公开(公告)号：US20230400251A1

公开(公告)日：2023-12-14

申请号：US18252666

申请日：2021-11-03

Applicant: SAIPEM S.P.A.

Inventor： Fabrizio MELONI ,  Chiara LOZIO ,  Anton Marco FANTOLINI

IPC: F25J1/02 ,  F25J1/00

CPC classification number: F25J1/0208 ,  F25J1/0072 ,  F25J1/0052 ,  F25J1/0022 ,  F25J1/0275 ,  F25J2210/60 ,  F25J2220/60 ,  F25J2240/02 ,  F25J2270/12 ,  F25J2290/20

Abstract: A process for liquefying and simultaneously purifying natural gas from acidic compounds is provided. The process involves pre-cooling a natural gas flow in a cryogenic exchanger, pre-treating the pre-cooled natural gas flow inside a pre-treatment unit and obtaining a purified flow, heat recovering and obtaining a higher temperature flow, compressing the higher temperature flow and obtaining a first compressed recirculation flow, cooling the first compressed recirculation flow and obtaining a compressed and cooled flow, and separating from the compressed and cooled flow a recirculation flow portion of natural gas. One or more cooling steps are carried out by a flow of nitrogen circulating inside a closed nitrogen refrigeration cycle.