Hydrophobization Of Bleaching Clay Used For Purification Of Waste Frying Oils

The paper presents the results of research on the possibility of carrying out the hydrophobization process of bleaching clay Jeltar 100 and the usage of such modified sorbents for purification of waste frying oils. The hydrophobization process was carried out with the usage stearic acid solutions with organic solvents. The hydrophobization degree of modified sorbent was determined. Utility properties of the hydrophobic sorbent were evaluated in contact with waste frying oils. It has been proved that the properties of the sorbent Jeltar 100 (raw material) after the hydrophobization process are improved. The density of frying oil after the purification process decreases. The acid value of the purified oil decreases significantly when the hydrophobic Jeltar 100/5 (material after modification) was used. The greater increase is observed in iodine value for oil purified by sorbent Jeltar 100/5. Peroxide value of oil after its purification increases to the value obtained for waste frying oil, however, in the case of the sorbent Jeltar 100/5 increase in this parameter is reduced. It has been found that the hydrophobized sorbent absorbs a smaller amount of liquid products from crude oil than the raw sorbent. The hydrophobization process improves both the adsorption and mechanical properties of the sorbent Jeltar 100. Hydrophobic bleaching clay has better dispersion in volume of purified oil that results in improvement in oil regeneration.