The company attaches importance to the role and training of technical talents, actively introduces foreign technical experience,and through the perfect quality management system certification, production of marketable high and new, sharp products, thus in a variety of fuel, rice, wheat, corn, and other areas of the processing machinery and equipment have domestic advantage.
The oil refining process mainly includes processes such as crude oil removal, degumming, deacidification, decolorization, deodorization and dewaxing. Oil refining can take different refining steps and control process parameters according to the quality index requirements of the refined oil of different quality levels. The purpose of oil refining is to remove the impurities contained in the crude oil, maintain the biological properties of the oil, and retain or extract useful substances. Oil refining is to selectively remove impurities to remove insoluble solid impurities, peptic impurities, oil-soluble impurities, moisture, etc. contained in crude oil.
The methods of oil refining are roughly divided into three categories: mechanical method (physical method), chemical method and physical chemical method.
Methods and applications of oil refining:
|
Method |
Basic process |
Principle of action |
Application characteristics |
|
Mechanical law |
Precipitation, filtration |
Use density difference to settle or filter to remove mechanical impurities |
Removal of crude oil; removal of waste clay and catalyst |
|
Centrifugal separation |
Use high-speed centrifuge to separate soap feet and oil-water feet |
Degumming, desoaping, dehydration, dewaxing fat, etc. |
|
|
Chemical method |
Alkali refining |
Neutralization of free fatty acids; partial decolorization; reasonable degumming |
All kinds of fats and oils that need to remove free fatty acids |
|
Sour |
Add acid to remove gum and part of pigment |
Need to be physically refined or inferior oil |
|
|
Hydrogenation |
Hydrodecolorization, deodorization, increase saturation |
Palm oil decolorization and deodorization; hardened oil raw material processing |
|
|
Esterification, oxidation |
Esterification deacidification, redox decolorization |
Generally used in industrial oil, rice bran oil with high acid value |
|
|
Physical Chemistry Method |
Hydration |
Add water or dilute electrolyte to hydrate phospholipids and separate gums |
Phosphorus-containing light-colored oil with an acid value of less than 5, such as soybean oil |
|
Adsorption decolorization |
Add adsorbent to remove pigment and gum |
The production of high cooking oil and salad oil must be decolorized |
|
|
Steam distillation |
High vacuum direct steam to remove free fatty acids, odor substances, etc. |
High acid value oil degummed directly after degumming, deacidification consumes less |
|
|
Liquid-liquid extraction |
Use solvent to remove free fatty acids |
Oils with high acid value that cannot be refined by alkali or physically refined |
|
|
Frozen crystallization, winterization |
Frozen crystallization dewaxing or winterization crystallization to separate solid fat |
Production of salad oil with wax and solid fat oil |
|
|
Blended oil refining |
Use leaching mixed oil to add alkali to neutralize free fatty acids, centrifugal separation |
Cottonseed oil, castor oil, etc. in the extraction workshop |
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