Separation of Dimethylformamide/H2O Mixtures Using Pervaporation-Distillation Hybrid Process

2011 ◽  
Vol 233-235 ◽  
pp. 866-869 ◽  
Author(s):  
Guang Lu Han ◽  
Qi Zhang ◽  
Jing Zhong ◽  
Hui Shao ◽  
Huan Ru Zhang
Keyword(s):  
Aqueous Solution ◽  
Separation Factor ◽  
Aspen Plus ◽  
Composite Membranes ◽  
Hybrid Process ◽  
Hybrid Processes ◽  
Operation Temperature ◽  
The Cost

Three kinds of commercial PVA composite membranes with different crosslinking degrees (PVA-1, PVA-2 and PVA-3) were used to separate DMF/H2O mixtures. Their pervaporation performance was investigated at different operation temperatures. The results showed that PVA-1 was the most suitable one for separating DMF/H2O mixtures. When operation temperature was 60°C and downstream pressure was lower than 6kPa, flux reached to 0.59 kg·m-2·h-1 and separation factor was 33 for PVA-1 membranes. Aspen Plus® was applied to simulate the normal distillation for retentate from pervaporation unit. Comparing with the two-effect distillation, the cost of concentrating DMF could be reduced 16.2% to 19.2% for DMF aqueous solution with different composition by hybrid processes. The cost would be the lowest for a hybrid process that concentrated the feed into 50wt% by pervaporation firstly, then concentrated retentate to 99.6wt% by two-effect distillation

Dehydration of water/pyridine mixtures by pervaporation using cellulose acetate/ polyacrylonitrile blend membrane

2011 ◽  
Vol 63 (8) ◽  
pp. 1695-1700 ◽  
Author(s):  
J. H. Lv ◽  
G. M. Xiao
Keyword(s):  
Cellulose Acetate ◽  
Separation Factor ◽  
Experimental Results ◽  
Separation Performance ◽  
Permeation Flux ◽  
Feed Concentration ◽  
Blend Membrane ◽  
Pyridine Solution ◽  
Operation Temperature

Cellulose acetate/ polyacrylonitrile (CA/PAN) membranes were prepared and used to separate pyridine / water mixtures by pervaporation. The membranes were characterized through SEM. The effects of feed concentration, operation temperature and downstream pressure on the separation performance were evaluated. Experimental results indicated the increase of operation temperature could raise the permeation flux and the separation factor, while increasing feed concentration and downstream pressure would raise the separation factor and decrease the permeation flux. Under the conditions that pyridine solution was 99 wt.%, operation temperature was 323 K and downstream pressure was 20 mmHg, the CA/PAN blend membrane showed its best separation performance that the permeation flux was 56 · g · m−2 h−1 and the separation factor was 182.

scholarly journals Demonstration and Assessment of Purification Cascades for the Separation and Valorization of Hemicellulose from Organosolv Beechwood Hydrolyzates

Membranes ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 82
Author(s):  
Roy Nitzsche ◽  
Hendrik Etzold ◽  
Marlen Verges ◽  
Arne Gröngröft ◽  
Matthias Kraume
Keyword(s):  
Energy Efficiency ◽  
Hydrothermal Treatment ◽  
Experimental Work ◽  
Value Added ◽  
Aspen Plus ◽  
High Potential ◽  
Production Costs ◽  
Specific Production ◽  
The Cost ◽  
Value Added Products

Hemicellulose and its derivatives have a high potential to replace fossil-based materials in various high-value-added products. Within this study, two purification cascades for the separation and valorization of hemicellulose and its derived monomeric sugars from organosolv beechwood hydrolyzates (BWHs) were experimentally demonstrated and assessed. Purification cascade 1 included hydrothermal treatment for converting remaining hemicellulose oligomers to xylose and the purification of the xylose by nanofiltration. Purification cascade 2 included the removal of lignin by adsorption, followed by ultrafiltration for the separation and concentration of hemicellulose. Based on the findings of the experimental work, both cascades were simulated on an industrial scale using Aspen Plus®. In purification cascade 1, 63% of the oligomeric hemicellulose was hydrothermally converted to xylose and purified by nanofiltration to 7.8 t/h of a xylose solution with a concentration of 200 g/L. In purification cascade 2, 80% of the lignin was removed by adsorption, and 7.6 t/h of a purified hemicellulose solution with a concentration of 200 g/L was obtained using ultrafiltration. The energy efficiency of the cascades was 59% and 26%, respectively. Furthermore, the estimation of specific production costs showed that xylose can be recovered from BWH at the cost of 73.7 EUR/t and hemicellulose at 135.1 EUR/t.

Synthesis of metal organic framework modified with carboxylated attapulgite and adsorption properties for organic dye

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Fanhua Wu ◽  
Yuyu Zhang ◽  
Tao Li ◽  
Yongfeng Liu ◽  
Yi Liu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hybrid Materials ◽  
Congo Red ◽  
Metal Organic Framework ◽  
Adsorption Efficiency ◽  
Anionic Dyes ◽  
Content Type ◽  
Low Concentration ◽  
Metal Organic ◽  
The Cost

Purpose The purpose of this study was to prepare carboxylated attapulgite (APT-COOH) and then be used as one of the ligands to prepare metal organic framework (MOF) hybrid materials to reduce the cost of MOF materials and improve the dispersed condition of APT. And then the materials were used to enrich anionic dye Congo red from aqueous solution. Design/methodology/approach The MOF hybrid materials were designed by means of facile reflux method rather than hydrothermal method, characterized by Thermogravimetric Analysis (TGA), Fourier Transform Infrared (FTIR) Spectrometer and pore structure. The dispersed degree of APT-COOH in the MOF materials was validated according to adsorption efficiency for Congo red. Findings Due to introduction of APT-COOH, the microenvironment of the MOF materials changed, leading to different adsorption behaviors. Compared to the MOF material without APT-COOH, the adsorption capacities of the hybridized MOF materials with different amounts of APT-COOH introduced increased by 4.58% and 15.55%, respectively, as the initial concentration of Congo red solution of 300 mg/L. Meantime, hybridized MOF materials were suitable to remove Congo red with low concentration, while the MOF material without APT-COOH was appropriate to enrich Congo red with high concentration. Research limitations/implications The microstructure of MOF hybrid materials in detail is the further and future investigation. Practical implications This study will provide a method to reduce the cost of MOF materials and a theoretical support to treat anionic dyes from aqueous solution. Originality/value APT-COOH was prepared and used as one of the ligands to synthesize MOF material to improve the dispersed degree of APT-COOH and reduce the cost of the MOF materials. The adsorption efficiency was greatly enhanced with low concentration of Congo red solution, and the results indicated that hydrogen bonding, electrostatic interaction, and p-p conjugation were involved in the adsorption process. The prepared MOFs materials exhibited excellent adsorption efficiency, which made the present materials highly promising and potentially useful in practical application as adsorbents to enrich anionic dyes such as Congo red from aqueous solution.

Preparation of NaA/PTFE Composite Membrane for Separation of DMF/H2O Mixture by Pervaporation

2011 ◽  
Vol 239-242 ◽  
pp. 2624-2627
Author(s):  
Hui Shao ◽  
Huan Ru Zhang ◽  
Qi Zhang ◽  
Guang Lu Han ◽  
Ruo Yu Chen ◽  
...  
Keyword(s):  
Composite Membrane ◽  
Separation Factor ◽  
Secondary Growth ◽  
Composite Membranes ◽  
Zeolite Crystal ◽  
Ptfe Film ◽  
Ptfe Composite ◽  
Structure And Morphology

The NaA/PTFE composite membranes were synthesized on polytetrafluoroethylene (PTFE) film by hydrothermal secondary growth (HSG) method and scratching (ST) method. The structure and morphology were characterized by XRD and SEM. The pervaporation(PV) performance of NaA/PTFE composite membranes were evaluated with dimethylformamide (DMF)/water mixtures. The XRD results showed that NaA/PTFE composite membranes kept the zeolite crystal feature of A type. The substrate, PTFE and zeolite were firmly combined together by the SEM photos. The results of PV showed that the flux and the separation factor of NaA/PTFE composite membrane prepared by HSG method with 4 crystallization times were 0.54 kg/m2 h and 23, respectively. The flux of NaA/PTFE composite membrane prepared by ST method was much larger than that of NaA/PTFE composite membrane prepared by HSG method, but separation factor was lower.

scholarly journals Investigation of biomass components on the slow pyrolysis products yield using Aspen Plus for techno-economic analysis

2020 ◽  
Author(s):  
Muhammad Shahbaz ◽  
Ahmed AlNouss ◽  
Prakash Parthasarathy ◽  
Ali H. Abdelaal ◽  
Hamish Mackey ◽  
...  
Keyword(s):  
Lignin Content ◽  
Pyrolysis Product ◽  
Aspen Plus ◽  
Pyrolysis Products ◽  
Slow Pyrolysis ◽  
Bio Oil ◽  
Biomass Components ◽  
Solid Residence Time ◽  
The Cost ◽  
Selection Of

Abstract Prior information on the pyrolysis product behaviour of biomass components-cellulose, hemicellulose and lignin is critical in the selection of feedstock as components have a significant influence on the pyrolysis products yield. In this study, the effect of biomass components on the yield of slow pyrolysis products (char, bio-oil and syngas) is investigated using a validated ASPEN Plus® model. The model is simulated at a temperature of 450 °C, a heating rate of 10 °C/min and a solid residence time of 30 min. The results indicated that at the given conditions, lignin contributed 2.4 and 2.5 times more char yield than cellulose and hemicellulose. The hemicellulose contributed 1.33 times more syngas yield than lignin while the cellulose and hemicellulose contributed 8.67 times more bio-oil yield than lignin. Moreover, the cost involved in the production of char using lignin (110 $/ton) is significantly economical than using cellulose (285 $/ton) and hemicellulose (296 $/ton). The net CO2 emission of lignin pyrolysis is 4.14 times lower than cellulose pyrolysis and 3.94 times lower than hemicellulose pyrolysis. It can be concluded that lignin pyrolysis is more advantageous than cellulose and hemicellulose pyrolysis. In the selection of feedstock for the slow pyrolysis, the feedstock with more lignin content is preferred. Graphical abstract

PENGARUH LARUTAN BENFIELD, LAJU ALIR GAS PROSES, DAN BEBAN REBOILER TERHADAP ANALISA KINERJA KOLOM CO2 ABSORBER DENGAN MENGGUNAKAN SIMULATOR ASPEN PLUS V. 8.6

Konversi ◽  
2017 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Bagus Kurniadi ◽  
Dexa Rahmadan ◽  
Gusti Riyan Febriyanto ◽  
Ari Susandy Sanjaya
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Aspen Plus ◽  
Actual Condition ◽  
Gas Flow Rate ◽  
Design Data ◽  
Catalyst Synthesis ◽  
Process Gas ◽  
Co2 Output ◽  
The Cost

 Abstrak-Absorbsi adalah operasi pemisahan solute dari fasa gas ke fasa cair, yaitu dengan mengontakkan gas yang berisi solute dengan pelarut cair yang tidak menguap. Penerapan absorbsi dalam industri untuk mengambil suatu komponen dari campuran gas suatu produk reaksi, salah satu komponen yang sering dipisahkan adalah gas CO2. Pengurangan kadar CO2 dari aliran gas proses dapat menghindari poisoning katalis sintesis serta dapat mengurangi biaya operasi. Penentuan properties yang digunakan dalam simulasi program Aspen Plus v.8.6 adalah property ELECNRTL dan equilibirium vapour-liquid. Metode yang digunakan pada simulasi/penelitian ini adalah melakukan penentuan laju alir gas proses kolom absorber terdiri dari pengambilan data dan pengolahan data yang kemudian dilakukan simulasi. Tujuan dari simulasi ini adalah untuk mengetahui profil kadar keluaran CO2 pada kolom CO2 absorber pada kondisi aktual dibandingkan dengan data desain, yang ditinjau dari pengaruh konsentrasi larutan Benfield, laju sirkulasi larutan Benfield, laju alir dari gas proses, serta pengaruh reboiler duty pada kolom absorber. Berdasarkan hasilnya, keluaran gas CO2 dari absorber adalah 0,11% yang mana melebihi batas dari desain yaitu 0,1% dengan kondisi gas seperti ini, untuk meningkatkan kinerja dari absorber maka CO2 keluaran harus sama dengan batasan dari desain. Untuk mengatasi masalah ini, dengan cara meningkatkan konsentrasi  Benfield menjadi 29,8% dan menurukan laju alir gas proses. Penambahan beban reboiler pada absorber akan meningkatkan kadar CO2 keluaran absorber, sehingga penambahan beban reboiler pada absorber tidak perlu dilakukan. Kata kunci : Absorber, Konsentrasi Benfield, Laju Alir Gas Proses, Kadar CO2, Reboiler Duty, Aspen Plus Abstract-Absorption is the operation separation of solutes from the gas phase into the liquid phase, with contacting the gas which contains solute liquid with solvent that doesn’t evaporate. The application of absorption in the industry is taking a component from gas mixture to take reaction product, one of the component that frequently separated is CO2. Equity levels of CO2 from process gas stream can be avoid poisoning the catalyst synthesis as well as can be reduced the cost of operation. The property of simulation program Aspen Plus v.8.6 is ELECNRTL and equilibrium vapor-liquid. The method that used for this simulation or research is determination flow rate of process gas from column absorber based from base design data and working data which then simulated. The purpose from this simulation is to get knowing the profil level of exodus CO2 in CO2 column absorber in the actual condition which compare with design condition, which under review from effect of the concentration of Benfield solution, circulation flow of Benfield solution, flowrate from gas process, and effect from reboiler duty in column absorber. Based on the result, CO2 gas outlet from the absorber is 0.11% which exceeds the limit from design, that is 0.1% with this condition, to increase the performance of the absorber, the CO2 must have the same output from the limit of design.  To solve this problem, increasing the concentration of Benfield to 29.8% and lowering the gas flow rate. Adding reboiler duty in the absorber, it will increase the level of CO2 output from absorber, so adding reboiler duty in the absorber is not necessary. Keywords : Absorber, Benfield Concentration, Process Gas Flow Rate, CO2 Levels, Reboiler Duty, Aspen Plus

Performance Analysis of Existing 600MW Coal-Fired Power Plant with MEA-Based CO2 Capture

2011 ◽  
Vol 130-134 ◽  
pp. 3807-3811
Author(s):  
Gang Xu ◽  
Shou Cheng Li ◽  
Xing Yuan ◽  
Yong Ping Yang ◽  
Xiao Na Song
Keyword(s):  
Power Plant ◽  
Performance Analysis ◽  
Economic Performance ◽  
Power Plants ◽  
Aspen Plus ◽  
Capture Process ◽  
Operating Data ◽  
Integrated Optimization ◽  
The Cost ◽  
Plant Efficiency

This paper presents the techno-economic performance of 600 MW coal-fired power plant with and without MEA-based CO2 capture process, based on the operating data of an existing power plant. The simulation and analysis are based on ASPEN PLUS, with fully consideration of features of existing coal-fired power plants and the integration of CO2 capture process with steam cycle. The results show that, when adopting CO2 capture process, the plant efficiency will decrease significantly. And the cost for electricity will increase dramatically. Through further system integrated optimization, the efficiency fall from 40.28% to 29.61%, which is still tremendous but obviously better performance than before.

scholarly journals VTOS Cross-Linked PDMS Membranes for Recovery of Ethanol from Aqueous Solution by Pervaporation

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Jin Gu ◽  
Yunxiang Bai ◽  
Lin Zhang ◽  
Lirong Deng ◽  
Chunfang Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Separation Factor ◽  
Pdms Membrane ◽  
Total Flux ◽  
Cross Linking ◽  
High Separation Factor ◽  
Ethanol Aqueous Solution ◽  
High Ethanol ◽  
Feed Temperature ◽  
High Separation

PDMS membranes were prepared by cross-linking with vinyltriethoxysilane (VTOS) on polyacrylonitrile (PAN) substrate to increase hydrophobicity and improve pervaporation (PV) performance. It was shown that the membranes had high ethanol permselectivity and flux. The effects of cross-linking temperature, the content of cross-linking agent, and feed temperature on PV performance of VTOS cross-linked PDMS membranes were investigated. For 6 wt% ethanol aqueous solution, the PDMS membrane had the high separation factor of 15.5 and total flux 573.3 g·m−2·h−1, respectively, when the feed temperature was 40°C, H-PDMS : VTOS : DBTDL = 1 : 0.2 : 0.02 and cross-linking temperature was 80°C.

Sign in / Sign up

Export Citation Format

Share Document