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A Demonstration of High Temperature MED-TVC Desalination Technology in the Gulf Area
Younggeun Lee,
Osman Ahmed Hamed,
Amr Mohammad Mahmoud,
Khalid Bamardouf,
Sultan Ahmed,
Byungsung Park,
Abdulaziz Suliman Al-Jamhan
Issue:
Volume 7, Issue 2, March 2019
Pages:
57-64
Received:
14 April 2019
Accepted:
23 May 2019
Published:
19 June 2019
Abstract: This work focuses on a multiple effect desalination system with thermal vapor compressor (MED-TVC) operating at a top brine temperature (TBT) of 85°C which is significantly above the common operation temperatures of conventional MED-TVC systems, limited to a range below 70°C mainly due to scale risk. Such increase in TBT would enhance the production and system economics. A pilot plant installed at the Desalination Technologies Research Institute (DTRI) of the Saline Water Conversion Corporation (SWCC) in Jubail, Saudi Arabia was operated at the TBT of 85°C over a 5-month test period. Visual inspection of tube bundles after the test, in conjunction with chemical scale analysis showed that scaling was limited to a soft thin film scale, which was easily removed by flushing with water, which confirmed a low fouling potential analyzed from operation data. Techno-economic analysis of the MED-TVC system operating at a TBT of 85°C, indicated up to 34% reduction in steam consumption and up to 16% reduction in the levelized cost of water (LCOW), when compared with a MED-TVC unit operating at a conventional TBT of 65°C. Accordingly, the high temperature MED-TVC systems operating at a TBT of 85°C can be considered as a financially competitive and technologically reliable desalination option for the Gulf area which has challenging seawater characteristics.
Abstract: This work focuses on a multiple effect desalination system with thermal vapor compressor (MED-TVC) operating at a top brine temperature (TBT) of 85°C which is significantly above the common operation temperatures of conventional MED-TVC systems, limited to a range below 70°C mainly due to scale risk. Such increase in TBT would enhance the productio...
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Study on the Application of Zinc-zeolite in Cosmetic Toothpaste
Difang Zhao,
Chunsheng Xu
Issue:
Volume 7, Issue 2, March 2019
Pages:
65-70
Received:
25 October 2018
Accepted:
26 June 2019
Published:
11 July 2019
Abstract: Beauty toothpaste, which can whiten teeth and refresh breath, is becoming more and more popular in the market. This paper studies the feasibility of applying zinc zeolite in toothpaste, including the preparation method of zinc zeolite toothpaste, quality index test, bacteriostasis test, stain removal test and halitosis reduction test. The results show that the quality of zinc zeolite toothpaste meets the requirements of china national standards. The bacteriostasis rate of 5% zinc zeolite toothpaste to Staphylococcus aureus and Escherichia coli can reach 99.9%. Zinc zeolite toothpaste has obvious effect of removing stains and halitosis. The conclusion of this paper is that zinc zeolite toothpaste is a safe and effective cosmetic toothpaste, which can be produced in batches.
Abstract: Beauty toothpaste, which can whiten teeth and refresh breath, is becoming more and more popular in the market. This paper studies the feasibility of applying zinc zeolite in toothpaste, including the preparation method of zinc zeolite toothpaste, quality index test, bacteriostasis test, stain removal test and halitosis reduction test. The results s...
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Effect of Oleylamine Concentration and Operating Conditions on Ternary Nanocatalyst for Fischer-Tropsch Synthesis Using Response Surface Methodology
Tahereh Taherzadeh Lari,
Hamid Reza Bozorgzadeh,
Hossein Atashi,
Abdol Mahmood Davarpanah,
Ali Akbar Mirzaei
Issue:
Volume 7, Issue 2, March 2019
Pages:
71-80
Received:
29 May 2019
Accepted:
1 July 2019
Published:
12 July 2019
Abstract: The Fe-Co-Ce nanocatalyst was synthesized by a solvothermal method and used in Fischer-Tropsch synthesis. This paper represents a statistical analysis to illustrate the effects of oleylamine concentration and operating variables (temperature, pressure, inlet H2/CO molar ratio) on light olefin (C2=-C4=), paraffin (C1 + C2-C4) selectivity and CO conversion (catalyst activity) in a fixed bed micro reactor was done. In order to evaluate variable effects, analysis of variance (ANOVA) was applied for modeling and optimization of goal products using response surface methodology (RSM). The result showed that by increasing both amine concentration and pressure at lower temperature and inlet H2/CO molar ratio, olefin selectivity and CO conversion rises, while paraffin selectivity reduces. Comparison of optimization results to maximum olefin selectivity and CO conversion and minimum paraffin selectivity for predicted and experimental data indicate a desirable agreement.
Abstract: The Fe-Co-Ce nanocatalyst was synthesized by a solvothermal method and used in Fischer-Tropsch synthesis. This paper represents a statistical analysis to illustrate the effects of oleylamine concentration and operating variables (temperature, pressure, inlet H2/CO molar ratio) on light olefin (C2=-C4=), paraffin (C1 + C2-C4) selectivity and CO conv...
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