Method for contemporaneously dimerizing and hydrating a feed having butene
Methods for producing alcohols and oligomers contemporaneously from a hydrocarbon feed containing mixed butenes using an acid based catalyst are provided. Additionally, methods for producing fuel compositions having alcohols and oligomers prepared from mixed olefins are also provided as embodiments of the present invention. In certain embodiments, the catalyst can include a dual phase catalyst system that includes a water soluble acid catalyst and a solid acid catalyst.
1. A method for simultaneously dimerizing and hydrating a hydrocarbon feed comprising mixed butenes, the method comprising the steps of:
introducing the hydrocarbon feed into a reaction zone in the presence of water and a dual phase catalyst system under reaction conditions that are operable to oligomerize and hydrate the butenes within the hydrocarbon feed to form a product stream comprising mixed butanols and DIB.
2. The method as claimed in claim 1 , wherein the hydrocarbon feed comprises isobutene.
3. The method as claimed in claim 1 , wherein the hydrocarbon feed comprises at least 5% by weight isobutene.
4. The method as claimed in claim 1 , wherein the dual phase catalyst system comprises a water soluble acid.
5. The method as claimed in claim 1 , wherein the dual phase catalyst system comprises a water insoluble acid.
6. The method as claimed in claim 1 , wherein the reaction zone comprises two or more reaction stages.
7. The method as claimed in claim 1 , further comprising the step of removing the DIB and butanol from the product stream, such that the reaction equilibrium shifts to favor the forward reaction.
8. The method as claimed in claim 1 , further comprising the step of combining the product stream with a gasoline stream to produce a gasoline product having an increased research octane number and reduced Reid vapor pressure as compared to a second gasoline product having an absence of the product stream.
9. The method as claimed in claim 1 , wherein the dual phase catalyst system comprises a water soluble acid catalyst and a water insoluble acid catalyst.
10. The method as claimed in claim 9 , wherein the water soluble acid catalyst is an organic acid selected from acetal acid, tosylate acid and perflurated acetic acid.
11. The method as claimed in claim 9 , wherein the water soluble acid catalyst is an inorganic acid selected from HCl, H 3 PO 4 , and H 2 SO 4 .
12. The method as claimed in claim 9 , wherein the water insoluble acid catalyst is selected from ion exchange resin, zeolite, and a supported acid.