The Experts below are selected from a list of 23360850 Experts worldwide ranked by ideXlab platform
Earl Goetheer - One of the best experts on this subject based on the ideXlab platform.
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Field study of a Brownian Demister Unit to reduce aerosol based emission from a Post Combustion CO2 Capture plant
International Journal of Greenhouse Gas Control, 2014Co-Authors: Purvil Khakharia, Hanne M. Kvamsdal, Eirik F. Da Silva, Thijs J. H. Vlugt, Earl GoetheerAbstract:Emission of solvent and its degradation products from a typical absorption-desorption based Post Combustion CO2 Capture (PCCC) process is inevitable and thus, an area of growing concern. Recently, it has been pointed out that emissions can also occur by means of aerosol droplets. Conventional counter-measures such as a water wash and a demister are highly effective in reducing vapour based solvent emissions ( 97%). The MEA emission levels consisted of both vapour and aerosol droplets. Thus, the water wash is capable of lowering vapour based emissions while, the BDU removes only aerosol based emissions. The measured concentrations of nitrosamines (N-nitrosodimethylamine, NDMA; N-morpholine, NMOR; N-Nitrosodiethanolamine, NDELA) in the treated flue gas stream from the absorber are very low and in the order of 10ng/Nm3. Ammonia emission levels were in the range of 10-70mg/Nm3. A major disadvantage of the BDU is its high pressure drop. The BDU led to a pressure drop increase of about 50mbar which is considered to be quite significant considering the total volume of gas to be processed. Based on a rough estimate, the BDU would lead to an increase of 26-52% in the electricity consumption and 1€/tonne of CO2 in operating cost, for a full scale CO2 capture plant.
William A Mitch - One of the best experts on this subject based on the ideXlab platform.
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predicting n nitrosamines n nitrosodiethanolamine as a significant component of total n nitrosamines in recycled wastewater
Environmental Science and Technology Letters, 2015Co-Authors: Teng Zeng, William A MitchAbstract:N-Nitrosamines are key contaminants of concern for wastewater reuse. Although research has focused on N-nitrosodimethylamine (NDMA), measurements indicate that NDMA accounts for only ∼9% of total N-nitrosamines in wastewaters, similar to previous findings in drinking and recreational waters. Recognizing the limited time scale for biological transformation during wastewater treatment, we targeted N-Nitrosodiethanolamine (NDELA) as a component of total N-nitrosamines based upon the widespread usage of its triethanolamine precursor in consumer products. NDELA accounted for ∼6% of total N-nitrosamines, exceeding NDMA concentrations in some cases, and those of all other specific N-nitrosamines measured. While ozone and chloramines increased NDMA concentrations by up to an order of magnitude, and chloramines increased NDELA concentrations in some cases, other N-nitrosamine concentrations did not increase. Total N-nitrosamine concentrations increased by only 38–89% during ozonation and 23–65% during chloraminati...
Purvil Khakharia - One of the best experts on this subject based on the ideXlab platform.
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Field study of a Brownian Demister Unit to reduce aerosol based emission from a Post Combustion CO2 Capture plant
International Journal of Greenhouse Gas Control, 2014Co-Authors: Purvil Khakharia, Hanne M. Kvamsdal, Eirik F. Da Silva, Thijs J. H. Vlugt, Earl GoetheerAbstract:Emission of solvent and its degradation products from a typical absorption-desorption based Post Combustion CO2 Capture (PCCC) process is inevitable and thus, an area of growing concern. Recently, it has been pointed out that emissions can also occur by means of aerosol droplets. Conventional counter-measures such as a water wash and a demister are highly effective in reducing vapour based solvent emissions ( 97%). The MEA emission levels consisted of both vapour and aerosol droplets. Thus, the water wash is capable of lowering vapour based emissions while, the BDU removes only aerosol based emissions. The measured concentrations of nitrosamines (N-nitrosodimethylamine, NDMA; N-morpholine, NMOR; N-Nitrosodiethanolamine, NDELA) in the treated flue gas stream from the absorber are very low and in the order of 10ng/Nm3. Ammonia emission levels were in the range of 10-70mg/Nm3. A major disadvantage of the BDU is its high pressure drop. The BDU led to a pressure drop increase of about 50mbar which is considered to be quite significant considering the total volume of gas to be processed. Based on a rough estimate, the BDU would lead to an increase of 26-52% in the electricity consumption and 1€/tonne of CO2 in operating cost, for a full scale CO2 capture plant.
Kyungmin Lim - One of the best experts on this subject based on the ideXlab platform.
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determination of n nitrosodiethanolamine ndela in cosmetic ingredients and products by mixed mode solid phase extraction and uplc tandem mass spectrometry with porous graphitic carbon column through systemic sample pre cleanup procedure
Talanta, 2015Co-Authors: Kyungmi Joo, Misook Shin, Jihee Jung, Boomin Kim, Johnwhan Lee, Hyejin Jeong, Kyungmin LimAbstract:A rapid, sensitive, accurate and specific ultra-performance liquid chromatography coupled to tandem mass spectrometry (UPLC-MS/MS) method for the detection of N-Nitrosodiethanolamine (NDELA), a highly toxic contaminant in cosmetic raw materials and products was developed and validated. Systematized sample preparation steps were developed according to product types. Various SPE cartridges and columns were examined to establish the condition of SPE and chromatographic separation for NDELA. Sample cleanup steps consisting of solvent and liquid-liquid extraction tailored to the various sample matrix types were established prior to mixed mode SPE (Bond Elut AccuCAT). Chromatographic separation was achieved within 7 min on a porous graphitic carbon (PGC) column using a gradient elution with the mobile phase of 1mM ammonium acetate containing 0.1% acetic acid and methanol. NDELA was monitored using an electrospray positive ionization mass spectrometry in the multiple reaction monitoring (MRM) mode (m/z 134.9>103.7(quantifier) and 73.7(qualifier ion)) with d8-NDELA (m/z 143.1>111.0) as internal standard. The standard curves were linear over the concentration range of 1-100 ng/mL with a correlation coefficient higher than 0.99. The limit of detection (LOD) and the limit of quantification (LOQ) was 10 and 20 μg/kg, respectively (0.5 and 1 ng/mL in standard solution). The intra- and inter-day precisions were estimated to be below 11.1% and accuracies were within the range of 90.8-115.8%. The validated method was successfully applied to the analysis of real samples including raw materials, skin care, make-up, shampoos and hair products.
Teng Zeng - One of the best experts on this subject based on the ideXlab platform.
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predicting n nitrosamines n nitrosodiethanolamine as a significant component of total n nitrosamines in recycled wastewater
Environmental Science and Technology Letters, 2015Co-Authors: Teng Zeng, William A MitchAbstract:N-Nitrosamines are key contaminants of concern for wastewater reuse. Although research has focused on N-nitrosodimethylamine (NDMA), measurements indicate that NDMA accounts for only ∼9% of total N-nitrosamines in wastewaters, similar to previous findings in drinking and recreational waters. Recognizing the limited time scale for biological transformation during wastewater treatment, we targeted N-Nitrosodiethanolamine (NDELA) as a component of total N-nitrosamines based upon the widespread usage of its triethanolamine precursor in consumer products. NDELA accounted for ∼6% of total N-nitrosamines, exceeding NDMA concentrations in some cases, and those of all other specific N-nitrosamines measured. While ozone and chloramines increased NDMA concentrations by up to an order of magnitude, and chloramines increased NDELA concentrations in some cases, other N-nitrosamine concentrations did not increase. Total N-nitrosamine concentrations increased by only 38–89% during ozonation and 23–65% during chloraminati...
