Removal of basic nitrogen compounds from organic streams
AssigneeExxon Research & Engineering Co.
InventorZeinab Baset
Life of this patent
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Abstract
Basic nitrogen compounds are removed from organic streams containing at least a stoichiometric amount of water but not so much water that would cause a two phase liquid system. The stream is contacted with the gaseous sulfur dioxide, thereby precipitating a salt comprising the basic nitrogen compound, sulfur dioxide, and water and thereafter separating the precipitated salt from the contacted stream. The basic nitrogen compounds and the sulfur dioxide can then be regenerated from the salt.
Claims5
A method for separating basic nitrogen compounds from an organic feed stream selected from the group consisting of coal liquids, oil-shale liquids, petroleum oils, and coal bottoms which are soluble in common organic solvents at temperatures from about 20.degree. C. to about 100.degree. C., wherein said stream contains at least a stoichiometric amount of water but not so much water that would cause two liquid phases, the method comprising:
- (a) contacting said stream, at a temperature from about 20.degree. C. to about 100.degree. C. at about atmospheric pressure, with at least one mol of gaseous sulfur dioxide per mol of basic nitrogen compound in an organic stream, thereby precipitating a salt comprising the basic nitrogen compounds, sulfur dioxide and water;
- and
- (b) separating the precipitated salt from the contacted stream.
Dependencies are inferred from the claim text.