Purge To Intermediate Pressure In Cryogenic Distillation

摘要

A system and method for an intermediate pressure vessel to receive a purge in a cryogenic distillation column system. The vessel operates at an intermediate pressure to reduce solidification of the purge. The cryogenic distillation column receives a natural gas having methane and acid gas. The column discharges an overhead stream rich in the methane, and a bottoms stream rich in the acid gas. An overhead system receives the overhead stream, and discharges a vapor methane product, and a cooled liquid for reflux to the cryogenic distillation column.

主权项

1. A cryogenic distillation column system comprising:
a cryogenic distillation column configured to receive a natural gas comprising methane and acid gas, and to discharge:
an overhead stream rich in the methane; anda bottoms stream rich in the acid gas; an overhead system configured to receive the overhead stream, and to discharge:
a vapor methane product;a cooled liquid for reflux to the cryogenic distillation column; and an intermediate pressure vessel configured to receive a purge and operate at an intermediate pressure to reduce solidification of the purge.