Method for coproducing isobutene and ETBE from tert-Butanol mixture
AssigneeCPC Corporation, Taiwan
InventorsWei-Bin Su, Karl Tze-Tang Chuang, Chung-Chen Lai, Yung-Sheng Ho
Life of this patent
Estimating the term…
Abstract
This invention describes a method for co-producing isobutene and ethyl tert-butyl ether from tert-butanol mixture in a catalytic distillation column, wherein catalyzing the tert-butanol mixture with the ethanol undergoes dehydration and etherification. The tert-butanol mixture contains absolute ethanol or aqueous ethanol as the antifreeze agent. The isobutene and the ethyl tert-butyl ether withdrawn from the column top are further separated, thus high purity isobutene and ethyl tert-butyl ether for fuel-additive are obtained.
Claims18
A method for coproducing isobutene and ethyl tert-butyl ether (ETBE) from tert-butanol (TBA) mixture, wherein said method comprising steps:
- providing a catalytic distillation column, the first catalytic distillation column is distinguished into a rectification zone, a catalytic zone, and a stripping zone from the top down;
- feeding TBA mixture into the rectification zone of the first catalytic distillation column, wherein the TBA mixture including TBA and absolute ethanol or aqueous ethanol;
- feeding ethanol into the stripping zone of the first catalytic distillation column to make the total ethanol-to-TBA molar ratio of the first catalytic distillation column is 0.1-2.0;
- and
- catalyzing the TBA mixture and the ethanol in the catalytic zone of the first catalytic distillation column to make the dehydration of the TBA of the TBA mixture and the etherification of the TBA with ethanol occur simultaneously, and isobutene and ETBE so that co-produced,
- wherein the concentration of the absolute ethanol or the aqueous ethanol in the TBA mixture is 2-30 wt %, and
- wherein the concentration of ethanol in the aqueous ethanol is more than 80 wt %.
Dependencies are inferred from the claim text.