本文对气相法CO催化偶联制取草酸二甲酯新工艺进行了实验研究。在气相流动循环系统中,采用固定床反应器,对研制的两种新型催化剂A_3、A_4进行了偶联反应催化性能测定。实验结果表明,草酸二甲酯的空时收率与催化剂的活化温度、原料气的...本文对气相法CO催化偶联制取草酸二甲酯新工艺进行了实验研究。在气相流动循环系统中,采用固定床反应器,对研制的两种新型催化剂A_3、A_4进行了偶联反应催化性能测定。实验结果表明,草酸二甲酯的空时收率与催化剂的活化温度、原料气的浓度及反应温度有关。通过对实验数据的关联,得到草酸二甲酯空时收率y DMO与原料气浓度的幂数型关系为: y DMO=k·C_(CO)~α·C_(MN)~β式中:α=1,β=2.5,k=3.26×10~4。C_(CO)·C_(MN)分别为CO和亚硝酸甲酯的浓度。展开更多
A multiphase enzyme membrane reactor using aqueous organic biphase instead of water phase alone as the reaction medium was employed to investigate the lipase catalyzed synthesis of bioactive dipeptides. The medium eff...A multiphase enzyme membrane reactor using aqueous organic biphase instead of water phase alone as the reaction medium was employed to investigate the lipase catalyzed synthesis of bioactive dipeptides. The medium effect on dipeptide yield was first studied. When N acetyl L phenylalanine ethyl ester(APEE) was used as a carboxyl component, the reactivity order of amino acid amides was found to be L Leu NH 2> L Val NH 2> L Ala NH 2> L Gly NH 2. The didpetide, N Ac L Phe L Leu NH 2, could be synthesized in the multiphase enzyme membrane reactor in a high yield and purity due to the simultaneous separation and reaction.展开更多
文摘本文对气相法CO催化偶联制取草酸二甲酯新工艺进行了实验研究。在气相流动循环系统中,采用固定床反应器,对研制的两种新型催化剂A_3、A_4进行了偶联反应催化性能测定。实验结果表明,草酸二甲酯的空时收率与催化剂的活化温度、原料气的浓度及反应温度有关。通过对实验数据的关联,得到草酸二甲酯空时收率y DMO与原料气浓度的幂数型关系为: y DMO=k·C_(CO)~α·C_(MN)~β式中:α=1,β=2.5,k=3.26×10~4。C_(CO)·C_(MN)分别为CO和亚硝酸甲酯的浓度。
文摘A multiphase enzyme membrane reactor using aqueous organic biphase instead of water phase alone as the reaction medium was employed to investigate the lipase catalyzed synthesis of bioactive dipeptides. The medium effect on dipeptide yield was first studied. When N acetyl L phenylalanine ethyl ester(APEE) was used as a carboxyl component, the reactivity order of amino acid amides was found to be L Leu NH 2> L Val NH 2> L Ala NH 2> L Gly NH 2. The didpetide, N Ac L Phe L Leu NH 2, could be synthesized in the multiphase enzyme membrane reactor in a high yield and purity due to the simultaneous separation and reaction.
