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通过考察硝酸硫胺重结晶过程中的各关键组分的浓度变化 ,建立了硝酸硫胺的溶解度模型 ,模型预测结果与实验结果吻合很好 .该模型的建立对于研究结晶过程中的成核和晶体成长过程具有重要意义 ,也为类似的沉淀结晶过程提供了一种研究方法 相似文献
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Dilutionisonekindofcrystallizationsthatiswidelyusedintheproductionofpharmaceuticals ,especiallyantibi otics.Dilutionhasmanyadvantagessuchashigherthrough putsbypreparingveryconcentratedinitialsolutions,loweroperatingtemperatureforheat labilesubstancesandbetterpu rificationasthemotherliquorretainsundesiredimpurities[1] .Oneofthecharacteristicsofdilutionisthatthesolventcom positionvarysastheprocessproceeds.Thesolventcomposi tionhasinfluenceonnotonlythenucleationratebutalsotherelativegrowthrateofe… 相似文献
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The metastable state and nucleation kinetics of clindamycin phosphate （CP） in cooling crystallization were studied by metastable zone width （MZW） method and induction time method. By correlating the MZW experi- mental results with temperature, agitation rate and cooling rate, it is found that the correlation result shows good agreement with the change trend of MZW. The critical nucleation parameters were evaluated based on the classical theory of nucleation; both the interfacial tension and the radius of critical nucleus increased with the decrease of rela- tive supersaturation. The effect of supersaturation on the nucleation rate was analyzed. It is indicated that the new phase formation of CP is governed by mononuclear mechanism. 相似文献
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Ionizationconstantsofpolyproticweakacidsarebasicthermodynamicsdata .Undermanycircumstances ,measurementsofionizationconstantsofpolyproticweakacidsareroutinelynecessary ,e .g .,fornewcompounds ,forwell establishedcompoundsatagiventemperaturewherepreviousdataareunavailable,andindifferentsol ventsystems.ThemainmethodsfordeterminationofionizationconstantsreportedinRefs.[1]— [4 ]arecon ductometricmethod ,potentiometrictitrationmethod ,NMRmethodandspectrophotometricmethod .Inthispaper,anewmethodf… 相似文献
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本文介绍了天津大学化学工程与工艺本科专业开展英国化学工程师学会(简称IChemE)国际认证和中国工程教育认证协会(简称认证协会)国内认证多年的实践过程,从专业认证的标准、课程体系要求、自评报告的撰写、认证的程序等多方面进行了比较和解读,深入探讨和分析了国际认证与国内认证的"实质等效"性。表明我国的工程教育认证工作,已经与国际认证体系接轨,二者具有"实质等效"性。 相似文献
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Erythromycinis a mixture of macrolide antibiotics pro-duced bystreptomyces erythreus.Treatment withthis antibi-otic drugin humanand veterinary practiceis still verycom-mon because of the highactivityagainst gram-positive and afewgram-negative strains[1]. … 相似文献
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发展绿色化学化工是人类社会可持续发展的根本保证。根据《国家中长期教育改革和发展规划纲要(2010—2020年)》,我国提出在高等学校实施"卓越工程师教育培养计划",加速建设绿色化学化工特色专业,为我国创新型国家的建设以及绿色经济发展培养绿色化学化工人才。 相似文献
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