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制备型高效液相色谱法分离纯化绿原酸
绿原酸 高效液相制备色谱 纯化 流速梯度洗脱
2009/8/25
采用制备高效液相色谱技术,从杜仲叶提取物中分离纯化得到高纯活性成分绿原酸。对制备色谱的洗脱方式、洗脱剂组成、浓度、洗脱速度等参数进行优化,提出并应用了流动相速度梯度洗脱方法。最佳操作条件为:采用流速梯度进行洗脱,流速先为28 mL/min,然后为45 mL/min;流动相为15%的有机酸B和0.1%的有机酸E(体积分数);测定波长为254 nm;进样体积为10 mL;进样量为2 500 mg。通过...
电导法测量新型旋风分离器内液膜的分布规律
新型旋风分离器 电导法
2009/7/24
根据电导率变化原理设计了双平行电导探针，并采用该探针对新型旋风分离器内的液膜分布进行了研究。通过对不同结构参数和操作条件的研究发现，液膜沿筒体呈不对称分布，入口附近截面上的液膜随着轴向距离的增大其最厚值点沿圆周后移，液膜呈螺旋带状下行;发展后的液膜厚度在不同截面的最大值在160°左右的圆周角度处。研究还表明，随着处理负荷的增加，切向速度增大，液膜的分布区域变大，有利于分离效率的提高，但整体液膜厚度...
改性活性炭脱除二氧化碳中的微量苯
二氧化碳 改性活性炭
2009/7/24
将工业废气中的CO2回收利用，使之变废为宝具有重要的意义。研究了活性炭(AC)分别经湿氧化和N2还原改性后对苯吸附性能，并测定了改性活性炭的孔结构和表面官能团。结果表明，AC经N2还原改性能增大其比表面积，减少表面含氧官能团，增强其表面非极性，有利于苯的吸附。孔径分布是影响苯吸附的主要因素，吸附剂的孔径分布在0.6nm范围内时,有利于对苯的吸附。
ANALYTICAL TREATMENT OF MIXED CONVECTION FLOW PAST VERTICAL FLAT PLATE
mixed convection flat plate temperature optimal homotopy asymptotic method
2010/10/9
The problem of steady incompressible mixed convection flow past vertical flat plate has been considered. The velocity and temperature equations for this problem are reduced to set of non-linear ordina...
In reversed-phase high performance liquid chromatography (RP-HPLC), the mobile phase condition for separating eight isoflavones (daidzin, glycitin, genistin, 6′-o-acetyl daidzin, 6′-o-malonyl genisti...
A new kind of electrophoretic affinity chromatography (EAC) for bioseparation was proposed,Separation by EAC was conducted in a multicompartment electrolyzer in which the affinity gel media were pac...
insoluble matter (TIM) in coker heavy gas oil (CHGO) from oil sands bitumen is harmful to the downstream hydrotreating, and it may be difficult to be removed by conventional filtration. In order to ...
The separation characteristics of the PVA-CS (polyvinyl alcohol-chitosan) blended composite membrane for dehydration of ethanol-water mixture are examined. The relationships of flux and separation f...
The enhancement of chemical absorption of CO2 by K2CO3/H2O absorbents in the presence of activated carbon (AC) particles was investigated. The results show that the gas absorption rates can be enhance...
基于非负频谱分解的厂级多重振荡源的分离研究
process monitoring multiple oscillations non-negative matrix factorization
2009/3/9
Constrained spectral non-negative matrix factorization (NMF) analysis of perturbed oscillatory process control loop variable data is performed for the isolation of multiple plant-wide oscillatory so...
牛奶中分离的乳酸菌CGMCC1306中谷氨酸脱羧酶的分离纯化及酶学性质研究
Lactobacillus brevis glutamate decarboxylase purification
2009/3/4
A Lactobacillus brevis CGMCC 1306 isolated from fresh milk without pasteurization was found to have higher glutamate decarboxylase (GAD) activity. An effective isolation and purification procedure of ...
Separation of erucic acid from rape-seed oil using supercritical carbon dioxide with entrainer was carried on a pilot column with an inner diameter 14 mm and an effective total height 2.2 m. Experimen...
A pharmacological interaction target (PIT) method for solving the difficult problem in the separation of taxol from cephalonmanine was proposed. A two-phase extraction technique was used to carry out ...