Gas Separation & Purification最新文献_第6页

Investigation and improvement of cryogenic adsorption purification of argon from oxygen 低温吸附净化氧中氩的研究与改进

Gas Separation & Purification Pub Date : 1995-06-01 DOI: 10.1016/0950-4214(95)93951-F

A.N. Fedorov

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引用次数: 3

Preparation and air-separation properties of membrane blends of low-molecular-weight liquid crystals with cellulose derivatives 低分子液晶与纤维素衍生物共混膜的制备及空分性能

Gas Separation & Purification Pub Date : 1995-06-01 DOI: 10.1016/0950-4214(95)93945-G

Mei-Rong Huang, Xin-Gui Li

{"title":"Preparation and air-separation properties of membrane blends of low-molecular-weight liquid crystals with cellulose derivatives","authors":"Mei-Rong Huang, Xin-Gui Li","doi":"10.1016/0950-4214(95)93945-G","DOIUrl":"10.1016/0950-4214(95)93945-G","url":null,"abstract":"<div>Four kinds of low-molecular-weight liquid crystals (LCs) (cholesteryl oleyl carbonate (COC), the benzoate-containing mixture LC DYC, p-heptyl-p′-cyanobiphenyl (7CB), p-pentylphenol-p′-methoxybenzoate (5PMB) and four cellulose derivatives (ethyl cellulose (EC), cellulose diacetate, cellulose triacetate, cellulose nitrate) were used to prepare blend membranes of thickness 13–45 μm by a solution casting technique. The oxygen permeability, the oxygen/nitrogen separation factor, the permeation flux QOEA and the oxygen concentration YO2 of the oxygen-enriched air (OEA) through the cellulose derivative membranes with different LCs were studied by a constant pressure-variable volume method. The experimental results show that the membrane-forming ability, uniformity, toughness and air-separation properties of the cellulose derivatives have been improved by adding no more than 12 wt% LC. The air-separation properties of the resulting membranes vary significantly with membrane composition, temperature and pressure difference. Of all the membranes, the COC/EC(4/96) membrane of thickness 18 μm exhibits the highest QOEA value of 1.8 × 10−4 cm3(STP) s−1 cm−2 and maintains the YO2 value of 38.8% in a single operation.</div>","PeriodicalId":12586,"journal":{"name":"Gas Separation & Purification","volume":"9 2","pages":"Pages 87-92"},"PeriodicalIF":0.0,"publicationDate":"1995-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0950-4214(95)93945-G","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78586258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Separation of binary, ternary and multicomponent organic/water mixtures 二元，三元和多组分有机/水混合物的分离

Gas Separation & Purification Pub Date : 1995-06-01 DOI: 10.1016/0950-4214(95)93943-E

Habib I. Shaban

{"title":"Separation of binary, ternary and multicomponent organic/water mixtures","authors":"Habib I. Shaban","doi":"10.1016/0950-4214(95)93943-E","DOIUrl":"10.1016/0950-4214(95)93943-E","url":null,"abstract":"<div>In this paper, the separation characteristics of polyvinyl alcohol membranes are compared for pervaporation of binary, ternary and multicomponent organic/water mixtures. The analyses were performed as a function of composition at steady-state operating conditions. Results are compared in terms of difference in permeation rate, separation factor, time taken for dehydration and temperature drop across the membrane for the three systems. The separation ability of the membrane is expressed in terms of permeation rate and selectivity. From the results, we found that the permeation rate increased and the separation factor decreased as the water concentration in the feed increased. Furthermore, we noted that the presence of one component affects the rate of transfer of the other. These results confirm that interaction between the feed, the permeate and the polymer plays an important role in pervaporation. For binary and ternary systems, permeate composition remains relatively constant over a wide range of feed concentrations, and, for the multicomponent system, water concentration in the permeate decreases as more alcohol molecules are sorbed into the membrane.</div>","PeriodicalId":12586,"journal":{"name":"Gas Separation & Purification","volume":"9 2","pages":"Pages 75-79"},"PeriodicalIF":0.0,"publicationDate":"1995-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0950-4214(95)93943-E","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73959699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Design correlations of an air-lift tube reactor 气升管式反应器的设计关系

Gas Separation & Purification Pub Date : 1995-06-01 DOI: 10.1016/0950-4214(95)93947-I

J.G. Majeed, E. Békásy-Molnár

{"title":"Design correlations of an air-lift tube reactor","authors":"J.G. Majeed, E. Békásy-Molnár","doi":"10.1016/0950-4214(95)93947-I","DOIUrl":"10.1016/0950-4214(95)93947-I","url":null,"abstract":"<div>Air-lift reactors are important gas-liquid contactors for gas separation, purification, fermentation and waste water treatment on account of their simple construction and low energy consumption together with high mass and heat transfer rates. Apart from the improved liquid mixing, air-lift reactors have no moving elements and the power requirement comes only from the air supply.A new air-lift tube (ALT)-type reactor was investigated in laboratory and pilot scale. A study was conducted to measure the effects of liquid properties (such as viscosity and density) on the hydrodynamics of the ALT reactor. The systems used for this study were: air/water, air/sodium hydroxide solution, air/sodium citrate buffer solution and air/glycerine. Pressure drop in the reaction tube, minimum and maximum gas velocities, pressure frequency and recycle liquid velocity in the recycle tube were measured under different experimental conditions using different tube diameters for the recycle and reaction tubes.Design correlations for the above-mentioned parameters were developed by computer program in order to design an ALT reactor for gas-liquid reactions. The correlations are valid in the range 0.1–1400 m3 h−1 of the gas stream.</div>","PeriodicalId":12586,"journal":{"name":"Gas Separation & Purification","volume":"9 2","pages":"Pages 101-109"},"PeriodicalIF":0.0,"publicationDate":"1995-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0950-4214(95)93947-I","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87522244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

A study of foaming and carry-over problems in oil and gas separators 油气分离器中起泡和结转问题的研究

Gas Separation & Purification Pub Date : 1995-06-01 DOI: 10.1016/0950-4214(95)93944-F

Habib. I. Shaban

引用次数: 23

Comparison of the efficiencies of sulfur dioxide absorption using calcium carbonate slurry and sodium hydroxide solution in an ALT reactor ALT反应器中碳酸钙浆和氢氧化钠溶液吸收二氧化硫效率的比较

Gas Separation & Purification Pub Date : 1995-06-01 DOI: 10.1016/0950-4214(95)93948-J

J.G. Majeed, B. Korda, E. Békássy-Molnár

引用次数: 13

A method to obtain a compact representation of process performances from a numerical simulator: example of pressure swing adsorption for pure hydrogen production 从数值模拟器获得过程性能的紧凑表示的方法:以纯氢生产的变压吸附为例

Gas Separation & Purification Pub Date : 1995-06-01 DOI: 10.1016/0950-4214(95)93950-O

M. Chlendi , D. Tondeur , F. Rolland

{"title":"A method to obtain a compact representation of process performances from a numerical simulator: example of pressure swing adsorption for pure hydrogen production","authors":"M. Chlendi , D. Tondeur , F. Rolland","doi":"10.1016/0950-4214(95)93950-O","DOIUrl":"10.1016/0950-4214(95)93950-O","url":null,"abstract":"<div>The purpose of this work is to propose a method of global characterization of the behaviour of pressure-swing-adsorption (PSA) cycles based on statistical experiments design, the ‘experiments’ being actually numerical (simulation). The result of that procedure presented here is a set of polynomials describing the performances of the PSA cycles (purity, yield, productivity) as functions of operating or design variables (flow rates, pressures, composition, bed length, step durations). These polynomials represent the sensitivity of the process to fluctuations, perturbations or intentional changes of process variables, and can be used, within their range of validity, as a fast aid to operators, and as a tool for design and optimization. The specific case investigated is a PSA cycle for pure hydrogen production from a mixture with CO2, CH4, CO and N2 obtained by cracking natural gas. The process comprises two adsorbent beds, each containing a zeolite layer on top of an active carbon layer.</div>","PeriodicalId":12586,"journal":{"name":"Gas Separation & Purification","volume":"9 2","pages":"Pages 125-135"},"PeriodicalIF":0.0,"publicationDate":"1995-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0950-4214(95)93950-O","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85642192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 24

The permeabilities of carbon dioxide, nitrous oxide and oxygen and their mixtures through silicone rubber and cellulose acetate membranes 二氧化碳，氧化亚氮和氧气及其混合物通过硅橡胶和醋酸纤维素膜的渗透性

Gas Separation & Purification Pub Date : 1995-01-01 DOI: 10.1016/0950-4214(95)92173-A

Ronald Hughes, Boquan Jiang

引用次数: 25

The behaviour of oil films on structured packing under cryogenic conditions 低温条件下结构填料上油膜的行为

Gas Separation & Purification Pub Date : 1995-01-01 DOI: 10.1016/0950-4214(95)92176-D

Anton Kirzinger, Karl Baur, Eberhard Lassmann

{"title":"The behaviour of oil films on structured packing under cryogenic conditions","authors":"Anton Kirzinger, Karl Baur, Eberhard Lassmann","doi":"10.1016/0950-4214(95)92176-D","DOIUrl":"10.1016/0950-4214(95)92176-D","url":null,"abstract":"<div>Today structured packing is commonly applied in cryogenic air separation plants. Packing is typically characterized by a high surface-to-volume ratio. Owing to the large surface of packing in comparison to common sieve trays — provided equal amounts of oil are attached to surfaces — more organic material may be present within a low-pressure column of an air separation plant. Since an enrichment of organic material in an air separation plant or in liquid oxygen is a principal hazard, and a major accumulation of organic material magnifies this risk, experimental tests were conducted to determine whether chipping of oil at cryogenic temperatures is possible.Tests are discussed where single sheets of a packing segment had been coated with an oil film of definite thickness. The oil-coated sheets were rinsed by moving them up and down in liquid nitrogen or in liquid oxygen. After fixed time intervals the oil content of a single sheet was determined.It was concluded that the original oil residue on the sheets up to 250 mg m−2 remained attached to the packing surface and no decrease of oil was found within the accuracy of the oil determination method.</div>","PeriodicalId":12586,"journal":{"name":"Gas Separation & Purification","volume":"9 1","pages":"Pages 45-48"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0950-4214(95)92176-D","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88583162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Biomedical use 生物医学应用

Gas Separation & Purification Pub Date : 1995-01-01 DOI: 10.1016/S0950-4214(95)80001-8

引用次数: 0