Method and apparatus for producing food grade carbon dioxide

Details Method and apparatus for producing food grade carbon dioxide Method and apparatus for producing food grade carbon dioxide

1983-01-18

1984-07-17

Sever, Frank

Refrigeration

Processes

Circulating external gas

423437, 62 24, 62 31, F25J 302

Patent

active

044603959

ABSTRACT:
A method is disclosed of producing food grade carbon dioxide from an impure carbon dioxide source stream containing contaminants which may include light and heavy hydrocarbons (at least C.sub.1 to C.sub.3) and light sulfur compounds such as hydrogen sulfide and carbonyl sulfide as well as heavier sulfur constituents in the nature of mercaptans (RSH) and/or organic mono and disulfides (RSR and RSSR). Nitrogen, water and/or oxygen may also be present in varying amounts in the impure feed stream. The feed gas is first rectified with liquid carbon dioxide condensed from a part of the feed stream to remove heavy hydrocarbons and heavy sulfur compounds, then passed through an absorber to effect removal of the light sulfur compounds, next subjected to an oxidizing atmosphere capable of converting all of the C.sub.2 hydrocarbons and optionally a part of the methane to carbon oxides and water, chilled to condense the water in the remaining gas stream without formation of hydrates, liquefied for ease of handling and storage and finally stripped to remove residual contaminants such as methane, carbon monoxide and nitrogen to produce the final food grade carbon dioxide product.

REFERENCES:
patent: 2548498 (1951-04-01), Russell et al.
patent: 3643451 (1972-02-01), Foucar

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