METHOD FOR LOW-TEMPERATURE TREATMENT OF NATURAL GAS WITH POWER GENERATION Russian patent published in 2022 - IPC F25J3/00 

FIELD: natural gas.

SUBSTANCE: invention relates to the field preparation of natural gas for transport through the main gas pipeline. The initial mixture, consisting of natural gas and liquid hydrocarbons, is subjected to primary separation with the formation of primary separation gas and primary separation liquid phase, which is degassed to obtain primary degassing liquid phase and primary degassing gas. The primary separation gas is cooled and subjected to secondary separation to form a secondary separation liquid phase and a secondary separation gas, which is expanded with a decrease in temperature to -35°С…-45°С and power generation, after which primary degassing gas and a secondary separation liquid phase are added to it. The resulting mixture is subjected to low-temperature separation, which results in a liquid phase of low-temperature separation and a gas, which is heated and sent to the consumer. The liquid phases of the primary and low-temperature separation are mixed and sent to the condensate preparation unit with the formation of a gas phase and hydrocarbon condensate, which is sent to the consumer.

EFFECT: increasing the degree of extraction of ethane and propane-butanes in the composition of marketable liquid products and reducing energy costs.

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