Method and apparatus for purification of high CO.sub.2 content g

Details Method and apparatus for purification of high CO.sub.2 content g Method and apparatus for purification of high CO.sub.2 content g

1984-08-23

1986-01-07

Hart, Charles

Refrigeration

Processes

Circulating external gas

62 20, 62 28, 55 68, 55 73, F25J 304

Patent

active

045632022

ABSTRACT:
Disclosed is a method and apparatus for separating and purifying carbon dioxide and natural gas contained in the associated gas of an oil well. Feed containing hydrocarbons, carbon dioxide, water and hydrogen sulfide, is fed to a stabilizer column where heavy hydrocarbons and water are removed. Hydrogen sulfide is then stripped from the gas in a carbon dioxide fractionator using a solvent which absorbs H.sub.2 S and increases the relative volatility of carbon dioxide to hydrogen sulfide. Overhead from the CO.sub.2 fractionator contains carbon dioxide and light hydrocarbons, which are then separated in a demethanizer column which produces liquid carbon dioxide as a bottoms product. The invention is particularly useful in recovering carbon dioxide from the associated gas of oil produced from enhanced oil recovery processes using carbon dioxide injection.

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