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https://www.peiyangchem.com/modular-gas-processing/heavy-hydrocarbon-removal.html

HEAVY HYDROCARBON REMOVAL UNIT
HRU – Heavies Removal Unit
Heavies Removal Unit (HRU) is used to remove C3+ hydrocarbons from feed gas. The operation of a HRU is based on the deep refrigeration provided by vapor ethylene to produce reflux to NGL recovery columns.

The process includes direct heat exchange process, NGL/LNG integrating process, and freezing process. HRU can be operated with or without liquefaction unit.

HSU -- Heavies Separation Unit
Heavies Separation Unit (HSU) is installed in conjunction with HRU. Once NGL has been removed from the natural gas stream, it must be fractioned into base components, which can be sold as C3 LPG and C4+ hydrocarbons products.
3D Model of HRU

PCC was established in 1993, and it’s a state owned company by Tianjin University which is ranking No.1 in chemical oil refinery engineering in China. PCC has a factory size of 145,064m2 and currently employs more than 350 people with various responsibilities in design and R&D, project management, engineering, procurement, and construction