Natural gas processing equipment encompasses numerous unique processes. Natural gas liquids recovery (NGL) involves refrigerated gas plants, turboexpanders, debutanizers, depropanizers, and JT plants. The reason for an LPG plant could be hydrocarbon dew point control, natural gas liquids recovery, LPG production, propane recovery and butane recovery. The heating value (HHV) and LHV) of gas is important for downstream combustion stability. Stabilized LPG is used worldwide for heating and transportation. NGL can be separated using debutanizers and depropanizers into propane, butane, naphtha, etc. Refrigerated gas plants recover a large fraction of propane and heavier gases. Turboexpanders recover a large fraction of ethane and heavier gases. JT plants are simpler in design and use high-pressure gas energy to liquefy heavier components by throttling. The Joules-Thompson effect is a physical principle that changes the gas entropy through pressure reduction and produces chilling.
The Sep-Pro processes use either refrigeration, direct expansion JT effect or turboexpanders. Debutanizers and depropanizers will be necessary to separate NGL and LPG into propane, butane and naphtha. Sep-Pro dew point control will use the J-T effect or a refrigerated gas plant or can use waste heat drive from engine exhaust to drive an ammonia absorption refrigeration gas plant. Natural gas processing plants consist of cross heat exchanger, three phase separators, propane refrigeration, stabilizers, depropanizers, debutanizers, turboexpanders, glycol dehydration, etc. LPG plant liquids are usually more valuable than the gas fraction from which they are produced. Dew point control plants also produce NGL and LPG but their main purpose is to eliminate hydrocarbon condensation in pipelines and downstream process units.