توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Feasibility study on managing of hazardous material in steel factory
نویسنده(ها): ، ، ،
اطلاعات انتشار: چهارمین همایش تخصصی مهندسی محیط زیست، سال
تعداد صفحات: ۱۰
Worldwide there is an increasing emphasis on environmental issues and steel industry is under intense security there for management of solid waste is one of the major challenges facing this industry. During producing steel generate many kind of hazardous solid waste such as spent catalyst, refractory material, sludge, furnace slag and dust. This paper has reviewed managing these solid wastes. Literature showed Nickel can be recovered from spent reforming catalyst, and discussed about application of some of these waste in cement and building industries such as slag, iron oxide dust and sludge. Steel sludge can be used in Portland cement additive as row material for producing clinker. Vanadium is one of valuable heavy metal can extracted from furnace slag also it can be applied for producing glass wool. Direct reduction iron (DRI) can be used for cold briquetting and briquette will be charged to melting furnace as feed but iron oxide returned to pelletize unit again to producing pellet.<\div>

۲Application of sweeping gas membrane distillation for concentration of glucose syrup
نویسنده(ها): ، ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۶
In this work, a sweeping gas membrane distillation process has been used for concentration of glucose syrup. The effect of operating variables includ ng feed temperature (45, 55, 65 and 75oC), feed concentration (10, 30, 50 and 150g\l), feed flow rate (200, 400 and 600 ml\min) and sweeping gas flow rate (4, 10 and 16 SCFH) has been investigated. A flat sheet membrane made of PTFE mounted on a plate and frame module made of Plexiglass used for experiments. Results shown that the feed temperature is the most effective parameter on the permeate flux. Increase of concentration led to decrease of flux due to concentration polarization effect. Both feed flow rate and sweeping gas flow rate are affect the permeate flux.<\div>

۳Modeling of a membrane system for nitrogen removal from natural gas
نویسنده(ها): ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۱۰
Removal nitrogen from natural gas is expensive processes that can cause non–economical development of fields contain high nitrogen. Natural gas reserves contain more than 4% nitrogen must to treatment. Cryogenic distillation is the only process used on a large scale in this subject. Many small gas wells are shut in for lack of suitable small–scale nitrogen separation technology. One of the useful technologies regarding separation N2\CH4 especially for small fields is pressure swing adsorption (PSA) that preferentially adsorbs nitrogen and another technology is membrane separation. Generally spiral wound modules are used in gas separation. So in this study, an approximate modeling technique for spiral wound membranes for separating binary gas is used for investigation of effects of increase membrane area and feed parameters in N2\CH4 Separation. Approximate model is derived directly from a standard fundamental model by assuming that residue flow rate is constant in the direction of permeate flow.<\div>

۴Modeling of ternary gas separation in hollow fiber membrane
نویسنده(ها): ، ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۶
A mathematical model was established to describe a hollow fiber membrane separator by ternary gases which including hydrogen, methane and carbon monoxide. This model can be used forsimulation, design and operation of membrane–based gas separation processes. The mathematicalmodel consists of equations for the conservation of mass and momentum, which allows the consideration of effects such as pressure drops and various flow patterns within the permeator. Themethod of solution for the set of differential equations employs finite difference which replaces each of the differential equations by the corresponding finite difference expression. In the current implementation, membrane modules with concurrent or countercurrent flows and permeate pressure drops can be handled. Numerical results covering effects of different feed and permeate pressures on the design and operation of hollow fiber permeator.<\div>

۵Influence of temperature and polymer mass fraction on density of polyetherimide solution in N–methyl–2–pyrrolidone and Chloroform solvents
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۵
The density values of polyetherimide solutions in N–methyl–2–pyrrolidone (NMP) and Chloroform solvents have been measured at T = (298.15, 303.15, 308.15, and 313.15) K. The range of (0.05–0.3)for PEI mass fraction in NMP and (0.05–0.28) in Chloroform have been selected. Apparent specificvolume of the polymer and solvent has been computed from experimental data. Influence of temperature and polymer mass fraction on density of polyetherimide solution have been investigated. Results show density of both solutions will decrease by increasing temperature linearly.Also Densityfollowed a linear behavior with solute mass fraction, but for NMP, density will increase by increasing solute mass fraction and for Chloroform it will decrease.<\div>

۶Evaluation of 4–chlorophenol extraction from aqueous solution by kerosene
نویسنده(ها): ، ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۷
Phenolic compounds are among of the important chemicals having uses in production of several important industrial chemicals such as pesticides, explosives, drugs and dyes, synthetic fibers such as nylon, epoxy resin precursors such as bisphenol–A, etc. The production of phenolic compounds produces hazardous wastes and wastewaters. Biological treatment (activated sludge) of these wastewaters is difficult because of anti–biological properties of phenols so,other treatment processes should be considered such as solvent extraction, chemical oxidation, photo–catalytic oxidation, etc. In this paper the behavior of 4–chlorophenol during the extraction from aqueous solutions using kerosene as solvent was studied. The influence of the initial concentration of phenol in aqueous phase (100–500 ppm), pH (1–6) and temperature (20–50 ○C) was investigated. In equilibrium extraction of 4–chlorophenol with kerosene was observed that the extraction efficiency increases with increasing temperature. Experimental results showed that as the pH of the feed solution decreases, the extraction efficiency increases that is because of that in the acidic solutions all of the phenol present in solution are in its molecular form and have the capability to extract. The effect of concentration on the extraction efficiency is low.<\div>

۷Critical concentration determination of polyetherimide membrane for gas separation
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۶
In preparation of gas separation membrane, polymer concentration is one of the most important variables which can change membrane morphology and behavior. It should be high as polymer chains engage with each other and made dense membrane for gas separation, in this concentrationviscosity of polymeric solution has quirk. This concentration is called critical concentration. The studies on gas permeation in Polyetherimide (PEI) dense film reveal that PEI exhibits impressively high selectivity for all important gas pairs, there are a few solvents for PEI, in this research critical concentration of PEI in N–methyl–2–pyrrolidone and chloroform have been investigated.<\div>
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