K2CO3-Na2CO3-Li2CO3-H2O四元体系288K的相平衡

水盐体系;碳酸盐;溶解度;盐湖卤水;K2CO3-Na2CO3-Li2CO3-H2O四元体系288K的相平衡     

茵陈、白术挥发油-β-环糊精包合物的制备工艺研究

以挥发油的包合率和包合物收率为指标,考察制备茵陈、白术挥发油-β-环糊精(β-cyclodextrin,简称β-CD)包合物的饱和溶液法、研磨法、超声法,并采用正交设计优化研磨包合工艺,筛选出其最佳条件为:挥发油与β-CDA的投料比为1∶4,β-CD与加水量的比为1∶15倍,研磨时间40 min.该条件下的包合率为85.4%,包合物收得率为93.5%.结果表明,研磨法包合茵陈、白术挥发油的包合率和收得率较高,包合物性质稳定,而且包合前后挥发油成分一致.     

四元交互体系Li+，K+/CL-，CO2-3-H2O在298 K时相平衡及物理化学性质研究

Zabuye Saline Lake, Tibet, China, is unrivalled in the world for its very high salinity, in particular, for the very high concentration of ions of lithium, potassium, and boron in the brine. It belongs to alkaline and carbonate-borate-type salt lake. As a part of the study on phase equilibrium of the 6component subsystem Li+, Na+, K+/C1-, CO2-3, B4O2-7-H2O of the brine system, a study on the reciprocal quaternary system Li+, K+/C1-, CO32-H2O at 298 K was done with isothermal dissolution equilibrium method in the present work. The phase equilibrium of the reciprocal quaternary system Li+,K+/C1, CO2-3-H2O at 298 K was studied with isothermal dissolution method in this work. The physicochemistry properties of the corresponding equilibrium solutions such as densities, viscosities, refractive index, conductivities and pH value were determined. The dried salt diagram of the system consists of four crystallization fields (KC1, Li2CO3, LiCI·H2O, K2CO3·3/2H2O) and five isothermal solubility curves.There are no double slat or solid solution found. Pitzer′s model of the electrolyte solution theory was used for parameterization from the results of solubility determination for subsystems and the prediction of solubilities for the reciprocal quaternary system was made. The solubility data of the experiment are in agreement with those calculated.     

四元交互体系Li+,Na+//CO2-3,B4O72一-H2O 298 K相关系的理论预测及实验研究

采用三元体系的溶解度数据,运用多元线性回归法拟合了Li 2CO3(a),Na 2CO3(b),Li 2B4O7(c)的单盐参数、溶解平衡常数及有关的混合离子作用参数.它们的值分别为:β(o)a=-1.235 5,β(1)a=-2.654 6,Cφa=-0.004 660 7,β(0)b=-3.030 6,β(1)b=-3.023 8,Cφb=-0.290 89,β(0)c=-0.293 04,β(1)c=2.155 6,Cφc=-0.004 256 0,θLi,Na=1.041 8,θB.C=-2.630 5,ψLi,Na,C=-0.063 91,ψLi,Na,B=0.493 56,ψLi,B,C=-0.478 42,ΨNa,B,c=0.306 16,In K(Li2CO 3)=-8.962 9,In K(Na2CO3@10H2O)=3.064 6,ln K(Li2B4O 7@3H2O)=-7.356 6,ln K(Na2B4O7@10H2O)=-7.477 8.以盐的溶解平衡常数为判据,运用Pitzer方程计算了四元体系Li+,Na+//CO2-3,B4O2-7-H2O 298 K时的溶解度,并采用等温溶解平衡法,对该体系298 K时溶解度进行了实验测定,同计算值相比,二者基本吻合.     

Li+,K+/Cl-,CO32--H2O四元交互体系(298K)介稳相平衡的实验研究

我国西藏的扎布耶盐湖卤水以富含硼、锂、钾而闻名于世[1-2]。依据扎布耶盐湖卤水体系的主要成分,该卤水体系可简化Li K Na B4O72- CO32- Cl- SO42- H2O体系。针对西藏盐湖地处干旱、强日照特点,开展对扎布耶盐湖卤水体系的多温稳定及介稳相平衡研究,对于解释盐湖的演化及指     

Na~＋，K~＋‖Cl~－，B_4O_7~（－2）－H_2O四元体系25℃时相平衡研究

Ｎａ~＋，Ｋ~＋‖Ｃｌ~－，Ｂ_４Ｏ_７~（－２）－Ｈ_２Ｏ四元体系２５℃时相平衡研究阎树旺，唐明林，邓天龙（成都理工学院液态矿产综合利用研究室成都，６１００５９）关键词四硼酸钠，四硼酸钾，相平衡，卤水近年来，在四川盆地成都凹陷平落坝地区发现了富硼、钾、低?..     

A simple, universal theory and method for computer plotting of stable equilibrium phase diagrams of a multisystem——SFM method

A new easy method has been presented to calculate the variable intervals corresponding to the stable univariant curves and to discriminate the stabilities of invariant points. This method and the one reported previously constitute a simple and universal theory for the computer-plotting of the equilibrium phase diagrams of a multisystem——sign function matrix (SFM) discrimination method. Its main steps are: determining the stable univariant scheme according to the derivative (or difference) of △rGm; grouping the univariant curves by comparisons of the mutual relations among them; determining the existing intervals of the variables for the stable curves by comparisons of coordinate values of the curves about the invariant point; determining the stabilities of invariant points by comparisons of relations between the common curves and the invariant points. This method is suitable for any kind of phase diagram of closed or open systems in a phase diagram "space" with either 2 or more than 2 dimensions.     

纤维素酶预处理法提取郁金中姜黄素的研究

提出了纤维素酶预处理法提取郁金中姜黄素的新工艺。探讨了酶的用量、酶解时间、酶解pH值、酶解温度、提取次数、提取时间等因素对姜黄素提取率的影响。筛选出了最佳的单因素工艺条件为:每10g郁金粉纤维素酶的用量为180U、酶解时间120min、pH值3.5、温度50℃、提取次数2次、提取时间90min。与传统提取方法相比,该方法及其新工艺能显著提高姜黄素的提取率。     

四元交互体系Li~+,K~+/Cl~-,CO_3~(2-)-H_2O在298K时相平衡及物理化学性质研究

位于我国西藏腹地的扎布耶盐湖 ,是世界上罕见的富含锂、钾等碱金属和富含硼的碳酸盐 硼酸盐的特种盐湖 .该湖卤水主要由Ｌｉ+,Ｎａ+,Ｋ+,Ｃｌ- ,ＣＯ2 -3 ,ＳＯ2 -4 ,Ｂ4Ｏ2 -7,ＨＣＯ-3 等物种构成 .显然 ,开展该湖卤水体系的理论和实验相平衡研究 ,不仅对该种类型盐湖卤水的成因和成矿规律、对于这类复杂水盐体系化学行为的理论和实验描述研究具有重要意义 ,而且对于该盐湖卤水盐类资源综合利用方案的制定具有指导意义 .但是 ,迄今为止 ,除陈郁华[1 ] 报道过关于 2 98Ｋ条件下该湖卤水体系等温蒸发实验研究的结果外 ,尚未见到关于该湖卤…