How to choose the right edible oil refining method?

Edible oil refining is a relatively complex and flexible process. On the whole, there are two types of refining methods. The one is chemical refining, the other is physical refining. The main difference between the two types of refining method lies in how the FFA are removed. How to choose the right edible oil refining method? Next, Henan Glory Company will make a introduction about this two types of cooking oil refining methods and we can provide the edible oil refining equipment. And you can choose the right edible oil refinery method according to your requirements.

Physical refining and Chemical refining

1. Physical refining method

The removal of FFA (free fatty acids) occurs during deodorizing process of physical refining process. Its refining process is degumming, decolorization, deacidification and deodorization. Physical refining method is more practical for edible oil with low gum content and high acid value,such as palm oil, palm kernel,etc.

In degumming process, it mainly uses the hydrophilicity of phospholipids to remove natural gums by adding hot water or food grade phosphoric acid to the crude edible oil. Then, in bleaching process, it mainly uses the activated clay to adsorb the colouring matters or other metal ions under vacuum. While the deacidification and deodorization process is under high temperature and low pressure. By using steam, the FFA can be removed. What's more, the off-flavors can also be removed from the crude edible oil in the steam distillation process.

Edible oil refining machine

2. Chemical refining method

The removal of FFA (free fatty acids) occurs during deacidification process of refining process. The basic refining process is degumming, deacidification, decolorization and deordorization. Chemical refining method is a general type.

(1) Degumming process:

We mainly use hydration degumming process to remove gums from crude edible oil with the help of phosphoric acid.

(2) Deacidification process:

We mainly use acid-base neutralization method to remove FFA, during this step, we can get soap stock which is the raw material of soap production line.

(3) Decolorization process:

Same with physical refining method, the decolorization process of chemical refining is also uses white clay to adsorb unwanted pigments and other metal ions to let the color of edible oil will become much lighter.

(4) Deodorization process:

The purpose of deodorization process is to remove unacceptable odors by steam distillation. In the deodorization process, the odoriferous compound are stripped off by injecting steam into heated oil under high vacuum pressure.

Palm oil refining plant

The above is a brief introduction to the physical refining method and chemical refining method. As for how to choose the right edible oil refining method. You need to decide based on the characteristics of your raw materials and the final product you want to get. Henan Glory Company has more than 10 years of experience in manufacturing edible oil refining equipment. We can help you choose the right edible oil refining method and customize the edible oil refining production line equipment for you based on your raw materials. If you have needs, please contact us freely.