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为了提高利福平的产品质量,对目前国内普遍使用的嗪工艺进行了研究与优化。直接以发酵液氧化萃取制得的利福霉素S为原料进行环合反应和缩合反应合成利福平,与以往的利福霉素S钠盐为原料相比,无需利福霉素S钠盐的结晶、分离、干燥及酸化过程,生产工艺更为简单。考察了环合反应温度和时间、缩合反应温度和时间、原料配比及相关的催化剂用量对利福平收率和纯度的影响。得到较优工艺条件为:环合反应温度为55℃,环合反应时间为1.5 h,V(N,N-二羟甲基叔丁胺)∶V(冰醋酸)∶m(抗坏血酸)∶m(利福霉素S)=0.278∶0.014∶0.014∶1.000,缩合反应温度为55℃,缩合反应时间为2 h,V(1-甲基-4-氨基哌嗪)∶m(利福霉素S)=0.463∶1.000,此时,利福平粗品的收率可达86.56%,纯度为92.69%。 相似文献
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The crystal morphology of zinc lactate trihydrate in the absence or presence of impurities (viz. succinic acid, L-malic acid and D-malic acid) is investigated by molecular simulation based on surface docking model and COMPASS force field. Combing simulation results with our previous experimental results, it is found that the solvent mainly has an inhibition effect on the (0 0 2) surface, and succinic acid impurity will inhibit the growth of (0 0 2) and (0 1 1) surfaces while two enantiomers of malic acid impurity will inhibit the (0 0 2) and (1 0 0) surfaces, which are in good agreement with the experimental results. 相似文献
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