N902煤油HCl反萃分散组合液膜迁移和分离铜

N902煤油HCl反萃分散组合液膜迁移和分离铜;反萃分散组合液膜;铜;N902;分离;迁移     

N530-OT-煤油-HCl反萃分散组合液膜体系迁移和分离铜的研究

The transport and separation of copper(Ⅱ) from waste water by a N₅₃₀-OT-kerosene-HCl strip dispersion hybrid liquid membrane system was studied. The influence of penetrant OT, N₅₃₀ concentration, pH in feed phase, membrane area, HCl concentration in stripping phase, and volume ratio of membrane phase to stripping phase on transport and separation were also investigated. The experiments demonstrate that Cu(Ⅱ) can be transported selectively from the binary Cu(Ⅱ) and Fe(Ⅲ) solution to stripping phase and that the transport percentage of Cu(Ⅱ) exceeds 93.8% and Fe(Ⅲ) is only 1.8% after transport of 6 hours.     

支撑液膜体系渗透系数和反萃液酸度的关系

A new permeability coefficient equation was theoretically derived. It contains both the acid concentration of feed solution and the carrier concentration as well as the acid concentration of stripping solution. The relationship of permeability coefficient and acid concentration of stripping solution was further confirmed by the experimental results of Co2+、Ni2+、 Er3+ ions transporting through the supported liquid membranes.     

反萃分散液膜分离提取黄连中生物碱研究

黄连是一种常用的中草药,具有清热燥湿、泻火解毒之功效,其主要的活性成分为多种异喹啉生物碱,包括药根碱、巴马汀、小檗碱等,这些生物碱具有抗菌、消炎和抗肿瘤等作用~([1～2]).因此,从黄连中提取这些生物碱具有重要意义.     

三正辛胺-仲辛醇-煤油组合液膜分离镉锌的研究

本文用萃取和膜迁移实验研究了镉、锌离子在三正辛胺-仲辛醇-煤油组合液膜体系中的迁移和分离的影响因素。实验证实,该组合液膜体系能从含镉、锌的料液中选择性地迁移镉,有效地实现镉、锌分离。理论分析表明,组合液膜的双固体膜可简化为具备两张固体膜厚度的单一固体支撑体的支撑液膜。测定了组合液膜因迁移而流失在料液相和反萃相中的三正辛胺含量,实验显示,组合液膜的两张固体支撑体可阻止三正辛胺的流失,增加膜稳定性,延长膜寿命。     

分散液液微萃取-反萃取-接受相固化-高效液相色谱法测定减肥茶中的西布曲明

建立了分散液液微萃取-反萃取-接受相固化与高效液相色谱联用测定减肥茶中西布曲明的方法。优化的条件为:400L石油醚为萃取剂、120L甲醇为分散剂、14L 0.2 mol/L HCl溶液和1L甲醇的混合溶液为接受相,萃取2 min。在优化条件下西布曲明的富集因子可达130倍。方法的线性范围为0.6～200g/L,检测出限为0.2g/L,定量限为0.6g/L。样品加标回收率介于91.9%～108.4%,日间相对标准偏差小于14%。     

分散支撑液膜中金属镍(Ⅱ)的迁移研究

研究了以聚偏氟乙烯膜(PVDF)为支撑体,煤油为膜溶剂,有机膦酸为流动载体的分散支撑液膜(DSLM)中金属Ni(Ⅱ)的传输行为;考察了载体种类、料液相pH、Ni(Ⅱ)起始浓度、分散相中H2SO4浓度以及膜溶液与H2SO4溶液体积比对Ni(Ⅱ)传输的影响,并对该体系富集、传输Ni(Ⅱ)的最佳条件进行了讨论;从界面化学和扩散传质角度提出了Ni(Ⅱ)在DSLM中传质动力学方程,采用直线斜率法对扩散层厚度以及金属离子在膜内的扩散系数进行了计算.     

中空纤维分散液膜富集稀土元素

采用2-乙基己基膦酸单-2-乙基己基酯(HEHEHP)-正庚烷为萃取剂,盐酸为反萃取剂,中空纤维膜作支撑膜,研究中空纤维分散液膜技术富集稀土镱(Yb~(3+))离子。考察了体系物性:反萃分散相中反萃剂浓度、萃取剂浓度、萃取剂与反萃剂体积比、料液相p H值、稀土离子浓度;流体流动状态:反萃分散相与料液相流速变化等因素对富集稀土离子的影响。中空纤维分散液膜富集Yb~(3+)的最佳条件为:萃取剂浓度为0.25 mol/L,反萃取剂HCl浓度为4.00 mol/L,萃取剂与反萃剂体积比为10∶40,料液相p H=2.80,稀土离子浓度为0.025 mol/L。反萃分散相体积流量和料液相体积流量较小时,萃取率随流量的增加呈现逐渐增大的趋势。若两相体积流量过大,反萃过程进行不完全,萃取率反而下降。研究结果表明,中空纤维分散液膜技术可实现稀土离子的有效富集。     

锌(Ⅱ)-芳香氮碱-氨基酸三元配合物中的配体间疏水缔合作用

用pH-电势法研究了锌(Ⅱ)-芳香氮碱(Ar)-氨基酸(Aa) 三元配合物在溶液中的稳定性,其中Ar为2,2'-联吡啶或1,10-邻菲咯啉,Aa为甘氨酸,丙氨酸,缬氨酸, 亮氨酸,苯丙氨酸和色氨酸,以稳定性数据为探针,结合^1H NMR谱的研究, 讨论了在上述某些三元配合物中可能发生的分子内配体间疏水缔合作用. 计算了这些配合物分子的异构化平衡常数及平衡时闭式分子的百分率.结果表明,在含有芳香侧基的氨基酸配体的三元配合物溶液中,闭式异构体已成为配合物的主要存在形式,初步研究了溶剂对配体间疏水缔合作用的影响     

溶液中非过渡金属混合配体配合物形成的热力学研究2:某些镉(Ⅱ)-联吡啶(邻菲咯啉)-氨基酸混配配合物中配体间疏水缔合作用的热力学

应用pH电位法测定水溶液中CdLA型混合配体配合物和相应的单配体配合物CdL,CdL~2,CdA,CdA~2在离子强度为(0.10(KNO~3)、温度分别为15℃, 25℃, 35℃和45℃时的稳定常数,其中L为联吡啶或邻菲咯啉;A为丙氨酸、亮氨酸、苯丙氨酸和色氨酸,稳定性数据结合配体的结构表明,在含有亮氨酸、苯丙氨酸和色氨酸的混配配合物中存在着按上述配体顺序逐渐增强的配合物分子内的配体间疏水缔合作用.用温度系数法求出上述混配配合物形成反应的焓变ΔH,并进一步求出反应的自由能变化ΔG 和熵变ΔS.热力学函数数据表明,较大的熵增加是上述混配配合物中配体间疏水缔合作用的主要推动力.     

Chiral Discrimination of Amino Acids by an Optically Active Crown Ether Studied by HPLC, Extraction and a Liquid Membrane Transport Experiments

A chiral crown ether incorporating a methyl -d-mannopyranoside unit displayed pronounced enantioselection of amino acids in partition liquid chromatography experiments involving solvent systems of limited miscibility: water–ethanol–2,2,4-trimethylpentane. The same system has been used for amino acid transport across a liquid membrane containing the crown ether, and in liquid–liquid extraction experiments. Remarkable enantioselection has been noted for amino acids in all the processes studied.     

Liquid Membrane Transport Behavior of Functional Substituted Crown Ethers for Amino Acids

Crown compounds offer a variety of interesting functions based on their specific bindings of organic guest species1,2. In particular, they can act as carriers in ion- extraction, membrane transport, and phase-transfer reactions. In contrast to the large variety of synthetic ionophores for cation transport, there are only a few examples of synthetic anion transport ionophores. Therefore, it appears highly desirable to search for a new class of ionophores with excellent transport abilities fo…     

Enantiomeric Separation of Non-Protein Amino Acids by Chiral Ligand-Exchange High-Performance Liquid Chromatography

Abstract

The enantiomeric separation by high-performance liquid chromatography of underivatized non-protein amino acids was investigated by using a column packed with octadecylsilanized silica coated with N,S-dioctyl-D-penicillamine as a chiral ligand-exchange phase (Sumichiral OA-5000). Excellent to good separations of enantiomers were achieved with a variety of nonprotein amino acids carrying aliphatic or aromatic side-chains by optimizing the amount (0-20%, v/v) of the organic component (2-propanol) and the concentration (1-5 mM) of the complexing metal ion (Cu²⁺) in the hydro-organic eluent.     

Ionic Liquid Crystals Derived from Amino Acids

Novel chiral amino acid derived ionic liquid crystals with amine and amide moieties as spacers between the imidazolium head group and the alkyl chain were synthesised. The key step in the synthesis utilised the relatively uncommon SO₃ leaving group in a microwave‐assisted reaction. The mesomorphic properties of the mesogens were determined by differential scanning calorimetry (DSC), polarising optical microscopy (POM) and X‐ray diffraction. All liquid crystalline salts exhibit a smectic A mesophase geometry with strongly interdigitated bilayer structures. An increase of the steric bulk of the stereogenic centre hindered the formation of mesophases. In case of phenylalanine‐derived derivatives a mesomorphic behaviour was observed for shorter alkyl chains as compared to other amino acid derivatives indicating an additional stabilising effect by the phenyl moiety.     

苯基异硫氰酸酯衍生氨基酸的高效液相色谱分析

苯基异硫氰酸酯衍生氨基酸的高效液相色谱分析杨扬,秦强,郭伟忠（江苏石油化工学院应化系常州２１３０１６）１前言采用苯基异硫氰酸酯（ＰＩＴＣ）衍生氨基酸并用高效液相色谱测定的报道国外较多￣［１－４］。该法的优点是ＰＩＴＣ与氨基酸、亚氨基酸都能反应生成ＰＴ...     

高效液相色谱法测定羊水中兴奋性氨基酸、抑制性氨基酸的含量

建立了反相高效液相色谱法测定羊水中兴奋性氨基酸天门冬氨酸、谷氨酸,抑制性氨基酸甘氨酸含量的方法,色谱柱为LUNAC18柱(4.6mm×250mm,5μm),流动相为乙腈水(V/V),按低压梯度洗脱,梯度系统0～4min,乙腈40%;4～20min,乙腈40%～52%;20～30min,乙腈52%～60%;30～40min,乙腈60%～40%。流速0.8mL/min,柱温40℃,紫外检测波长260nm;进样量10μL。结果显示,天门冬氨酸、谷氨酸和甘氨酸三者的线性范围均为2.5～85mg/L;标准加入的回收率为99.6%～102.6%。本方法灵敏度高、测定结果可靠。用本方法对201例不同孕期的羊水作兴奋性和抑制性氨基酸检测,发现羊水中3种氨基酸随妊娠进展而增加的趋势,胎儿畸形或宫内缺氧时羊水中这3种氨基酸水平明显升高。     

Separation of Enantiomers of Non-Protein Amino Acids by High-Performance Liquid Chromatography on a Chiral Ligand-Exchange Column

The HPLC separation of enantiomers of underivatized non-protein amino acids was investigated by using a column packed with octadecylsilanized silica coated with N,S-dioctyl-D-penicillamine as a chiral ligand-exchange phase (Sumichiral OA-5000). Good enantiomeric separations were achieved with a variety of -amino acids carrying aliphatic or aromatic side chains, cyclic imino acids, and -amino acids, together with -methyl--amino acids, by optimizing the amount (0–20%, v/v) of 2-propanol as the organic component and the concentration (1–5 mM) of Cu²⁺ as the complexing metal ion in the aqueous-organic eluent.     

Separation of Trivalent Samarium through Facilitated Stripping Dispersion Hollow Fiber Liquid Membrane Using p204 as Mobile Carrier

The separation of Sm(III) through stripping dispersion hollow fiber liquid membrane system (SDHFLM) containing feed phase adding acetate buffer solution and dispersion solution with HCl solution as the stripping solution and membrane solution of di(2‐ethylhexyl) phosphoric acid (p204) dissolved in kerosene, has been studied. A set of factors were studied, including pH value, initial concentration of Sm(III) and different ionic strength of feed phase, volume ratio of membrane solution and stripping solution (O/W), HCl concentration, carrier concentration, different stripping agents of dispersion phase on Sm(III) separation. Experimental results indicate that the optimum separation conditions of Sm(III) were obtained as that HCl concentration was 4.00 mol/L, p204 concentration was 0.150 mol/L, and volume ratio of membrane solution and stripping solution (O/W) was 1.00 in the dispersion phase, and pH value was 4.60 in the feed phase. Ionic strength had no obvious effect on separation of Sm(III). When initial Sm(III) concentration was 1.00×10^?4 mol/L, the separation rate of Sm(III) was up to 93.5% in 85 min. The kinetic equation was developed in terms of the law of mass diffusion and the theory of interface chemistry. The modeled results were in good agreement with the experiment data.