Removal of Thiophene from Binary Mixtures Using Polyether Block Amide (PEBAX) Film by Pervaporation

2013 ◽  
Vol 726-731 ◽  
pp. 4101-4108 ◽  
Author(s):  
Kun Liu ◽  
Chuan Jie Fang ◽  
Zhi Qiang Li ◽  
Fang Fang Fan ◽  
Jian Jian Han
Keyword(s):  
Binary Mixtures ◽  
Separation Factor ◽  
Sulfur Compounds ◽  
Swelling Degree ◽  
Arrhenius Relationship ◽  
Operation Temperature ◽  
The World ◽  
Preferential Sorption ◽  
Activity Energy

Reduction of organosulfurs in gasoline has become an urgent requirement in the world, especially in China. The goal of this work focuses on removal of thiophene from binary mixtures of thiophene and n-heptane by means of pervaporation. The PEBAX homogenous film was prepared by coating. The swelling experiments of film were studied for the affinity of PEBAX film to thiophene. The swelling degree of film increased with increasing thiophene content in the mixtures. The result indicates the PEBAX film had preferential sorption to thiophene rather than n-heptane. Pervaporation experiments were studied for investigating separation properties of the film. The effect of thiophene concentration in feed and operation temperature on separation properties of the film was researched. The results of pervaporation showed that both total and thiophene flux increased with increase of thiophene content in the feed and temperature, but the separation factor deceased with their increase. The activity energy was calculated according to the Arrhenius relationship. This work may offer useful visions into the possibility of the separation of sulfur compounds from gasoline via pervaporation.

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 Content of mineral- and sulphur compounds in Hungarian and French garlic varieties

2013 ◽  
Vol 19 (3-4) ◽  
Author(s):  
J. Iváncsics ◽  
Cs. Gombkötő ◽  
N. Gombkötő ◽  
Á. Máthé
Keyword(s):  
Amino Acids ◽  
Ancient Egypt ◽  
Sulfur Compounds ◽  
Sulphur Compounds ◽  
The World ◽  
Potassium Magnesium

In our days about 2 million tons of garlic are grown in the world. Garlic was used as medicine already in ancient Egypt. It contains approx 33 sulfur compounds, several enzymes, 17 amino acids and minerals. We determined the content of diallyl sulfone, boron, calcium, copper, iron, potassium, magnesium, natrium, phosphorus and zinc in fi ve garlic varieties (3 French, 2 Hungarian). We searched if there were signiffi cant differences between the varieties.

A Separation Factor Method for the Analysis of Ideal Binary Mixtures in Gas-Solid Adsorption

1984 ◽  
Vol 19 (2-3) ◽  
pp. 157-172 ◽  
Author(s):  
T. Victor Lee ◽  
Jan-Chan Huang ◽  
Richard Madey
Keyword(s):  
Binary Mixtures ◽  
Separation Factor ◽  
Factor Method

Removal of Hydrogen Sulfide from Gas Mixtures Using Membranes Impregnated with Ionic Liquids

2018 ◽  
Vol 7 (1) ◽  
pp. 31-37
Author(s):  
А. Ахметшина ◽  
A. Ahmetshina ◽  
А. Мечергуи ◽  
A. Mechergui ◽  
А. Петухов ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Hydrogen Sulfide ◽  
Transport Properties ◽  
Binary Mixtures ◽  
Separation Factor ◽  
Gas Mixtures ◽  
Porous Membranes ◽  
Acidic Gases ◽  
Gas Transport Properties

In this paper have been considered gas transport properties of porous membranes immobilized by 1-butyl‑3-methylimidazolium tetrafluoroborate (bmim [BF4]) and 1-butyl‑3-methylimidazolium acetate (bmim [ace]) toward CH4, CO2 and H2S. Have been investigated transport features of individual gases as well as theirs binary mixtures CO2/CH4 and H2S/CH4. It has been stated that for binary gas mixtures the highest efficiency of acidic gases separation is achieved on membranes containing bmim [ace]. It has been shown experimentally that for a membrane operating according to mechanism of simplified transport, the separation factor increases with diminishing of concentration for penetrant fixed by ionic liquid.

On the Distribution of Isotopes in a Separation Column in Countercurrent Electromigration of Molten Binary Mixtures

1983 ◽  
Vol 38 (2) ◽  
pp. 97-105
Author(s):  
Isao Okada ◽  
Arnold Lundén
Keyword(s):  
Binary Mixtures ◽  
Separation Factor ◽  
Heavy Isotope ◽  
Flow Equations ◽  
Isotope Distribution ◽  
Light Isotope ◽  
Separation Column ◽  
Common Anion

Abstract In countercurrent electromigration of molten binary mixtures with a common anion in which each cation is composed of two isotopes, the less mobile cation is enriched toward the anode, and, at the same time, the isotopes of this cation become distributed in a complicated way. Thus, the zone next to the anode where the heavy isotope is enriched is immediately followed by a region where a slight enrichment of the light isotope occurs, while for the more mobile cation the heavy isotope is enriched in both these regions. This phenomenon has been observed in experiments with the systems (Li-K)NO3 and (Li-K)Cl and it has also been reproduced by analyzing the flow equations for the constituent components numerically with a computer. It is verified that the existing formulation for the calculation of the elementary separation factor holds independent of whether there is such an anomaly in the isotope distribution for the less mobile cation.

scholarly journals Diseño y análisis energético de un sistema de refrigeración autónomo para el traslado de vacunas

2019 ◽  
pp. 14-23
Author(s):  
Julio Valle-Hernández ◽  
Britania Junery Lozano-Olmedo ◽  
Joanna Díaz-Monroy ◽  
Raúl Román-Aguilar
Keyword(s):  
Rural Areas ◽  
Energy Analysis ◽  
Electrical Energy ◽  
Photovoltaic System ◽  
Thermoelectric Coolers ◽  
Operation Temperature ◽  
The World ◽  
Solid State Devices ◽  
Portable System ◽  
System Energy

Vaccination is one of the most important methods of promoting health in the world, to preserve the effectiveness of these pharmacological products the operation temperature range in between 2°C and 8°C. Thermoelectric coolers are solid state devices that convert electrical energy into thermal energy, although they are destined to small capacities of cooling which are of the order of 2 to 250 watts, they are optimal for the cooling of portable systems. This paper describes the design and energy analysis of a portable system for the transfer of vaccines in rural areas, which will be powered by solar energy. The design integrates the choice of thermal insulation, geometry and operation of the system. Energy analysis allows to obtain the necessary energy to maintain the vaccines at temperatures between 4 ° C and 6 ° C, from the estimation of the thermal loads, and thus the election of the photovoltaic system best suited to ensure the necessary autonomy time.

scholarly journals A REVIEW ON POTENTIAL USES OF CULINARY VEGETABLES USED IN ROUTINE LIFE AS AN ANTICANCER AGENT

2018 ◽  
Vol 11 (8) ◽  
pp. 21 ◽  
Author(s):  
Lavanya B ◽  
Jayashree V ◽  
Jeevaraj S
Keyword(s):  
Breast Cancer ◽  
Anticancer Agent ◽  
Antioxidant Property ◽  
Sulfur Compounds ◽  
Breast Cancers ◽  
Anticancer Properties ◽  
Allium Vegetables ◽  
The World ◽  
Breast And Prostate Cancer ◽  
Cysteine Sulfoxide

Cancer is a disease which leads to death, and chemotherapy is a treatment used to treat cancer. Lung cancer and breast cancer are most effective one in the world. The present study examines the anticancer property of culinary vegetables such as Allium vegetables, cruciferous vegetables, and beetroot which are used in day-to-day life have anticancer properties. Allicin and gallic acid in garlic decreases the risk of colon, pancreas, stomach, esophagus, and breast cancers. In onion, cysteine sulfoxide is sulfur compounds which have ant-cancer, antiplatelet, and antithrombotic property. In broccoli, glucosinolates and sulfur compounds play a major role in the treatment of breast and prostate cancer. Betacyanin is a compound present in beetroot which has antioxidant property and anticancer activity.

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