Method for separating C5-C8 hydrocarbons and acid gases from a fluid stream

A process for removing C5-C8-hydrocarbons and acid gases from a fluid stream, the process comprising:

• a) contacting the fluid stream with an absorption medium comprising at least one amine in an absorption zone to obtain a deacidified fluid stream and an acid-gases-laden absorption medium;
• b) heating the laden absorption medium in a first heat exchanger and decompressing the heated laden absorption medium into a decompression zone to a pressure of from 5 to 10 bar to obtain a C5-C8-hydrocarbons-comprising gas phase and a hydrocarbon-depleted laden absorption medium;
• c) passing the hydrocarbon-depleted laden absorption medium into a stripper in which at a pressure of 1 to 2.5 bar the acid gases are at least partially liberated by supplying heat to obtain a regenerated absorption medium and an acid-gas-comprising stream, the hydrocarbon-depleted laden absorption medium being heated in a second heat exchanger before being introduced into the stripper;
• and
• d) recycling the regenerated absorption medium into the absorption zone,
• wherein:
• before the heating in the second heat exchanger the hydrocarbon-depleted laden absorption medium is decompressed into a desorption zone to a pressure of 1 to 2.5 bar and preheated by direct heat exchange with the acid-gas-comprising stream,
• the heating medium used in the second heat exchanger is the regenerated absorption medium and the heating medium used in the first heat exchanger is the regenerated absorption medium after it has passed through the second heat exchanger;
• and
• the amount of heat transferred in the first heat exchanger is such that the C5-C8-hydrocarbons-comprising gas phase comprises 50% to 97% by volume of acid gases.