scholarly journals High-Pressure Aging of Asymmetric Torlon® Hollow Fibers for Helium Separation from Natural Gas

Fibers ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 83 ◽  
Author(s):  
George Dibrov ◽  
Mikhail Ivanov ◽  
Mikhail Semyashkin ◽  
Vladislav Sudin ◽  
Georgy Kagramanov
Keyword(s):  
Natural Gas ◽  
Membrane Separation ◽  
Hollow Fiber Membrane ◽  
Operating Experience ◽  
Industrial Process ◽  
Transmembrane Pressure ◽  
Separation Performance ◽  
Membrane Element ◽  
Model Calculations ◽  
Support Resistance

Membrane separation for helium extraction from natural gas gained increased interest recently. Several vendors offer membrane elements for helium extraction, although data on their performance and operating experience are unpublished. The aim of this work was to obtain and study the separation performance of asymmetric hollow-fiber membrane element from commercial polyamide-imide Torlon®, in conditions close to the industrial process of helium extraction from natural gas. A membrane element with an active area of 0.177 m2, a helium permeance of 100 l(STP)/(m2·h·bar), and a selectivity α(He/CH4) = 340 was produced. This corresponds to a selective layer thickness of 82.3 nm, which was confirmed by SEM and resistance model calculations. The obtained membrane element was employed to decrease the concentration of helium in its binary mixture with methane from 0.4% to 0.05%. A relationship of separation characteristics from transmembrane pressure is also presented. At 70 bar and a stage cut of 2.7%, the feed flow rate was 0.16 m3(STP)/h, which yielded a helium permeate concentration of 14.7%. At 80 bar, a decrease in permeance to 60 l(STP)/(m2·h·bar) and in selectivity to 240 was observed. It was shown that the main reason for aging was the increased support resistance, due to a partial compaction of pores with a radius of less than 15 nm.

Membrane Separation of CO2 from Natural Gas: A State-of-the-Art Review on Material Development

2013 ◽  
Vol 333 ◽  
pp. 135-147 ◽  
Author(s):  
Ahmad Abdul Latif ◽  
Jimoh K. Adewole ◽  
Suzylawati Binti Ismail ◽  
Leo Choe Peng ◽  
Abdullah S. Sultan
Keyword(s):  
Natural Gas ◽  
Large Scale ◽  
Membrane Separation ◽  
Primary Source ◽  
Reference Source ◽  
Separation Performance ◽  
Separation Processes ◽  
Membrane Materials ◽  
Material Development ◽  
Separation Of Gas Mixtures

Natural gas (NG) processing and membrane technology are two very important fields that are of great significance due to increasing demand for energy as well as separation of gas mixtures. While NG is projected to be the number one primary source of energy by 2050, membrane separation is a commercially successful competitor to other separation techniques for energy efficient gas separation processes [1]. Most of the NG produced in the world is coproduced with acid gases such as CO2which need to be removed to increase the caloric value of NG. A comprehensive review of research efforts in CO2separation from natural gas is required to capture details of the current scientific and technological progresses on the development of new membrane materials with better separation performance, and the improvement of properties of the existing ones. This paper presents the progress that has been achieved in eliminating the limitations that dominate the large scale application of membrane materials at the present time. Various polymers that have been developed to resist plasticization and the method employed to fabricate these polymers are highlighted. Also the range of plasticization pressures (together with corresponding selectivities and permeabilities at these pressures) that have so far been achieved by these fabrication methods is presented. It is believed that this review will serve as a good reference source especially for research in design and development of membrane materials with better resistance to CO2-induced plasticization.

scholarly journals The application of A/O-MBR system for domestic wastewater treatment in Hanoi

2011 ◽  
Vol 1 (1) ◽  
pp. 19-24
Author(s):  
Thi Viet Nga Tran ◽  
Hoai Son Tran
Keyword(s):  
Wastewater Treatment ◽  
Treatment Process ◽  
Membrane Separation ◽  
Hollow Fiber Membrane ◽  
Domestic Wastewater ◽  
Transmembrane Pressure ◽  
Reactor Operation ◽  
Wastewater Treatment Process ◽  
Domestic Wastewater Treatment ◽  
Low Strength

The study aims to investigate an appropriate wastewater treatment process to treat domestic wastewater in Hanoi City which contain low-strength for COD (120-200 mg/L) but high in nitrogen content (10-40 mg/L). A lab scale anoxic-oxic system with a hollow fiber-Membrane Separation Bioreactor was operated at a flow rate of 5-10 L/h over a period of 150 days. The reactor was operated at different sludge recirculation rates. The MBR maintained relatively constant transmembrane pressure. During 150 days of reactor operation, treated water quality have COD of around 20 mg/L, NH4-N of less than 1 mg/L, NO3-N of less than 5 mg/L. The system shows good and stable efficiency for organic matter and nitrogen removal without adding an external carbon source and coagulants. The results based on the study indicated that the proposed process configuration has potential to treat the low-strength wastewater in Hanoi. Mục tiêu của nghiên cứu là đềxuất được một công nghệhiệu quảvà phù hợp đểxửlý nước thải sinh họat ởcác đô thịcủaViệt nam, là loại nước thải được thu gom từhệthốngthoát nước chung có nồng độchất hữu cơ thấp (COD 120-200 mg/l) nhưng hàm lượng chất dinh dưỡng như Nitơ, Phốt pho khá cao (T-N:10-40 mg/L). Chúng tôi đã nghiên cứu và vận hành chạy thửmô hình xửlý sinh học yếm khí-kỵkhí (AO) kết hợp với màng vi lọc ởquy mô mô hình phòng thí nghiệm (công suất 5-10 L/h) ởcác chếđộcông suất bùn tuần hoàn khác nhau. Kết quảxửlý trong thời gian 5tháng vận hành mô hình cho thấy chất lượng nước thải sau xửlý có hàm lượng COD nhỏhơn 20 mg/L, NH4-N nhỏhơn 1 mg/L, NO3-N nhỏhơn 5 mg/L. Hiệu suất xửlý chất hữu cơ và chất dinh dưỡng rất ổn định và hệthống không phải sửdụng các nguồn bổsung chất hữu cơ hay các hóa chất trợlắng như các công nghệđang áp dụng. Kết quảcho thấy công nghệAO kết hợp màng vi lọc có khảnăng áp dụng thực tế,phù hợp với những nơi có quỹđất nhỏ, chất lượng nước sau xửlý rất cao có thểphục vụcho mục đích tái sửdụng.

Mathematical Modeling of the Radial Crossflow Hollow Fiber Membrane Module for Multi-Component Gas Separation

2014 ◽  
Vol 625 ◽  
pp. 726-729 ◽  
Author(s):  
Serene Sow Mun Lock ◽  
Kok Keong Lau ◽  
Mohd Shariff Azmi
Keyword(s):  
Mathematical Model ◽  
Gas Separation ◽  
Hollow Fiber ◽  
Membrane Separation ◽  
Hollow Fiber Membrane ◽  
Membrane Module ◽  
Separation Performance ◽  
Fiber Membrane ◽  
Cell Balance ◽  
The Ideal

A “Multi-component Progressive Cell Balance” approach has been applied to characterize the gas separation of the radial crossflow hollow fiber membrane module. The mathematical model is an indispensable tool to evaluate the separation performance of membrane material towards different components. The approach is required to be implemented since there is scarcely available mathematical model to characterize the two dimensional radial crossflow. In addition, the currently available mathematical model is confined to the ideal binary system, which constraints its applicability in real membrane separation process with many components. The significance of the developed multi-component mathematical model as compared to the model adapting the ideal binary simulation condition is demonstrated in this study.

scholarly journals The Ceramic TiO2 Low-Pressure Nano-Filtration Membrane Separation Behavior for Single and Mixed Ion Salt Solutions

2019 ◽  
Vol 2 (1) ◽  
pp. 86-91
Author(s):  
Banan Hudaib
Keyword(s):  
Membrane Separation ◽  
Transmembrane Pressure ◽  
Separation Performance ◽  
Nanofiltration Membrane ◽  
Salt Solutions ◽  
Tio2 Ceramic ◽  
Filtration Membrane ◽  
Nano Filtration ◽  
Low Pressures ◽  
Separation Behavior

The objective of this work is to study the separation performance of a tubular TiO2 ceramic nanofiltration membrane operate at low pressures (2 bar), and the parameters that would affect the membrane rejection behavior, such as the ions valences, ions type, transmembrane pressure (TMP) values, and membrane zeta-potential. The membrane was used to desalinate water samples containing NaCl, NaNO3, and Na2SO4 in single and tertiary salts solution. The rejection of ions solutions took the following trend: R of sulphate (SO4 2- ) > R of nitrate (NO3 1- )>R of chloride (Cl1- )>R of sodium (Na1+). The highest SO4 2- rejection was about 62%, the highest NO3 1- rejection was about 51%, the highest Cl1- rejection was about 42%, and highest Na1+ rejection was about 37%.

scholarly journals Comparative Assessment of Tubular Ceramic, Spiral Wound, and Hollow Fiber Membrane Microfiltration Module Systems for Milk Protein Fractionation

Foods ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 692
Author(s):  
Roland Schopf ◽  
Florian Schmidt ◽  
Johanna Linner ◽  
Ulrich Kulozik
Keyword(s):  
Hollow Fiber ◽  
Milk Protein ◽  
Hollow Fiber Membrane ◽  
Comparative Assessment ◽  
Transmission Factor ◽  
Transmembrane Pressure ◽  
Protein Fractionation ◽  
Flow Conditions ◽  
Local Pressure ◽  
Spiral Wound

The fractionation efficiency of hollow fiber membranes (HFM) for milk protein fractionation was compared to ceramic tubular membranes (CTM) and spiral wound membranes (SWM). HFM combine the features of high membrane packing density of SWM and the more defined flow conditions and better control of membrane fouling in the open flow channel cross-sections of CTM. The aim was to comparatively analyze the effect of variations in local pressure and flow conditions while using single industrially sized standard modules with similar dimensions and module footprints (module diameter and length). The comparative assessment with varied transmembrane pressure was first applied for a constant feed volume flow rate of 20 m3 h−1 and, secondly, with the same axial pressure drop along the modules of 1.3 bar m−1, similar to commonly applied crossflow velocity and wall shear stress conditions at the industrial level. Flux, transmission factor of proteins (whey proteins and serum caseins), and specific protein mass flow per area membrane and per volume of module installed were determined as the evaluation criteria. The casein-to-whey protein ratios were calculated as a measure for protein fractionation effect. Results obtained show that HFM, which so far are under-represented as standard module types in industrial dairy applications, appear to be a competitive alternative to SWM and CTM for milk protein fractionation.

scholarly journals Fabrication of Polydimethysiloxane (PDMS) Dense Layer on Polyetherimide (PEI) Hollow Fiber Support for the Efficient CO2/N2 Separation Membranes

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 756
Author(s):  
Guoqiang Li ◽  
Katarzyna Knozowska ◽  
Joanna Kujawa ◽  
Andrius Tonkonogovas ◽  
Arūnas Stankevičius ◽  
...  
Keyword(s):  
Gas Separation ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Dip Coating ◽  
Separation Performance ◽  
Dense Layer ◽  
Pdms Layer ◽  
Coating Method ◽  
Coating Time ◽  
Dip Coating Method

The development of thin layer on hollow-fiber substrate has drawn great attention in the gas-separation process. In this work, polydimethysiloxane (PDMS)/polyetherimide (PEI) hollow-fiber membranes were prepared by using the dip-coating method. The prepared membranes were characterized by Scanning Electron Microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), and gas permeance measurements. The concentration of PDMS solution and coating time revealed an important influence on the gas permeance and the thickness of the PDMS layer. It was confirmed from the SEM and EDX results that the PDMS layer’s thickness and the atomic content of silicon in the selective layer increased with the growth in coating time and the concentration of PDMS solution. The composite hollow-fiber membrane prepared from 15 wt% PDMS solution at 10 min coating time showed the best gas-separation performance with CO2 permeance of 51 GPU and CO2/N2 ideal selectivity of 21.

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