LNSH, HYDROPHOBIC WATERPROOFING MATERIAL CAPABLE OF BINDING OIL PRODUCTS Russian patent published in 2024 - IPC B09B3/00 C09K3/32 C02F1/28 C02F101/30 E21C41/32 

FIELD: ecology.

SUBSTANCE: invention relates to the field of ecology, to the technology of hydrophobising the surface of particles of finely dispersed mineral hydrophilic substances and substances of vegetable origin. Described is a hydrophobic oil-binding material from coffee cake and lime, obtained from the introduction of coffee cake with a residual moisture content of up to 10% into the stirred reaction mass of the lime slaking process at the initial stage of its development, when temperature reaches 100°C in the weight ratio of the initial components lime: water: coffee cake, which can be in range of 2:1:1÷2:1:6, which guarantees quality characteristics of the product, namely: material is lighter than water, bulk density is 0.86 kg/dm³, material has positive buoyancy, there are no manifestations of microorganisms vital activity in the material, material differs by the fact that binding properties of the obtained material with respect to oil with density of 0.82 g/cm³ are characterized by specific consumption of kg/kg of oil: 2.3–1.5 depending on ratio of components in reaction mass, and extraction of organic acids from coffee cake, their orientation by hydrophobic centres to periphery, hydrophilic - inside to surface of particles and final attachment to hydrophilic active centres of particles of mineral and plant components of reaction mixture with formation of hydrogen bonds and chemical compounds occurring during mechanical mixing of the reaction mass against the background of a powerful exothermic thermal effect of the lime hydration reaction, accompanied by an increase in the physical pore volume of the hydration products, wherein, first, during its synthesis, the water repellent is not added in the form of surfactants, but is extracted in the form of amphiphilic molecules of organic acids, including fatty acids, from coffee cake at descending temperatures of lime slaking in range of 100–50°C; secondly, during its synthesis there is no need for heat supply, since modification is carried out at high temperatures of the exothermic lime slaking process; third, high reactivity of calcium hydroxide formed during lime slaking is capable of initiating saponification reactions with organic acids present, which can lead to formation of solid soap-like structures.

EFFECT: use of large-tonnage wastes of agriculture and food industry, such as spent vegetable cake.

1 cl, 3 dwg, 1 ex