Gas-liquid mixed-phase light-hydrocarbon separation method and process system for LNG receiving terminals

The gas-liquid miscible light hydrocarbon separation process system at the LNG receiving terminal utilizes the cold energy of LNG to liquefy lean natural gas and the heat of the raw natural gas to gasify it, solving the problems of insufficient utilization of LNG cold energy and high energy consumption for external transmission, thereby improving the light hydrocarbon recovery rate and reducing energy consumption.

WO2026123873A1PCT designated stage Publication Date: 2026-06-18CHINA PETROLEUM ENG & CONSTR +1
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
CHINA PETROLEUM ENG & CONSTR
Filing Date
2025-09-18
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

The existing light hydrocarbon separation process in LNG receiving terminals cannot fully utilize the cold energy of LNG, and the high energy consumption of pressurizing natural gas for export leads to low light hydrocarbon recovery rate and excessive energy consumption.

⚗Method used

An LNG receiving terminal gas-liquid mixed-phase light hydrocarbon separation process system is adopted, which utilizes the cold energy of LNG to subcool and liquefy lean natural gas, and combines the heat of the feedstock natural gas to gasify lean natural gas. Through multi-stage heat exchange and booster pump combination, energy consumption is reduced and light hydrocarbon recovery rate is improved.

🎯Benefits of technology

By utilizing the cold energy of LNG and the heat energy of the raw natural gas, the energy consumption of the light hydrocarbon separation process is reduced, the light hydrocarbon recovery rate is improved, and the pressurization energy consumption of the exported natural gas is reduced.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to the technical field of the cryogenic separation of light hydrocarbons. Provided are a gas-liquid mixed-phase light-hydrocarbon separation method and process system for LNG receiving terminals. The light-hydrocarbon separation process system comprises: a first heat exchanger; a second heat exchanger; a demethanizer, raw natural gas being connected to a first inlet of the demethanizer via the first heat exchanger, and raw LNG being connected to a second inlet of the demethanizer via the second heat exchanger and the first heat exchanger in sequence; a heating assembly, a gas outlet of the demethanizer being connected to an inlet of the heating assembly via the first heat exchanger, the second heat exchanger and the first heat exchanger in sequence; a deethanizer, a liquid outlet of the demethanizer being connected to a first inlet of the deethanizer; and a third heat exchanger, a gas outlet and a liquid outlet of the deethanizer being respectively connected to inlets on two sides of the third heat exchanger. The light-hydrocarbon separation process system provided in the present application can improve the recovery rate of light hydrocarbons and reduce the energy consumption of a light-hydrocarbon separation process; moreover, the process system can vaporize LNG and reduce the energy consumption of LNG vaporization during send-out from LNG receiving terminals.
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