Complete set of walnut oil production line solutions

Degumming Process

The walnut oil degumming process removes phospholipids and colloids from the walnut oil. The equipment used is a degumming tank (with stirring and jacket temperature control).

Phosphoric acid degumming: heat the virgin oil to 75°C, add 0.1%-0.3% food-grade phosphoric acid, and stir for 20 minutes.

Enzymatic degumming (more environmentally friendly): add phospholipase A₂, react at 45°C for 2 hours to hydrolyze phospholipids.

Centrifugal separation: speed ≥10000rpm, separate colloids (residual colloid ≤0.1%).

Deacidification Process

The walnut oil deacidification process neutralizes the free fatty acids in the walnut oil. The equipment used is an alkali refining tank (alkali corrosion resistant material).

Alkali solution preparation: food grade sodium hydroxide solution (concentration 10%-15%).

Neutralization reaction: oil temperature 75-85℃, alkali solution slowly sprayed, stirring speed 30-50rpm, soap stock layer thickness ≥10%.

Water washing: wash 3 times with 80℃ hot water, soap stock residue ≤50ppm.

Decolorization Process

The purpose of the walnut oil decolorization process is to adsorb pigments and impurities. The equipment used is a clay mixer and a vacuum decolorization tank.

Amount of clay added: 2%-5% (compound of activated clay and attapulgite).

Temperature: 110-130℃, vacuum degree ≤10Pa.

Time: 20-30 minutes, oil color after decolorization ≤Y30 R3.0 (Lovibond colorimetric method).

Deodorization Process

The purpose of deodorization is to remove volatile substances. The equipment used is a molecular distillation deodorization tower or a packed tower deodorization system.

Vacuum degree ≤ 0.1Pa, temperature 180-220℃, direct steam.

Deodorization time ≥ 4 hours, free fatty acid removal rate ≥ 99%, odorous substance removal rate ≥ 95%.