Novel single stripper with side-draw to Remove Ammonia and sour gas simultaneously for coal-gasification wastewater treatment and the industrial implementation / Dachun Feng in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5816–5823 Titre : Novel single stripper with side-draw to Remove Ammonia and sour gas simultaneously for coal-gasification wastewater treatment and the industrial implementation Type de document : texte imprimé Auteurs : Dachun Feng, Auteur ; Zhenjiang Yu, Auteur ; Yun Chen, Auteur Année de publication : 2009 Article en page(s) : pp. 5816–5823 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Wastewater Coal-gasification process Carbon dioxide Ammonia Résumé : A large amount of wastewater is produced in the Lurgi coal-gasification process with the complex compounds carbon dioxide, ammonia, phenol, etc., which cause a serious environmental problem. Most of the known pretreatment techniques do not yield sufficient performance for phenol removal, which hampers the functions of the subsequent biochemical treatment process. In this paper, a novel stripper operated at elevated pressure is designed to improve the pretreatment process. In this technology, two noticeable improvements were established. First, the carbon dioxide and ammonia were removed simultaneously in a single striper where sour gas (mainly carbon dioxide) is removed from the tower top and the ammonia vapor is drawn from the side and recovered by partial condensation. Second, the ammonia is removed before the phenol recovery to reduce the pH value of the subsequent extraction units, so as the phenol removal performance of the extraction is greatly improved. To ensure the operational efficiency, some key operational parameters are analyzed and optimized though simulation. It is shown that when the top temperature is kept at 40 °C and the weight ratio of the side draw to the feed is above 9%, the elevated pressures can ensure the removal efficiency of NH3 and carbon dioxide and the desired purified water as the bottom product of the unit is obtained. A real industrial application demonstrates the attractiveness of the new technique: it removes 99.9% CO2 and 99.6% ammonia, compared to known techniques which remove 66.5% and 94.4%, respectively. As a result, the pH value of the wastewater is reduced from above 9 to below 7. This ensures that the phenol removal ratio is above 93% in the following extraction units. The operating cost is lower than that of known techniques, and the operation is simplified. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9002987 [article] Novel single stripper with side-draw to Remove Ammonia and sour gas simultaneously for coal-gasification wastewater treatment and the industrial implementation [texte imprimé] / Dachun Feng, Auteur ; Zhenjiang Yu, Auteur ; Yun Chen, Auteur . - 2009 . - pp. 5816–5823. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5816–5823 Mots-clés : Wastewater Coal-gasification process Carbon dioxide Ammonia Résumé : A large amount of wastewater is produced in the Lurgi coal-gasification process with the complex compounds carbon dioxide, ammonia, phenol, etc., which cause a serious environmental problem. Most of the known pretreatment techniques do not yield sufficient performance for phenol removal, which hampers the functions of the subsequent biochemical treatment process. In this paper, a novel stripper operated at elevated pressure is designed to improve the pretreatment process. In this technology, two noticeable improvements were established. First, the carbon dioxide and ammonia were removed simultaneously in a single striper where sour gas (mainly carbon dioxide) is removed from the tower top and the ammonia vapor is drawn from the side and recovered by partial condensation. Second, the ammonia is removed before the phenol recovery to reduce the pH value of the subsequent extraction units, so as the phenol removal performance of the extraction is greatly improved. To ensure the operational efficiency, some key operational parameters are analyzed and optimized though simulation. It is shown that when the top temperature is kept at 40 °C and the weight ratio of the side draw to the feed is above 9%, the elevated pressures can ensure the removal efficiency of NH3 and carbon dioxide and the desired purified water as the bottom product of the unit is obtained. A real industrial application demonstrates the attractiveness of the new technique: it removes 99.9% CO2 and 99.6% ammonia, compared to known techniques which remove 66.5% and 94.4%, respectively. As a result, the pH value of the wastewater is reduced from above 9 to below 7. This ensures that the phenol removal ratio is above 93% in the following extraction units. The operating cost is lower than that of known techniques, and the operation is simplified. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9002987

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Process development, simulation, and industrial implementation of a new coal-gasification wastewater treatment installation for phenol and ammonia removal / Zhenjiang Yu in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2874–2881 Titre : Process development, simulation, and industrial implementation of a new coal-gasification wastewater treatment installation for phenol and ammonia removal Type de document : texte imprimé Auteurs : Zhenjiang Yu, Auteur ; Yun Chen, Auteur ; Dachun Feng, Auteur Année de publication : 2010 Article en page(s) : pp. 2874–2881 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Simulation-- Industrial--Coal-Gasification--Wastewater--Treatment--Installation--Phenol--Ammonia Résumé : Coal-gasification wastewater poses serious problems in the Lurgi process. It cannot be easily purified, as the high pH value of the wastewater limits the dephenolization efficiency of extraction. This work proposes a new process to remove ammonia and sour gas in order to reduce the pH value of the wastewater from 9 to below 7, and next to remove phenol with solvent extraction under acidic conditions. This new process consists of a wastewater stripper with side-draw to remove ammonia and sour gas, an extractor to remove phenol, and two distillation columns to recover extractant. Process simulation was conducted to study the performance of the new process and to perform a detailed design. The complex multicomponent system NH3−CO2−H2S−NaOH−phenol−H2O was analyzed when simulating the wastewater stripping. The new process has been successfully implemented in an industrial installation for coal-gasification wastewater treatment with a capacity of 2000 tons/day. Satisfactory agreement was obtained between the simulation results and the industrial implementation of the new process. The new process, when compared with the old one, recovers phenols more efficiently and produces a wastewater stream acceptable for later biological treatment. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901958j [article] Process development, simulation, and industrial implementation of a new coal-gasification wastewater treatment installation for phenol and ammonia removal [texte imprimé] / Zhenjiang Yu, Auteur ; Yun Chen, Auteur ; Dachun Feng, Auteur . - 2010 . - pp. 2874–2881. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2874–2881 Mots-clés : Simulation-- Industrial--Coal-Gasification--Wastewater--Treatment--Installation--Phenol--Ammonia Résumé : Coal-gasification wastewater poses serious problems in the Lurgi process. It cannot be easily purified, as the high pH value of the wastewater limits the dephenolization efficiency of extraction. This work proposes a new process to remove ammonia and sour gas in order to reduce the pH value of the wastewater from 9 to below 7, and next to remove phenol with solvent extraction under acidic conditions. This new process consists of a wastewater stripper with side-draw to remove ammonia and sour gas, an extractor to remove phenol, and two distillation columns to recover extractant. Process simulation was conducted to study the performance of the new process and to perform a detailed design. The complex multicomponent system NH3−CO2−H2S−NaOH−phenol−H2O was analyzed when simulating the wastewater stripping. The new process has been successfully implemented in an industrial installation for coal-gasification wastewater treatment with a capacity of 2000 tons/day. Satisfactory agreement was obtained between the simulation results and the industrial implementation of the new process. The new process, when compared with the old one, recovers phenols more efficiently and produces a wastewater stream acceptable for later biological treatment. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901958j

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