Brazilian Journal of Chemical Engineering 
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This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.ETHANOL PRODUCTION FROM SUGAR LIBERATED FROM Pinus SP. AND Eucalyptus SP. BIOMASS PRETREATED BY IONIC LIQUIDS
Abstract Pretreatment of lignocellulosic biomass using ionic liquids (ILs) has been widely studied and is considered one of the most promising methods to obtain fermentable sugars. However, few data exist on the fermentation of reducing sugars (RS) obtained by enzymatic hydrolysis of biomass pretreated with ionic liquids for the production of ethanol. Therefore, this study evaluated the production of ethanol from sugars liberated from sawdust of Pinus sp. and Eucalyptus sp. pretreated with ionic liquid [C4mim][OAc] and [C2mim][OAc], hydrolyzed with enzymes of Penicillium echinulatum employing Saccharomyces cerevisiae and S...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
PRODUCTION OF CELLULOLYTIC ENZYMES BY Gelatoporia subvermispora USING DIFFERENT SUBSTRATES
In this study the solid-state fermentation for production of cellulolytic enzymes by the fungus Gelatoporia subvermispora was optimized. The enzyme activities on filter paper, exo-cellulase, endo-cellulase and xylanase were determined. A Plackett-Burman design (PB) was used to determine the most significant variables (moisture content of substrate, inoculum density, corn steep liquor concentration, pH and peptone concentration) in the enzyme production for each substrate (sugarcane bagasse, sewage sludge and rice straw). The highest value for filter paper activity was obtained using sugarcane bagasse as substrate. The sewa...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
Model comparison to describe bhk-21 cell growth and metabolism in stirred tank bioreactors operated in batch mode
Abstract Baby Hamster Kidney cells (BHK-21) are commonly used in research and the biopharmaceutical industry. This work aimed to model the kinetic performance in batch operation mode of BHK-21 cells cultured in two stirred tank configurations using different dissolved oxygen concentrations and pH control strategies. Viable and dead cell concentrations, as well as glucose, glutamine, lactate and ammonium concentrations, were monitored. Statistical multiple linear regression, logistic equation and multiplicative Monod kinetic models were fitted. Statistical models for viable cells concentration as a function of nutrient and ...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
UTILIZATION OF AGROINDUSTRIAL BY-PRODUCTS AS SUBSTRATE IN ENDOGLUCANASE PRODUCTION BY Streptomyces diastaticus PA-01 UNDER SUBMERGED FERMENTATION
Abstract Endoglucanase production under submerged fermentation was studied using sugarcane bagasse (SCB) and oat bran (OB) as carbon source and corn steep liquor (CSL) as nitrogen source, in different concentrations using factorial design. Streptomyces diastaticus PA-01, isolated from a soil cave in Brazil, was selected as cellulolytic strain. The results after experimental validation showed that a medium containing 2.4% (w/v) SCB and 1.3% (w/v) CSL led to the highest production, 1,180.3 U.L-1 of endoglucanase, after the 5th-day. A good level of endoglucanase (1,039.3 U.L-1) was obtained after the 4th-day when 2.0% (w/v) O...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
Liquid-liquid equilibrium and kinetics of ethanolic extraction of soybean oil using ethyl acetate as co-solvent
Abstract This work reports a new set of experimental data for the liquid-liquid equilibrium (LLE) of the system (soybean oil + ethyl acetate + anhydrous ethanol) and the kinetics of crude oil extraction from soybean flakes using anhydrous ethanol + ethyl acetate mixtures. Data for the LLE binodal were measured at 298.15, 313.15 and 333.15K by the cloud point method and tie-lines were obtained at 298.15 and 313.15 K. LLE data were successfully modeled using the NRTL model. Batch extractions were performed at 298.15, 313.15 and 328.15 K at a fixed (4:1) solvent to soybean flake mass ratio and two concentration of ethyl aceta...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
Simulation and experimental study of methane-propane hydrate dissociation by high pressure differential scanning calorimetry
Abstract Binary and ternary systems composed of methane-water and methane-propane-water, respectively, were studied using high pressure differential scanning calorimetry. The methodology was validated by comparing results for the binary system to experimental data obtained in the literature. The hydrate dissociation temperatures for the ternary system (methane-propane-water) at 21 MPa were experimentally determined for different compositions of the gas mixture and mole fractions of propane higher than 0.1 in the ternary system. Our results are in good agreement with the values predicted by applying the Cubic Plus Associati...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
Strontium carbonate solubility data in aqueous mixtures of monoethyleneglycol under a carbon dioxide atmosphere
Abstract In order to inhibit natural gas hydrate formation, monoethyleneglycol (MEG) is usually injected into producing well heads. The MEG regeneration process is continuously performed at the platform. Scaling problems usually occur due to the presence of chlorides and carbonates. This work presents salt solubility data for the aqueous system with strontium carbonate, MEG and carbon dioxide. A specific analytical method was developed. Thus, experimental data for strontium carbonate (SrCO3) solubility at various carbon dioxide pressures are reported. Solubilities of SrCO3 in water were measured from 760 to 1610 mmHg at 27...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
Density, viscosity and excess properties of binary mixtures of protic ionic liquid (2-hdeaf, 2-hdeaa) + water at different temperatures
Abstract Over the last decade, ionic liquids (IL) have attracted considerable attention for their potential to replace traditional volatile organic solvents due to their well-known physico-chemistry properties. This is an important topic for industrial applications today, and have been the subject of extensive literature studies. Nevertheless, there is still a lack of experimental thermodynamics data on aqueous mixtures, i.e., ionic liquids + water, especially volumetric and transport properties. These data could provide essential information about interactions and molecular phenomena in such mixtures. To investigate volum...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
Liquid-liquid equilibrium of systems composed of soybean oil + monoacylglycerols + diacylglycerols + ethyl oleate + oleic acid + ethanol at 303.15 and 318.15 k
This study reports experimental results and thermodynamic modeling of the liquid-liquid equilibrium of systems composed of soybean oil + monoacylglycerols + diacylglycerols + ethyl oleate + oleic acid + ethanol at 303.15 and 318.15 K. Experimental data were well correlated using NRTL, with a maximum deviation of 0.688%. As for UNIFAC, the deviations between predicted and experimental data ranged from 3.13 to 9.21%. (Source: Brazilian Journal of Chemical Engineering)
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
THERMODYNAMIC MODELING OF AZEOTROPIC MIXTURES WITH [EMIM][TfO] WITH CUBIC-PLUS-ASSOCIATION AND CUBIC EOSs
Abstract Ionic liquids (ILs) are organic salts that are liquids at room temperature and have low vapor pressure. These characteristics render ILs potential substitutes of organic solvents and inorganic salts in separation of azeotropic mixtures. This work presents vapor-liquid equilibrium modeling of the azeotropic mixture acetone + methanol + 1-ethyl-3-methylimidazolium-trifluoromethanesulfonate and ethanol + water + 1-ethyl-3-methylimidazolium-trifluoromethanesulfonate with the Cubic-Plus-Association Equation of State (CPA EoS). The azeotropic ternary mixture phase behavior was properly predicted using binary interaction...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
THE USE OF COMPRESSED FLUIDS TO OBTAIN BIOCOMPOSITES FROM PALM OIL FIBER (Elaeis sp.)
The objective of this work is to fragment the EFBF employing pressurized fluids in a semi-continuous system to obtain different biocomposites. For this, pure water and a mixture of water/carbon dioxide were employed as solvent to obtain sugar monomers and a mixture of compressed water/ethanol (1:1 vol.) to obtain crystalline cellulose. The experiments were conducted in the temperature range of 120 to 240 ºC, using reaction times between 5 and 15 min at 60 bar, and solvent flow rate of 0.75 mL.min-1. A maximum of 30.47 mg.mL-1 of xylose was obtained at 210 ºC for 15 min of reaction with pure water as solvent. The best con...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
Vapor-liquid equilibrium calculation for simulation of bioethanol concentration from sugarcane
ABSTRACT The robustness of the simulation of bioethanol concentration from sugarcane faces two major challenges: the presence of several minor components and the nonlinear behavior of vapor-liquid equilibrium (VLE) calculations. This work assesses the effect of simplifications to overcome these difficulties. From a set of seventeen substances, methanol, n-propanol, isobutanol, 2-methyl-1-butanol and 3-methyl-1-butanol were selected through the examination of the influence of each minor component on vapor-liquid equilibrium calculations of ethanol-water-third component systems. The selection procedure was based on Txy diagr...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
Optimization of the extraction of free fatty acids applied to biodiesel production
Abstract The liquid-liquid extraction of free fatty acids (FFA) from residual oils and fats for biodiesel production, employing methanol as the solvent, has been optimized using process simulation and response surface methodology. The parameters investigated were temperature, number of stages and solvent-to-feed ratio (S/F). Responses evaluated were FFA mass fraction in the oil-rich phase ( w FFA B) and total cost, using yellow and brown greases as the raw materials. Quadratic and linear models were fitted for w FFA B and cost responses, respectively. The optimal conditions satisfying technical ( w FFA B ≤ ...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
Pvt experimental and modelling study of some shale reservoir fluids from argentina
Abstract Shale reservoir fluids have been receiving much attention, especially during the last decade, due to the important reserves confirmed in many places around the world and the recent production growth in the United States, Argentina, and probably other countries to follow. In some fields of the Vaca Muerta formation in Argentina, the fluids can be classified as gas condensate or near-critical in some cases, presenting retrograde condensation of up to 30% in volume. This work presents compositional and PVT data of two gas condensate fluids, together with a new methodology for assigning molecular weights and densities...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
Liquid-liquid equilibria data of n-methyl-2-hydroxyethyl ammonium alkylates with butanol+water and pentanol+water at 293.15k, 313.15k and 333.15k
Abstract Ionic liquids (ILs) are organic salts with low volatility and have different applications including organic synthesis, separation and extraction processes, fuel cell electrolyte, surfactants, among others. Protic ILs based on the N-methyl-2-hydroxyethyl ammonium cation and short chain carboxylic anions have simple synthesis and purification. However, as new substances few data are available for their thermodynamic properties and phase equilibria. In order to investigate the partition of these substances in alcohol-water, liquid-liquid equilibria data were determined experimentally for three ionic liquids (formed b...
Source: Brazilian Journal of Chemical Engineering - October 5, 2018 Category: Chemistry Source Type: research
