Controlled Atmosphere Systems for Marine Vessels

1995 ◽  
Vol 32 (02) ◽  
pp. 147-150
Author(s):  
Mike Harrison ◽  
Peter Herlihy
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Natural Extension ◽  
Fruit And Vegetables ◽  
Air Separation ◽  
Controlled Atmosphere ◽  
Fiber Membrane ◽  
Cut Flowers ◽  
Low Oxygen ◽  
Chemical Company

Controlled atmosphere (CA) preservation of perishable fruit and vegetables represents new opportunities for today's reefer operators. This technology affords the carrier an efficient and economical method of introducing and maintaining a low oxygen atmosphere that, when used in conjunction with temperature control, can significantly enhance the preservation of fruit and vegetables. Improved product quality, new markets, and reduced product losses are benefits realized through the use of hollow fiber membrane air separation technology. Seasonal products, which may be unavailable because of the transit time of shipping, are now a reality for operators utilizing this technology. High-value products such as fresh cut flowers, previously dedicated to air freight, may be a natural extension of the technology. The authors' company is a wholly owned subsidiary of The Dow Chemical Company. Generon supplies hollow fiber membrane systems for the on-site generation of gaseous nitrogen. In 1992 the company provided turnkey design and installation services of controlled atmosphere systems for three fully refrigerated containerships operated by the Great White Fleet. These ABS-classed vessels were the first of their type to fully utilize controlled atmosphere technology for the improved quality and reduction of perishable losses.

Simulation and sensitivity analysis of transport in asymmetric hollow fiber membrane permeators for air separation

RSC Advances ◽  
2015 ◽  
Vol 5 (105) ◽  
pp. 86359-86370 ◽  
Author(s):  
Seyed Saeid Hosseini ◽  
Sara Najari ◽  
Prodip K. Kundu ◽  
Nicolas R. Tan ◽  
Seyed Mehrdad Roodashti
Keyword(s):  
Sensitivity Analysis ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Air Separation ◽  
Fiber Membrane ◽  
Operational Conditions ◽  
Separation Membrane

Development of advanced membranes requires deep insights about the process. Sensitivity analysis is performed to analyze the effects of module properties and process operational conditions on the performance of air separation membrane permeators.

Fabrication of Hollow Fiber Membrane from Polyarylate–Polyarylate Block Copolymer for Air Separation

2018 ◽  
Vol 58 (4) ◽  
pp. 289-295 ◽  
Author(s):  
M. V. Ivanov ◽  
I. P. Storozhuk ◽  
G. A. Dibrov ◽  
M. P. Semyashkin ◽  
N. G. Pavlukovich ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Air Separation ◽  
Fiber Membrane

Effects of Feed Pressure and Retentate Flow Rate on the Performance of Locally Developed Polysulfone Membrane Oxygen Enrichment System

2012 ◽  
Author(s):  
Ahmad Fauzi Ismail ◽  
Chin Yin Tan ◽  
Fook Kiong Chan
Keyword(s):  
Flow Rate ◽  
Hollow Fiber ◽  
Capital Investment ◽  
Hollow Fiber Membrane ◽  
Membrane System ◽  
Oxygen Enrichment ◽  
Air Separation ◽  
Fiber Membrane ◽  
Polysulfone Membrane ◽  
Feed Pressure

Pengkayaan oksigen daripada udara persekitaran dengan menggunakan teknologi membran diterima secara meluas di seluruh dunia sebagai teknologi alternatif kepada kaedah konvensional seperti penjerapan ayunan tekanan dan sistem kriogenik. Pemisahan udara menggunakan membran adalah proses yang lebih anjal di mana ia memerlukan pelaburan modal yang rendah, kaedah operasi yang mudah dan murah jika dibandingkan dengan kaedah konvensional. Kajian dan pengujian telah dijalankan ke atas sistem membran gentian geronggang polisulfona, di mana kesan tekanan suapan dan kadar alir baki dikaji. Pada kadar alir malar, pengkayaan telapan meningkat dan kemudian menurun dengan peningkatan tekanan disebabkan oleh kesan perbezaan tekanan merentasi membran mempengaruhi kebolehtelapan lapisan kulit. Manakala pada tekanan suapan malar, nilai pengkayaan telapan maksimum dicapai pada kadar alir maksimum disebabkan oleh peningkatan rintangan penelapan. Nilai maksimum ketulenan telapan oksigen yang diperolehi dalam uji kaji ini ialah 27.2%. Kata kunci: Pemisahan udara; membran gentian geronggang; pengkayaan oksigen; kebolehtelapan; polisulfona Oxygen enrichment from surrounding air by using membrane is gaining wide acceptance through out the world today as an alternative to the conventional methods such as pressure swing adsorption and cryogenic system. Air separation using membrane is a more flexible process that requires lower capital investment and simple operation. Studies and testing had been performed on a locally new developed polysulfone hollow fiber membrane system, where effects of feed pressure and retentate flow rate on the oxygen enrichment were observed. At constant retentate flow rate, permeate enrichment increased and then decreased with pressure due to the effect of pressure difference across the membrane, which affects the permeability of the skin layer. While at constant pressure, the highest permeate enrichment value was obtained at highest retentate flow rate due to the increase of permeation resistance. The highest oxygen purity obtained in this experiment was 27.2% and the O2 permeate enrichment was 1.295. Key words: Air separation; hollow fiber membrane; oxygen enrichment; permeability; polysulfone

scholarly journals Enhancing Oxygen Permeation via the Incorporation of Silver Inside Perovskite Oxide Membranes

Processes ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 199 ◽  
Author(s):  
Teng Ma ◽  
Ning Han ◽  
Bo Meng ◽  
Naitao Yang ◽  
Zhonghua Zhu ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Clean Energy ◽  
Ceramic Membranes ◽  
Operating Conditions ◽  
Air Separation ◽  
Perovskite Oxide ◽  
Fiber Membrane ◽  
Ion Conducting ◽  
Oxide Membranes

As a possible novel cost-effective method for oxygen production from air separation, ion-conducting ceramic membranes are becoming a hot research topic due to their potentials in clean energy and environmental processes. Oxygen separation via these ion-conducting membranes is completed via the bulk diffusion and surface reactions with a typical example of perovskite oxide membranes. To improve the membrane performance, silver (Ag) deposition on the membrane surface as the catalyst is a good strategy. However, the conventional silver coating method has the problem of particle aggregation, which severely lowers the catalytic efficiency. In this work, the perovskite oxide La0.8Ca0.2Fe0.94O3−a (LCF) and silver (5% by mole) composite (LCFA) as the membrane starting material was synthesized using one-pot method via the wet complexation where the metal and silver elements were sourced from their respective nitrate salts. LCFA hollow fiber membrane was prepared and comparatively investigated for air separation together with pure LCF hollow fiber membrane. Operated from 800 to 950 °C under sweep gas mode, the pure LCF membrane displayed the fluxes from 0.04 to 0.54 mL min−1 cm−2. Compared to pure LCF, under similar operating conditions, the flux of LCFA membrane was improved by 160%.

Simulation of Oxygen Permeability of Dual-phase Hollow Fiber Membrane

2012 ◽  
Vol 27 (9) ◽  
pp. 951-955
Author(s):  
Chun-Li YANG ◽  
Qi-Ming XU ◽  
Ming GONG ◽  
Wei LIU
Keyword(s):  
Hollow Fiber ◽  
Oxygen Permeability ◽  
Hollow Fiber Membrane ◽  
Dual Phase ◽  
Fiber Membrane
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