Process for converting gaseous alkanes to olefins and liquid hydrocarbons
AssigneeMarathon Gtf Technology, Ltd.
InventorJohn J. Waycuilis
Life of this patent
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Abstract
A process for converting gaseous alkanes to olefins and higher molecular weight hydrocarbons wherein a gaseous feed containing alkanes is reacted with a dry bromine vapor to form alkyl bromides and hydrobromic acid vapor. The mixture of alkyl bromides and hydrobromic acid are then reacted over a synthetic crystalline alumino-silicate catalyst, such as an X or Y type zeolite, at a temperature of from about 250° C. to about 500° C. so as to form olefins, higher molecular weight hydrocarbons and hydrobromic acid vapor. Various methods are disclosed to remove the hydrobromic acid vapor from the olefins and higher molecular weight hydrocarbons and to generate bromine from the hydrobromic acid for use in the process.
Claims33
A process comprising:
- reacting a gaseous feed having lower molecular weight alkanes with bromine vapor to form alkyl bromides and hydrobromic acid;
- reacting said alkyl bromides in the presence of said hydrobromic acid and a synthetic crystalline alumino-silicate catalyst and at a temperature sufficient to form olefins and additional hydrobromic acid;
- and
- contacting said hydrobromic acid, said additional hydrobromic acid, and said olefins with water to remove said hydrobromic acid and said additional hydrobromic acid from said olefins.
A process comprising:
- reacting alkyl bromides in the presence of a synthetic crystalline alumino-silicate catalyst and at a temperature sufficient to form at least olefins and hydrobromic acid;
- removing said hydrobromic acid from said olefins;
- converting said hydrobromic acid to bromine;
- and
- storing at least a portion of said bromine by contacting a metal bromide in a reduced valence state with said at least a portion of said bromine to form a metal bromide in an oxidized valence state.
A process comprising:
- reacting a gaseous feed having lower molecular weight alkanes with bromine in a first reactor to form alkyl bromides and hydrobromic acid;
- reacting said alkyl bromides in the presence of said hydrobromic acid and a synthetic crystalline alumino-silicate catalyst in a second reactor and at a temperature sufficient to form olefins and additional hydrobromic acid;
- and
- removing said hydrobromic acid and said additional hydrobromic acid from said olefins by reacting said hydrobromic acid and said additional hydrobromic acid with a metal oxide in a vessel to form at least a metal bromide.
Dependencies are inferred from the claim text.