Maleic Anhydride → Dimethyl maleate

HRID 1160802Notes

Reaction equation

HRID 1160802 reaction equation
[C:1]1(=O)OC(=O)C=C1.C(O)(=O)/C=C\C(O)=O.[C:16]([O:23][CH3:24])(=[O:22])/[CH:17]=[CH:18]\[C:19]([O-:21])=[O:20]>CO>[C:19]([O:21][CH3:1])(=[O:20])/[CH:18]=[CH:17]\[C:16]([O:23][CH3:24])=[O:22]

Participants

5

Reactant 3

HCID 7923Maleic Anhydride2×HCID 444266Maleic AcidHCID 21768182Mono-methyl maleate

Product 1

HCID 5271565Dimethyl maleate

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent2×

Procedure

A butane oxidation reactor produces 100 moles per hour of maleic anhydride, of which 40 kmols are condensed by cooling the gases in condensers. The remaining 60 moles per hour are recovered as a 50 wt % aqueous solution of maleic acid from an absorber. This is fed to an evaporation system to concentrate the solution of maleic acid. The concentrated solution is fed to a dehydration reactor system to produce a stream of crude maleic anhydride. This maleic anhydride, together with the crude maleic anhydride from the partial condensers is fed to an esterification unit. The crude maleic acid is mixed with recycle methanol from the refining section and fed to a plug flow, mono-ester reactor. The product from this is fed to a reaction column to react the mono-methyl maleate with methanol to produce di-methyl maleate. 300 mols per hour of methanol are fed to the bottom of the reaction column. Essentially dry, fully converted di-methyl maleate is fed to hydrogenation. Recycle methanol from the refining section is fed to the top of the reaction column as washed to minimise the di-methyl maleate in the overhead of the column.

Workup

  1. customThe product from this is fed to a reaction column

Sources & evidence

ORD record
ord-5573d6696fd94122a3909515ac109108
Source dataset
uspto-grants-2010_10
Patent number
US07816554B2

Reaction notes

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