Extraction of hydrogen
Hydrogen is the significant component for numerous processes like:
-ammonia synthesis;
-methanolsynthesis;
-caprolactam production;
- hydrogenation.
Hydrogeniscriticalinsemiconductor manufacturing, petrochemistry, nonferrous metallurgy.Hydrogenconsumptionasfuelhasbeenwidelyincreased.
We propose technological solutions for extraction of hydrogen of any purity and in nearly unlimited amounts as described below:
1. Hydrogen extraction from natural gas
Hydrogen is extracted by means of steam conversion
CH4 + H2O = CO + 3H2 – catalytic reformingin tube furnace
ÑÎ + H2O = CO2 + H2 – catalyticsteamconversion
Syngas producedis purified fromCO2 using activated methyl di ethanol amine solution in the amine unit.
1 — coolingblock, 2 — airblower, 3 — foamabsorber, 4 — pump, 5 — heatexchanger,
6 — foamdesorber, 7 — desorbergenerator, I — gas to be cleaned, II — water, III — purified gas, IV — carbon dioxide to consumer, V — steam.
Hydrogenis extracted fromCO2-freesyngasinthe swingadsorptionunit.
2. Hydrogen extraction from hydrogen containing gas, like:
- cokegas(seep. coke gas)
Cokegasconsistsof 56-58% vol. hydrogenandisultimate raw material for hydrogen extraction.
- purge gas (for example, ammonia production)
Ammonia production purge gas contains about 60% of hydrogen, 5-7% of argon, nitrogen, methane.
Proposedhydrogenextractiontechnologiesofpressure swingadsorptionor cryogenic gas separation allow for extraction of hydrogen, which can be reused in production, and nitrogen and methane of 99% purity at the same time.
3. Hydrogen extraction in ammonia and methanol cracking plants
Numerousproductionsrequirelowamountsofpurehydrogen (for welding and steel cutting, semiconductors production), or at start-up period (at ammonia, methanol unit start,at heating of nitric acid contacting apparatus grids).
Thereasonablesolutionforsuchkindsofproductionis ammonia or methanol cracking plant.
Ammoniavapor degradesonthecatalystandproducedwatercontainingmixtureisused or hydrogen is extracted thereof