The Experts below are selected from a list of 19071 Experts worldwide ranked by ideXlab platform
Carmen Pazos - One of the best experts on this subject based on the ideXlab platform.
-
treatment of a waste oil in water emulsion from a copper rolling process by ultrafiltration and Vacuum Evaporation
Journal of Hazardous Materials, 2011Co-Authors: Gemma Gutiérrez, José M. Benito, José Coca, Alberto Lobo, Carmen PazosAbstract:A process is proposed for the treatment of a waste oil-in-water (O/W) emulsion generated in an industrial copper-rolling operation. The use of demulsifier agents improves the subsequent treatment by techniques such as ultrafiltration (UF) or Evaporation. The effluent COD is reduced up to 50% when the O/W emulsion is treated by UF using a flat 30 nm TiO(2) ceramic membrane (ΔP = 0.1 MPa) and up to 70% when it is treated by Vacuum Evaporation, after an emulsion destabilization pretreatment in both cases. Increases in the UF permeate flux and in the Evaporation rate are observed when a chemical demulsifier is used in the pretreatment step. A combined process consisting of destabilization/settling, UF, and Vacuum Evaporation can yield a very high-quality aqueous effluent that could be used for process cooling or emulsion reformulation.
-
Vacuum Evaporation of Waste Oil-in-Water Emulsions from a Copper Metalworking Industry
Industrial & Engineering Chemistry Research, 2009Co-Authors: Gemma Gutiérrez, José M. Benito, José Coca, Carmen PazosAbstract:The performance of Vacuum Evaporation was evaluated for the treatment of waste oil-in-water (O/W) emulsions, one synthetic (Multiroll) and two semisynthetic (Unopol and Divinol), used in a copper m...
-
the effect of additives on the treatment of oil in water emulsions by Vacuum Evaporation
Journal of Hazardous Materials, 2007Co-Authors: Gemma Gutiérrez, José M. Benito, Carmen Pazos, Angel Cambiella, José CocaAbstract:A simple batch Vacuum Evaporation process for the treatment of several oil-in-water (O/W) emulsions is reported. The experiments were carried out with waste emulsions from an industrial copper rolling process and with model emulsions prepared in the laboratory. No detailed information on the formulation of the industrial waste O/W emulsions was available. Several model emulsions were formulated using the same base oil (an 85-15% (w/w) mixture of a synthetic poly-alpha-olefin and a trimethylol propane trioleate ester, respectively) and one of the three following surfactants: Brij-76 (polyethylene glycol octadecyl ether, non-ionic), CTAB (hexadecyltrimethyl ammonium bromide, cationic), and Oleth-10 (glycolic acid ethoxylate oleyl ether, anionic). Experimental results show a strong influence of operating conditions, such as pressure or bath temperature, on the Evaporation performance. As a general trend, the higher the values of these parameters, the higher the pollutant content in the obtained aqueous effluent. The presence of surfactants increase the Evaporation rate, especially at low operating Vacuum pressures, the solubility of oil molecules in water and the Evaporation temperature of model O/W emulsions. Furthermore, COD reductions higher than 99.5% for the treated waste O/W emulsions were achieved.
Gemma Gutiérrez - One of the best experts on this subject based on the ideXlab platform.
-
treatment of a waste oil in water emulsion from a copper rolling process by ultrafiltration and Vacuum Evaporation
Journal of Hazardous Materials, 2011Co-Authors: Gemma Gutiérrez, José M. Benito, José Coca, Alberto Lobo, Carmen PazosAbstract:A process is proposed for the treatment of a waste oil-in-water (O/W) emulsion generated in an industrial copper-rolling operation. The use of demulsifier agents improves the subsequent treatment by techniques such as ultrafiltration (UF) or Evaporation. The effluent COD is reduced up to 50% when the O/W emulsion is treated by UF using a flat 30 nm TiO(2) ceramic membrane (ΔP = 0.1 MPa) and up to 70% when it is treated by Vacuum Evaporation, after an emulsion destabilization pretreatment in both cases. Increases in the UF permeate flux and in the Evaporation rate are observed when a chemical demulsifier is used in the pretreatment step. A combined process consisting of destabilization/settling, UF, and Vacuum Evaporation can yield a very high-quality aqueous effluent that could be used for process cooling or emulsion reformulation.
-
Vacuum Evaporation of Waste Oil-in-Water Emulsions from a Copper Metalworking Industry
Industrial & Engineering Chemistry Research, 2009Co-Authors: Gemma Gutiérrez, José M. Benito, José Coca, Carmen PazosAbstract:The performance of Vacuum Evaporation was evaluated for the treatment of waste oil-in-water (O/W) emulsions, one synthetic (Multiroll) and two semisynthetic (Unopol and Divinol), used in a copper m...
-
the effect of additives on the treatment of oil in water emulsions by Vacuum Evaporation
Journal of Hazardous Materials, 2007Co-Authors: Gemma Gutiérrez, José M. Benito, Carmen Pazos, Angel Cambiella, José CocaAbstract:A simple batch Vacuum Evaporation process for the treatment of several oil-in-water (O/W) emulsions is reported. The experiments were carried out with waste emulsions from an industrial copper rolling process and with model emulsions prepared in the laboratory. No detailed information on the formulation of the industrial waste O/W emulsions was available. Several model emulsions were formulated using the same base oil (an 85-15% (w/w) mixture of a synthetic poly-alpha-olefin and a trimethylol propane trioleate ester, respectively) and one of the three following surfactants: Brij-76 (polyethylene glycol octadecyl ether, non-ionic), CTAB (hexadecyltrimethyl ammonium bromide, cationic), and Oleth-10 (glycolic acid ethoxylate oleyl ether, anionic). Experimental results show a strong influence of operating conditions, such as pressure or bath temperature, on the Evaporation performance. As a general trend, the higher the values of these parameters, the higher the pollutant content in the obtained aqueous effluent. The presence of surfactants increase the Evaporation rate, especially at low operating Vacuum pressures, the solubility of oil molecules in water and the Evaporation temperature of model O/W emulsions. Furthermore, COD reductions higher than 99.5% for the treated waste O/W emulsions were achieved.
José Coca - One of the best experts on this subject based on the ideXlab platform.
-
treatment of a waste oil in water emulsion from a copper rolling process by ultrafiltration and Vacuum Evaporation
Journal of Hazardous Materials, 2011Co-Authors: Gemma Gutiérrez, José M. Benito, José Coca, Alberto Lobo, Carmen PazosAbstract:A process is proposed for the treatment of a waste oil-in-water (O/W) emulsion generated in an industrial copper-rolling operation. The use of demulsifier agents improves the subsequent treatment by techniques such as ultrafiltration (UF) or Evaporation. The effluent COD is reduced up to 50% when the O/W emulsion is treated by UF using a flat 30 nm TiO(2) ceramic membrane (ΔP = 0.1 MPa) and up to 70% when it is treated by Vacuum Evaporation, after an emulsion destabilization pretreatment in both cases. Increases in the UF permeate flux and in the Evaporation rate are observed when a chemical demulsifier is used in the pretreatment step. A combined process consisting of destabilization/settling, UF, and Vacuum Evaporation can yield a very high-quality aqueous effluent that could be used for process cooling or emulsion reformulation.
-
Vacuum Evaporation of Waste Oil-in-Water Emulsions from a Copper Metalworking Industry
Industrial & Engineering Chemistry Research, 2009Co-Authors: Gemma Gutiérrez, José M. Benito, José Coca, Carmen PazosAbstract:The performance of Vacuum Evaporation was evaluated for the treatment of waste oil-in-water (O/W) emulsions, one synthetic (Multiroll) and two semisynthetic (Unopol and Divinol), used in a copper m...
-
the effect of additives on the treatment of oil in water emulsions by Vacuum Evaporation
Journal of Hazardous Materials, 2007Co-Authors: Gemma Gutiérrez, José M. Benito, Carmen Pazos, Angel Cambiella, José CocaAbstract:A simple batch Vacuum Evaporation process for the treatment of several oil-in-water (O/W) emulsions is reported. The experiments were carried out with waste emulsions from an industrial copper rolling process and with model emulsions prepared in the laboratory. No detailed information on the formulation of the industrial waste O/W emulsions was available. Several model emulsions were formulated using the same base oil (an 85-15% (w/w) mixture of a synthetic poly-alpha-olefin and a trimethylol propane trioleate ester, respectively) and one of the three following surfactants: Brij-76 (polyethylene glycol octadecyl ether, non-ionic), CTAB (hexadecyltrimethyl ammonium bromide, cationic), and Oleth-10 (glycolic acid ethoxylate oleyl ether, anionic). Experimental results show a strong influence of operating conditions, such as pressure or bath temperature, on the Evaporation performance. As a general trend, the higher the values of these parameters, the higher the pollutant content in the obtained aqueous effluent. The presence of surfactants increase the Evaporation rate, especially at low operating Vacuum pressures, the solubility of oil molecules in water and the Evaporation temperature of model O/W emulsions. Furthermore, COD reductions higher than 99.5% for the treated waste O/W emulsions were achieved.
José M. Benito - One of the best experts on this subject based on the ideXlab platform.
-
treatment of a waste oil in water emulsion from a copper rolling process by ultrafiltration and Vacuum Evaporation
Journal of Hazardous Materials, 2011Co-Authors: Gemma Gutiérrez, José M. Benito, José Coca, Alberto Lobo, Carmen PazosAbstract:A process is proposed for the treatment of a waste oil-in-water (O/W) emulsion generated in an industrial copper-rolling operation. The use of demulsifier agents improves the subsequent treatment by techniques such as ultrafiltration (UF) or Evaporation. The effluent COD is reduced up to 50% when the O/W emulsion is treated by UF using a flat 30 nm TiO(2) ceramic membrane (ΔP = 0.1 MPa) and up to 70% when it is treated by Vacuum Evaporation, after an emulsion destabilization pretreatment in both cases. Increases in the UF permeate flux and in the Evaporation rate are observed when a chemical demulsifier is used in the pretreatment step. A combined process consisting of destabilization/settling, UF, and Vacuum Evaporation can yield a very high-quality aqueous effluent that could be used for process cooling or emulsion reformulation.
-
Vacuum Evaporation of Waste Oil-in-Water Emulsions from a Copper Metalworking Industry
Industrial & Engineering Chemistry Research, 2009Co-Authors: Gemma Gutiérrez, José M. Benito, José Coca, Carmen PazosAbstract:The performance of Vacuum Evaporation was evaluated for the treatment of waste oil-in-water (O/W) emulsions, one synthetic (Multiroll) and two semisynthetic (Unopol and Divinol), used in a copper m...
-
the effect of additives on the treatment of oil in water emulsions by Vacuum Evaporation
Journal of Hazardous Materials, 2007Co-Authors: Gemma Gutiérrez, José M. Benito, Carmen Pazos, Angel Cambiella, José CocaAbstract:A simple batch Vacuum Evaporation process for the treatment of several oil-in-water (O/W) emulsions is reported. The experiments were carried out with waste emulsions from an industrial copper rolling process and with model emulsions prepared in the laboratory. No detailed information on the formulation of the industrial waste O/W emulsions was available. Several model emulsions were formulated using the same base oil (an 85-15% (w/w) mixture of a synthetic poly-alpha-olefin and a trimethylol propane trioleate ester, respectively) and one of the three following surfactants: Brij-76 (polyethylene glycol octadecyl ether, non-ionic), CTAB (hexadecyltrimethyl ammonium bromide, cationic), and Oleth-10 (glycolic acid ethoxylate oleyl ether, anionic). Experimental results show a strong influence of operating conditions, such as pressure or bath temperature, on the Evaporation performance. As a general trend, the higher the values of these parameters, the higher the pollutant content in the obtained aqueous effluent. The presence of surfactants increase the Evaporation rate, especially at low operating Vacuum pressures, the solubility of oil molecules in water and the Evaporation temperature of model O/W emulsions. Furthermore, COD reductions higher than 99.5% for the treated waste O/W emulsions were achieved.
Michele Vitolo - One of the best experts on this subject based on the ideXlab platform.
-
response surface methodology for xylitol production from sugarcane bagasse hemicellulosic hydrolyzate using controlled Vacuum Evaporation process variables
Process Biochemistry, 2003Co-Authors: Rita C L B Rodrigues, Maria Das Gracas De Almeida Felipe, Joao Almeida B E Silva, Michele VitoloAbstract:Abstract An effective bioconversion of xylose into xylitol by Candida guilliermondii FTI 20037 requires sugarcane bagasse hydrolyzate with a high level of xylose and a low concentrations of toxic compounds. The composition of the hydrolyzate depends on the Vacuum Evaporation process variables (pH, temperature, xylose concentration degree and treatment with activated charcoal before or after the process). The influence of these variables on xylitol volumetric productivity was measured using a 25−1 fractional factorial central composite design followed by a response surface methodology. The model predicted a xylitol volumetric productivity of 0.350 g/l h in hydrolyzate treated with charcoal (pH 0.92) and subsequently evaporated under Vacuum to reach a xylose concentration of 51.0 g/l. Under these conditions, the xylose, acetic acid and arabinose consumption levels were 93, 57 and 13.62%, respectively, and xylitol yield and production were 0.54 g/g and 24.33 g/l, respectively. The final cell concentration was fivefold, the initial value (0.278×108 cell/ml). The temperature levels (43–80 °C) tested during Vacuum Evaporation did not influence xylitol production significantly.
-
the influence of ph temperature and hydrolyzate concentration on the removal of volatile and nonvolatile compounds from sugarcane bagasse hemicellulosic hydrolyzate treated with activated charcoal before or after Vacuum Evaporation
Brazilian Journal of Chemical Engineering, 2001Co-Authors: Rita C L B Rodrigues, Maria Das Gracas De Almeida Felipe, J Almeida B E Silva, Michele Vitolo, P V GomezAbstract:This paper analyzes the influence of pH, temperature and degree of hydrolyzate concentration on the removal of volatile and nonvolatile compounds from sugarcane bagasse hemicellulosic hydrolyzate treated with activated charcoal before or after the Vacuum Evaporation process. Furfural and 5-Hydroxymethylfurfural were almost totally removed in all the experiments, irrespective of pH and temperature and whether the charcoal was added before or after the Vacuum Evaporation process. Adding activated charcoal before the Vacuum Evaporation process favored the removal of phenolic compounds for all values of pH. Acetic acid, on the contrary, was most effectively removed when the activated charcoal was added after the Vacuum Evaporation process at an acid pH (0.92) and at the highest degree of hydrolyzate concentration (f=4). However, addition of activated charcoal before or after Vacuum Evaporation at an acid pH (0.92) and at the highest degree of hydrolyzate concentration (f=4) favored the removal of both acetic acid and phenolic compounds.