How much do you know about the oil refinery machine？BTMA

Oil refining is an important part of the edible oil production process. The oil refinery machine does not require filter cloth and greatly reduces refining costs. It is the preferred equipment in the filtration industry.

Edible Oil Refining is a general term for the removal of solid impurities, free fatty acids, phospholipid, colloid, wax, pigment and odors in vegetable oils. The presence of impurities contained in crude oils not only affects the use value, the safety storage of crude oil, but also cause difficulties for the deep processing crude oils. Edible oil refining not only removes all the impurities out from the crude oils, but also refines harmful impurities, such as, gossypol, protein, lecithin, mucus, water and more. In this way, the edible oils can have better storage, more industrial applications and cooking purpose. However, some beneficial substances, such as tocopherol, sterol and more, will be maintained. That is why edible oil needs oil refining process. According to different requirements and USES, the unnecessary and harmful impurities are removed from the oil to obtain refined oils and pure oils.

Basic workflow of oil refinery machine

Crude oil – degumming (washing) – deacidification (alkali refining) – decolorization (white clay adsorption) – dehydration (heating and drying) – product oil

Small-scale oil refinery machine uses crude oil (peanut oil, rapeseed oil, tea seed oil, soybean oil, sunflower seed oil, flax oil, walnut oil, sesame oil and other edible oils) for hydration,degumming, deacidification, decolorization, and deodorization by heating and stirring.

1、Hydration degumming

Hydration degumming is to use the hydrophilicity of peptizing impurities such as phospholipids, add a certain amount of water or diluted electrolyte solution to crude oil under stirring, so that the peptizing impurities in the crude oil will absorb water and expand, then condense, separate and finally they will be removed. In the process of hydration and degumming, the substances that can be aggregated and precipitated are mainly phospholipids, in addition to proteins, mucus and trace metal ions that are combined with phospholipids.

2、Alkali refining and deacidification

All unrefined crude oils contain a certain amount of free fatty acids, and the process of removing free fatty acids in grease is called deacidification. Methods of deoxygenation include alkali refining, distillation, solvent extraction, and esterification. What are widely used in industrial production are alkali refining and steam distillation (that is, physical refining).

3、Decolorization of fats

Fats by adsorption and decolorization is to use certain substances with strong selective adsorption of pigments (such as bleaching clay, activated clay, activated carbon) to absorb pigments and other impurities in the fats under certain conditions so as to achieve the purpose of decolorization. The grease treated by the adsorbent not only achieves the purpose of improving the oil color and removing the gum, but also can effectively remove some trace metal ions in the grease and some substances that can cause hydrogenation catalyst poisoning, thereby providing good conditions for further hydrogenation, deodorization of grease.

4、Oil deodorization

Oil deodorization is a process that use the difference in volatility between odorous components in oils and triglycerides to remove odorous substances by steam distillation under high temperature and high vacuum conditions. The purpose of the principle of steam distillation deodorization is that water vapor passes through the fat containing odor components and contacts the vapor-liquid surface. The water vapor is saturated with volatile odor components and escapes at the ratio of the partial pressure to achieve deodorization.