Andreas Widodo | Delft University of Technology (original) (raw)
Papers by Andreas Widodo
Heliyon
This work studied the oxidative degradation performance of manganese gluconate as a liquid redox ... more This work studied the oxidative degradation performance of manganese gluconate as a liquid redox sulfur recovery (LRSR) agent. The degradation of gluconate in an aerated sulfide containing 0.1 M manganese/0.8 M gluconate/pH 13 solution was 11% in 47 h and 20% in 100 h of reaction time. With the total price of chelates being more or less comparable, these were superior to the degradation resistance of EDTA chelate in a solution of 0.1 M iron/0.2 M EDTA/pH 8 which degraded by about 30% in 47 h, and NTA in Fe-NTA (0.1 M metal/0.2 M chelate/pH 6.5), which was degraded by 40% in 100 h of reaction time. At pH of 13, 0.1 M Metal, and 0.8 M gluconate, manganese degraded gluconate more severely than iron and copper. At a lower chelate to metal molar ratio (RCM) of 2 and as well as at a lower pH of 10, the manganese gluconate degradation, expressed as relative concentration to its initial concentration, was faster than at RCM of 8 and pH of 13. All of these observations can be explained among others by the well-known Fenton reaction hydroxyl radicals mechanism as the main cause of the degradation process.
![Research paper thumbnail of H2S–CO2Separation Using Room Temperature Ionic Liquid [BMIM][Br]](https://attachments.academia-assets.com/83615385/thumbnails/1.jpg)
](Separation Science and Technology, 2014
Chemical Engineering and Processing: Process Intensification, 2015
ABSTRACT Most of energy consumption in sweetening gas plants using amine sorbent is used to purif... more ABSTRACT Most of energy consumption in sweetening gas plants using amine sorbent is used to purify the solvent from acid gases. Moreover, energy-free regeneration process using immiscible chemical additive, such as using antisolvent agents, could be promising. In this research, regeneration of industrial amines from H2S and CO2 using antisolvent has been evaluated under ambient temperature and pressure. The analysis was done by measuring the mass balance of absorbed/desorbed CO2 and H2S after antisolvent addition. The result indicated that non-polar compound, such as hexane, could have a capability to undissolve both CO2 and H2S that have been dissolved in the amine solution. The released gas per antisolvent addition ratio could reach ca. 7% for H2S and 4% for CO2 in mol basis using hexane as antisolvent agent. H2S and CO2 removal increased in proportional with the total amount anti-solvent added to the solution.
Heliyon
Iron chelate liquid redox sulfur recovery (LRSR) has been one of the most frequently recommended ... more Iron chelate liquid redox sulfur recovery (LRSR) has been one of the most frequently recommended technologies for the oxidation of H 2 S in natural gas into elemental sulfur, particularly when the acid gas has a high CO 2 /H 2 S molar ratio. The process is however known to suffer from extensive oxidative ligand degradation that results in high operational costs. Moreover, poor biodegradability or toxicity of the existing ligand has become a concern. In this research, we demonstrated that gluconate, a naturally greener ligand, when coupled with manganese as the metal, has considerable potential to be a better redox agent. Manganese gluconate solution was more resistant against ligand degradation compared with iron NTA. As required, aerated solution was capable of converting dissolved NaHS into elemental sulfur. At sufficiently high pH, manganese gluconate solutions were stable enough from precipitation of manganese hydroxide, carbonate, or sulfides. An equilibrium calculation has been developed to understand the precipitation behavior.
Chemical Engineering and Processing: Process Intensification, 2015
ABSTRACT Most of energy consumption in sweetening gas plants using amine sorbent is used to purif... more ABSTRACT Most of energy consumption in sweetening gas plants using amine sorbent is used to purify the solvent from acid gases. Moreover, energy-free regeneration process using immiscible chemical additive, such as using antisolvent agents, could be promising. In this research, regeneration of industrial amines from H2S and CO2 using antisolvent has been evaluated under ambient temperature and pressure. The analysis was done by measuring the mass balance of absorbed/desorbed CO2 and H2S after antisolvent addition. The result indicated that non-polar compound, such as hexane, could have a capability to undissolve both CO2 and H2S that have been dissolved in the amine solution. The released gas per antisolvent addition ratio could reach ca. 7% for H2S and 4% for CO2 in mol basis using hexane as antisolvent agent. H2S and CO2 removal increased in proportional with the total amount anti-solvent added to the solution.
Heliyon
This work studied the oxidative degradation performance of manganese gluconate as a liquid redox ... more This work studied the oxidative degradation performance of manganese gluconate as a liquid redox sulfur recovery (LRSR) agent. The degradation of gluconate in an aerated sulfide containing 0.1 M manganese/0.8 M gluconate/pH 13 solution was 11% in 47 h and 20% in 100 h of reaction time. With the total price of chelates being more or less comparable, these were superior to the degradation resistance of EDTA chelate in a solution of 0.1 M iron/0.2 M EDTA/pH 8 which degraded by about 30% in 47 h, and NTA in Fe-NTA (0.1 M metal/0.2 M chelate/pH 6.5), which was degraded by 40% in 100 h of reaction time. At pH of 13, 0.1 M Metal, and 0.8 M gluconate, manganese degraded gluconate more severely than iron and copper. At a lower chelate to metal molar ratio (RCM) of 2 and as well as at a lower pH of 10, the manganese gluconate degradation, expressed as relative concentration to its initial concentration, was faster than at RCM of 8 and pH of 13. All of these observations can be explained among others by the well-known Fenton reaction hydroxyl radicals mechanism as the main cause of the degradation process.
Separation Science and Technology, 2014
Chemical Engineering and Processing: Process Intensification, 2015
ABSTRACT Most of energy consumption in sweetening gas plants using amine sorbent is used to purif... more ABSTRACT Most of energy consumption in sweetening gas plants using amine sorbent is used to purify the solvent from acid gases. Moreover, energy-free regeneration process using immiscible chemical additive, such as using antisolvent agents, could be promising. In this research, regeneration of industrial amines from H2S and CO2 using antisolvent has been evaluated under ambient temperature and pressure. The analysis was done by measuring the mass balance of absorbed/desorbed CO2 and H2S after antisolvent addition. The result indicated that non-polar compound, such as hexane, could have a capability to undissolve both CO2 and H2S that have been dissolved in the amine solution. The released gas per antisolvent addition ratio could reach ca. 7% for H2S and 4% for CO2 in mol basis using hexane as antisolvent agent. H2S and CO2 removal increased in proportional with the total amount anti-solvent added to the solution.
Heliyon
Iron chelate liquid redox sulfur recovery (LRSR) has been one of the most frequently recommended ... more Iron chelate liquid redox sulfur recovery (LRSR) has been one of the most frequently recommended technologies for the oxidation of H 2 S in natural gas into elemental sulfur, particularly when the acid gas has a high CO 2 /H 2 S molar ratio. The process is however known to suffer from extensive oxidative ligand degradation that results in high operational costs. Moreover, poor biodegradability or toxicity of the existing ligand has become a concern. In this research, we demonstrated that gluconate, a naturally greener ligand, when coupled with manganese as the metal, has considerable potential to be a better redox agent. Manganese gluconate solution was more resistant against ligand degradation compared with iron NTA. As required, aerated solution was capable of converting dissolved NaHS into elemental sulfur. At sufficiently high pH, manganese gluconate solutions were stable enough from precipitation of manganese hydroxide, carbonate, or sulfides. An equilibrium calculation has been developed to understand the precipitation behavior.
Chemical Engineering and Processing: Process Intensification, 2015
ABSTRACT Most of energy consumption in sweetening gas plants using amine sorbent is used to purif... more ABSTRACT Most of energy consumption in sweetening gas plants using amine sorbent is used to purify the solvent from acid gases. Moreover, energy-free regeneration process using immiscible chemical additive, such as using antisolvent agents, could be promising. In this research, regeneration of industrial amines from H2S and CO2 using antisolvent has been evaluated under ambient temperature and pressure. The analysis was done by measuring the mass balance of absorbed/desorbed CO2 and H2S after antisolvent addition. The result indicated that non-polar compound, such as hexane, could have a capability to undissolve both CO2 and H2S that have been dissolved in the amine solution. The released gas per antisolvent addition ratio could reach ca. 7% for H2S and 4% for CO2 in mol basis using hexane as antisolvent agent. H2S and CO2 removal increased in proportional with the total amount anti-solvent added to the solution.