Acetic Acid → Acrylic anhydride

HRID 1722613

Reaktionsgleichung

Reaktionsgleichung von HRID 1722613
[C:1]([OH:5])(=[O:4])[CH:2]=[CH2:3].C([O:9][C:10](=O)[CH3:11])(=O)C.[C:13](O)(=O)C>>[C:1]([O:5][C:10](=[O:9])[CH:11]=[CH2:13])(=[O:4])[CH:2]=[CH2:3]

Komponenten

4

Edukt 3

HCID 176Acetic AcidHCID 6581Acrylic AcidHCID 7918Acetic Anhydride

Produkt 1

HCID 74919Acrylic anhydrideAusbeute 75 %

Versuchsvorschrift

In this example, the mole ratio between acrylic acid and acetic anhydride is equal to 1.5. The reaction mixture is subjected to stirring and, throughout the reaction which lasts for 5 hours, the acetic acid is drawn off under a pressure of 100 mmHg, the temperature being 85° C. at the beginning of the reaction and 95° C. at the end of the reaction. In addition, during the reaction and during the distillation, 500 ppm of copper sulphate and 500 ppm of phenothiazine are gradually introduced into the top of the distillation column. After the reaction, distillation is performed. There are distilled, as a first fraction, unreacted acetic anhydride and acrylic acid, acrylic acetic mixed anhydride as well as a little acrylic anhydride, under 200 mmHg at a temperature of 57° to 76° C. under 20 mmHg. This fraction represents 140 parts by weight. The acrylic anhydride is then distilled at 76° C. under 20 mmHg. 250 parts by weight of acrylic anhydride are collected. The yield is 75%.

Aufarbeitung

  1. customthe temperature being 85° C. at the beginning of the reaction and 95° C. at the end of the reaction
  2. customIn addition, during the reaction
  3. distillationduring the distillation, 500 ppm of copper sulphate and 500 ppm of phenothiazine
  4. additionare gradually introduced into the top of the distillation column
  5. customAfter the reaction, distillation
  6. distillationThere are distilled, as a first fraction, unreacted acetic anhydride and acrylic acid, acrylic acetic
  7. additionmixed anhydride as well as a little acrylic anhydride
  8. customat a temperature of 57° to 76° C.
  9. distillationThe acrylic anhydride is then distilled at 76° C. under 20 mmHg
  10. custom250 parts by weight of acrylic anhydride are collected

Quellen und Nachweise

ORD-Eintrag
ord-5e0835ee18e445908cce1da93070340e
Quelldatensatz
uspto-grants-1989_08
Patentnummer
US04857239

Verknüpfte Notizen

Wird geladen…