- Process Plants
- Air separation plants
- LNG and natural gas processing plants
- Petrochemical plants
- Cryogenic plants
- CCS and CO₂ plants
Drawing on our world-class experience across the entire natural gas processing chain, we can offer basic and detailed engineering as well as turnkey plant construction for natural gas liquid (NGL) and liquefied petroleum gas (LPG) recovery plants. Due to their added value, heavier hydrocarbons (NGL/C2+ and LPG/C3+) are often extracted from natural gas. Cryogenic processes are often the most economical way to separate these fractions.
NGL consists of ethane and heavier hydrocarbons (C2+). It is an ideal feedstock for steam crackers producing olefins. As this feedstock has a higher sales value than natural gas itself, the costs for extraction may be justified.
As a first step, the natural gas has to be dehydrated and then treated in an efficient cryogenic process involving gas cooling, work expansion and finally C2+ separation. After extraction of the heavier hydrocarbons, the lean gas is warmed up to ambient temperature against feed gas and is recompressed to the required pipeline pressure using the mechanical energy of the expansion process as well as external power supplied by the electrical grid, a gas turbine or a steam turbine.
The resulting liquid C2+ stream can be fractionated into ethane, propane, butane and gasoline. The liquid products are stored either in cryogenic flat-bottom tanks, in pressurised bullet tanks or spherical tanks to be loaded onto ships and/or road tankers.
LPG consists mainly of propane (C3) and butane (C4) and is widely used as an alternative automotive fuel or as chemical feedstock.
For the recovery of LPG, we offer an advanced expander process using cryogenic absorption and a deethaniser column, which allows for recovery rates as high as 99.9 %, while minimising energy consumption. The expander process enables higher CO2 content in the feed gas than conventional expander processes.
LPG can be fractionated, stored in tanks and loaded for export in the same manner as NGL.