Edible oil refining process machinery technology

Edible oil refining process machinery is designed with own heat source, electric control system. User only need to prepare power, water, fuel, caustic soda, phosphoric acid and clay etc to complete the edible oil refining process.

Edible oil refining machinery

Major process during high grade edible oil refining process:
Neutralization pot: For acid refining, alkali refining and water washing.
Decolorization pot: Bleach oil and remove pigment.
Deodorization pot: Remove odor of oil(Made of stainless steel).
Heat conduction oil furnace: Provide heat energy for production,the temperature can reach 280℃.
Vacuum pump: Provide vacuum degree for decolorization and deodorization,up to above 755mgHg.
Air compressor: Dry decolorized bleaching clay.
Filter press: Filter bleaching clay.
Steam generator: Provide steam for deodorization & distillation

Edible oil refining machienry

Operation instruction of edible oil refining process machinery unit:
Preparation for starting equipment:
1.Test crude oil,and test acid value and color,if you have laboratory, please do sample test.
2. Connect cooling water
3. Prepare bleaching clay,caustic soda(NaOH) and coal;
4. Connect electric power.
5. Check whether vacuum pump,air compressor,filter and heat conduction oil pump are ok.
6. When changing heat conduction oil,must heat it for 5 hours about 98℃.If there is no steam to spill from head tank,it’s ok to heat it to 280℃ slowly.

Edible oil refining flow chart

Alkaline refining operation instruction:
Starting equipment: Light heat conduction oil furnace,control the temperature of heat conduction oil at about 98℃.Start vacuum pump,after it’s normal,it’s ready to be used.
Operation process of batch refining: (1)feeding oil (2)heating (3)acid refining (4) alkali refining (5)water washing 2-3 times (6)drying and dehydration, the total time is about 24 hours.

Alakli refining operation methods include low temperature concentrated alkali method(initial temperature is 20-30℃,alkalinity is 20-30Be) and high temperature light alkali method(initial temperature is 75℃,alkalinity is 10-16Be) according to alkalinity and oil temperature,the former is used widely,and the latter is mainly used for crude oil with low acid value,light color and little impurities.

Water washing
After soap-stock is discharged,continue to heat oil to 90℃,then add hot water for water washing and stirring.Water temperature should be about 5-10℃higher than oil temperature.If water temperature is too low, it will cause emulsification easily.After finishing adding water,continue to stir t for 5 mins,then static settlement for 4 hours, discharge soap water,water wash 2-3 times repeatedly,it depends on clear oil quality. Heat water washing clear oil to 105℃ slowly,stir and dehydrate for 1 hour,water washing clear oil can also suck into decolorization pot directly for vacuum drying for 30mins.

Decolorization operation instruction
Start vacuum pump,vacuum degree is higher than 700mmHg.
Suck alkali refining oil after water washing into decolorization pot,stir it and at the same time,heat it to 90℃,and then stir it for 30 minutes, to decrease the moisture to below 0.1%,then suck little decolorizer(bleaching clay,active carbon),additive amount depends on color of oil, generally speaking, it’s 2-5% of oil weight, stir it for 30 mins, after decreasing temperature to 70℃,then use compressed air to press it into filter to separate bleaching clay from oil,and then get decolorant oil.

Deodorization operation instruction
Decolorant oil is sucked into deodorization pot by vacuum pump, when vacuum degree reaches above 755mmHg,start distillation and at the same time, time for deodorization.
1.Deodorization time: 4 hours
2.Deodorization temperature: 240℃/755mmHg 260℃/759mmHg
3.Deodorization vacuum degree: above 755mmHg.
4.During the whole timing process:must steam distillation.
5.After finishing deodorization,continue to shut off direct steam under vacuum condition,shut off heat conduction oil,open cooling water valve,when the temperature of oil decreases to about 40-80℃,shut off vacuum pump valve, after inspection by sampling is qualified,it will be packed and the whole high class cooking oil production process is finished.

Caution with high grade edible oil refining process:
1. (1)After changing heat conduction oil every time,the temperature of heat conduction oil furnace must be kept at about 90℃ and circulated for above 5 hours.
2. (2)About neutralization pot and decolorization and deodorization equipment,heat energy must be distributed and adjusted reasonably.When deodorizing,must guarantee the temperature of deodorized oil at 240-260℃,other equipments are mainly adjusted by valves.
3. (3)After maintenance,all heat conduction pipelines must use graphite gasket,adopt high temperature valves when changing valves.
4. (4)Before lighting heat conduction furnace, must start heat conduction oil pump firstly, after heat conduction oil furnace’s flameout, heat conduction oil pump must remain in operation, it can not be shutted off until the temperature of heat conduction oil decreases below 100℃.