Oil refinery or petroleum refinery is an industrial process plant where crude oil is transformed and refined into more useful products such as petroleum naphtha, gasoline, diesel fuel, asphalt base, heating oil, kerosene, Vegetable oils etc.
There are various prodcuts required in the process of Oil refining. Some of them are Activated Carbon, Activated Bleaching earth, Phosphoric Acid etc.
In the process of refining, the oil is heated for complete removal of excess moisture and post that, it is treated with measured quantity of bleaching earth & activated carbon. The role of phosphoric acid is to treat the lecithin components in the oil. This process includes an add-back neutralization of the phosphoric acid which is needed to neutralize free fatty acids, yielding sodium soaps which separate out.