Gas Processing
Gas plants supplied by Linde utilize a series of very different processes, which greatly benefit from process-technological know-how and experience in the manufacture of equipment components. Gas plants serve to purify and separate gas mixtures and are based on such process steps as cryogenic separation, physical or chemical washes, adsorption or a chemical reaction. Units like these are ordered by EPC contractors to serve as components of larger projects or are installed by final customers themselves to amplify existing plants.
Gas Plant Complex in Singapore
H2/CO separation is applied in CO plants for product purification.
Carbon monoxide is condensed out of synthesis gas in an insulated compact module (cold box) at low temperatures and, if necessary, washed out with liquid methane and then purified by low-temperature rectification.
H2/Hydrocarbon monoxide separation is used in methyl tertiary butyl ether (MTBE) plants, propane dehydrogenation (PDH) or hydrogen dealkylation (HDA) or plants.
The hydrocarbon impurities in the hydrogen are condensed out in an insulated compact module (cold box) at low temperatures.
Pressure swing adsorption (PSA) is applied to purify hydrogen derived from synthesis gas.
Impurities as CO2, N2, CO, CH4 and H2O are alternately adsorbed from the hydrogen stream in parallel-working adsorber vessels at process pressure on solids and then desorbed at low pressure.
A number of processes serve to remove and recover sulfur components and carbon dioxide.
Sour gases (H2S, CO2 and COS) are removed by a variety of chemical and physical washing processes (MDEA, MEA, Benfield) from gas mixtures. Sulfur can be recovered by the catalytic CLINSULF® process.
The RECTISOL® wash is applied for the selective removal of hydrosulfide/carbonyl sulfide and carbon dioxide from gas mixtures.
RECTISOL® is a physical sour gas wash, which uses an organic solvent (typically methanol) at low temperatures, for example to purify synthesis gas.
The liquid nitrogen wash is applied to purify and adjust the hydrogen-nitrogen mixture for ammonia synthesis.
Such impurities in the hydrogen as methane, CO or argon are washed out by liquid nitrogen in an insulated compact module (cold box) at low temperatures, and in a parallel process, the H2/N2 mixture ratio of 3:1 is adjusted for the ammonia synthesis.
