Preparation of tetrahydrofuran
First Claim
1. A process for the preparation of tetrahydrofuran from an aqueous solution of butane-1,4-diol by eliminating water in the liquid phase at elevated temperatures, under superatmospheric pressure and in the presence of an acid, wherein a crude alkaline aqueous solution of butane-1,4-diol, obtained by reaction of acetylene with aqueous formaldehyde and catalytic hydrogenation of the resulting but-2-yne-1,4-diol solution, is, neutralized with sulfuric acid, and is then acidified by adding phosphoric acid and heated at from 200°
- to 260°
C. under superatmospheric pressure.
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Accused Products
Abstract
Tetrahydrofuran is prepared from a crude alkaline aqueous solution of butane-1,4-diol, as obtained by reaction of acetylene with aqueous formaldehyde and catylytic hydrogenation of the resulting but-2-yne-1,4-diol solution by a process in which the alkaline solution is first neutralized with sulfuric acid and water is then eliminated in the liquid phase at from 200° to 260° C., under superatmospheric pressure and in the presence of phosphoric acid.
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Citations
8 Claims
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1. A process for the preparation of tetrahydrofuran from an aqueous solution of butane-1,4-diol by eliminating water in the liquid phase at elevated temperatures, under superatmospheric pressure and in the presence of an acid, wherein a crude alkaline aqueous solution of butane-1,4-diol, obtained by reaction of acetylene with aqueous formaldehyde and catalytic hydrogenation of the resulting but-2-yne-1,4-diol solution, is, neutralized with sulfuric acid, and is then acidified by adding phosphoric acid and heated at from 200°
- to 260°
C. under superatmospheric pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- to 260°
Specification