فهرست مطالب

دوماهنامه مهندسی شیمی ایران
پیاپی 21 (فروردین و اردیبهشت 1385)

108 صفحه، بهای روی جلد: 6,000ريال
تاریخ انتشار: 1385/02/25
تعداد عناوین: 14

فارسی
English

انتخاب همه

Study on Separation Process of SO2 from Air

M. Semnani Rahbar Page 4

Sulfur dioxide is an important air pollutant which is main parameter of production of acid rain. Due to sever act, recently, the amount of SO2 in air was decreased, but, industrial separation process of SO2 from air is still an interesting subject. SO2 can be separated by different processes: 1- Separation by aromatic amines solution by Asarco and Sulfidine processes.2- Absorption in aqueous ammonium salt solution by process of Fulham-Simon-Carves3- Separation by aqueous alkaline earth metal salt solutions In this investigation, basic principles of the processes, properties of the solutions, operation data and efficiency of separation have been studied. The results show that Fulham-Simon-Carves process was applied in pilot plant scale and its efficiency isn’t comparable in industrial application. The process which consist aqueous alkaline earth metal salt solutions, isn’t efficient due to high maintenance and repair cost and precipitated solids and low degree of separation. Consequently, the processes which use amines solution are suitable ones for separation of SO2 from air.

Abstract View Paper Original: Persian
A Review on Industrial Application, Research and Future Trend of Pervaporation

F. Shahraki, M. Zivdar, M. Mahdavian Page 19

Pervaporation is a technique that its situation to be confirm among separation processes. Because of the potential industrial utility of this approach, Pervaporation is considered to be a promising alternative to conventional separation technologies. Applications like Dehydration of organic liquids and removal of trace volatile organic compounds from aqueous solution has been done in large scale. In recent years, the use of pervaporation technology for the separation of organic–organic mixtures has attracted significant attention of the researchers. In this work industrial applications of prevaporation and its potential at new application have been mentioned and recent research, future trend and problem face to this technology has been explained.

Abstract View Paper Original: Persian
Reducing Pirit Sulfur of Tabas Coal with Ferric Chloride Solution

H.Ebrahimi, M.Zivdar, M.R.Ehsani Page 32

Desulfurization of washed Parvadeh Tabas Coal by using Ferric chloride has been investigated, at different operating conditions such as; Concentration of Ferric chloride, particle size, temperature, acidity and residence time. The results show that, this method is capable of reducing only Pirit sulfur, in the range 25.48% to 90.5% (w/w), and total sulfur from 16.61% to 60% (w/w). This method shows no side effect on coke number and structure of the coal.

Abstract View Paper Original: Persian
Beetroot Pigments, Their Application and Selection of Suitable Drier

P. Nahid, I. Alemzadeh, R. Shahidipoor Page 49

Beetroot is an excellent source of food pigments (betalains) and because of the high quantity of betalains, their extraction is commercially economic. These natural pigments have been recognized as food colours and their strength is more than many synthetic colours. The carboxyl and amine groops have been seen in their structures and they are coloured because of their resonating structures. Betalains (red betacyanin, yellow betaxanthin) contain %1-0.4 pigments, %80 sugar, %8 ash and %10 protein. The quantity of their colour is depend on the amount of betaxanthin. Betanin (betacyanin with glucose) is more stable than synthetic colours. Most pink icecream in Germany and the UK contains betanin in the range 15 to 25 ppm. The main processes in betalain extraction are thermal processing, crushing, concentration under vacuum and drying. Selection of the drier is the difficult part, so a few kinds of driers such as rotary, spray, tray and fluidized bed driers were studied. Spray driers (medium size) seem to be more efficient from economic viewpoints.Methods such as ion exchange, gel chromatography, fermentation and in vitro cell suspension are used to purify betalains. The last method is more advantageous. The application of biotechnology methods such as fermentation in production of red beet concentrate after removal of sugars and reduction of the yellow pigment, though more expensive than traditional methods but is qualified for the today`s world market.

Abstract View Paper Original: Persian
Solubility of Alpha Pinen by Peng Robinson EOS

J.Ahmadpour, F.Varaminian Page 57

The peng robinson equation of state was used for calculation of solubility of alpha pinene (one of the important component of rosemary essence) in supercritical carbon dioxide.The binary interaction parameters for the equation of state are calculated for temperature range (40 to 45 C) and pressure up to 12 MPa. There was a good agreement between experimental data and calculated solubilities.

Abstract View Paper Original: Persian
Regeneration of Activated Carbons

S.S. Ahmadpanah, M.N.Lotfollahi, A. Haghighi Asl Page 63

Activated Carbons are unique and versatile adsorbents because of their extended surface area, micro-porous structure, high adsorption capacity, and high degree of surface reactivities. They are extensively used to purify, decolorize, deodorize, dechlorinate, and detoxicate potable waters in petroleum, gas, petrochemical, food and wastewater treatment industries. Several methods are proposed to regenerate the spent activated carbon in literature. In this paper these methods such as thermal, chemical, electrochemical, catalytic, biological and super-sonic are described and compared.

Abstract View Paper Original: Persian
Efficiency Measurement of Silica In a Pressurized Sand Filter to Remove Oil and Suspended Solids from Desalting Plant Wastewater

Masoud Matinfard Page 75

The lack of Pressurized Sand Filters in waste water treatment of desalting plants causes some problems like plugging of injection wells, scaling in the pumping system of transfer pipe lines and waste water injection in the disposal wells. In addition to the operational and economic difficulties, waste water disposal to the environment has produced a lot of acute banal environmental impact problems. Because of the impossibility of supplying the material garnet which constituted bed of the filters these apparatuses had been out of the waste water treatment services. To rehabilitate the filters, sand particles and activated carbons were supplied from Iran's market and loaded in the filters. Then efficiency of these filters was determined for oil and suspended solids removal from wastewater. This report reflects the result. The results indicated that the performance of the new media in decreasing pollutant load were well and acceptable. The new media is capable to remove 55 percent oil and 65-70 percent solids from desalting plant waste water.

Abstract View Paper Original: Persian
Investigation of Electrophoretic Effect in Alternative Electric Fields Using Capilary Electrophoresis

I.Frasat, J. Shayegan, M.Hosseni Page 83

Electrophoresis is one of the most important methods for macromolecules separation in the cell systems. High capacity and power, lower operating cost and simplicity in operation are the main advantages of this technique. The technique is also very common for proteins separation. In the present work, a general mathematical model is driven by analyzing and modifying the existing equations and then by extending this generalized model, the electrophoresis effect is also studied in alternative electric fields.

Abstract View Paper Original: Persian