Method and system for producing a liquefied natural gas product

A system for producing a liquefied natural gas (LNG) product comprising:

• means to provide a feed natural gas (NG) containing methane and at least ethane, propane, butane and pentane as higher hydrocarbons,
• means to cool the feed natural gas (NG) to a first temperature level in a first cooling step using a first mixed refrigerant (WMR),
• after the first cooling step, means to subject the feed natural gas (NG), at least in part, to counter-current absorption using an absorption liquid, in which counter-current absorption a gas fraction depleted in the higher hydrocarbons is formed,
• means to cool a part of the gas fraction formed in the counter-current absorption to a second temperature level in a second cooling step using a second mixed refrigerant (CMR) and liquefying the part of the gas fraction formed in the counter-current absorption to form the liquefied natural gas (LNG),
• means for condensing another part of the gas fraction formed in the counter-current absorption to form the absorption liquid and means to return the formed absorption liquid to the counter-current absorption,
• means for removing a sump product containing at least ethane, propane butane and pentane from the counter-current absorption,
• means to directly feed at least part of the sump product formed in the counter-current absorption to a means for a first fractionation wherein a sump product low in propane and containing butane and pentane, along with an overhead product, are formed from the at least part of the sump product formed in the counter-current absorption,
• means to subject the sump product formed in the first fractionation, at least in part, to a second fractionation, in which an overhead product low in propane and containing butane, along with a sump product, are formed, and
• means to add the overhead product formed in the second fractionation at least partially to the first mixed refrigerant and/or to the second mixed refrigerant (WMR, CMR).