A STUDY ON TWO-PHASE FLOW CHARACTERISTICS IN PULSED SIEVE PLATE COLUMN FOR LIQUID-LIQUID EXTRACTION

In a previous investigation in 1963 Wang and Shen et al,found that the well known flow equationfor pulsed sieve plate column given by J.D.Thornton should be modified and written asV_s=V_d/X V_c/(1-x)=V_0(1-x)~nThis paper is a continuation of the previous works.Four kinds of liquid-liquid system were examinedin this study.The parameters n and V_o,the Sauter mean diameter of dispersed droplets D_(3.2) arc corro-leted in terms of physical properties of the systems and operation variables.Calculated flooding veloci-ties are close to the experimental values with deviation within ±15%.     

AXIAL MIXING OF CONTINUOUS PHASE IN A ROTATINGDISC EXTRACTION COLUMN(RDC)

1 .Indroduetion Axial mixing reduces tlle driving foree of mass transfer and the plate effieieney of Columnused for mass transfer oPeration.Its effeet on the design and Performanee of RDC hasattraeted the attention of many researeh workers 50 that a numbe…     

HYDRODYNAMICS AND MASS TRANSFER IN A NEW TYPE (FG) STACK PACKED EXTRACTION COLUMN

1 INTRODUCTIONOne of the major objectives in the study of extraction column is to minimize column di-mensions to fulfill a certain specific separation process.This has led to the intensiveemployment of structured packings in extraction columns [1].One of the recentdevelopments targeted for greater interfacial areas without excessive dispersion is the useof structure packings contactive claiming advantages,such as lower fluid flow friction     

LIQUID-LIQUID EXTRACTION OF Pa(V) AND Zr(IV) BY MIXTURES OF A β-DIKETOHE AND A SULPHOXIDE FROM HTDROCHLORIC ACID MEDIA

The species involved in the solvent extraction of zirconium(IV) from hydrochloric acid medium by mixtures of thenoyltrifluoroacetone (HTTA) and dipentyl sulphoxlde (DPSO) in benzene as the diluent seems to be Zr(OH) ₂(TTA)₂(DPSO). Extraction of protactinium(V) by mixtures of HTTA and DPSO exhibits synergism but the extent of synergism is not very appreciable.     

STUDY ON LIQUID PHASE MIXING IN PACKED COLUMN (Ⅱ) A TWO-DIMENSIONAL MODEL

A two-dimensional model involving both radial and axial mixing under the condition of steady tracer injection from a point source is presented. The model parameters are estimated by the optimal method of nonlinear programming, using the two-dimensional RTD experimental data obtaincd in a 1m diameter packed column. Dimensionless equations for the evaluation of axial and radial Peeler numbers are regressed.     

STUDY ON LIQUID PHASE MIXING IN PACKED COLUMN (Ⅰ) A PSEUDO-ONE-DIMENSIONAL MODEL

A pseudo-one-dimensional model comprising different coaxial mixing is proposed for the study of the liquid phase mixing in packed column. The model parameters are estimated by the optimal method of nonlinear programming, and the equivalent mixing coefficient is regressed in the form of dimensionless equation.     

(二) IONAC A—935 FIG—3

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加氢反应器强度计算A—DA101(101—D)

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防粘氟涂料FT_(A—1)的应用

一、引言聚四氟乙烯(PTFE)是理想的耐高低温(-250～ 250℃范围内使用)、无毒、惰性的高分子材料。由于它的表面张力小(19达因/厘米)、与水接触角大(表1),作为防粘材料广泛应用于食品、医药及家庭器皿等的防粘层。     

The trigonal-bipyramidal [ReOI2(PPh3)2] — The first monomeric oxorhenium(IV) complex with monodentate ligands only

The reaction of cis-[Re^VO₂I(PPh₃)₂] with 2-(3,5-dimethylpyrazol-1-yl)benzothiazole (dbt) in ethanol led to the isolation of the trigonal-bipyramidal oxorhenium(IV) complex trans-[ReOI₂(PPh₃)₂] (1). The complex is the first example of a monomeric oxo complex of rhenium(IV). Complex 1 was characterized by FTIR, ¹H NMR, microanalysis and single crystal X-ray diffraction.     

RD—004(A)型氢分析仪的mA连接

南京分析仪器厂生产的RD—004(A)型氢分析器是以mV信号输出的。从实际使用情况看来,故障往往发生在那些附加的发讯装置上,诸如“走方波”、“毛刺多”、“不同步”等。为了避免上述故障,我们按图一所示的方式     

自制简易GB—4A型Cu~( )分析器过滤器

南京分析仪器厂生产的GB—4 A型Cu~( )分析器,在许多工厂的使用中普遍反映由于铜液中带有油污与杂质,使过滤器的清洗工作量很大,大悟化肥厂也如此。原有的过滤器几乎每天要清洗一次,如果三天不     

“福司太克斯”—C1137A(Phostex)介紹

一般介绍 1957年秋季、美国化学会上會经报告过两种新型杀螨剂,一个是益赛昻,另一个就是“福司太克斯”。这两种都是美国食品机械化学公司的新产品。“福司太克斯”(Phostex)是商品名,其試驗代号是C—1137A,化学名称是双一(二烷氧基硫代磷酸酯)二硫化物,烷基中乙基与异丙基之比为3∶1,化学成分式为C_9H_(22)O_4P_2S_4,分子量为384.48,根据这些数据可以推析其結构如下:     

投入产出模型的可分解性及求(I—A)~(-1)的探讨

讨论了投入产出模型可分解的判定及列昂惕夫逆阵的两种算法。     

C_5—C_9合成脂肪酸制 A—940氨基烘漆(阶段小结)

随着我国工业生产的飞跃发展,涂料需要量急速增长。但由于我国涂料工业还大量采用植物油为原料,使油漆发展受到一定的影响,因此,采用合成材料代替植物油(特别是食用油)生产油漆,是涂料工业当务之急,也是落实毛主席“备战、备荒、为人民”的伟大指示的需要。我厂广大职工遵照毛主席“综合利用大有作为”的教导,于去年四月试用广州市油脂化工厂的副产物 C_5—C_9合成脂肪酸代植物油生产氨基烘漆。经过数十次的试验和改进,最近已选定较好的配方进行车间试产,经成漆交与用户使用鉴     

The First Combined Thermal Desorption Aerosol Gas Chromatograph—Aerosol Mass Spectrometer (TAG-AMS)

To address the critical need for improving the chemical characterization of the organic composition of ambient particulate matter, we introduce a combined thermal desorption aerosol gas chromatograph—aerosol mass spectrometer (TAG-AMS). The TAG system provides in-situ speciation of organic chemicals in ambient aerosol particles with hourly time resolution for marker compounds indicative of sources and transformation processes. However, by itself the TAG cannot separate by particle size and it typically speciates and quantifies only a fraction of the organic aerosol (OA) mass. The AMS is a real-time, in-situ instrument that provides quantitative size distributions and mass loadings for ambient fine OA and major inorganic fractions; however, by itself the AMS has limited ability for identification of individual organic compounds due to the electron impact ionization detection scheme used without prior molecular separation.

The combined TAG-AMS system provides real-time detection by AMS followed by semicontinuous analysis of the TAG sample that was acquired during AMS operation, achieving simultaneous and complementary measurements of quantitative organic mass loading and detailed organic speciation. We have employed a high-resolution time-of-flight mass spectrometer (HR-ToF-MS) to enable elemental-level determination of OA oxidation state as measured on the AMS, and to allow improved compound identification and separation of unresolved complex mixtures (UCM) measured on the TAG. The TAG-AMS interface has been developed as an upgrade for existing AMS systems. Such measurements will improve the identification of organic constituents of ambient aerosol and contribute to the ability of atmospheric chemistry models to predict ambient aerosol composition and loadings.

Copyright 2014 American Association for Aerosol Research     

DH—A(1)型塑料阻燃剂技术鉴定会在肇庆市召开

随着我国城市建设及旅游业的迅速发展,塑料建设材料越来越广泛地被使用(如玻璃钢冷却塔、玻璃钢瓦、游艇等)。但许多建筑材料由于没有添加阻燃剂而引起火灾,给国家造成不应有的损失。根据塑料材料易燃的特点,研究各种阻燃剂,已成为目前塑料工业发展的必须。肇庆市化工研究所根据资料调查,经过二年多的试验,研制成功一种阻燃效果好的DH—A(1)型塑料阻     

The chances of thermooxidation stabilization of poly(3-hydroxybutyrate) during processing–A critical evaluation

The performance of a series of thermooxidation stabilizers was investigated in poly(3-hydroxybutyrate) (PHB) during processing by multiple extrusion at 190°C. The issue was to find out if PHB may be processing stabilized or not. Phenols of different steric hindrance, phosphites, amine oxide, hydroxylamine, lactone, hindered amine and carbodiimide were tested as potential stabilizers and their efficiencies compared with non-stabilized polymer as a reference. Multiple extrusion data was evaluated using the processing degradation index (PDI) formerly designed for polypropylene. Changes in molecular weight were monitored as well. The results have shown that none of the stabilizing structures, currently successfully used in other polymers, have the ability to protect PHB. This indirectly implies that no radical chain scission takes place during PHB processing, i.e. no thermooxidation takes place. Moreover, nearly all of the tested structures act as prodegradants in PHB, some of them very strong. The strongest ones contain P or N atoms with asymmetrical free electron pairs in their molecules that evidently accelerate the main degradation mechanism of PHB—thermally induced cis-elimination.