At present, there are two main prductions process to produce high content of AI deoiled soy lecithin.
Method 1: Acetone Extraction
Raw materials soy lecithin oil which contain 60-70% acetone insouble, 1% water. Heat it to 50°C-70°C and mix with dry cold acetone in the reacter container. Use a centrifuge to stir up and mix. Obtain the suspension of fine lecithin particles. Cool the suspension to 5 ° C and use the bucket of the Bu’s under the vacuum.The suspension of fine lecithin particles is filtered to obtain a yellow powder.Put the powder in the container and dry it by hot air to get a stable creamy powder without odor. The powder contains 96 WT % Acetone insoluble.
Method 2: Physical ultrafiltration Method (UF)
Deoiling of soy lecithin through ultrafiltration (UF) using an inorganic ceramic membrane. Phospholipid (PL) reverse micelles with an average particle size of 9.8 nm were prepared in a 1:3 soy lecithin/hexane system (m/m) with 9% water added at a temperature of 25 °C. Consequently, an inorganic ceramic membrane with a pore size of 5 nm was selected. UF was employed in continuous diafiltration mode at transmembrane pressure (TMP) of 0.25 MPa, and a final deoiled lecithin product with a high acetone insoluble (AI) content of 96.32% was obtained at a yield of around 84%.