TEALARC LNG liquefaction

A simplified Technip TEALARC train: two closed mixed-refrigerant loops — a heavy C1/C2/C3 precool MR that also cools itself in a 4-stream exchanger, and a light N2/C1/C2/C3 liquefaction MR — bring natural gas to 120 K before letdown to storage (LNG at ~115 K). Both circulations are set via tear_specs; the precool MR runs rich for pinch feasibility (screening fidelity). From the ChemSep casebook (TEALARC).