scholarly journals Multiobjective Optimization Based on “Distance-to-Target” Approach of Membrane Units for Separation of CO2/CH4

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1871
Author(s):  
Ricardo Abejón ◽  
Clara Casado-Coterillo ◽  
Aurora Garea
Keyword(s):  
Ionic Liquid ◽  
Multiobjective Optimization ◽  
Oil Recovery ◽  
Membrane Separation ◽  
Pressure Ratio ◽  
Composite Membranes ◽  
Membrane Area ◽  
Technical Performance ◽  
Separation Of Co2 ◽  
Chitosan Composite

The effective separation of CO2 and CH4 mixtures is essential for many applications, such as biogas upgrading, natural gas sweetening or enhanced oil recovery. Membrane separations can contribute greatly in these tasks, and innovative membrane materials are being developed for this gas separation. The aim of this work is the evaluation of the potential of two types of highly CO2-permeable membranes (modified commercial polydimethylsiloxane and non-commercial ionic liquid–chitosan composite membranes) whose selective layers possess different hydrophobic and hydrophilic characteristics for the separation of CO2/CH4 mixtures. The study of the technical performance of the selected membranes can provide a better understanding of their potentiality. The optimization of the performance of hollow fiber modules for both types of membranes was carried out by a “distance-to-target” approach that considered multiple objectives related to the purities and recovery of both gases. The results demonstrated that the ionic liquid–chitosan composite membranes improved the performance of other innovative membranes, with purity and recovery percentage values of 86 and 95%, respectively, for CO2 in the permeate stream, and 97 and 92% for CH4 in the retentate stream. The developed multiobjective optimization allowed for the determination of the optimal process design and performance parameters, such as the membrane area, pressure ratio and stage cut required to achieve maximum values for component separation in terms of purity and recovery. Since the purities and recoveries obtained were not enough to fulfill the requirements imposed on CO2 and CH4 streams to be directly valorized, the design of more complex multi-stage separation systems was also proposed by the application of this optimization methodology, which is considered as a useful tool to advance the implementation of the membrane separation processes.

Removal of CO2 from High-Temperature Flue Gas by PDMS/IL composite membranes

2022 ◽  
Author(s):  
Mian Wu ◽  
Xuehua Li ◽  
Xiaobing Li
Keyword(s):  
High Temperature ◽  
Flue Gas ◽  
Membrane Separation ◽  
Composite Membranes ◽  
Economic Benefits ◽  
Polymeric Membranes ◽  
Separation Of Co2 ◽  
Thermal Stable

Membrane separation of CO2 from high-temperature flue gas has economic benefits. Thus, the development of thermal-stable polymeric membranes with efficient permselectivity is very crucial. In this work, we designed a...

scholarly journals A Novel Process of H2/CO2 Membrane Separation of Shifted Syngas Coupled with Gasoil Hydrogenation

Processes ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 590
Author(s):  
Weirong Huang ◽  
Xiaobin Jiang ◽  
Gaohong He ◽  
Xuehua Ruan ◽  
Bo Chen ◽  
...  
Keyword(s):  
Coal Gasification ◽  
Membrane Separation ◽  
Pressure Ratio ◽  
Stable Operation ◽  
Total System ◽  
Separation And Purification ◽  
Membrane Area ◽  
System Pressure ◽  
Compressor Power ◽  
Hydrogenation Reactor

A novel process of membrane separation for H2/CO2 of shifted syngas coupled with gasoil hydrogenation (NMGH) is proposed. First, a new process, with two-stage CO2-selective and one-stage H2-selective membranes, was developed to substitute the conventional PSA separation devices to remove CO2 and purify H2 in coal gasification refineries to reduce energy consumption and investment costs. Then, the process was coupled with gasoil hydrogenation and the recycled H2 produced by the hydrogenation reactor could be further purified by the H2-selective membrane, which increased the H2 concentration of the hydrogenation reactor inlet by about 11 mol.% compared with the conventional direct recycling process, and the total system pressure was reduced by about 2470 kPa. At the same time, this additional membrane separation and purification prevented the accumulation of CO/CO2 in the recycled H2, which ensured the activity of the catalyst in the reactor and the long-term stable operation of the devices. Further, parameters such as compressor power, PI (polyimide)/PEO (polyethylene oxide) membrane area, pressure ratio on both sides of the membrane, and purity of make-up H2 were optimized by sensitivity analysis. The results showed that, compared with the conventional method, the NMGH process simplified operations, significantly reduced the total investment cost by $17.74 million, and lowered the total annual costs by $1.50 million/year.

scholarly journals 5 MW Closed Cycle Gas Turbine

1984 ◽  
Author(s):  
John L. Mason ◽  
Anthony Pietsch ◽  
Theodore R. Wilson ◽  
Allen D. Harper
Keyword(s):  
Power Systems ◽  
Gas Turbine ◽  
Oil Recovery ◽  
Low Cost ◽  
Pressure Ratio ◽  
Commercial Application ◽  
Solid Fuels ◽  
Closed Cycle ◽  
Emission Standards ◽  
Fluidized Bed Combustor

A novel closed-cycle gas turbine power system is now under development by the GWF Power Systems Company for cogeneration applications. Nominally the system produces 5 megawatts (MW) of electric power and 80,000 lb/hr (36,287 kg/hr) of 1000 psig (6895 kPa) steam. The heat source is an atmospheric fluidized bed combustor (AFBC) capable of using low-cost solid fuels while meeting applicable emission standards. A simple, low-pressure ratio, single spool, turbomachine is utilized. This paper describes the system and related performance, as well as the development and test efforts now being conducted. The initial commercial application of the system will be for Enhanced Oil Recovery (EOR) of the heavy crudes produced in California.

Using a simple method to prepare UiO‐66‐NH 2 /chitosan composite membranes for oil–water separation

2021 ◽  
pp. 50765
Author(s):  
Ximei Zhu ◽  
Zongxue Yu ◽  
Haojie Zeng ◽  
Xiaofang Feng ◽  
Yuchuan Liu ◽  
...  
Keyword(s):  
Composite Membranes ◽  
Simple Method ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water ◽  
Chitosan Composite

Polybenzimidazole and ionic liquid composite membranes for high temperature polymer electrolyte fuel cells

2021 ◽  
Vol 361 ◽  
pp. 115569
Author(s):  
Bingbing Niu ◽  
Shijing Luo ◽  
Chunling Lu ◽  
Wendi Yi ◽  
Jiantao Liang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Fuel Cells ◽  
High Temperature ◽  
Polymer Electrolyte ◽  
Composite Membranes ◽  
Polymer Electrolyte Fuel Cells

Composite membranes based on polybenzimidazole and ionic liquid functional Si–O–Si network for HT-PEMFC applications

2017 ◽  
Vol 42 (34) ◽  
pp. 21913-21921 ◽  
Author(s):  
Xue Tian ◽  
Shuang Wang ◽  
Jinsheng Li ◽  
Fengxiang Liu ◽  
Xu Wang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Composite Membranes

The Impact of Ionic Liquid and Nanoparticles on Stabilizing Foam for Enhanced Oil Recovery

2018 ◽  
Vol 3 (44) ◽  
pp. 12461-12468
Author(s):  
Lei Jiang ◽  
Jingtao Sun ◽  
Jiqian Wang ◽  
Qi Xue ◽  
Songyan Li ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
The Impact

scholarly journals Towards Biohydrogen Separation Using Poly(Ionic Liquid)/Ionic Liquid Composite Membranes

Membranes ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 124 ◽  
Author(s):  
Andreia S.L. Gouveia ◽  
Lucas Ventaja ◽  
Liliana C. Tomé ◽  
Isabel M. Marrucho
Keyword(s):  
Ionic Liquid ◽  
High Performance ◽  
Cost Effective ◽  
Clean Energy ◽  
Composite Membranes ◽  
Feed Pressure ◽  
Starting Point ◽  
Poly Ionic Liquid ◽  
Separation Performances ◽  
H2 Selectivity

Considering the high potential of hydrogen (H2) as a clean energy carrier, the implementation of high performance and cost-effective biohydrogen (bioH2) purification techniques is of vital importance, particularly in fuel cell applications. As membrane technology is a potentially energy-saving solution to obtain high-quality biohydrogen, the most promising poly(ionic liquid) (PIL)–ionic liquid (IL) composite membranes that had previously been studied by our group for CO2/N2 separation, containing pyrrolidinium-based PILs with fluorinated or cyano-functionalized anions, were chosen as the starting point to explore the potential of PIL–IL membranes for CO2/H2 separation. The CO2 and H2 permeation properties at the typical conditions of biohydrogen production (T = 308 K and 100 kPa of feed pressure) were measured and discussed. PIL–IL composites prepared with the [C(CN)3]− anion showed higher CO2/H2 selectivity than those containing the [NTf2]− anion. All the membranes revealed CO2/H2 separation performances above the upper bound for this specific separation, highlighting the composite incorporating 60 wt% of [C2mim][C(CN)3] IL.

Sign in / Sign up

Export Citation Format

Share Document