Project ForgeChemical Technology
Inorganic Chemical Industries
GATE 2012
Medium
The main unit processes used for the production of hydrogen from natural gas are steam reforming (SR), pressure swing adsorption (PSA), low temperature water gas shift reaction (LT WGS) and high temperature water gas shift reaction (HT WGS). The correct sequence of these in the plant is
- ASR; LT WGS; HT WGS; PSA
- BPSA; SR; LT WGS; HT WGS
- SR; HT WGS; LT WGS; PSA
- DPSA; HT WGS; LT WGS; SR
Explanation
Natural gas is first steam reformed (SR) to syngas (CO+H2), then passed through the high-temperature shift (HT WGS) for bulk CO conversion, then the low-temperature shift (LT WGS) for finer CO cleanup, and finally purified by pressure swing adsorption (PSA) to recover high-purity H2.
Source: GATE CH 2012 (2012)
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