Pretreatment of anionic ion exchange resin components with sulfonated polymerization (ethylene aromatic hydrocarbon) aggregates is particularly effective in providing non-cohesive mixing bed systems that do not affect the kinetic properties of ion exchange.

For sulfonated (ethylene aromatic hydrocarbon) aggregates with a molecular weight of 5,000 to 1,000,000, the treatment capacity is 10 to 800MG/1 anion exchange resin is particularly preferred. Mixed bed ion exchange resin isolated and purified egg yolk lecithin has an optimal resin ratio, in 201 and 001 ratio of 3:1, lecithin (PC) recovery rate is the highest, in the best resin ratio, get better operating conditions for temperature 10℃~20℃, sample concentration 100mg/ml. At this time, PC yield can reach more than 80%: through the penetration curve experiment, it is concluded that the maximum processing capacity of the mixed resin is 0.31g sample/ml resin, and get the PC content of the 92% (wt%) products.