The complex of ZnCl2 with DL-alanine,Zn（Ala）2Cl2·1/2H2O,was synthesized and characterized by IR,thermogravimatric analysis and chemical analysis.The molar dissolution enthalpies of the reactants and the product...The complex of ZnCl2 with DL-alanine,Zn（Ala）2Cl2·1/2H2O,was synthesized and characterized by IR,thermogravimatric analysis and chemical analysis.The molar dissolution enthalpies of the reactants and the product were determined in H2O by classical solution calorimetry.By designing a themochemical cycle,the reaction enthalpy of zinc chloride with DL-alanine,ΔrH○-m（298.15k）=-38.95kJ.mol-1,and the standard formation enthalpy of Zn（Ala）2Cl2·1/2H2O,ΔfHθm[Zn（Ala）2Cl2·1/2H2O,s,298.15k]=-1347.32kJ.mol-1,were calculated.展开更多
The glycyrrhizic acid in glycyrrhiza leaching liquid was extracted by aqueous two-phase system.The orthogonal design is applied to investigate the effects of the process conditions on the recovery of glycyrrhizic acid...The glycyrrhizic acid in glycyrrhiza leaching liquid was extracted by aqueous two-phase system.The orthogonal design is applied to investigate the effects of the process conditions on the recovery of glycyrrhizic acid.Under the selected conditions,the PEG molecular mass was 2000,the ratio of leaching liquid to extractant was 1∶2 and the ratio of PEG to （NH4）2SO4 was 1∶1,the distribution coefficient of glycyrrhizic acid between top and bottom phase was 11.8 and the recovery of glycyrrhizic acid from glycyrrhiza leaching liquid was about 92.2%.展开更多
文摘The complex of ZnCl2 with DL-alanine,Zn（Ala）2Cl2·1/2H2O,was synthesized and characterized by IR,thermogravimatric analysis and chemical analysis.The molar dissolution enthalpies of the reactants and the product were determined in H2O by classical solution calorimetry.By designing a themochemical cycle,the reaction enthalpy of zinc chloride with DL-alanine,ΔrH○-m（298.15k）=-38.95kJ.mol-1,and the standard formation enthalpy of Zn（Ala）2Cl2·1/2H2O,ΔfHθm[Zn（Ala）2Cl2·1/2H2O,s,298.15k]=-1347.32kJ.mol-1,were calculated.
文摘The glycyrrhizic acid in glycyrrhiza leaching liquid was extracted by aqueous two-phase system.The orthogonal design is applied to investigate the effects of the process conditions on the recovery of glycyrrhizic acid.Under the selected conditions,the PEG molecular mass was 2000,the ratio of leaching liquid to extractant was 1∶2 and the ratio of PEG to （NH4）2SO4 was 1∶1,the distribution coefficient of glycyrrhizic acid between top and bottom phase was 11.8 and the recovery of glycyrrhizic acid from glycyrrhiza leaching liquid was about 92.2%.
