Maleic Anhydride → Gamma-Butyrolactone

HRID 650696Notes

Reaction equation

HRID 650696 reaction equation
[C:1]1(=[O:7])[O:6][C:4](=[O:5])[CH:3]=[CH:2]1>O1CCCC1>[CH2:1]([OH:6])[CH2:2][CH2:3][CH2:4][OH:5].[C:4]1(=[O:5])[O:6][CH2:1][CH2:2][CH2:3]1.[C:4]1(=[O:5])[O:6][C:1](=[O:7])[CH:2]=[CH:3]1

Participants

5

Reactant 1

HCID 7923Maleic Anhydride

Product 3

HCID 7302Gamma-ButyrolactoneHCID 7923Maleic AnhydrideHCID 80641,4-Butanediol

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

Butane-1,4-diol, gamma-butyrolactone or tetrahydrofuran are prepared by vapor phase hydrogenation of a C4-dicarboxylic acid derivative. A maleic anhydride containing vapor stream is contacted in an absorption zone with a first high boiling solvent. A waste gas stream is passed to a scrubbing zone containing a second, higher boiling solvent. The waste gas is purged and the first and second solvents are recovered and recycled. Maleic anhydride is obtained from the absorption zone and converted to a maleic acid diester, which is stripped from the first solvent with hydrogen. The desired products are obtained by hydrogenation.

Workup

  1. additioncontaining a second, higher boiling solvent
  2. customThe waste gas is purged
  3. customthe first and second solvents are recovered

Sources & evidence

ORD record
ord-ce7ecb5ff1d3434c811ac55e52509588
Source dataset
uspto-grants-2001_08
Patent number
US06274743B1

Reaction notes

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