Methacrylic Acid → Carbon Dioxide

HRID 1448618Notes

Reaction equation

[C:1]([OH:6])(=[O:5])[C:2]([CH3:4])=[CH2:3].[OH-].[Ca+2:8].[OH-]>>[C:1]([O-:6])(=[O:5])[C:2]([CH3:4])=[CH2:3].[Ca+2:8].[C:1]([O-:6])(=[O:5])[C:2]([CH3:4])=[CH2:3].[C:1](=[O:6])=[O:5]

Participants

Reactant 2

HCID 4093Methacrylic Acid

HCID 6093208Calcium Hydroxide

Product 2

HCID 280Carbon Dioxide

HCID 22325372Calcium bis(2-methylprop-2-enoate)

Procedure

U.S. Pat. No. 3,839,437, describes a process of preparing methacrylic acid by employing calcium hydroxide to form the metal salt of the acid, calcium methacrylate, and neutralization with CO2 at low pressure to give the acid and the insoluble calcium carbonate in the presence of a water immiscible organic solvent, such as an ether, to extract the methacrylic acid from the aqueous phase. Continuous passage of carbon dioxide with ether extraction gave only 10.6 and 41.3 percent methacrylic acid recovery in 1 and 4 hours respectively.

Sources & evidence

ORD record: ord-946a8c082317478d8732ac2e18694db5
Source dataset: uspto-grants-1979_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04180681

Reaction notes

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