulsion obtained from a suspension of hydrophobized aerosil and diesel fuel is possible with a volume ratio of 3:1. For citation: Vilkova N.G., Mishina S.I., Shatina E.A. Formation and stability of foams in water containing diesel fuel in the presence of hydrophobized silica. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2023. V. 66. N 6. P. 54-60. DOI: 10.6060/ivkkt.20236606.6778.