scholarly journals Optimization of Polyetherimide Based CMS Membranes Preparation Conditions for CO2/CH4 Selectivit

2017 ◽  
Vol 14 (1) ◽  
Author(s):  
M. A. Ahmad ◽  
N. K. A. Rashid ◽  
B. H. Hameed
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Molecular Sieve ◽  
Pyrolysis Temperature ◽  
Polymer Concentration ◽  
Carbon Molecular Sieve ◽  
Optimization Analysis ◽  
Preparation Conditions ◽  
Quadratic Models

Response surface methodology (RSM) was used to determine the optimum preparation conditions of polyetherimide based carbon molecular sieve (CMS) membranes. Two quadratic models were developed to correlate the pyrolysis temperature, pyrolysis time and polymer concentration to the responses; CO2 permeance and CO2/CH4permselectivity. According to the optimization analysis, the optimum preparation conditions were obtained by using pyrolysis temperature of 725°C, pyrolysis time of 3.0 h and polymer concentration of 8.52%, which resulted in CO2 permeance and CO2/CH4 permselectivity of 3.61×10–10 mol/m2.s.Pa and 4.35, respectively.

Optimization of Preparation of Microwave Irradiated Bio-Based Materials as Porous Carbons for VOCs Removal Using Response Surface Methodology

2014 ◽  
Vol 554 ◽  
pp. 175-179 ◽  
Author(s):  
Jibril Mohammed ◽  
Noor Shawal Nasri ◽  
Muhammad Abbas Ahmad Zaini ◽  
Usman Hamza Dadum ◽  
Murtala Musa Ahmed
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Microwave Power ◽  
Irradiation Time ◽  
Porous Carbons ◽  
Influence Of Process Parameters ◽  
Impregnation Ratio ◽  
Preparation Conditions ◽  
Activating Agent ◽  
Quadratic Models

Effluents from various industries release volatile organic compounds (VOCs) into the environment which causes serious environmental problems. Coconut shell based porous carbons (CSPC) were synthesized with potassium hydroxide as activating agent for adsorption of Benzene and Toluene. Central composite design (CCD) method under the response surface methodology (RSM) of the Design expert software version 7.1.6. was employed in the optimization of the preparation conditions of the porous carbons. The effects of three preparation variables (i.e. microwave power, irradiation time and KOH impregnation ratio) on Benzene and Toluene adsorption were studied. Based on the CCD, quadratic models were developed to correlate the preparation variables to the responses (Benzene and Toluene adsorption). The influence of process parameters on the properties of CSPC was examined using analysis of variance (ANOVA) to identify the significant parameters. The optimum condition was obtained at microwave power of 500W; irradiation time 4mins; and 1.5 KOH impregnation ratio, which resulted in 84% of Benzene and 85% of Toluene respectively at 95% yield.

scholarly journals Tailoring the Stabilization and Pyrolysis Processes of Carbon Molecular Sieve Membrane Derived from Polyacrylonitrile for Ethylene/Ethane Separation

Membranes ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 93
Author(s):  
DaeHun Kim ◽  
YongSung Kwon ◽  
Jung-Hyun Lee ◽  
Seong-Joong Kim ◽  
You-In Park
Keyword(s):  
Molecular Sieve ◽  
Pyrolysis Temperature ◽  
Separation Performance ◽  
Carbon Molecular Sieve ◽  
Alumina Support ◽  
Soaking Time ◽  
Polymer Precursors ◽  
Pre Treatment ◽  
Excellent Thermal Property ◽  
Pyrolysis Processes

For ethylene/ethane separation, a CMS (carbon molecular sieve) membrane was developed with a PAN (polyacrylonitrile) polymer precursor on an alumina support. To provide an excellent thermal property to PAN precursor prior to the pyrolysis, the stabilization as a pre-treatment process was carried out. Tuning the stabilization condition was very important to successfully preparing the CMS membrane derived from the PAN precursor. The stabilization and pyrolysis processes for the PAN precursor were finely tuned, and optimized in terms of stabilization temperature and time, as well as pyrolysis temperature, heating rate, and soaking time. The PAN stabilized at >250 °C showed improved thermal stability and carbon yield. The CMS membrane derived from stabilized PAN showed reasonable separation performance for ethylene permeance (0.71 GPU) and ethylene/ethane selectivity (7.62), respectively. Increasing the pyrolysis temperature and soaking time gave rise to an increase in the gas permeance, and a reduction in the membrane selectivity. This trend was opposite to that for the CMS membranes derived from other polymer precursors. The optimized separation performance (ethylene permeance of 2.97 GPU and ethylene/ethane selectivity of 7.25) could be achieved at the pyrolysis temperature of 650 °C with a soaking time of 1 h. The separation performance of the CMS membrane derived from the PAN precursor was comparable to that of other polymer precursors, and surpassed them regarding the upper bound trade off.

Preparation of Activated Carbon from Formic Acid Hydrolysis Residue by Chemical Activation of ZnCl2

2013 ◽  
Vol 860-863 ◽  
pp. 527-533
Author(s):  
Zhen Wu ◽  
Yong Sun ◽  
Lei Hu ◽  
Ning Xu ◽  
Ben Lin Dai
Keyword(s):  
Response Surface Methodology ◽  
Activated Carbon ◽  
Formic Acid ◽  
Acid Hydrolysis ◽  
Wheat Straw ◽  
Response Surface ◽  
Reaction Temperature ◽  
Preparation Conditions ◽  
Formic Acid Hydrolysis ◽  
Hydrolysis Residue

Utilization of wheat straw for bio-based chemicals production is a research focus. In this work, experiments were conducted to study the preparation conditions of activated carbon from formic acid hydrolysis residue of wheat straw applying response surface methodology. The effects of activation reaction temperature, retention time and activator quantity on the decolorizing capacity of activated carbon were dealt with in this paper. Optimal preparation conditions were abtained by response surface methodology as followed: the content of ZnCl2 solution was 14.2%, reaction temperature was 798°C and retained time was 30 mins with a decolorizing capacity of 15.8 mL methylene blue. Results indicated that the technology was available.

scholarly journals Optimization of Preparation Conditions for Lysozyme Nanoliposomes Using Response Surface Methodology and Evaluation of Their Stability

Molecules ◽  
2016 ◽  
Vol 21 (6) ◽  
pp. 741 ◽  
Author(s):  
Zhipan Wu ◽  
Rongfa Guan ◽  
Fei Lyu ◽  
Mingqi Liu ◽  
Jianguo Gao ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Preparation Conditions

scholarly journals Experimental Study and Response Surface Methodology for Investigation of FSP Process

2014 ◽  
Vol 61 (4) ◽  
pp. 539-552
Author(s):  
Marek Stanisław Weglowski
Keyword(s):  
Experimental Study ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Friction Stir Processing ◽  
Rotational Speed ◽  
Parent Material ◽  
Quadratic Model ◽  
Friction Stir ◽  
Microstructure Refining ◽  
Quadratic Models

Abstract The article presents the effect of rotational and travelling speed and down force on the spindle torque acting on the tool in Friction Stir Processing (FSP) process. The response surface methodology (RSM) was applied to find a dependence combining the spindle torque acting on the tool with the rotational speed, travelling speed and the down force. The linear and quadratic models with interaction between parameters were used. A better fitting was achieved for a quadratic model. The studies have shown that the increase in rotational speed causes a decrease in the torque while the increase in travelling speed and down force causes an increase in the torque. The tests were conducted on casting aluminium alloy AlSi9Mg. Metallography examination has revealed that the application of FSP process results in a decrease in the porosity in the modified material and microstructure refining in the stir zone. The segregation of Si and Fe elements was evident in the parent material, while in the friction stir processed area this distribution was significantly uniform.

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