Patent ID: 7384541

Claim:
Hydrotreatment method comprising the following steps: reacting a feedstock comprising hydrocarbons with hydrogen in a reaction section to obtain an effluent comprising reaction products at a pressure P 1 between 5 and 20 MPa, separating the effluent into a fluid phase comprising gas and a fluid phase comprising liguid, expanding the fluid phase comprising liquid by a single-phase turbine to obtain a fluid with a gas volume ratio less than or equal to 5% and having a pressure P 2 lower than the pressure P 1 , expanding the fluid having the gas volume ratio less than or equal to 5% and having the pressure P 2 by a two-phase turbine to obtain a fluid with a pressure P 3 between 0.5 and 1.5 MPa, and sending the fluid having the pressure P 3 to a fractionation section for fractionation of the reaction products.