Acetic Acid → Phthalic Acid

HRID 39440

Reaction equation

[C:1]1(=[O:11])[O:6][C:4](=[O:5])[C:3]2=[CH:7][CH:8]=[CH:9][CH:10]=[C:2]12.CC1C=CC=CC=1C.C(O)(=[O:22])C>>[C:1]([OH:6])(=[O:11])[C:2]1[C:3](=[CH:7][CH:8]=[CH:9][CH:10]=1)[C:4]([OH:22])=[O:5].[C:1]1(=[O:11])[O:6][C:4](=[O:5])[C:3]2=[CH:7][CH:8]=[CH:9][CH:10]=[C:2]12

Participants

Reactant 3

HCID 176Acetic Acid

HCID 6811Phthalic Anhydride

HCID 7237O-Xylene

Product 2

HCID 1017Phthalic Acid

HCID 6811Phthalic Anhydride

Procedure

As an example, reference is made to the production of phthalic anhydride with acetic acid as solvent. During oxidation of o-xylene as feedstock, phthalic acid and phthalic anhydride are obtained as products in the liquid-phase reactor. Therefore, not only the binary crystallization curves of phthalic acid in acetic acid or phthalic anhydride in acetic acid are used, but also those of the ternary system phthalic acid/phthalic anhydride/in acetic acid. By using the process of the invention, phthalic acid and phthalic anhydride are obtained as pure solid products. The acetic acid obtained as byproduct is recirculated into the reactor as solvent.

Sources & evidence

ORD record: ord-98b5a59ed8fd4b229550e2884de4185c
Source dataset: uspto-grants-2013_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08524922B2

Linked notes

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