Removing diamondoid components from natural gas at reduced...

Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By addition of extraneous agent – e.g. – solvent – etc.

Reexamination Certificate

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C585S867000

Reexamination Certificate

active

07442847

ABSTRACT:
A process for separating diamondoids and water from a gas stream that is being cooled to below atmospheric temperature is disclosed. The multi-component gas stream is contacted with a diamondoid solvent and a water solvent (glycol) simultaneously. The feed gas can be cooled to temperatures of at least −40° F. without formation of water-based or diamondoid solids. Downstream equipment is protected from large accumulations of diamondoid solids or liquids. The feed gas may be natural gas, coal seam gas, associated gas, or other naturally occurring gases. The rich solvent with diamonoids may be regenerated or simply recirculated with make-up of fresh solvent and a purge of rich solvent. The rich glycol and rich diamondoid solvent streams are each separated from the feed gas after cooling. The lean glycol and lean solvent can be mixed using static mixers in order to inject with a single set of nozzles.

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K.E. Woodcock & M. Gottlieb, Natural Gas in: Kirk-Othmer Encyclopedia of Chemical Technology (2004 ed.), vol. 12, 365-386.
A. S. Cullick et al. “An Analysis of Solid-Forming Characteristics from a Produced Gas Stream,”Proceedings of the Seventy-Third GPA Annual Convention, New Orleans, Louisiana Mar. 7-9, 1994, U.S.A., pp. 22-28.

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