High-Performance Polymer Molecular Sieve Membranes Prepared by Direct Fluorination for Efficient Helium Enrichment

2021 ◽  
Author(s):  
Xiaohua Ma ◽  
Kaihua Li ◽  
Zhiyang Zhu ◽  
Hao Dong ◽  
Jia Lv ◽  
...  
Keyword(s):  
Natural Gas ◽  
Molecular Sieve ◽  
High Performance ◽  
Separation Membranes ◽  
Direct Fluorination ◽  
High Performance Polymer

One of the biggest challenges facing membrane-based helium (He) recovery from natural gas is the lack of efficient He separation membranes featuring both high He permeability and He/CH4 selectivity (>...

High-Performance Polymer Membranes for Natural-Gas Sweetening

2006 ◽  
Vol 18 (1) ◽  
pp. 39-44 ◽  
Author(s):  
H. Lin ◽  
E. Van Wagner ◽  
R. Raharjo ◽  
B. D. Freeman ◽  
I. Roman
Keyword(s):  
Natural Gas ◽  
High Performance ◽  
Polymer Membranes ◽  
Gas Sweetening ◽  
High Performance Polymer ◽  
Natural Gas Sweetening

Selective Matrimid Membranes Containing Mesoporous Molecular Sieves

2002 ◽  
Vol 752 ◽  
Author(s):  
Kenneth J. Balkus ◽  
Kyle Cattanach ◽  
Inga H. Musselman ◽  
John P. Ferraris
Keyword(s):  
Molecular Sieves ◽  
Molecular Sieve ◽  
High Performance ◽  
Gas Permeability ◽  
Amorphous Material ◽  
Polymer Chains ◽  
Mesoporous Molecular Sieves ◽  
Permeability Characteristics ◽  
High Performance Polymer ◽  
The Ideal

ABSTRACTWe have employed mesoporous molecular sieves in polymer membranes in an effort to enhance the permselectivity. The principal advantage of these materials is that the polymer chains can penetrate the pores reducing the nonselective voids that are often observed with inorganic additives. In this study, we have prepared Matrimid® membranes with various loadings of the all silica molecular sieve DAM-1 (Dallas Amorphous Material) as well as DAM-1 functionalized with amines in the channel wall, to enhance the gas permeability characteristics of a high performance polymer. For all gases tested (N2, O2, CO2, CH4), the permeability increased in proportion to the wt % of the amine DAM-1 present in the membrane. The addition of the amine DAM-1 resulted in modest ideal O2/N2 permselectivity, while the ideal CO2/CH4 permselectivity values were >100, depending upon the moisture content of the feed. The ideal CO2/CH4 permselectivity values are among the highest for this type of composite membrane. Details of membrane fabrication as well as permeability and permselectivity results will be presented for a range of Matrimid®/molecular sieve composites.

scholarly journals Upgrading of raw natural gas using high-performance polymer membranes

1993 ◽  
Author(s):  
S.A. Stern ◽  
H.S. Meyer ◽  
V.K. Venkataraman ◽  
H.D. Shoemaker
Keyword(s):  
Natural Gas ◽  
High Performance ◽  
Polymer Membranes ◽  
High Performance Polymer

Comparison of Two Evaluating Methods for Establishing the Marginal Fit on Four Heat - Pressed Resin Inlays

2018 ◽  
Vol 69 (4) ◽  
pp. 890-893
Author(s):  
Sorana Baciu ◽  
Cristian Berece ◽  
Adrian Florea ◽  
Andrada Voina Tonea ◽  
Ondine Lucaciu ◽  
...  
Keyword(s):  
High Performance ◽  
Clinical Results ◽  
Marginal Fit ◽  
High Performance Polymer ◽  
Investigation Methods ◽  
Evaluating Methods

In this study were compared two investigation methods, a bi- and tri-dimensional techniques by examining the marginal fit pressed in (BioHPP) Inlays. The study pruved that the BioHPP is a high performance polymer which provides very good clinical results.

scholarly journals CFD Study and Experimental Validation of a Dual Fuel Engine: Effect of Engine Speed

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4307
Author(s):  
Roberta De Robbio ◽  
Maria Cristina Cameretti ◽  
Ezio Mancaruso ◽  
Raffaele Tuccillo ◽  
Bianca Maria Vaglieco
Keyword(s):  
Natural Gas ◽  
High Performance ◽  
Engine Speed ◽  
Pollutant Emissions ◽  
Dual Fuel ◽  
Automotive Market ◽  
Light Duty ◽  
Viable Solution ◽  
Dual Fuel Engines ◽  
Gas Ratio

Dual fuel engines induce benefits in terms of pollutant emissions of PM and NOx together with carbon dioxide reduction and being powered by natural gas (mainly methane) characterized by a low C/H ratio. Therefore, using natural gas (NG) in diesel engines can be a viable solution to reevaluate this type of engine and to prevent its disappearance from the automotive market, as it is a well-established technology in both energy and transportation fields. It is characterized by high performance and reliability. Nevertheless, further improvements are needed in terms of the optimization of combustion development, a more efficient oxidation, and a more efficient exploitation of gaseous fuel energy. To this aim, in this work, a CFD numerical methodology is described to simulate the processes that characterize combustion in a light-duty diesel engine in dual fuel mode by analyzing the effects of the changes in engine speed on the interaction between fluid-dynamics and chemistry as well as when the diesel/natural gas ratio changes at constant injected diesel amount. With the aid of experimental data obtained at the engine test bench on an optically accessible research engine, models of a 3D code, i.e., KIVA-3V, were validated. The ability to view images of OH distribution inside the cylinder allowed us to better model the complex combustion phenomenon of two fuels with very different burning characteristics. The numerical results also defined the importance of this free radical that characterizes the areas with the greatest combustion activity.

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