توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱MERCURY ADSORPTION ON A CARBON SORBENT DERIVED FROM WALNUT SHELL
نویسنده(ها): ، ،
اطلاعات انتشار: دوازدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۱۰
A carbonaceous sorbent derived from an Iranian walnut shell (WS) were prepared by chemical activation method using ZnCl2 as an activating reagent. WS may be used in water treatment to remove mercury (Hg++) from water. The adsorption of mercury ion (Hg++) were performed from aqueous solutions at 302 K. Adsorption studies of Hg (II) were carried out by varying several conditions such as: treatment time, metal ion concentration, adsorbent amount, pH and solution temperature. It was also determined that Hg (II) adsorption follows both Langmuir and Freundlich isotherms. It was shown that Hg (II) uptake decreases with increasing pH of the solution. The monolayer sorption capacity was obtained as 151.5 mg\g.<\div>

۲A CORRELATION FOR SLIP VELOCITY IN HANSON MIXER–SETTLER EXTRACTION COLU MN
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۷
Characteristic velocity was obtained in a pilot plant Hanson mixer–settler extraction column of seven stages using three systems. In this paper, a set of previous characteristic velocity models presented in the past literatures were examined. Comparison between these models and the experimental results showed that although some of these equations may have satisfactory results, but they have to be more accuracy for design. So, a model for prediction of slip velocity was suggested in terms of total holdup and characteristic velocity which depends onphysical properties of liquid systems and operating variables. The comparison of experimental values of slip velocity was demonstrated good agreement with results of proposed model.<\div>

۳CFD modeling of subcritical water extraction
نویسنده(ها): ، ، ،
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۶
Subcritical water extraction (SWE) is a technique based on the use of water as an extractant. CFD modeling of extraction was considered in this work. As the temperature of liquid water is raised under pressure, between 100 and 374 ºC, the polarity decreases markedly and it can be used as an extraction solvent for a wide range of analytes. The model was verified successfully using the subcritical water extraction data for Zataria multiora Boiss. leaves at 20 bar and 150oC. The effect of temperature in CFD modeling was studied. The results indicate that increasing operating temperature from150 to 200°C increases the extraction concentration.<\div>

۴A REVIEW ON SOLUBILITY PREDICTION MODELS IN SUBCRITICAL WATER
نویسنده(ها): ،
اطلاعات انتشار: اولین همایش ملی تکنولوژی های نوین در شیمی و پتروشیمی، سال
تعداد صفحات: ۴
Subcritical water (SBCW) or hot pressurized water is defined as water with temperature between 100 and 374 and pressure high enough to maintain the liquid state. Under these conditions, because of decreasing the dielectric constant, water acts as a non–polar solvent and various organic compounds can dissolve in it. In some cases, modifiers are added to decrease the dielectric constant of water. Solubility data are important parameters and empirical measurements of solute solubility in SBCW are reported in many publications. Various models are available in the literatures for estimating the aqueous solubility of organic compounds in SBCW. Solubility models are needed to predict the solute solubility in SBCW before the experiments are performed. Also these solubility models are important when the process is scaled–up to a pilot or industrial scale. In this paper, a review of the solubility models for organic compounds in SBCW is presented. The models are empirical and semi–empirical models, regular solution theory (RST), dielectric constant model, cubic–plus–association (CPA) equation of state, and universal functional activity coefficient (UNIFAC) based models. An improved understanding of the interactions between SBCW and solute will lead to more accurate solubility models.<\div>

۵Study of mixing in Airlift bioreactor used in (bio) leaching process
نویسنده(ها): ، ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۹
Mixing is one of the most important parameters for designing and modeling in Airlift bioreactors.This parameter is depended on mixing time (<\div>

۶LLE data for separation of aromatic hydrocarbons (benzene and toluene) from aliphatic hydrocarbons (hexane and heptanes) with ethylene glycol solvent
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۸
In this research, LLE data for ternary system of (ethylene glycol + benzene + hexane) at 298.15 K and ternary system of (ethylene glycol + toluene + heptane) at temperatures (308.15 and313.15) K have been measured. The results showed that ethylene glycol as a solvent has a goodselectivity for separation of benzene from hexane and toluene from heptane. Comparing the electivity factors in two different temperatures indicated that, increasing temperature causes increasing selectivity factor<\div>
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