Processes for converting gaseous alkanes to liquid hydrocarbons
AssigneeMarathon Gtf Technology, Ltd.
InventorsJohn J. Waycuilis, William J. Turner
Life of this patent
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Abstract
A process for converting gaseous alkanes to olefins, higher molecular weight hydrocarbons or mixtures thereof 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 is then reacted over a suitable catalyst at a temperature sufficient to form olefins, higher molecular weight hydrocarbons or mixtures thereof and hydrobromic acid vapor. Various methods are disclosed to remove the hydrobromic acid vapor from the higher molecular weight hydrocarbons, to generate bromine from the hydrobromic acid for use in the process, and to selectively form monobrominated alkanes in the bromination step.
Claims63
A process comprising:
- contacting bromine with gaseous alkanes at a methane to bromine molar ratio of at least about 2.5:1 to form bromination products comprising alkyl bromides;
- and
- reacting said alkyl bromides with C2+ hydrocarbons in the presence of a catalyst to convert at least a portion of dibrominated alkanes and tribrominated alkanes present in said alkyl bromides to monobrominated alkanes.
The process comprising:
- removing C2+ alkanes from lower molecular weight alkanes to obtain a feed gas comprising as least about 90 mol % methane;
- reacting said feed gas with bromine at a methane to bromine molar ratio of at least about 2.5:1 to form bromination products comprising alkyl bromides;
- and
- reacting said alkyl bromides with C2+ hydrocarbons in the presence of a catalyst to convert at least a portion of dibrominated alkanes and tribrominated alkanes present in said alkyl bromides to monobrominated alkanes.
A process comprising:
- reacting bromine with gaseous alkanes in a first reactor and at a residence time of less than about 5 seconds to form bromination products comprising alkyl bromides;
- and
- reacting said alkyl bromides with C2+ hydrocarbons in a second reactor and in the presence of a catalyst to convert at least a portion of dibrominated alkanes and tribrominated alkanes present in said alkyl bromides to monobrominated alkanes.
A process comprising:
- removing lower molecular weight alkanes comprising at least 90 mol % methane from a hydrocarbon product;
- contacting said lower molecular weight alkanes with bromine at a methane to bromine molar ratio of at least about 2.5:1 to form bromination products comprising alkyl bromides;
- reacting said alkyl bromides with C2+ hydrocarbons in the presence of a first catalyst to convert at least a portion of dibrominated alkanes and tribrominated alkanes present in said alkyl bromides to monobrominated alkanes;
- and
- reacting said alkyl bromides after reaction with said C2+ hydrocarbons in the presence of a second catalyst to form said hydrocarbon product.
Dependencies are inferred from the claim text.