Method for preparing L-ornithine-L-aspartate

Production of L-2, 5-diaminovaleric acid-L-asparto salt by chemical synthesis is carried out by dissolving L-2, 5-diaminovaleric acid sulfate into distilled water, putting L-asparto, heating while dissolving, neutralizing sulfuric acid by barium hydroxide, cooling, filtering to remove diluted barium sulfate, chelating residual barium ion (Ba+2) by D403 chelate resin, filtering to remove chelating resin, decompressing while concentrating, de-coloring by activated carbon, filtering to remove activated carbon, agitating by anhydrous alcohol, heating, crystallizing under reflux state, filtering and drying to obtain final product. It avoids resin adsorption, resin recovery process and acid water treatment.