Method for recovering 1,4-butanediol

Details Method for recovering 1,4-butanediol Method for recovering 1,4-butanediol

1993-12-09

1995-03-14

Manoharan, Virginia

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 71, 203 99, 203DIG19, 568913, 568914, B01D 334

Patent

active

053974395

ABSTRACT:
A method for recovering 1,4-butanediol from a hydrolysate obtained by hydrolyzing diacetoxybutane, by (1) supplying the hydrolysate to a first distillation column, distilling off substantially all the amounts of water and acetic acid as the top stream from the first distillation column, and supplying a bottom liquid to a second distillation column, (2) distilling off diacetoxybutane and hydroxyacetoxybutane as the top or upper side stream from of the second distillation column, and circulating the distillates to a hydrolysis zone, while withdrawing crude 1,4-butanediol as a lower side stream in vapor phase from the second distillation column, (3) supplying the crude 1,4-butanediol and hydrogen gas to a hydrogenation reaction zone packed with a hydrogenation catalyst, and (4) supplying the hydrogenation reaction product to a third distillation column, distilling off low boiling point components and withdrawing 1,4-butanediol as the bottom or side stream from the third distillation column.

REFERENCES:
patent: 4010197 (1977-03-01), Toriya et al.
patent: 4200501 (1980-04-01), Panek et al.
CA 1037487 Abstract UP AB 93090, Aug. 29, 1978.
CA 112(12):101187C, Klaus Peter et al.

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