Utilization of sulfur dioxide in organic acids recovery and sulfur
... regenerable sorbents of mixed-metal oxides that efficiently remove H2S and carbonyl sulfide have been developed. A test with ZnO-doped manganese oxide sorbent as regenerable sorbent also showed its high efficiency in removing H2S [13]. Using a copper based absorbent, a H2S concentration of less than ...
... regenerable sorbents of mixed-metal oxides that efficiently remove H2S and carbonyl sulfide have been developed. A test with ZnO-doped manganese oxide sorbent as regenerable sorbent also showed its high efficiency in removing H2S [13]. Using a copper based absorbent, a H2S concentration of less than ...
Model-based approach to plant-wide economic control of uid
... chemical processes, such as the FCCU can be brought into the realm of possibility. The proposed nonlinear control scheme was applied to the control of the highly nonlinear FCC process. Simulations showed that the non-linear model-based MPC is highly effective, and coped well with the complexity and ...
... chemical processes, such as the FCCU can be brought into the realm of possibility. The proposed nonlinear control scheme was applied to the control of the highly nonlinear FCC process. Simulations showed that the non-linear model-based MPC is highly effective, and coped well with the complexity and ...
Small Phenolic Compounds Production from Kraft Black
... Delignification in the Kraft cooking proceeds in three distinct phases: the initial phase, the bulk phase, and the final or residual phase. The initial phase of delignification takes place at a temperature of about 150 ºC, and it is controlled by diffusion. The bulk phase includes the heating period ...
... Delignification in the Kraft cooking proceeds in three distinct phases: the initial phase, the bulk phase, and the final or residual phase. The initial phase of delignification takes place at a temperature of about 150 ºC, and it is controlled by diffusion. The bulk phase includes the heating period ...
Effects of pretreatments of Napier Grass with deionized water
... acid). Acetic acids are released from the acetyl groups in the hemicellulosic fraction while formic acid and livulinic acids are generated from degradation of furfural. [23]. Torrefaction, on the other hand, is a mild pyrolysis process usually carried out in an inert environment at a temperature bet ...
... acid). Acetic acids are released from the acetyl groups in the hemicellulosic fraction while formic acid and livulinic acids are generated from degradation of furfural. [23]. Torrefaction, on the other hand, is a mild pyrolysis process usually carried out in an inert environment at a temperature bet ...
Helium Extraction from LNG End-Flash
... condenser, the feed stream of the HeXU has a smaller fraction of methane than the other processes, reducing its boiling temperature. This needs a lower condensing temperature in the HeXU to concentrate helium to 50 mol% in the crude helium. However, the HeXU cannot realise such low condensing temper ...
... condenser, the feed stream of the HeXU has a smaller fraction of methane than the other processes, reducing its boiling temperature. This needs a lower condensing temperature in the HeXU to concentrate helium to 50 mol% in the crude helium. However, the HeXU cannot realise such low condensing temper ...
Nickel catalyst auto-reduction during steam reforming of bio
... knowledge, little research has been done on the reduction of metal oxides by oxygenated hydrocarbons, although reduction with simple molecules such as H2 [17-19], CH4 [20-22] and CO [23] have been studied in the fields of metallurgy, catalysis and chemical looping technology. Chemical looping reform ...
... knowledge, little research has been done on the reduction of metal oxides by oxygenated hydrocarbons, although reduction with simple molecules such as H2 [17-19], CH4 [20-22] and CO [23] have been studied in the fields of metallurgy, catalysis and chemical looping technology. Chemical looping reform ...
Full circle: Years in Industry informs Al Weimer`s work in fuels
... temperature required to split water to make hydrogen from about 1,600 degrees Celsius to about 1,000 degrees, low enough that standard materials no longer melt into glowing puddles on the floor. For an encore, they focused sunlight on grass clippings and fallen leaves – known more formally as source ...
... temperature required to split water to make hydrogen from about 1,600 degrees Celsius to about 1,000 degrees, low enough that standard materials no longer melt into glowing puddles on the floor. For an encore, they focused sunlight on grass clippings and fallen leaves – known more formally as source ...
The Exploratory Study on Sulfide Removal Ability of Sulfur-
... The resulting biogas contains 55-70 % CH4, 30-45 CO2, and 0-1.5 % H2S. Hydrogen sulfide is present in biogas produced from the degradation of proteins and other sulfur containing compounds present in the organic feed stock to the digester. The concentration of hydrogen sulfide in the biogas depends ...
... The resulting biogas contains 55-70 % CH4, 30-45 CO2, and 0-1.5 % H2S. Hydrogen sulfide is present in biogas produced from the degradation of proteins and other sulfur containing compounds present in the organic feed stock to the digester. The concentration of hydrogen sulfide in the biogas depends ...
Degradation kinetics of Diclofenac in Water by Fenton`s Oxidation
... removal are very slow and not appreciable after 240 minutes of reaction time. Hence, further experiments are carried out for a reaction time of 240 minutes. The variations in percent DCF reduction and percent COD removals at optimum conditions for 240 minutes of reaction time are shown in Figure 2. ...
... removal are very slow and not appreciable after 240 minutes of reaction time. Hence, further experiments are carried out for a reaction time of 240 minutes. The variations in percent DCF reduction and percent COD removals at optimum conditions for 240 minutes of reaction time are shown in Figure 2. ...
Study on Oxidation Effect of Ozone on Petroleum
... can not be removed, together with 25 newly increased organics in the ozone-oxidized water. The removed organics mainly include alkanes, olefins, esters, ethers and etc. The newly increased organics mainly include acids, amines and aldehydes. It indicates that most organics in petroleum can be oxidiz ...
... can not be removed, together with 25 newly increased organics in the ozone-oxidized water. The removed organics mainly include alkanes, olefins, esters, ethers and etc. The newly increased organics mainly include acids, amines and aldehydes. It indicates that most organics in petroleum can be oxidiz ...
SACHE Problem Set Volume 2 - Safety and Chemical Engineering
... acetaldehyde are of the "aldehyde" family. ...
... acetaldehyde are of the "aldehyde" family. ...
Assess the Denitrification Performance of Fermented and Dark
... Abstract: The study has assessed the denitrification performance of fermented and dark-fermented biosolids as external carbon sources using lab-scaled Sequencing Batch Reactors (SBRs). This was done by adding fermented and dark-fermented biosolids into anoxic zones of two SBRs, and then assessing th ...
... Abstract: The study has assessed the denitrification performance of fermented and dark-fermented biosolids as external carbon sources using lab-scaled Sequencing Batch Reactors (SBRs). This was done by adding fermented and dark-fermented biosolids into anoxic zones of two SBRs, and then assessing th ...
Reductive decomposition of calcium sulfate with carbon monoxide
... reducing gases in a fluidized bed reactor a t high temperature to produce sulfur dioxide and lime (Wheelock and Morris, 1986; Morris et al., 1987; Kuehle and Knoesel, 1988; Gruncharov et al., 1988). In spite of extensive process development, the chemical reaction mechanism for calcium sulfate decomp ...
... reducing gases in a fluidized bed reactor a t high temperature to produce sulfur dioxide and lime (Wheelock and Morris, 1986; Morris et al., 1987; Kuehle and Knoesel, 1988; Gruncharov et al., 1988). In spite of extensive process development, the chemical reaction mechanism for calcium sulfate decomp ...
Ethylene Glycol
... water after evaporation. The dehydrated solution is then fed into a series of distillation columns to separate the various glycols [5]. Modeling a process such as the production of ethylene oxide and ethylene glycol can save time and money for the companies beginning the process of construction of ...
... water after evaporation. The dehydrated solution is then fed into a series of distillation columns to separate the various glycols [5]. Modeling a process such as the production of ethylene oxide and ethylene glycol can save time and money for the companies beginning the process of construction of ...
A novel process of dye wastewater treatment by linking advanced
... coupled with biological oxidation for the treatment of non-biodegradation industrial wastewater has been demonstrated in the literature (Lodha and Chaudhari 2007, Oller et al. 2011, Papic et al. 2006). In the Fenton’s oxidation followed by biological oxidation process, non-biodegradable organic comp ...
... coupled with biological oxidation for the treatment of non-biodegradation industrial wastewater has been demonstrated in the literature (Lodha and Chaudhari 2007, Oller et al. 2011, Papic et al. 2006). In the Fenton’s oxidation followed by biological oxidation process, non-biodegradable organic comp ...
CONVERSION OF NITROGEN OXIDES AND AROMATIC VOLATILE
... Study regarding the behaviour of nitrogen oxides in selective reduction reaction, in the presence of ammonia, on SCR-DeNOx (0.53 % wt. V2O5) commercial catalyst resulted in conclusions that the value of NOx conversion depends on the ratio NH3/NOx and is not significantly influenced by variation of t ...
... Study regarding the behaviour of nitrogen oxides in selective reduction reaction, in the presence of ammonia, on SCR-DeNOx (0.53 % wt. V2O5) commercial catalyst resulted in conclusions that the value of NOx conversion depends on the ratio NH3/NOx and is not significantly influenced by variation of t ...
reaction kinetics and mechanistic studies of nitric oxide
... conversion at different temperature; -♦- persulfate only, -▲- persulfate with Fe2+, -*persulfate with both Fe2+ and EDTA In Figure 2, NO absorption for combined persulfate and FeII-EDTA system is compared with Fe2+ activated system and persulfate-only system [1, 3]. Figure (a) shows the comparative ...
... conversion at different temperature; -♦- persulfate only, -▲- persulfate with Fe2+, -*persulfate with both Fe2+ and EDTA In Figure 2, NO absorption for combined persulfate and FeII-EDTA system is compared with Fe2+ activated system and persulfate-only system [1, 3]. Figure (a) shows the comparative ...
this PDF file - University of Pannonia
... feedstock is released as crude glycerol. This product fraction comprises several impurities, e.g. residues of vegetable oil and esters, salts, different alkaline catalysts and water. However, the process is far from being environmentally friendly as the final mixture needs to be separated, neutralis ...
... feedstock is released as crude glycerol. This product fraction comprises several impurities, e.g. residues of vegetable oil and esters, salts, different alkaline catalysts and water. However, the process is far from being environmentally friendly as the final mixture needs to be separated, neutralis ...
Chemical Engineering Report Series
... less recycle streams, reduced need for waste handling, and lower investment and operating costs compared to conventional processes. One way of doing this is to perform two or more process steps simultaneously and not one after another as it is traditionally done. An example of this is reactive disti ...
... less recycle streams, reduced need for waste handling, and lower investment and operating costs compared to conventional processes. One way of doing this is to perform two or more process steps simultaneously and not one after another as it is traditionally done. An example of this is reactive disti ...
Biological conversion of sulfide to elemental sulfur
... nontoxic and is used as a feedstock for the chemical, fertilizer and materials manufacturing industries'. Conventional chemical processes for sulfur recovery from sour water and gas are expensive because .of the need to replace poisoned catalysts, contaminated reactor liquids and corroded reaction ...
... nontoxic and is used as a feedstock for the chemical, fertilizer and materials manufacturing industries'. Conventional chemical processes for sulfur recovery from sour water and gas are expensive because .of the need to replace poisoned catalysts, contaminated reactor liquids and corroded reaction ...
Hydrogen Sulfide in Drinking Water - Causes
... with water and the plumbing system. Chlorine, if used in sufficient concentration and with adequate contact time, is an excellent disinfectant that kills most disease-causing bacteria, viruses and cysts of protozoans. It also kills nonpathogenic iron, manganese and sulfur bacteria. In some cases, ir ...
... with water and the plumbing system. Chlorine, if used in sufficient concentration and with adequate contact time, is an excellent disinfectant that kills most disease-causing bacteria, viruses and cysts of protozoans. It also kills nonpathogenic iron, manganese and sulfur bacteria. In some cases, ir ...
NH4 ratio and the nitrogen loading rate on the stability of ANAMMOX
... The potential inhibitory effect of nitrite on anammox bacteria remains one of the difficulties in the application of the anammox process. Neither the mechanism by which it occurs nor the conditions under which nitrite affects the performance of continuous bioreactors, have been elucidated. The perfo ...
... The potential inhibitory effect of nitrite on anammox bacteria remains one of the difficulties in the application of the anammox process. Neither the mechanism by which it occurs nor the conditions under which nitrite affects the performance of continuous bioreactors, have been elucidated. The perfo ...
Synthesis gas purification.
... (element, speciation), as well as their relative contents. Moreover, due to high FT catalyst sensitivity, severe syngas specifications regarding its purity are required. For these reasons, synthesis gas purification constitutes a major challenge for the development of B-XTL processes. In this articl ...
... (element, speciation), as well as their relative contents. Moreover, due to high FT catalyst sensitivity, severe syngas specifications regarding its purity are required. For these reasons, synthesis gas purification constitutes a major challenge for the development of B-XTL processes. In this articl ...
IFS_Question_Paper_Chemical_engineering
... Note : density of water at 20° C = 0.998 g/cc. 2. (a) The liquid phase reaction, (where K1=8 liter/mol.min K2=3 liter/mol.min) is carried out in 150 litre stirred tank reactor under steady state conditions. Reactants A and B are fed to the reactor at equal volumetric flow rates. The concentrations o ...
... Note : density of water at 20° C = 0.998 g/cc. 2. (a) The liquid phase reaction, (where K1=8 liter/mol.min K2=3 liter/mol.min) is carried out in 150 litre stirred tank reactor under steady state conditions. Reactants A and B are fed to the reactor at equal volumetric flow rates. The concentrations o ...
Flash reactor
As an extension of the fluidized bed family of separation processes, the flash reactor (FR) (or transport reactor) employs turbulent fluid introduced at high velocities to encourage chemical reactions with feeds and subsequently achieve separation through the chemical conversion of desired substances to different phases and streams. A flash reactor consists of a main reaction chamber and an outlet for separated products to enter downstream processes.FR vessels facilitate a low gas and solid retention (and hence reactant contact time) for industrial applications which give rise to a high throughput, pure product and less than ideal thermal distribution when compared to other fluidized bed reactors. Due to these properties as well as its relative simplicity FRs have the potential for use for pre-treatment and post-treatment processes where these strengths of the FR are prioritized the most.Various designs of a FR (e.g. pipeline FR, centrifugal FR, vessel FR) exist and are currently used in pilot industrial plants for further development. These designs allow for a wide range of current and future applications, including water treatment sterilization, recovery and recycling of steel mill dust, pre-treatment and roasting of metals, chemical looping combustion as well as hydrogen production from biomass.