SYNTHESIS OF HYDROGEN GAS THROUGH LOW-TEMPERATURE WATER-GAS SHIFT REACTION (WGSR): SIMULATION OF EQUILIBRIUM REACTION
Global hydrogen demand continues to increase every year. In 2018, global hydrogen consumption reached 60 million tons. Most of the world’s hydrogen needs are met through the steam reforming of natural gas. Reformed gas contains 1-10% CO, this CO content can poison the catalyst in ammonia producti...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/55386 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Global hydrogen demand continues to increase every year. In 2018, global hydrogen
consumption reached 60 million tons. Most of the world’s hydrogen needs are met
through the steam reforming of natural gas. Reformed gas contains 1-10% CO, this CO
content can poison the catalyst in ammonia production. Water-gas shift reaction has been
used for a long time and widely in industry to reduce CO levels in hydrogen gas, and is
an important step in ammonia industry, methanol industry, and hydrogen production.
Therefore, equilibrium analysis is required to determine the optimum conditions to
achieve a higher equilibrium conversion of CO.
The purpose of this research is to determine the optimum temperature of the water-gas
shift reaction which provides the highest CO conversion and to determine the space-time
in the WGS reactor to achieve certain CO conversion. The equilibrium analysis was
performed by simulation using Aspen HYSYS v10. The operating conditions used in the
simulation are industrial operating conditions, at a temperature of 200-250°C and a
pressure of 38 bar. Then, to determine the space-time, reactor volume data is required.
The volume of the reactor is determined by utilizing a conversion-temperature-reaction
rate curve and by deriving the energy balance so that the operating line is generated in the
form of conversion as a function of temperature. The kinetic rate equation used to
construct the conversion-temperature-rate curve is obtained from Choi and Stenger
(2003). Reactor volume is calculated using catalyst mass, catalyst density, and porosity.
Analysis of the conversion-temperature-reaction rate curves shows the maximum CO
conversion that can be achieved is 97%. Conversion is achieved at an H2O/CO ratio on
the feed of 22 and a feed temperature of 200oC. The required space-time is 4,618 s and
the reactor output temperature is 222oC.
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