Abstract:
Continuous processes are provided for the partial oxidation in the vapor phase over a heterogeneous catalyst in a reaction zone of hydrocarbyl reactant to produce carboxylic acids or anhydrides wherein at least a portion of unreacted hydrocarbyl reactant is returned via a cyclic loop to the reaction zone. The partial oxidation generates carbon oxides which are used as ballast gas in the cyclic loop. The carboxylic acids or anhydrides are removed from the cyclic loop by condensation. Purification of the products can be by stripping lights and then dehydrating the carboxylic acid or anhydride product removed from the cyclic loop.
Abstract:
The present invention provides methods for manufacturing olefins such as ethylene and propylene from lower alkanes, that is, methane, ethane and/or propane, by oxidative dehydrogenation at elevated pressure. The olefins are selectively recovered from unconverted lower alkane feed and reaction byproducts by using a complexation separation, such as an absorption separation that uses aqueous silver nitrate as the complexation agent. Catalysts are used that give high selectivity for oxidative dehydrogenation of lower alkanes to olefins at elevated pressure, such as a nonstoichiometric rare earth oxycarbonate catalyst.
Abstract:
THE PRESENT INVENTION PROVIDES METHOD FOR MANUFACTURING OLEFINS SUCH AS ETHYLENE AND PROPYLENE FROM LOWER ALKANES (5), THAT IS, METHANE, ETHANE AND/OR PROPANE, BY OXIDATIVE DEHYDROGENATION AT ELEVATED PRESSURE. THE OLEFINS ARE SELECTIVELY RECOVERED FROM UNCONVERTED LOWER ALKANE (10) FEED AND REACTION BYPRODUCTS BY USING A COMPLEXATION SEPARATION, SUCH AS AN ABSORPTION SEPARATION THAT USES AQUEOUS SILVER NITRATE AS THE COMPLEXATION AGENT. CATALYSTS ARE USED THAT GIVE HIGH SELECTIVITY FOR OXIDATIVE DEHYDROGENATION OF LOWER ALKANES (5) TO OLEFINS (8) AT ELEVATED PRESSURE, SUCH AS A NONSTOICHIOMETRIC RARE EARTH OXYCARBONATE CATALYST.
Abstract:
The present invention provides methods for manufacturing olefins such as ethylene and propylene from lower alkanes, that is, methane, ethane and/or propane, by oxidative dehydrogenation at elevated pressure. The olefins are selectively recovered from unconverted lower alkane feed and reaction byproducts by using a complexation separation, such as an absorption separation that uses aqueous silver nitrate as the complexation agent. Catalysts are used that give high selectivity for oxidative dehydrogenation of lower alkanes to olefins at elevated pressure, such as a nonstoichiometric rare earth oxycarbonate catalyst.
Abstract:
The present invention provides methods for manufacturing olefins such as ethylene and propylene from lower alkanes, that is, methane, ethane and/or propane, by oxidative dehydrogenation at elevated pressure. The olefins are selectively recovered from unconverted lower alkane feed and reaction byproducts by using a complexation separation, such as an absorption separation that uses aqueous silver nitrate as the complexation agent. Catalysts are used that give high selectivity for oxidative dehydrogenation of lower alkanes to olefins at elevated pressure, such as a nonstoichiometric rare earth oxycarbonate catalyst.
Abstract:
The present invention provides methods for manufacturing olefins such as ethylene and propylene from lower alkanes, that is, methane, ethane and/or propane, by oxidative dehydrogenation at elevated pressure. The olefins are selectively recovered from unconverted lower alkane feed and reaction byproducts by using a complexation separation, such as an absorption separation that uses aqueous silver nitrate as the complexation agent. Catalysts are used that give high selectivity for oxidative dehydrogenation of lower alkanes to olefins at elevated pressure, such as a nonstoichiometric rare earth oxycarbonate catalyst.
Abstract:
The present invention provides methods for manufacturing olefins such as ethylene and propylene from lower alkanes, that is, methane, ethane and/or propane, by oxidative dehydrogenation at elevated pressure. The olefins are selectively recovered from unconverted lower alkane feed and reaction byproducts by using a complexation separation, such as an absorption separation that uses aqueous silver nitrate as the complexation agent. Catalysts are used that give high selectivity for oxidative dehydrogenation of lower alkanes to olefins at elevated pressure, such as a nonstoichiometric rare earth oxycarbonate catalyst.
Abstract:
The present invention provides methods for manufacturing olefins such as ethylene and propylene from lower alkanes, that is, methane, ethane and/or propane, by oxidative dehydrogenation at elevated pressure. The olefins are selectively recovered from unconverted lower alkane feed and reaction byproducts by using a complexation separation, such as an absorption separation that uses aqueous silver nitrate as the complexation agent. Catalysts are used that give high selectivity for oxidative dehydrogenation of lower alkanes to olefins at elevated pressure, such as a nonstoichiometric rare earth oxycarbonate catalyst.