scholarly journals Membrane Separation of Gaseous Hydrocarbons by Semicrystalline Multiblock Copolymers: Role of Cohesive Energy Density and Crystallites of the Polyether Block

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4181
Author(s):  
Md. Mushfequr Rahman
Keyword(s):  
Energy Density ◽  
Cohesive Energy ◽  
Membrane Separation ◽  
Gas Permeation ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Multiblock Copolymers ◽  
Cohesive Energy Density ◽  
Gaseous Hydrocarbons

The energy-efficient separation of hydrocarbons is critically important for petrochemical industries. As polymeric membranes are ideal candidates for such separation, it is essential to explore the fundamental relationships between the hydrocarbon permeation mechanism and the physical properties of the polymers. In this study, the permeation mechanisms of methane, ethane, ethene, propane, propene and n-butane through three commercial multiblock copolymers PEBAX 2533, PolyActive1500PEGT77PBT23 and PolyActive4000PEGT77PBT23 are thoroughly investigated at 33 °C. This study aims to investigate the influence of cohesive energy density and crystallites of the polyether block of multiblock copolymers on hydrocarbon separation. The hydrocarbon separation behavior of the polymers is explained based on the solution–diffusion model, which is commonly accepted for gas permeation through nonporous polymeric membrane materials.

Ionic Liquid Polymeric Membrane: Synthesis, Characterization & Performance Evaluation

2013 ◽  
Vol 594-595 ◽  
pp. 18-23 ◽  
Author(s):  
Dzeti Farhah Mohshim ◽  
Hilmi Mukhtar ◽  
Zakaria Man
Keyword(s):  
Ionic Liquid ◽  
Membrane Separation ◽  
Ideal Gas ◽  
Gas Permeation ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Separation Performance ◽  
Miscible Blends ◽  
Pes Membrane ◽  
The Ideal

Selected ionic liquids are known to enhance the absorption of CO2 for CO2 removal purpose. In the idea to improve the membrane separation performance for natural gas sweetening, ionic liquid modified polymeric membranes were fabricated by using polyethersulfone (PES) and blended with different composition of ionic liquid which are 5 wt% and 15 wt%. Each fabricated membranes were prepared and dried under solvent evaporation at 90°C. Dense structure observed from FESEM analysis indicated the miscible blends of ionic liquid and PES. TGA analysis showed all fabricated membranes are still containing solvent and this resembles that membrane drying period is still insufficient. All fabricated membranes were tested with ideal gas permeation test. From the result, the addition of ionic liquid has enhanced the ideal CO2 pemeance about 150% as compared to pure PES membrane. The ideal CO2/CH4 selectivity was also increase about 85% from the base but however, the separation index is still considered low and this may due to the presence of the solvent. This preliminary result has confirmed that the blending of ionic liquid with pure PES membrane has technically improved the membrane separation performance.

Liquid Structure, Thermodynamics, and Mixing Behavior of Saturated Hydrocarbon Polymers. 1. Cohesive Energy Density and Internal Pressure

1998 ◽  
Vol 31 (20) ◽  
pp. 6991-6997 ◽  
Author(s):  
Janna K. Maranas ◽  
Maurizio Mondello ◽  
Gary S. Grest ◽  
Sanat K. Kumar ◽  
Pablo G. Debenedetti ◽  
...  
Keyword(s):  
Energy Density ◽  
Internal Pressure ◽  
Cohesive Energy ◽  
Saturated Hydrocarbon ◽  
Liquid Structure ◽  
Cohesive Energy Density ◽  
Mixing Behavior ◽  
Hydrocarbon Polymers

Effects of Ionic Liquid Blending in Polymeric Membrane: Physical Properties and Performance Evaluation

2014 ◽  
Vol 625 ◽  
pp. 680-684 ◽  
Author(s):  
Dzeti Farhah Mohshim ◽  
Hilmi Mukhtar ◽  
Zakaria Man
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Membrane Separation ◽  
Initial Study ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Separation Performance ◽  
Operating Pressure ◽  
Membrane Gas Separation ◽  
Pes Membrane

— Polymeric membranes have been extensively used in membrane gas separation process. Nowadays, peoples are modifying the membrane by many ways like coating with ionic liquids to further enhance the membrane separation performance. In this project, ionic liquid modified polymeric membranes (ILMPM) have been successfully developed by blending the ionic liquids with the polymer via solvent evaporation method. The ionic liquid used was 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide, ([emim][Tf2N]) and for comparison purpose, the compositions were varied at 10 and 20 wt/wt%. In general, the blending of [emim][Tf2N] and PES has produced dense membrane with miscible mixture without any phase separation. It was observed that, the CO2permeance of ILMPM has been improved about 271% as compared to the pure PES membrane. However, the CO2permeance decreased with increasing operating pressure, yet the ILMPM CO2permeance still higher than CO2permeance of pure PES membrane. In addition, the CO2/CH4separation performance has greatly increased about 162% as the IL composition is increased. This initial study has proven that IL helps to enhance of CO2permeation and improve selectivity.

The Interaction between Rubber and Liquids. III. The Swelling of Vulcanized Rubber in Various Liquids

1943 ◽  
Vol 16 (2) ◽  
pp. 263-267 ◽  
Author(s):  
G. Gee
Keyword(s):  
Energy Density ◽  
Cohesive Energy ◽  
Molecular Volume ◽  
Substantial Agreement ◽  
Swelling Power ◽  
Cohesive Energy Density ◽  
Vulcanized Rubber ◽  
A Value

Abstract The entropy of swelling of vulcanized rubber is estimated, and assumed independent of the nature of the swelling liquid. The heat of swelling is related to the cohesive energy of the liquid, and a value of 66 calories per cc. deduced for the cohesive energy density of rubber. The swelling power of a liquid can be calculated approximately if its cohesive energy and molecular volume are known. Substantial agreement with theory is found in most cases, although it is necessary to consider aliphatic and aromatic liquids separately. The anomalously high swelling power of acids and alcohols arises from their association.

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