From dried roots of angelica dahurica,nine compounds including eight liner furancoumarins were extracted,separated,and characterized by spectroscopic methods.
选取5A沸石分子筛作为脱碳吸附材料,考察了其对CO2及CH4单组份的吸附效果。结果表明,5A分子筛真空解吸在1 h 50 min即可达到解吸、脱碳、再生的目的,且经8次重复吸附-解吸后仍具有较高及较稳定的脱碳效率。将5A分子筛应用到沼气实际分...选取5A沸石分子筛作为脱碳吸附材料,考察了其对CO2及CH4单组份的吸附效果。结果表明,5A分子筛真空解吸在1 h 50 min即可达到解吸、脱碳、再生的目的,且经8次重复吸附-解吸后仍具有较高及较稳定的脱碳效率。将5A分子筛应用到沼气实际分离实验中,在沼气中n(CO2)∶n(CH4)=40∶60的条件下,经单塔处理可达0.17 m3/kg处理量,甲烷纯度可达97%以上,且连续处理速率为0.60 m3/(h·kg),该研究为今后的沼气分离工程提供了技术参数。展开更多
In the synthesis N-chiral quaternary ammonium salts from(2S)-N-benzyl-N-methyl-L-tyrosine methyl ester and(3S)-N-methyl-1,2,3,4-tetrahydro-isoquinoline-3-carboxylic acid methyl ester,a substitution occur even with 1.0...In the synthesis N-chiral quaternary ammonium salts from(2S)-N-benzyl-N-methyl-L-tyrosine methyl ester and(3S)-N-methyl-1,2,3,4-tetrahydro-isoquinoline-3-carboxylic acid methyl ester,a substitution occur even with 1.0 eq allyl bromide.That is the benzyl and methyl are removed respectively,and two allyl are attatched,and the compounds are analyzed and characterized by IR,1H NMR,13C NMR and MS methods.展开更多
文摘From dried roots of angelica dahurica,nine compounds including eight liner furancoumarins were extracted,separated,and characterized by spectroscopic methods.
文摘In the synthesis N-chiral quaternary ammonium salts from(2S)-N-benzyl-N-methyl-L-tyrosine methyl ester and(3S)-N-methyl-1,2,3,4-tetrahydro-isoquinoline-3-carboxylic acid methyl ester,a substitution occur even with 1.0 eq allyl bromide.That is the benzyl and methyl are removed respectively,and two allyl are attatched,and the compounds are analyzed and characterized by IR,1H NMR,13C NMR and MS methods.
