Benzene → Dimethyl Phthalate

HRID 720799

Reaktionsgleichung

Reaktionsgleichung von HRID 720799
[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.S(=O)(=O)(O)O.Cl.S([O:23][CH3:24])(OC)(=O)=O.[CH:25]1C=CC=CC=1>CO>[C:4]([O:23][CH3:24])(=[O:5])[C:3]1[C:2](=[CH:10][CH:9]=[CH:8][CH:7]=1)[C:1]([O:6][CH3:25])=[O:11]

Komponenten

7

Edukt 5

HCID 241BenzeneHCID 313Hydrochloric AcidHCID 1118Sulfuric AcidHCID 6497Dimethyl SulfateHCID 6811Phthalic Anhydride2×

Produkt 1

HCID 8554Dimethyl Phthalate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 887MethanolLösungsmittel

Versuchsvorschrift

The present invention provides a method of producing dimethyl phthalate from naphthalene based chemicals, particularly, phthalic anhydride, which is a coal tar by product, by treating phthalic anhydride with methanol, adding a catalyst, such as sulphuric acid, hydrochloric acid or mixture thereof and a promoter, such as, dimethyl sulphate. Refluxing the resultant mixture at a temperature in the range of 60 to 100 degree Celsius, for a time period in the range of 6 to 12 hours, in presence of benzene. Separating the distillate into two layers. Removing the aqueous layer and sending back the benzene layer to the reaction vessel. Recovering unreacted methanol by distillation. Neutralizing the residue with caustic soda followed by extraction with benzene. Distilling the extract under vacuum to obtain benzene, and continuing the distillation process at a temperature in the range of 145 to 146 degree Celsius under 10 mm of mercury to obtain dimethyl phthalate.

Aufarbeitung

  1. additionadding a catalyst
  2. customin the range of 6 to 12 hours
  3. customSeparating the distillate into two layers
  4. customRemoving the aqueous layer
  5. customRecovering unreacted methanol
  6. distillationby distillation
  7. extractionNeutralizing the residue with caustic soda followed by extraction with benzene
  8. distillationDistilling the
  9. extractionextract under vacuum
  10. customto obtain benzene
  11. customin the range of 145 to 146 degree Celsius

Quellen und Nachweise

ORD-Eintrag
ord-4726c9d1a6fb48e39dcf833c92f046fa
Quelldatensatz
uspto-grants-2006_11
Patentnummer
US07135588B2

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