The present invention includes: a high purity liquid ammonia treatment step, refined phosphoric acid solvent extraction step purification of chlorogenic acid, solvent extraction, refining for phosphate barium sulfate separation step, solvent extraction.
Sa kasalukuyan may mga iba't-ibang mga pamamaraan para sa paghahanda ng mga pelikula, tulad ng MoO3 singaw salaysay, electrochemical pagtitiwalag, sputtering, sol - gel .