苯甲醛反应沉淀分离L-精氨酸

考察了pH值、苯甲醛与L-精氨酸的摩尔比、氯化钠和氯化铵浓度、L-赖氨酸与L-精氨酸的质量比及L-精氨酸初始浓度等因素对苯甲醛反应沉淀L-精氨酸的影响. 结果表明，苯甲醛反应沉淀L-精氨酸的pH>11为宜；苯甲醛与L-精氨酸的摩尔比为1.25时，L-精氨酸的沉淀率可达到90%以上；氯化钠对沉淀基本上没有影响，而氯化铵浓度增大则沉淀率迅速下降；当L-赖氨酸与L-精氨酸的质量比小于1时L-精氨酸沉淀率仍可以在80%以上，当它们的质量比大于1以后，沉淀率迅速下降；L-精氨酸初始浓度应在15 g/L以上才可保证沉淀在90%以上.

Separation of L-arginine by Reacting Precipitation with Benzaldehyde

Effects of pH, mole ratio of benzaldehyde to L-arginine, NaCl and NH4Cl concentrations, mass ratio of L-lysine to L-arginine and initial L-arginine concentration on L-arginine precipitation yield by reacting with benzaldehyde were investigated. Results show that the maximum precipitation yield(90%) is reached at pH higher than 11 and mole ratio of L-lysine to L-arginine of 1.25, the yield hardly changes with the increase of NaCl concentration but decreases sharply with the increase of NH4Cl concentration, the precipitation yield also decreases with the increase of mass ratio of L-lysine to L-arginine. The initial L-arginine concentration should be more than 15 g/L to keep over 90% precipitation yield.