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Purification of Hydrogen-Methane Mixtures Using PSA Technology

  • Rosaria Augelletti
  • Sara Frattari
  • Maria Anna Murmura
Chapter
Part of the Green Energy and Technology book series (GREEN)

Abstract

Mixtures of hydrogen-methane (hydromethane), composed of 20–30 %vol. hydrogen, are considerably interesting, especially in the field of sustainable mobility, because their energy content is higher than that of pure methane; moreover, the carbon dioxide emissions due to the combustion are reduced. The production of such mixture can be effectively carried out by means of steam reforming of natural gas (97 % methane and 3 % carbon dioxide) at 500–550 °C. However, the reformed gas must be purified in order to reduce the carbon dioxide concentration (lower than 3 %). The pressure swing adsorption technology, which uses activated carbon as adsorbent material, may be employed to remove carbon dioxide and to obtain a high recovery of hydrogen and methane. To improve the recovery of methane, a second pressure swing adsorption unit, which uses carbon molecular sieve as an adsorbent, can be introduced.

Keywords

Hydrogen-methane mixture separation Pressure swing adsorption Activated carbon Carbon dioxide removal 

List of symbols

A

Skarstrom PSA cycle

B

Modified Skarstrom PSA cycle

b

Temperature-dependent Langmuir isotherm parameter

k

Mass transport coefficient

p

Partial pressure

P

Total pressure

q

Amount absorbed on absorbent material

qmax

Maximum absorbable amount

S

Selectivity

T

Temperature

Subscripts and superscripts

i, J

component

kin

Kinetic

LDF

Linear driving force

thermo

Thermodynamic

Acronyms and abbreviations

BD

Blow-down step

CHP

Cogeneration system

CMS

Carbon molecular sieve

EQ

Equalization step

FE

Feed step

MOF

Metal organic framework

PR

Pressurization step

PSA

Pressure swing adsorption

PU

Purge step

RPSA

Rapid pressure swing adsorption

SAPO

Silico aluminate phosphate

VPSA

Vacuum pressure swing adsorption

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Rosaria Augelletti
    • 1
  • Sara Frattari
    • 1
  • Maria Anna Murmura
    • 1
  1. 1.Department of Chemical Engineering Materials EnvironmentSapienza University of RomeRomeItaly

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