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The main unit processes used for the production of hydrogen from natural gas are stream 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 

  1. SR; LT WGS; HT WGS; PSA
  2. PSA; SR; LT WGS; HT WGS
  3. SR; HT WGS; LT WGS; PSA
  4. PSA; HT WGS; LT WGS, SR
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