Introduction of Deacidification System of Crude Oil Refinery Plant
Deacidification system of crude oil refinery plant is for removing free fatty acids(FFA) from pressed or extracted crude oil. Since FFA would produce irritating odor and accelerate the hydrolysis rancidity rate of neutral oil, deacidification is necessary and it has long been used as the greatest economic benefits for crude oil refining process, and the removal of FFA from crude oil is also the most difficult process in the crude oil refinery plant. If the process is mature enough, deacidification could achieve the effects of removing irritating odor, inhibiting oxidative rancidity, enhancing the physical and chemical stability of oil and determining the quality of final oil product.
Common industrial deacidification methods are alkali refining (chemical deacidification method), steam distillation (physical deacidification method) and solvent extraction (mixed deacidification method), the most widely used methods are alkali refining system and steam distillation method.
Alkali Refining Process
Alkali refining for removing acid is the most critical step in the entire refining process, and it creates conditions for decolorizing, deodorizing, hydrogenating and deep processing of oil. After alkali refining, oil quality is improved, oil stability is increased and its storage time is prolonged. Alkali refining method is using alkali to neutralize FFA in the oil to generate soap and the generated soap can adsorb impurities. Soap and impurities are then subsided and separated from the oil by gravitational sedimentation separation method or by centrifuge. Alkali refining is divided into intermittent type and continuous type, and the intermittent type is suitable for concentrated alkali refining at low temperature with steps like pre-treatment→lye neutralization→separation of soap stock→washing separation→dehydration(desolution)→filtration→soap stock processing→packing.
Features of Oil Deacidification System of Crude Oil Refinery Plant
1.The machine capacity is customized according to your requirement.
2.Oil deacidification machine can be flexibly worked with the entire oil refining line or can be used alone.
3.The machine is made of food-grade stainless steel with polishing treatment, the materials are not stained or damaged.
4.The deacidification tank is controlled by electrical box, simple and safe operation. The customer can operate the machine well after video training.
Main Equipment of Oil Alkali Deacidification
Soap blending tank
Oil and alkali proportioning device
Mixing machine: ① blade mixer; ② centrifugal mixer; ③ static mixer.
Centrifuge: ① tube centrifuge; ② disc centrifuge.
Disc centrifuge is mainly made up of the fuselage, drum, transmission, and water distribution devices. The mixture enters the drum from the bottom or top, then enters the discs from the dispensing holes in the lower and middle discs, and slides towards the inner wall of the drum, after that, the mixture is diluted by the flushing water come from the lower dispenser. And along the inner wall of the drum up into a centripetal pump in pump area, under the action of the centripetal pump the heavy material is discharged to the heaviest phase outlet, while the light material is discharged from light phase outlet.