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Title: Method and apparatus for producing food grade carbon dioxide

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.

Inventors:
;
Publication Date:
OSTI Identifier:
6212506
Patent Number(s):
US 4460395
Assignee:
The Pritchard Corporation
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 18 Jan 1983; Other Information: PAT-APPL-458845
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CARBON DIOXIDE; CHEMICAL PREPARATION; FOOD PROCESSING; DESULFURIZATION; DISULFIDES; DRYING; FRACTIONATION; HYDROCARBONS; HYDROGEN SULFIDES; OXIDATION; THIOLS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; HYDROGEN COMPOUNDS; ORGANIC COMPOUNDS; ORGANIC SULFUR COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PROCESSING; SEPARATION PROCESSES; SULFIDES; SULFUR COMPOUNDS; SYNTHESIS; 400201* - Chemical & Physicochemical Properties

Citation Formats

Nobles, J E, and Swenson, L K. Method and apparatus for producing food grade carbon dioxide. United States: N. p., 1984. Web.
Nobles, J E, & Swenson, L K. Method and apparatus for producing food grade carbon dioxide. United States.
Nobles, J E, and Swenson, L K. Tue . "Method and apparatus for producing food grade carbon dioxide". United States.
@article{osti_6212506,
title = {Method and apparatus for producing food grade carbon dioxide},
author = {Nobles, J E and Swenson, L K},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {7}
}